1 | /** |
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2 | * This software is copyright (c) 2011 by |
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3 | * - Institut fuer Deutsche Sprache (http://www.ids-mannheim.de) |
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4 | * This is free software. You can redistribute it |
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5 | * and/or modify it under the terms described in |
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6 | * the GNU General Public License v3 of which you |
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7 | * should have received a copy. Otherwise you can download |
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8 | * it from |
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9 | * |
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10 | * http://www.gnu.org/licenses/gpl-3.0.txt |
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11 | * |
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12 | * @copyright Institut fuer Deutsche Sprache (http://www.ids-mannheim.de) |
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13 | * |
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14 | * @license http://www.gnu.org/licenses/gpl-3.0.txt |
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15 | * GNU General Public License v3 |
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16 | */ |
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17 | package eu.clarin.sru.client; |
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18 | |
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19 | import java.io.ByteArrayInputStream; |
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20 | import java.io.IOException; |
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21 | import java.io.InputStream; |
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22 | import java.net.URI; |
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23 | import java.net.UnknownHostException; |
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24 | import java.util.ArrayList; |
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25 | import java.util.HashMap; |
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26 | import java.util.List; |
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27 | import java.util.Map; |
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28 | import java.util.concurrent.TimeUnit; |
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29 | |
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30 | import javax.xml.stream.XMLStreamException; |
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31 | import javax.xml.stream.XMLStreamReader; |
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32 | |
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33 | import org.apache.commons.lang.NullArgumentException; |
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34 | import org.apache.http.HttpEntity; |
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35 | import org.apache.http.HttpResponse; |
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36 | import org.apache.http.HttpStatus; |
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37 | import org.apache.http.StatusLine; |
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38 | import org.apache.http.client.ClientProtocolException; |
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39 | import org.apache.http.client.HttpClient; |
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40 | import org.apache.http.client.methods.HttpGet; |
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41 | import org.apache.http.impl.client.DefaultHttpClient; |
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42 | import org.apache.http.params.CoreProtocolPNames; |
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43 | import org.apache.http.util.EntityUtils; |
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44 | import org.slf4j.Logger; |
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45 | import org.slf4j.LoggerFactory; |
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46 | |
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47 | import eu.clarin.sru.client.SRUScanHandler.WhereInList; |
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48 | |
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49 | /** |
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50 | * A class to perform SRU operations. |
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51 | * <p>This class is <em>not</em> thread-safe!</p> |
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52 | */ |
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53 | public class SRUClient { |
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54 | /** constant record data schema parser to match any schema */ |
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55 | public static final String RECORD_DATA_PARSER_SCHEMA_ANY = "*"; |
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56 | /** default version the client will use, if not otherwise specified */ |
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57 | public static final SRUVersion DEFAULT_SRU_VERSION = SRUVersion.VERSION_1_2; |
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58 | private static final String SRU_NS = |
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59 | "http://www.loc.gov/zing/srw/"; |
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60 | private static final String SRU_DIAGNOSIC_NS = |
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61 | "http://www.loc.gov/zing/srw/diagnostic/"; |
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62 | private static final String SRU_DIAGNOSTIC_RECORD_SCHEMA = |
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63 | "info:srw/schema/1/diagnostics-v1.1"; |
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64 | private static final String VERSION_1_1 = "1.1"; |
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65 | private static final String VERSION_1_2 = "1.2"; |
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66 | private static final String RECORD_PACKING_XML = "xml"; |
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67 | private static final String RECORD_PACKING_STRING = "string"; |
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68 | private static final Logger logger = |
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69 | LoggerFactory.getLogger(SRUClient.class); |
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70 | private final SRUVersion defaultVersion; |
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71 | private final HttpClient httpClient; |
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72 | private final Map<String, SRURecordDataParser> parsers = |
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73 | new HashMap<String, SRURecordDataParser>(); |
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74 | private final XmlStreamReaderProxy proxy = new XmlStreamReaderProxy(); |
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75 | private boolean strictMode; |
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76 | |
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77 | |
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78 | /** |
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79 | * Constructor. This constructor will create a <em>strict</em> client and |
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80 | * use the default SRU version. |
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81 | * |
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82 | * @see #SRUClient(SRUVersion, boolean) |
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83 | * @see #DEFAULT_SRU_VERSION |
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84 | */ |
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85 | public SRUClient() { |
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86 | this(DEFAULT_SRU_VERSION, true); |
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87 | } |
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88 | |
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89 | |
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90 | /** |
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91 | * Constructor. This constructor will create a <em>strict</em> client. |
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92 | * |
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93 | * @param defaultVersion |
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94 | * the default version to use for SRU requests; may be overridden |
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95 | * by individual requests |
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96 | * @see #SRUClient(SRUVersion, boolean) |
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97 | */ |
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98 | public SRUClient(SRUVersion defaultVersion) { |
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99 | this(defaultVersion, true); |
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100 | } |
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101 | |
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102 | |
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103 | /** |
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104 | * Constructor. |
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105 | * |
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106 | * @param defaultVersion |
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107 | * the default version to use for SRU requests; may be overridden |
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108 | * by individual requests |
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109 | * @param strictMode |
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110 | * if <code>true</code> the client will strictly adhere to the |
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111 | * SRU standard and raise fatal errors on violations, if |
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112 | * <code>false</code> it will act more forgiving and ignore |
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113 | * certain violations |
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114 | * |
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115 | */ |
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116 | public SRUClient(SRUVersion defaultVersion, boolean strictMode) { |
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117 | if (defaultVersion == null) { |
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118 | throw new NullPointerException("version == null"); |
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119 | } |
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120 | this.defaultVersion = defaultVersion; |
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121 | this.strictMode = strictMode; |
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122 | this.httpClient = new DefaultHttpClient(); |
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123 | this.httpClient.getParams().setParameter(CoreProtocolPNames.USER_AGENT, |
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124 | "eu.clarin.sru.client/0.0.1"); |
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125 | } |
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126 | |
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127 | |
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128 | /** |
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129 | * Get the SRU protocol conformance mode of the client. |
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130 | * |
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131 | * @return <code>true</code> if the client operation in strict mode, |
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132 | * <code>false</code> otherwise |
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133 | */ |
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134 | public boolean isStrictMode() { |
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135 | return strictMode; |
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136 | } |
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137 | |
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138 | |
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139 | /** |
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140 | * Set the SRU protocol conformance mode of the client. |
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141 | * |
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142 | * @param strictMode |
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143 | * <code>true</code> if the client should operate in strict mode, |
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144 | * <code>false</code> if the client should be more tolerant |
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145 | */ |
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146 | public void setStrictMode(boolean strictMode) { |
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147 | this.strictMode = strictMode; |
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148 | } |
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149 | |
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150 | /** |
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151 | * Register a record data parser. |
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152 | * |
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153 | * @param parser |
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154 | * a parser instance |
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155 | * @throws SRUClientException |
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156 | * if a parser handing the same record schema is already |
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157 | * registered |
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158 | * @throws NullPointerException |
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159 | * if any required argument is <code>null</code> |
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160 | * @throws IllegalArgumentException |
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161 | * if the supplied parser is invalid |
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162 | */ |
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163 | public void registerRecordParser(SRURecordDataParser parser) |
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164 | throws SRUClientException { |
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165 | if (parser == null) { |
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166 | throw new NullPointerException("parser == null"); |
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167 | } |
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168 | final String recordSchema = parser.getRecordSchema(); |
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169 | if (recordSchema == null) { |
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170 | throw new NullPointerException("parser.getRecordSchema() == null"); |
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171 | } |
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172 | if (recordSchema.isEmpty()) { |
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173 | throw new IllegalArgumentException( |
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174 | "parser.getRecordSchema() returns empty string"); |
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175 | } |
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176 | |
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177 | if (!parsers.containsKey(recordSchema)) { |
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178 | parsers.put(recordSchema, parser); |
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179 | } else { |
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180 | throw new SRUClientException( |
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181 | "record data parser already registered: " + recordSchema); |
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182 | } |
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183 | } |
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184 | |
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185 | |
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186 | /** |
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187 | * Perform a <em>explain</em> operation. |
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188 | * |
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189 | * @param request |
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190 | * an instance of a {@link SRUExplainRequest} object |
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191 | * @param handler |
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192 | * an instance of {@link SRUExplainHandler} to receive callbacks |
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193 | * when processing the result of this request |
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194 | * @throws SRUClientException |
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195 | * if an unrecoverable error occurred |
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196 | * @throws NullPointerException |
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197 | * if any required argument is <code>null</code> |
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198 | * @see SRUExplainRequest |
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199 | * @see SRUExplainHandler |
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200 | */ |
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201 | public void explain(SRUExplainRequest request, SRUExplainHandler handler) |
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202 | throws SRUClientException { |
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203 | if (request == null) { |
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204 | throw new NullPointerException("request == null"); |
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205 | } |
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206 | if (handler == null) { |
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207 | throw new NullArgumentException("handler == null"); |
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208 | } |
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209 | logger.debug("explain"); |
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210 | |
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211 | final long ts_start = System.nanoTime(); |
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212 | |
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213 | // create URI and perform request |
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214 | final URI uri = request.makeURI(defaultVersion); |
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215 | HttpResponse response = executeRequest(uri); |
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216 | HttpEntity entity = response.getEntity(); |
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217 | if (entity == null) { |
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218 | throw new SRUClientException("cannot get entity"); |
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219 | } |
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220 | |
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221 | InputStream stream = null; |
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222 | SRUXMLStreamReader reader = null; |
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223 | try { |
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224 | stream = entity.getContent(); |
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225 | |
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226 | final long ts_parsing = System.nanoTime(); |
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227 | reader = createReader(stream, true); |
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228 | parseExplainResponse(reader, request, handler); |
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229 | final long ts_end = System.nanoTime(); |
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230 | |
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231 | final long millisTotal = |
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232 | TimeUnit.NANOSECONDS.toMillis(ts_end - ts_start); |
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233 | final long millisNetwork = |
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234 | TimeUnit.NANOSECONDS.toMillis(ts_parsing - ts_start); |
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235 | final long millisParsing = |
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236 | TimeUnit.NANOSECONDS.toMillis(ts_end - ts_parsing); |
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237 | logger.debug("{} byte(s) in {} milli(s) ({} milli(s) network / {} milli(s) parsing)", |
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238 | new Object[] { reader.getByteCount(), |
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239 | millisTotal, millisNetwork, millisParsing }); |
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240 | handler.onRequestStatistics((int) reader.getByteCount(), |
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241 | millisTotal, millisNetwork, millisParsing); |
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242 | } catch (IllegalStateException e) { |
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243 | throw new SRUClientException("error reading response", e); |
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244 | } catch (IOException e) { |
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245 | throw new SRUClientException("error reading response", e); |
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246 | } catch (XMLStreamException e) { |
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247 | throw new SRUClientException("error reading response", e); |
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248 | } finally { |
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249 | if (reader != null) { |
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250 | try { |
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251 | reader.close(); |
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252 | } catch (XMLStreamException e) { |
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253 | /* IGNORE */ |
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254 | } |
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255 | } |
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256 | if (stream != null) { |
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257 | try { |
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258 | stream.close(); |
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259 | } catch (IOException e) { |
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260 | /* IGNORE */ |
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261 | } |
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262 | } |
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263 | } |
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264 | } |
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265 | |
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266 | |
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267 | /** |
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268 | * Perform a <em>scan</em> operation. |
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269 | * |
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270 | * @param request |
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271 | * an instance of a {@link SRUScanRequest} object |
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272 | * @param handler |
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273 | * an instance of {@link SRUScanHandler} to receive callbacks |
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274 | * when processing the result of this request |
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275 | * @throws SRUClientException |
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276 | * if an unrecoverable error occurred |
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277 | * @throws NullPointerException |
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278 | * if any required argument is <code>null</code> |
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279 | * @see SRUScanRequest |
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280 | * @see SRUScanHandler |
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281 | */ |
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282 | public void scan(SRUScanRequest request, SRUScanHandler handler) |
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283 | throws SRUClientException { |
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284 | if (request == null) { |
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285 | throw new NullPointerException("request == null"); |
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286 | } |
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287 | if (handler == null) { |
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288 | throw new NullArgumentException("handler == null"); |
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289 | } |
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290 | logger.debug("searchRetrieve: scanClause = {}", request.getScanClause()); |
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291 | |
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292 | final long ts_start = System.nanoTime(); |
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293 | |
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294 | // create URI and perform request |
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295 | final URI uri = request.makeURI(defaultVersion); |
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296 | HttpResponse response = executeRequest(uri); |
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297 | HttpEntity entity = response.getEntity(); |
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298 | if (entity == null) { |
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299 | throw new SRUClientException("cannot get entity"); |
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300 | } |
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301 | |
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302 | InputStream stream = null; |
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303 | SRUXMLStreamReader reader = null; |
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304 | try { |
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305 | stream = entity.getContent(); |
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306 | |
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307 | final long ts_parsing = System.nanoTime(); |
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308 | reader = createReader(stream, true); |
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309 | parseScanResponse(reader, request, handler); |
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310 | final long ts_end = System.nanoTime(); |
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311 | |
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312 | final long millisTotal = |
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313 | TimeUnit.NANOSECONDS.toMillis(ts_end - ts_start); |
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314 | final long millisNetwork = |
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315 | TimeUnit.NANOSECONDS.toMillis(ts_parsing - ts_start); |
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316 | final long millisParsing = |
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317 | TimeUnit.NANOSECONDS.toMillis(ts_end - ts_parsing); |
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318 | logger.debug("{} byte(s) in {} milli(s) ({} milli(s) network / {} milli(s) parsing)", |
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319 | new Object[] { reader.getByteCount(), |
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320 | millisTotal, millisNetwork, millisParsing }); |
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321 | handler.onRequestStatistics((int) reader.getByteCount(), |
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322 | millisTotal, millisNetwork, millisParsing); |
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323 | } catch (IllegalStateException e) { |
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324 | throw new SRUClientException("error reading response", e); |
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325 | } catch (IOException e) { |
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326 | throw new SRUClientException("error reading response", e); |
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327 | } catch (XMLStreamException e) { |
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328 | throw new SRUClientException("error reading response", e); |
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329 | } finally { |
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330 | if (reader != null) { |
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331 | try { |
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332 | reader.close(); |
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333 | } catch (XMLStreamException e) { |
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334 | /* IGNORE */ |
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335 | } |
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336 | } |
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337 | if (stream != null) { |
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338 | try { |
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339 | stream.close(); |
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340 | } catch (IOException e) { |
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341 | /* IGNORE */ |
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342 | } |
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343 | } |
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344 | } |
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345 | } |
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346 | |
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347 | |
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348 | /** |
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349 | * Perform a <em>searchRetreive</em> operation. |
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350 | * |
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351 | * @param request |
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352 | * an instance of a {@link SRUSearchRetrieveRequest} object |
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353 | * @param handler |
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354 | * an instance of {@link SRUSearchRetrieveHandler} to receive |
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355 | * callbacks when processing the result of this request |
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356 | * @throws SRUClientException |
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357 | * if an unrecoverable error occurred |
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358 | * @throws NullPointerException |
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359 | * if any required argument is <code>null</code> |
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360 | * @see SRUSearchRetrieveRequest |
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361 | * @see SRUSearchRetrieveHandler |
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362 | */ |
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363 | public void searchRetrieve(SRUSearchRetrieveRequest request, |
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364 | SRUSearchRetrieveHandler handler) throws SRUClientException { |
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365 | if (request == null) { |
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366 | throw new NullPointerException("request == null"); |
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367 | } |
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368 | if (handler == null) { |
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369 | throw new NullArgumentException("handler == null"); |
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370 | } |
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371 | logger.debug("searchRetrieve: query = {}", request.getQuery()); |
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372 | |
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373 | final long ts_start = System.nanoTime(); |
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374 | |
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375 | // create URI and perform request |
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376 | final URI uri = request.makeURI(defaultVersion); |
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377 | HttpResponse response = executeRequest(uri); |
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378 | HttpEntity entity = response.getEntity(); |
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379 | if (entity == null) { |
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380 | throw new SRUClientException("cannot get entity"); |
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381 | } |
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382 | |
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383 | InputStream stream = null; |
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384 | SRUXMLStreamReader reader = null; |
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385 | try { |
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386 | stream = entity.getContent(); |
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387 | |
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388 | final long ts_parsing = System.nanoTime(); |
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389 | reader = createReader(stream, true); |
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390 | parseSearchRetrieveResponse(reader, request, handler); |
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391 | final long ts_end = System.nanoTime(); |
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392 | |
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393 | final long millisTotal = |
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394 | TimeUnit.NANOSECONDS.toMillis(ts_end - ts_start); |
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395 | final long millisNetwork = |
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396 | TimeUnit.NANOSECONDS.toMillis(ts_parsing - ts_start); |
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397 | final long millisParsing = |
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398 | TimeUnit.NANOSECONDS.toMillis(ts_end - ts_parsing); |
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399 | logger.debug("{} byte(s) in {} milli(s) ({} milli(s) network / {} milli(s) parsing)", |
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400 | new Object[] { reader.getByteCount(), |
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401 | millisTotal, millisNetwork, millisParsing }); |
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402 | handler.onRequestStatistics((int) reader.getByteCount(), |
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403 | millisTotal, millisNetwork, millisParsing); |
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404 | } catch (IllegalStateException e) { |
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405 | throw new SRUClientException("error reading response", e); |
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406 | } catch (IOException e) { |
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407 | throw new SRUClientException("error reading response", e); |
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408 | } catch (XMLStreamException e) { |
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409 | throw new SRUClientException("error reading response", e); |
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410 | } finally { |
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411 | if (reader != null) { |
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412 | try { |
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413 | reader.close(); |
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414 | } catch (XMLStreamException e) { |
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415 | /* IGNORE */ |
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416 | } |
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417 | } |
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418 | if (stream != null) { |
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419 | try { |
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420 | stream.close(); |
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421 | } catch (IOException e) { |
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422 | /* IGNORE */ |
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423 | } |
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424 | } |
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425 | } |
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426 | } |
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427 | |
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428 | |
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429 | private HttpResponse executeRequest(URI uri) throws SRUClientException { |
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430 | HttpGet request = null; |
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431 | HttpResponse response = null; |
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432 | try { |
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433 | logger.debug("executing HTTP request: {}", uri.toString()); |
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434 | try { |
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435 | request = new HttpGet(uri); |
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436 | response = httpClient.execute(request); |
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437 | StatusLine status = response.getStatusLine(); |
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438 | if (status.getStatusCode() != HttpStatus.SC_OK) { |
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439 | if (status.getStatusCode() == HttpStatus.SC_NOT_FOUND) { |
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440 | throw new SRUClientException("not found: " + uri); |
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441 | } else { |
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442 | throw new SRUClientException("unexpected status: " + |
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443 | status.getStatusCode()); |
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444 | } |
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445 | } |
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446 | return response; |
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447 | } catch (ClientProtocolException e) { |
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448 | throw new SRUClientException("client protocol exception", e); |
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449 | } catch (UnknownHostException e) { |
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450 | throw new SRUClientException("unknown host: " + uri.getHost(), |
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451 | e); |
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452 | } catch (IOException e) { |
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453 | throw new SRUClientException("input/output error", e); |
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454 | } |
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455 | } catch (SRUClientException e) { |
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456 | /* |
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457 | * if an error occurred, make sure we are freeing up the resources |
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458 | * we've used |
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459 | */ |
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460 | if (response != null) { |
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461 | try { |
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462 | EntityUtils.consume(response.getEntity()); |
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463 | } catch (IOException ex) { |
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464 | /* IGNORE */ |
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465 | } |
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466 | } |
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467 | if (request != null) { |
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468 | request.abort(); |
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469 | } |
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470 | throw e; |
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471 | } |
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472 | } |
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473 | |
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474 | |
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475 | private void parseExplainResponse(final SRUXMLStreamReader reader, |
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476 | final SRUAbstractRequest request, final SRUExplainHandler handler) |
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477 | throws SRUClientException { |
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478 | logger.debug("parsing 'explain' response"); |
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479 | try { |
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480 | // explainResponse |
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481 | reader.readStart(SRU_NS, "explainResponse", true); |
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482 | |
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483 | // explainResponse/version |
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484 | SRUVersion version = parseVersion(reader); |
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485 | logger.debug("version = {}, requested = {}", |
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486 | version, request.getVersionPerformed()); |
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487 | |
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488 | // explainResponse/record |
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489 | reader.readStart(SRU_NS, "record", true); |
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490 | |
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491 | String schema = reader.readContent(SRU_NS, "recordSchema", true); |
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492 | |
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493 | SRURecordPacking packing = parseRecordPacking(reader, strictMode); |
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494 | |
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495 | logger.debug("schema = {}, packing = {}", schema, packing); |
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496 | |
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497 | // explainResponse/record/recordData |
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498 | reader.readStart(SRU_NS, "recordData", true); |
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499 | reader.readEnd(SRU_NS, "recordData", true); |
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500 | |
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501 | // explainResponse/record/recordPosition |
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502 | if (reader.readStart(SRU_NS, "recordPosition", false)) { |
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503 | reader.readEnd(SRU_NS, "recordPosition", true); |
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504 | } |
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505 | |
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506 | // explainResponse/record/extraRecordData |
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507 | if (reader.readStart(SRU_NS, "extraRecordData", false)) { |
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508 | reader.readEnd(SRU_NS, "extraRecordData", true); |
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509 | } |
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510 | |
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511 | reader.readEnd(SRU_NS, "record"); |
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512 | |
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513 | // explainResponse/echoedExplainRequest |
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514 | if (reader.readStart(SRU_NS, "echoedExplainRequest", false)) { |
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515 | reader.readEnd(SRU_NS, "echoedExplainRequest", true); |
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516 | } |
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517 | |
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518 | /* |
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519 | * common error: echoedExplainRequest in default namespace |
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520 | */ |
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521 | if (reader.readStart("", "echoedExplainRequest", false)) { |
---|
522 | logger.error("Element 'echoedExplainRequest' must be in SRU namespace, but endpoint put it into default namespace"); |
---|
523 | if (strictMode) { |
---|
524 | throw new SRUClientException("Element 'echoedExplainRequest' must be in SRU namespace, but endpoint put it into default namespace"); |
---|
525 | } |
---|
526 | reader.readEnd("", "echoedExplainRequest", true); |
---|
527 | } |
---|
528 | |
---|
529 | // explainResponse/diagnostics |
---|
530 | final List<SRUDiagnostic> diagnostics = parseDiagnostics(reader); |
---|
531 | if (diagnostics != null) { |
---|
532 | handler.onDiagnostics(diagnostics); |
---|
533 | } |
---|
534 | |
---|
535 | // explainResponse/extraResponseData |
---|
536 | if (reader.readStart(SRU_NS, "extraResponseData", false)) { |
---|
537 | reader.consumeWhitespace(); |
---|
538 | proxy.reset(reader); |
---|
539 | try { |
---|
540 | handler.onExtraResponseData(proxy); |
---|
541 | } catch (XMLStreamException e) { |
---|
542 | throw new SRUClientException("handler triggered " |
---|
543 | + "error while parsing 'extraResponseData'", e); |
---|
544 | } |
---|
545 | reader.consumeWhitespace(); |
---|
546 | reader.readEnd(SRU_NS, "extraResponseData", true); |
---|
547 | } |
---|
548 | |
---|
549 | reader.readEnd(SRU_NS, "explainResponse"); |
---|
550 | } catch (XMLStreamException e) { |
---|
551 | throw new SRUClientException(e.getMessage(), e); |
---|
552 | } |
---|
553 | } |
---|
554 | |
---|
555 | |
---|
556 | private void parseScanResponse(final SRUXMLStreamReader reader, |
---|
557 | final SRUScanRequest request, final SRUScanHandler handler) |
---|
558 | throws SRUClientException { |
---|
559 | try { |
---|
560 | /* |
---|
561 | * if the endpoint cannot determine the operation, it should create |
---|
562 | * a explain response. |
---|
563 | */ |
---|
564 | if (reader.peekStart(SRU_NS, "explainResponse")) { |
---|
565 | parseExplainResponse(reader, request, new SRUExplainHandler() { |
---|
566 | @Override |
---|
567 | public void onRequestStatistics(int bytes, long millisTotal, |
---|
568 | long millisNetwork, long millisParsing) { |
---|
569 | } |
---|
570 | |
---|
571 | |
---|
572 | @Override |
---|
573 | public void onExtraResponseData(XMLStreamReader reader) |
---|
574 | throws XMLStreamException, SRUClientException { |
---|
575 | } |
---|
576 | |
---|
577 | |
---|
578 | @Override |
---|
579 | public void onDiagnostics(List<SRUDiagnostic> diagnostics) |
---|
580 | throws SRUClientException { |
---|
581 | handler.onDiagnostics(diagnostics); |
---|
582 | } |
---|
583 | }); |
---|
584 | } else { |
---|
585 | logger.debug("parsing 'scanResponse' response"); |
---|
586 | |
---|
587 | // scanResponse |
---|
588 | reader.readStart(SRU_NS, "scanResponse", true); |
---|
589 | |
---|
590 | // scanResponse/version |
---|
591 | SRUVersion version = parseVersion(reader); |
---|
592 | logger.debug("version = {}, requested = {}", version, |
---|
593 | request.getVersionPerformed()); |
---|
594 | |
---|
595 | // scanResponse/terms |
---|
596 | if (reader.readStart(SRU_NS, "terms", false)) { |
---|
597 | boolean first = true; |
---|
598 | while (reader.readStart(SRU_NS, "term", first)) { |
---|
599 | if (first) { |
---|
600 | first = false; |
---|
601 | handler.onStartTerms(); |
---|
602 | } |
---|
603 | |
---|
604 | // scanResponse/terms/value |
---|
605 | String value = reader |
---|
606 | .readContent(SRU_NS, "value", true); |
---|
607 | |
---|
608 | // scanResponse/terms/numberOfRecords |
---|
609 | int numberOfRecords = reader.readContent(SRU_NS, |
---|
610 | "numberOfRecords", false, -1); |
---|
611 | |
---|
612 | // scanResponse/terms/displayTerm |
---|
613 | String displayTerm = reader.readContent(SRU_NS, |
---|
614 | "displayTerm", false); |
---|
615 | |
---|
616 | // scanResponse/terms/whereInList |
---|
617 | String s = reader.readContent(SRU_NS, |
---|
618 | "whereInList", false); |
---|
619 | WhereInList whereInList = null; |
---|
620 | if (s != null) { |
---|
621 | if ("first".equals(s)) { |
---|
622 | whereInList = WhereInList.FIRST; |
---|
623 | } else if ("last".equals(s)) { |
---|
624 | whereInList = WhereInList.LAST; |
---|
625 | } else if ("only".equals(s)) { |
---|
626 | whereInList = WhereInList.ONLY; |
---|
627 | } else if ("inner".equals(s)) { |
---|
628 | whereInList = WhereInList.INNER; |
---|
629 | } else { |
---|
630 | throw new SRUClientException( |
---|
631 | "invalid value for 'whereInList': " + s); |
---|
632 | } |
---|
633 | } |
---|
634 | logger.debug("value = {}, numberOfRecords = {}, " |
---|
635 | + "displayTerm = {}, whereInList = {}", |
---|
636 | new Object[] { value, numberOfRecords, |
---|
637 | displayTerm, whereInList }); |
---|
638 | handler.onTerm(value, numberOfRecords, displayTerm, |
---|
639 | whereInList); |
---|
640 | |
---|
641 | // scanResponse/terms/extraTermData |
---|
642 | if (reader.readStart(SRU_NS, "extraTermData", first)) { |
---|
643 | reader.consumeWhitespace(); |
---|
644 | proxy.reset(reader); |
---|
645 | try { |
---|
646 | handler.onExtraTermData(value, proxy); |
---|
647 | } catch (XMLStreamException e) { |
---|
648 | throw new SRUClientException("handler " |
---|
649 | + "triggered error while parsing " |
---|
650 | + "'extraTermData'", e); |
---|
651 | } |
---|
652 | reader.consumeWhitespace(); |
---|
653 | reader.readEnd(SRU_NS, "extraTermData", true); |
---|
654 | } |
---|
655 | reader.readEnd(SRU_NS, "term", true); |
---|
656 | |
---|
657 | } // while |
---|
658 | reader.readEnd(SRU_NS, "terms"); |
---|
659 | handler.onFinishTerms(); |
---|
660 | } |
---|
661 | |
---|
662 | // scanResponse/echoedScanRequest |
---|
663 | if (reader.readStart(SRU_NS, "echoedScanRequest", false)) { |
---|
664 | reader.readEnd(SRU_NS, "echoedScanRequest", true); |
---|
665 | } |
---|
666 | |
---|
667 | /* |
---|
668 | * common error: echoedScanRequest in default namespace |
---|
669 | */ |
---|
670 | if (reader.readStart("", "echoedScanRequest", false)) { |
---|
671 | logger.error("Element 'echoedScanRequest' must be in SRU namespace, but endpoint put it into default namespace"); |
---|
672 | if (strictMode) { |
---|
673 | throw new SRUClientException("Element 'echoedScanRequest' must be in SRU namespace, but endpoint put it into default namespace"); |
---|
674 | } |
---|
675 | reader.readEnd("", "echoedScanRequest", true); |
---|
676 | } |
---|
677 | |
---|
678 | // scanResponse/diagnostics |
---|
679 | final List<SRUDiagnostic> diagnostics = parseDiagnostics(reader); |
---|
680 | if (diagnostics != null) { |
---|
681 | handler.onDiagnostics(diagnostics); |
---|
682 | } |
---|
683 | |
---|
684 | // scanResponse/extraResponseData |
---|
685 | if (reader.readStart(SRU_NS, "extraResponseData", false)) { |
---|
686 | reader.consumeWhitespace(); |
---|
687 | proxy.reset(reader); |
---|
688 | try { |
---|
689 | handler.onExtraResponseData(proxy); |
---|
690 | } catch (XMLStreamException e) { |
---|
691 | throw new SRUClientException("handler triggered " |
---|
692 | + "error while parsing 'extraResponseData'", e); |
---|
693 | } |
---|
694 | reader.consumeWhitespace(); |
---|
695 | reader.readEnd(SRU_NS, "extraResponseData", true); |
---|
696 | } |
---|
697 | |
---|
698 | reader.readEnd(SRU_NS, "scanResponse"); |
---|
699 | } |
---|
700 | } catch (XMLStreamException e) { |
---|
701 | throw new SRUClientException(e.getMessage(), e); |
---|
702 | } |
---|
703 | } |
---|
704 | |
---|
705 | |
---|
706 | private void parseSearchRetrieveResponse(final SRUXMLStreamReader reader, |
---|
707 | final SRUSearchRetrieveRequest request, |
---|
708 | final SRUSearchRetrieveHandler handler) throws SRUClientException { |
---|
709 | try { |
---|
710 | /* |
---|
711 | * if the endpoint cannot determine the operation, it should create |
---|
712 | * a explain response. |
---|
713 | */ |
---|
714 | if (reader.peekStart(SRU_NS, "explainResponse")) { |
---|
715 | parseExplainResponse(reader, request, new SRUExplainHandler() { |
---|
716 | @Override |
---|
717 | public void onRequestStatistics(int bytes, long millisTotal, |
---|
718 | long millisNetwork, long millisParsing) { |
---|
719 | } |
---|
720 | |
---|
721 | |
---|
722 | @Override |
---|
723 | public void onExtraResponseData(XMLStreamReader reader) |
---|
724 | throws XMLStreamException, SRUClientException { |
---|
725 | } |
---|
726 | |
---|
727 | |
---|
728 | @Override |
---|
729 | public void onDiagnostics(List<SRUDiagnostic> diagnostics) |
---|
730 | throws SRUClientException { |
---|
731 | handler.onDiagnostics(diagnostics); |
---|
732 | } |
---|
733 | }); |
---|
734 | } else { |
---|
735 | logger.debug("parsing 'serarchRetrieve' response"); |
---|
736 | |
---|
737 | // searchRetrieveResponse |
---|
738 | reader.readStart(SRU_NS, "searchRetrieveResponse", true); |
---|
739 | |
---|
740 | // searchRetrieveResponse/version |
---|
741 | SRUVersion version = parseVersion(reader); |
---|
742 | logger.debug("version = {}, requested = {}", version, |
---|
743 | request.getVersionPerformed()); |
---|
744 | |
---|
745 | // searchRetrieveResponse/numberOfRecords |
---|
746 | int numberOfRecords = reader.readContent(SRU_NS, |
---|
747 | "numberOfRecords", true, -1); |
---|
748 | |
---|
749 | // searchRetrieveResponse/resultSetId |
---|
750 | int resultSetId = reader.readContent(SRU_NS, |
---|
751 | "resultSetId", false, -1); |
---|
752 | |
---|
753 | // searchRetrieveResponse/resultSetIdleTime |
---|
754 | int resultSetIdleTime = reader.readContent(SRU_NS, |
---|
755 | "resultSetIdleTime", false, -1); |
---|
756 | |
---|
757 | logger.debug("numberOfRecords = {}, resultSetId = {}, " |
---|
758 | + "resultSetIdleTime = {}", new Object[] { |
---|
759 | numberOfRecords, resultSetId, resultSetIdleTime }); |
---|
760 | |
---|
761 | // searchRetrieveResponse/results |
---|
762 | if (numberOfRecords > 0) { |
---|
763 | reader.readStart(SRU_NS, "records", true); |
---|
764 | |
---|
765 | // searchRetrieveResponse/records/record |
---|
766 | boolean first = true; |
---|
767 | while (reader.readStart(SRU_NS, "record", first)) { |
---|
768 | if (first) { |
---|
769 | first = false; |
---|
770 | handler.onStartRecords(numberOfRecords, |
---|
771 | resultSetId, resultSetIdleTime); |
---|
772 | } |
---|
773 | |
---|
774 | String schema = reader.readContent(SRU_NS, |
---|
775 | "recordSchema", true); |
---|
776 | |
---|
777 | SRURecordPacking packing = |
---|
778 | parseRecordPacking(reader, strictMode); |
---|
779 | |
---|
780 | logger.debug("schema = {}, packing = {}, " + |
---|
781 | "requested packing = {}", |
---|
782 | new Object[] { schema, packing, |
---|
783 | request.getRecordPacking() }); |
---|
784 | |
---|
785 | if ((request.getRecordPacking() != null) && |
---|
786 | (packing != request.getRecordPacking())) { |
---|
787 | final SRURecordPacking p = |
---|
788 | request.getRecordPacking(); |
---|
789 | logger.error("requested '{}' record packing, but " + |
---|
790 | "server responded with '{}' record packing", |
---|
791 | p.getStringValue(), |
---|
792 | packing.getStringValue()); |
---|
793 | if (strictMode) { |
---|
794 | throw new SRUClientException("requested '" + |
---|
795 | p.getStringValue() + |
---|
796 | "' record packing, but server " + |
---|
797 | "responded with '" + |
---|
798 | packing.getStringValue() + |
---|
799 | "' record packing"); |
---|
800 | } |
---|
801 | } |
---|
802 | |
---|
803 | // searchRetrieveResponse/record/recordData |
---|
804 | reader.readStart(SRU_NS, "recordData", true); |
---|
805 | reader.consumeWhitespace(); |
---|
806 | |
---|
807 | SRURecordData recordData = null; |
---|
808 | SRUDiagnostic surrogate = null; |
---|
809 | SRUXMLStreamReader recordReader = null; |
---|
810 | |
---|
811 | if (packing == SRURecordPacking.STRING) { |
---|
812 | /* |
---|
813 | * read content into temporary buffer and then use |
---|
814 | * a new XML reader to parse record data |
---|
815 | */ |
---|
816 | final String data = reader.readString(true); |
---|
817 | InputStream in = |
---|
818 | new ByteArrayInputStream(data.getBytes()); |
---|
819 | // FIXME: namespace context? |
---|
820 | recordReader = createReader(in, false); |
---|
821 | } else { |
---|
822 | recordReader = reader; |
---|
823 | } |
---|
824 | |
---|
825 | if (SRU_DIAGNOSTIC_RECORD_SCHEMA.equals(schema)) { |
---|
826 | surrogate = parseDiagnostic(recordReader, true); |
---|
827 | } else { |
---|
828 | SRURecordDataParser parser = findParser(schema); |
---|
829 | if (parser != null) { |
---|
830 | try { |
---|
831 | proxy.reset(recordReader); |
---|
832 | recordData = parser.parse(proxy); |
---|
833 | } catch (XMLStreamException e) { |
---|
834 | throw new SRUClientException( |
---|
835 | "error parsing record", e); |
---|
836 | } |
---|
837 | if (recordData == null) { |
---|
838 | // FIXME: handle this better? maybe throw? |
---|
839 | logger.warn("parse did not correctly " |
---|
840 | + "parse the record, will skip " |
---|
841 | + "handler callback."); |
---|
842 | } |
---|
843 | } else { |
---|
844 | // FIXME: handle this better? |
---|
845 | logger.debug("no record parser found for schema '{}'", |
---|
846 | schema); |
---|
847 | } |
---|
848 | } |
---|
849 | |
---|
850 | if (packing == SRURecordPacking.STRING) { |
---|
851 | recordReader.closeCompletly(); |
---|
852 | } |
---|
853 | |
---|
854 | reader.consumeWhitespace(); |
---|
855 | reader.readEnd(SRU_NS, "recordData", true); |
---|
856 | |
---|
857 | String identifier = null; |
---|
858 | if (version == SRUVersion.VERSION_1_2) { |
---|
859 | identifier = reader.readContent(SRU_NS, |
---|
860 | "recordIdentifier", false); |
---|
861 | } |
---|
862 | |
---|
863 | int position = reader.readContent(SRU_NS, |
---|
864 | "recordPosition", false, -1); |
---|
865 | |
---|
866 | logger.debug("recordIdentifier = {}, recordPosition = {}", |
---|
867 | identifier, position); |
---|
868 | |
---|
869 | // notify handler |
---|
870 | if (surrogate != null) { |
---|
871 | handler.onSurrogateRecord(identifier, |
---|
872 | position, surrogate); |
---|
873 | } else { |
---|
874 | if (recordData != null) { |
---|
875 | handler.onRecord(identifier, |
---|
876 | position, recordData); |
---|
877 | } |
---|
878 | } |
---|
879 | |
---|
880 | if (reader.readStart(SRU_NS, "extraRecordData", false)) { |
---|
881 | reader.consumeWhitespace(); |
---|
882 | proxy.reset(reader); |
---|
883 | try { |
---|
884 | handler.onExtraRecordData(identifier, |
---|
885 | position, proxy); |
---|
886 | } catch (XMLStreamException e) { |
---|
887 | throw new SRUClientException("handler " |
---|
888 | + "triggered error while parsing " |
---|
889 | + "'extraRecordData'", e); |
---|
890 | } |
---|
891 | reader.consumeWhitespace(); |
---|
892 | reader.readEnd(SRU_NS, "extraRecordData", true); |
---|
893 | } |
---|
894 | |
---|
895 | reader.readEnd(SRU_NS, "record"); |
---|
896 | } // while |
---|
897 | reader.readEnd(SRU_NS, "records"); |
---|
898 | } else { |
---|
899 | /* |
---|
900 | * provide a better error format, if |
---|
901 | */ |
---|
902 | if (reader.readStart(SRU_NS, "records", false)) { |
---|
903 | int bad = 0; |
---|
904 | while (reader.readStart(SRU_NS, "record", false)) { |
---|
905 | bad++; |
---|
906 | reader.readEnd(SRU_NS, "record", true); |
---|
907 | } |
---|
908 | reader.readEnd(SRU_NS, "records", true); |
---|
909 | if (bad == 0) { |
---|
910 | logger.error("endpoint declared 0 results, but " + |
---|
911 | "response contained an empty 'records' " + |
---|
912 | "element"); |
---|
913 | if (strictMode) { |
---|
914 | throw new SRUClientException( |
---|
915 | "endpoint declared 0 results, but response contained an empty 'records' element (behavior violates SRU specification)"); |
---|
916 | } |
---|
917 | } else { |
---|
918 | logger.error("endpoint declared 0 results, but " + |
---|
919 | "response contained an " + bad + |
---|
920 | " record(s)"); |
---|
921 | if (strictMode) { |
---|
922 | throw new SRUClientException("endpoint declared 0 results, but response containted " + |
---|
923 | bad + " records (behavior may violate SRU specification)"); |
---|
924 | } |
---|
925 | } |
---|
926 | } |
---|
927 | } |
---|
928 | |
---|
929 | int nextRecordPosition = reader.readContent(SRU_NS, |
---|
930 | "nextRecordPosition", false, -1); |
---|
931 | logger.debug("nextRecordPosition = {}", nextRecordPosition); |
---|
932 | handler.onFinishRecords(nextRecordPosition); |
---|
933 | |
---|
934 | // searchRetrieveResponse/echoedSearchRetrieveResponse |
---|
935 | if (reader.readStart(SRU_NS, |
---|
936 | "echoedSearchRetrieveRequest", false)) { |
---|
937 | reader.readEnd(SRU_NS, "echoedSearchRetrieveRequest", true); |
---|
938 | } |
---|
939 | |
---|
940 | /* |
---|
941 | * common error: echoedSearchRetrieveRequest in default namespace |
---|
942 | */ |
---|
943 | if (reader.readStart("", "echoedSearchRetrieveRequest", false)) { |
---|
944 | logger.error("Element 'echoedSearchRetrieveRequest' must be in SRU namespace, but endpoint put it into default namespace"); |
---|
945 | if (strictMode) { |
---|
946 | throw new SRUClientException("Element 'echoedSearchRetrieveRequest' must be in SRU namespace, but endpoint put it into default namespace"); |
---|
947 | } |
---|
948 | reader.readEnd("", "echoedSearchRetrieveRequest", true); |
---|
949 | } |
---|
950 | |
---|
951 | // searchRetrieveResponse/diagnostics |
---|
952 | final List<SRUDiagnostic> diagnostics = parseDiagnostics(reader); |
---|
953 | if (diagnostics != null) { |
---|
954 | handler.onDiagnostics(diagnostics); |
---|
955 | } |
---|
956 | |
---|
957 | // explainResponse/extraResponseData |
---|
958 | if (reader.readStart(SRU_NS, "extraResponseData", false)) { |
---|
959 | reader.consumeWhitespace(); |
---|
960 | proxy.reset(reader); |
---|
961 | try { |
---|
962 | handler.onExtraResponseData(proxy); |
---|
963 | } catch (XMLStreamException e) { |
---|
964 | throw new SRUClientException("handler triggered " |
---|
965 | + "error while parsing 'extraResponseData'", e); |
---|
966 | } |
---|
967 | reader.consumeWhitespace(); |
---|
968 | reader.readEnd(SRU_NS, "extraResponseData", true); |
---|
969 | } |
---|
970 | |
---|
971 | reader.readEnd(SRU_NS, "searchRetrieveResponse"); |
---|
972 | } |
---|
973 | } catch (XMLStreamException e) { |
---|
974 | throw new SRUClientException(e.getMessage(), e); |
---|
975 | } |
---|
976 | } |
---|
977 | |
---|
978 | |
---|
979 | private static SRUVersion parseVersion(SRUXMLStreamReader reader) |
---|
980 | throws XMLStreamException, SRUClientException { |
---|
981 | final String v = reader.readContent(SRU_NS, "version", true); |
---|
982 | if (VERSION_1_1.equals(v)) { |
---|
983 | return SRUVersion.VERSION_1_1; |
---|
984 | } else if (VERSION_1_2.equals(v)) { |
---|
985 | return SRUVersion.VERSION_1_2; |
---|
986 | } else { |
---|
987 | throw new SRUClientException("invalid value '" + v + |
---|
988 | "' for version (valid values are: '" + VERSION_1_1 + |
---|
989 | "' and '" + VERSION_1_2 + "')"); |
---|
990 | } |
---|
991 | } |
---|
992 | |
---|
993 | |
---|
994 | private static List<SRUDiagnostic> parseDiagnostics( |
---|
995 | SRUXMLStreamReader reader) throws XMLStreamException, |
---|
996 | SRUClientException { |
---|
997 | if (reader.readStart(SRU_NS, "diagnostics", false)) { |
---|
998 | List<SRUDiagnostic> diagnostics = null; |
---|
999 | |
---|
1000 | SRUDiagnostic diagnostic = null; |
---|
1001 | while ((diagnostic = parseDiagnostic(reader, |
---|
1002 | (diagnostics == null))) != null) { |
---|
1003 | if (diagnostics == null) { |
---|
1004 | diagnostics = new ArrayList<SRUDiagnostic>(); |
---|
1005 | } |
---|
1006 | diagnostics.add(diagnostic); |
---|
1007 | } // while |
---|
1008 | reader.readEnd(SRU_NS, "diagnostics"); |
---|
1009 | return diagnostics; |
---|
1010 | } else { |
---|
1011 | return null; |
---|
1012 | } |
---|
1013 | } |
---|
1014 | |
---|
1015 | |
---|
1016 | private static SRUDiagnostic parseDiagnostic(SRUXMLStreamReader reader, |
---|
1017 | boolean required) throws XMLStreamException, SRUClientException { |
---|
1018 | if (reader.readStart(SRU_DIAGNOSIC_NS, "diagnostic", required)) { |
---|
1019 | |
---|
1020 | // diagnostic/uri |
---|
1021 | String uri = reader.readContent(SRU_DIAGNOSIC_NS, "uri", true); |
---|
1022 | |
---|
1023 | // diagnostic/details |
---|
1024 | String details = |
---|
1025 | reader.readContent(SRU_DIAGNOSIC_NS, "details", false); |
---|
1026 | |
---|
1027 | // diagnostic/message |
---|
1028 | String message = |
---|
1029 | reader.readContent(SRU_DIAGNOSIC_NS, "message", false); |
---|
1030 | |
---|
1031 | reader.readEnd(SRU_DIAGNOSIC_NS, "diagnostic"); |
---|
1032 | |
---|
1033 | logger.debug("diagostic: uri={}, detail={}, message={}", |
---|
1034 | new Object[] { uri, details, message }); |
---|
1035 | return new SRUDiagnostic(uri, details, message); |
---|
1036 | } else { |
---|
1037 | return null; |
---|
1038 | } |
---|
1039 | } |
---|
1040 | |
---|
1041 | |
---|
1042 | private static SRURecordPacking parseRecordPacking( |
---|
1043 | SRUXMLStreamReader reader, boolean pedantic) |
---|
1044 | throws XMLStreamException, SRUClientException { |
---|
1045 | final String v = reader.readContent(SRU_NS, "recordPacking", true); |
---|
1046 | |
---|
1047 | if (RECORD_PACKING_XML.equals(v)) { |
---|
1048 | return SRURecordPacking.XML; |
---|
1049 | } else if (RECORD_PACKING_STRING.equals(v)) { |
---|
1050 | return SRURecordPacking.STRING; |
---|
1051 | } else if (!pedantic && RECORD_PACKING_XML.equalsIgnoreCase(v)) { |
---|
1052 | logger.error("invalid value '{}' for record packing, should be '{}'", |
---|
1053 | v, RECORD_PACKING_XML); |
---|
1054 | return SRURecordPacking.XML; |
---|
1055 | } else if (!pedantic && RECORD_PACKING_STRING.equalsIgnoreCase(v)) { |
---|
1056 | logger.error("invalid value '{}' for record packing, should be '{}'", |
---|
1057 | v, RECORD_PACKING_STRING); |
---|
1058 | return SRURecordPacking.STRING; |
---|
1059 | |
---|
1060 | } else { |
---|
1061 | throw new SRUClientException("invalid value '" + v + |
---|
1062 | "' for record packing (valid values are: '" + |
---|
1063 | RECORD_PACKING_XML + "' and '" + RECORD_PACKING_STRING + |
---|
1064 | "')"); |
---|
1065 | } |
---|
1066 | } |
---|
1067 | |
---|
1068 | |
---|
1069 | private SRURecordDataParser findParser(String schema) { |
---|
1070 | SRURecordDataParser parser = parsers.get(schema); |
---|
1071 | if (parser == null) { |
---|
1072 | parser = parsers.get(RECORD_DATA_PARSER_SCHEMA_ANY); |
---|
1073 | } |
---|
1074 | return parser; |
---|
1075 | } |
---|
1076 | |
---|
1077 | |
---|
1078 | private SRUXMLStreamReader createReader(InputStream in, boolean wrap) |
---|
1079 | throws XMLStreamException { |
---|
1080 | return new SRUXMLStreamReader(in, wrap); |
---|
1081 | } |
---|
1082 | |
---|
1083 | } // class SRUClient |
---|