1 | package eu.clarin.cmdi.mdservice.action; |
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2 | |
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3 | import java.io.BufferedInputStream; |
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4 | import java.io.BufferedReader; |
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5 | import java.io.ByteArrayInputStream; |
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6 | import java.io.File; |
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7 | import java.io.FileInputStream; |
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8 | import java.io.IOException; |
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9 | import java.io.InputStream; |
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10 | import java.io.InputStreamReader; |
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11 | import java.io.StringWriter; |
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12 | import java.io.UnsupportedEncodingException; |
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13 | import java.net.MalformedURLException; |
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14 | import java.net.URISyntaxException; |
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15 | import java.net.URL; |
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16 | import java.util.HashMap; |
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17 | import java.util.Iterator; |
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18 | import java.util.Map; |
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19 | import java.util.Set; |
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20 | |
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21 | import javax.servlet.http.HttpServletRequest; |
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22 | import javax.servlet.http.HttpSession; |
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23 | import javax.xml.parsers.DocumentBuilder; |
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24 | import javax.xml.parsers.DocumentBuilderFactory; |
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25 | import javax.xml.parsers.ParserConfigurationException; |
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26 | import javax.xml.transform.TransformerConfigurationException; |
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27 | import javax.xml.transform.TransformerException; |
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28 | import javax.xml.transform.TransformerFactory; |
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29 | import javax.xml.transform.TransformerFactoryConfigurationError; |
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30 | import javax.xml.transform.dom.DOMSource; |
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31 | import javax.xml.transform.stream.StreamResult; |
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32 | |
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33 | import net.sf.json.JSON; |
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34 | import net.sf.json.JSONArray; |
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35 | import net.sf.json.JSONObject; |
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36 | import net.sf.json.JSONSerializer; |
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37 | import net.sf.json.xml.XMLSerializer; |
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38 | |
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39 | |
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40 | import org.apache.commons.io.IOUtils; |
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41 | import org.apache.commons.lang.StringEscapeUtils; |
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42 | import org.apache.struts2.interceptor.ServletRequestAware; |
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43 | import org.w3c.dom.Document; |
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44 | import org.w3c.dom.Element; |
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45 | import org.w3c.dom.Node; |
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46 | import org.xml.sax.InputSource; |
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47 | import org.xml.sax.SAXException; |
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48 | |
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49 | import com.opensymphony.xwork2.ActionSupport; |
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50 | |
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51 | import eu.clarin.cmdi.mdservice.model.Diagnostic; |
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52 | import eu.clarin.cmdi.mdservice.model.Diagnostics; |
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53 | |
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54 | |
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55 | public class SRUProxyAction extends GenericProxyAction//ActionSupport |
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56 | //implements ServletRequestAware |
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57 | { |
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58 | |
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59 | private static final long serialVersionUID = 1L; |
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60 | |
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61 | private Diagnostics diagnostics; |
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62 | |
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63 | /** |
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64 | * Properties to be filled by Struts with according request-parameters |
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65 | */ |
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66 | private String q; |
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67 | private String version; |
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68 | private String operation; |
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69 | private String query; |
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70 | private String scanClause; |
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71 | private int startRecord; |
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72 | private int maximumRecords; |
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73 | private String recordPacking; |
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74 | private String recordSchema; |
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75 | private String recordXPath; |
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76 | private int resultSetTTL; |
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77 | private String sortKeys; |
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78 | private String stylesheet; |
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79 | private String x_cmd_repository; |
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80 | private String x_cmd_collections; |
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81 | |
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82 | private MDRepoProxyAction mdrepoproxyaction; |
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83 | private TermsProxyAction termsproxyaction; |
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84 | //private InputStream resultStream; |
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85 | //private HttpServletRequest request; |
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86 | |
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87 | private static int OP_SEARCHRETRIEVE = 1; |
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88 | private static int OP_EXPLAIN = 2; |
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89 | private static int OP_SCAN = 3; |
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90 | |
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91 | //TODO cache after analysis |
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92 | @Override |
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93 | public String getCache() { |
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94 | return Cache.SKIP; |
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95 | } |
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96 | |
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97 | private final static HashMap<String,String> hash_operations = new HashMap<String,String>(); |
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98 | static |
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99 | { |
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100 | hash_operations.put("searchRetrieve", "recordset"); |
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101 | hash_operations.put("explain", "model"); /* could be terms*/ |
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102 | hash_operations.put("scan", "values"); |
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103 | } |
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104 | |
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105 | private final static HashMap<String,Integer> operation_code = new HashMap<String,Integer>(); |
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106 | static |
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107 | { |
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108 | operation_code.put("searchRetrieve", OP_SEARCHRETRIEVE); |
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109 | operation_code.put("explain", OP_EXPLAIN); |
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110 | operation_code.put("scan", OP_SCAN); |
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111 | } |
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112 | |
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113 | public SRUProxyAction(){ |
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114 | super(); |
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115 | initialize(); |
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116 | } |
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117 | |
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118 | protected void initialize(){ |
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119 | //repository = 1; |
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120 | this.startRecord = 1; |
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121 | this.maximumRecords = 50; |
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122 | } |
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123 | |
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124 | /*@Override |
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125 | public void setServletRequest(HttpServletRequest arg0) { |
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126 | request = arg0; |
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127 | } |
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128 | |
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129 | public HttpServletRequest getServletRequest() { |
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130 | return request; |
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131 | } |
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132 | */ |
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133 | public Diagnostics getDiagnostics(){ |
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134 | return this.diagnostics; |
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135 | } |
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136 | |
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137 | public void setDiagnostics(Diagnostics diagnostics){ |
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138 | this.diagnostics = diagnostics; |
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139 | } |
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140 | |
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141 | |
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142 | public String getQ() { |
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143 | return q; |
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144 | } |
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145 | |
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146 | public void setQ(String q) { |
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147 | this.q = q; |
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148 | } |
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149 | /* |
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150 | public InputStream getResultStream() { |
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151 | return resultStream; |
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152 | } |
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153 | public void setResultStream(InputStream _resultStream){ |
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154 | resultStream = _resultStream; |
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155 | } |
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156 | */ |
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157 | |
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158 | public String getVersion() { |
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159 | return version; |
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160 | } |
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161 | |
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162 | public void setVersion(String version) { |
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163 | this.version = version; |
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164 | } |
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165 | |
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166 | public String getOperation() { |
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167 | return operation; |
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168 | } |
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169 | |
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170 | public void setOperation(String operation) { |
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171 | this.operation = operation; |
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172 | } |
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173 | |
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174 | public String getQuery() { |
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175 | return query; |
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176 | } |
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177 | |
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178 | public void setQuery(String query) { |
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179 | this.query = query; |
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180 | } |
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181 | |
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182 | public String getScanClause() { |
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183 | return scanClause; |
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184 | } |
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185 | |
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186 | public void setScanClause(String scanClause) { |
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187 | this.scanClause = scanClause; |
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188 | } |
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189 | |
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190 | |
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191 | public int getStartRecord() { |
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192 | return startRecord; |
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193 | } |
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194 | |
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195 | public void setStartRecord(int startRecord) { |
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196 | this.startRecord = startRecord; |
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197 | } |
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198 | public int getMaximumRecords() { |
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199 | return maximumRecords; |
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200 | } |
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201 | |
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202 | public void setMaximumRecords(int maximumRecords) { |
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203 | this.maximumRecords = maximumRecords; |
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204 | } |
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205 | |
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206 | public String getRecordPacking() { |
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207 | return recordPacking; |
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208 | } |
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209 | |
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210 | public void setRecordPacking(String recordPacking) { |
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211 | this.recordPacking = recordPacking; |
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212 | } |
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213 | |
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214 | public String getRecordSchema() { |
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215 | return recordSchema; |
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216 | } |
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217 | |
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218 | public void setRecordSchema(String recordSchema) { |
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219 | this.recordSchema = recordSchema; |
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220 | } |
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221 | |
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222 | public String getRecordXPath() { |
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223 | return recordXPath; |
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224 | } |
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225 | |
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226 | public void setRecordXPath(String recordXPath) { |
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227 | this.recordXPath = recordXPath; |
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228 | } |
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229 | |
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230 | public int getResultSetTTL() { |
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231 | return resultSetTTL; |
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232 | } |
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233 | |
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234 | public void setResultSetTTL(int resultSetTTL) { |
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235 | this.resultSetTTL = resultSetTTL; |
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236 | } |
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237 | |
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238 | public String getSortKeys() { |
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239 | return sortKeys; |
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240 | } |
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241 | |
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242 | public void setSortKeys(String sortKeys) { |
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243 | this.sortKeys = sortKeys; |
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244 | } |
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245 | |
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246 | public String getStylesheet() { |
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247 | return stylesheet; |
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248 | } |
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249 | |
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250 | public void setStylesheet(String stylesheet) { |
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251 | this.stylesheet = stylesheet; |
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252 | } |
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253 | |
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254 | public String getX_cmd_repository(){ |
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255 | return x_cmd_repository; |
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256 | } |
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257 | |
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258 | public void setX_cmd_repository(String x_cmd_repository){ |
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259 | this.x_cmd_repository = x_cmd_repository; |
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260 | } |
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261 | |
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262 | public String getX_cmd_collections(){ |
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263 | return x_cmd_collections; |
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264 | } |
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265 | |
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266 | public void setX_cmd_collections(String x_cmd_collections){ |
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267 | this.x_cmd_collections = x_cmd_collections; |
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268 | } |
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269 | |
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270 | |
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271 | public String getDiagnosticStreamName() throws TransformerConfigurationException, UnsupportedEncodingException, ParserConfigurationException, TransformerException, TransformerFactoryConfigurationError{ |
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272 | this.setResultStream(this.Diagnostics().buildXMLStream()); |
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273 | return "resultStream"; |
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274 | } |
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275 | /** |
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276 | * primitive identification of the target-proxy |
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277 | * base for finding the right base_url in the props |
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278 | * subclass has to override with its specific proxykey |
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279 | * @return |
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280 | */ |
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281 | public String getProxyKey() { |
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282 | return ""; |
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283 | } |
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284 | |
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285 | @Override |
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286 | public String getBaseURI() { |
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287 | Admin.notifyUser("SRU-repositorypath:" + getRepositoryPath()); |
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288 | String uri = getRepositoryPath();//Admin.getConfig().getProperty(getProxyKey() + ".uri"); |
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289 | return uri; |
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290 | } |
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291 | |
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292 | public Diagnostics Diagnostics(){ |
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293 | if (this.diagnostics == null){ |
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294 | this.diagnostics = new Diagnostics(); |
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295 | } |
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296 | return this.diagnostics; |
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297 | } |
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298 | |
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299 | public void prepareOperation() throws UnsupportedEncodingException{ |
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300 | |
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301 | mdrepoproxyaction = new MDRepoProxyAction(); |
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302 | mdrepoproxyaction.setDiagnostics(diagnostics); |
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303 | mdrepoproxyaction.setActionkey(hash_operations.get(this.getOperation())); |
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304 | |
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305 | // set the SRU extern property in proxyaction |
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306 | if (this.getX_cmd_repository() != null ) { |
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307 | mdrepoproxyaction.setRepository(this.getX_cmd_repository()); |
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308 | //TODO\ |
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309 | if (mdrepoproxyaction.getBaseURI() == null) this.Diagnostics().Add(Diagnostic.UNSUPPORTED_PARAMETERVALUE, "Unknown repository." + getX_cmd_repository()); |
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310 | } |
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311 | |
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312 | if (operation.equals("searchRetrieve")){ |
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313 | |
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314 | //query |
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315 | mdrepoproxyaction.setSquery(""); |
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316 | if (this.query == null) { |
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317 | this.Diagnostics().Add(Diagnostic.MANDATORY_NOTSUPPLIED, "query"); |
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318 | //return -1; |
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319 | } |
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320 | mdrepoproxyaction.setQ(getQuery()); |
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321 | mdrepoproxyaction.setFormat("xml"); |
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322 | |
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323 | if ((this.startRecord < 0 ) ||((getServletRequest().getParameter("startRecord") != null)&&(getServletRequest().getParameter("startRecord").equals("0")))) { |
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324 | this.Diagnostics().Add(new Diagnostic(Diagnostic.UNSUPPORTED_PARAMETERVALUE, "startRecord must by grater than 0."));//,Diagnostic.NONFATALNONSURORGATE)); |
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325 | //mdrepoproxyaction.setStartItem("1"); |
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326 | } else { |
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327 | mdrepoproxyaction.setStartItem(Integer.toString(getStartRecord())); |
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328 | } |
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329 | |
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330 | if ((this.maximumRecords < 0 ) ||((getServletRequest().getParameter("maximumRecords") != null) && (getServletRequest().getParameter("maximumRecords").equals("0")))){ |
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331 | this.Diagnostics().Add(new Diagnostic(Diagnostic.UNSUPPORTED_PARAMETERVALUE, |
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332 | "maximumRecords must by greater than 0.")); |
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333 | } else { |
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334 | mdrepoproxyaction.setMaximumItems(Integer.toString(this.getMaximumRecords())); |
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335 | } |
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336 | |
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337 | if (this.getX_cmd_repository() != null ) { |
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338 | mdrepoproxyaction.setRepository(this.getX_cmd_repository()); |
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339 | //TODO\ |
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340 | if (mdrepoproxyaction.getBaseURI() == null) this.Diagnostics().Add(Diagnostic.UNSUPPORTED_PARAMETERVALUE, "Unknown repository." + getX_cmd_repository()); |
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341 | } |
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342 | if (this.getX_cmd_collections() != null ) { |
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343 | mdrepoproxyaction.setCollection(this.getX_cmd_collections()); |
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344 | } |
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345 | |
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346 | } else { |
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347 | if (operation.equals("explain") || operation == null){ |
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348 | Admin.notifyUser("explaining", "debug"); |
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349 | }else { |
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350 | if (operation.equals("scan")){ |
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351 | if (this.scanClause == null) { |
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352 | this.Diagnostics().Add(Diagnostic.MANDATORY_NOTSUPPLIED, "scanClause"); |
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353 | //return -1; |
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354 | } else{ |
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355 | if (this.scanClause.equals("cmd.Collections")){ |
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356 | |
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357 | } else { |
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358 | if (this.scanClause.equals("cmd.Repository")){ |
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359 | XMLSerializer xmlserializer = new XMLSerializer(); |
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360 | String xml = xmlserializer.write( mdrepoproxyaction.getRepositories() ); |
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361 | this.setResultStream(new ByteArrayInputStream(xml.getBytes("UTF-8"))); |
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362 | |
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363 | } else { |
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364 | |
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365 | } |
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366 | } |
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367 | } |
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368 | }else { |
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369 | this.Diagnostics().Add(Diagnostic.UNSUPPOERTED_OPERATION, "Only searchRetrieve,explain scan supported."); } |
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370 | } |
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371 | } |
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372 | } |
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373 | |
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374 | public void sru2MD() throws UnsupportedEncodingException{ |
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375 | // special handling of parameter setting, x-cmd-... not alowed in java |
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376 | this.setX_cmd_collections(getServletRequest().getParameter("x-cmd-collections")); |
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377 | |
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378 | // root call own SRU SERVER |
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379 | //operation |
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380 | if (operation.equals("explain") || operation == null){ |
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381 | // TODO: version param is mandatory for explain as well, but for root-request not! |
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382 | //explain |
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383 | termsproxyaction = new TermsProxyAction(); |
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384 | termsproxyaction.setDiagnostics(diagnostics); |
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385 | termsproxyaction.setActionkey("terms"); |
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386 | |
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387 | termsproxyaction.setQ("all"); |
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388 | termsproxyaction.setFormat("sru-explain"); |
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389 | |
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390 | //return -1; |
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391 | } else { |
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392 | //version |
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393 | if (this.version == null) { |
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394 | this.Diagnostics().Add(Diagnostic.MANDATORY_NOTSUPPLIED, "version"); |
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395 | //return -1; |
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396 | } else { |
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397 | if (!version.equals("1.2")) { |
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398 | this.Diagnostics().Add(Diagnostic.UNSUPPORTED_VERSION, "Version 1.2 supported."); |
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399 | //return -1; |
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400 | } |
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401 | } |
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402 | |
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403 | prepareOperation(); |
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404 | } |
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405 | |
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406 | } |
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407 | |
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408 | public void prepareMD() throws Exception{ |
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409 | sru2MD(); |
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410 | if (Diagnostics().Accepted()){ |
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411 | // root-explain |
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412 | if (this.termsproxyaction != null) { |
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413 | if (this.termsproxyaction.execute() == SUCCESS){ |
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414 | this.setResultStream(this.termsproxyaction.getResultStream()); |
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415 | //return SUCCESS; |
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416 | } |
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417 | } else { |
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418 | //TODO diagnostic |
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419 | if (this.mdrepoproxyaction.getTargetRequest() == null) { |
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420 | Diagnostics().Add(Diagnostic.QUERYSYNTAXERROR); |
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421 | //return ERROR; |
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422 | } |
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423 | if (this.mdrepoproxyaction.execute() == SUCCESS){ |
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424 | this.setResultStream(this.mdrepoproxyaction.getResultStream()); |
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425 | postprocess(); |
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426 | //return SUCCESS; |
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427 | } |
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428 | } |
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429 | } |
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430 | //return ERROR; |
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431 | } |
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432 | |
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433 | public static String inputStreamAsString(InputStream stream) |
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434 | throws IOException { |
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435 | BufferedReader br = new BufferedReader(new InputStreamReader(stream)); |
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436 | StringBuilder sb = new StringBuilder(); |
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437 | String line = null; |
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438 | |
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439 | while ((line = br.readLine()) != null) { |
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440 | sb.append(line + "\n"); |
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441 | } |
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442 | |
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443 | br.close(); |
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444 | return sb.toString(); |
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445 | } |
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446 | |
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447 | public static Document newDocumentFromInputStream(InputStream in) { |
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448 | DocumentBuilderFactory factory = null; |
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449 | DocumentBuilder builder = null; |
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450 | Document ret = null; |
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451 | |
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452 | try { |
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453 | factory = DocumentBuilderFactory.newInstance(); |
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454 | builder = factory.newDocumentBuilder(); |
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455 | } catch (ParserConfigurationException e) { |
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456 | e.printStackTrace(); |
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457 | } |
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458 | |
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459 | try { |
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460 | ret = builder.parse(new InputSource(in)); |
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461 | } catch (SAXException e) { |
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462 | e.printStackTrace(); |
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463 | } catch (IOException e) { |
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464 | e.printStackTrace(); |
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465 | } |
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466 | return ret; |
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467 | } |
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468 | |
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469 | |
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470 | public void postprocess() throws TransformerConfigurationException, UnsupportedEncodingException, ParserConfigurationException, TransformerException, TransformerFactoryConfigurationError{ |
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471 | //recordPacking |
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472 | if (this.getRecordPacking() != null){ |
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473 | if (this.getRecordPacking().toLowerCase().equals("string")){ |
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474 | try { |
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475 | this.setResultStream(IOUtils.toInputStream(StringEscapeUtils.escapeXml(inputStreamAsString(this.getResultStream())))); |
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476 | } catch (IOException e) { |
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477 | // TODO Auto-generated catch block |
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478 | e.printStackTrace(); |
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479 | } |
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480 | |
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481 | } |
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482 | } |
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483 | |
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484 | // add diagnostics |
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485 | if (Diagnostics().Exists()){ |
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486 | Document doc = newDocumentFromInputStream(this.getResultStream()); |
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487 | Node r_element= doc.getElementsByTagName("searchRetrieveResponse").item(0); |
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488 | Document ddoc = Diagnostics().buildXMLDocument(); |
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489 | Node d_element= ddoc.getElementsByTagName("diagnostics").item(0); |
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490 | doc.adoptNode(d_element); |
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491 | r_element.appendChild(d_element); |
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492 | DOMSource source = new DOMSource(doc); |
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493 | StringWriter xmlAsWriter = new StringWriter(); |
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494 | StreamResult result = new StreamResult(xmlAsWriter); |
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495 | TransformerFactory.newInstance().newTransformer().transform(source, result); |
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496 | this.setResultStream(new ByteArrayInputStream(xmlAsWriter.toString().getBytes("UTF-8"))); |
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497 | } |
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498 | } |
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499 | |
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500 | @Override |
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501 | public URL getTargetRequest() throws IOException { |
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502 | String requestURI = ""; |
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503 | URL targetURL; |
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504 | |
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505 | if (this.getBaseURI() == null){ |
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506 | requestURI = this.getX_cmd_repository(); |
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507 | } else { |
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508 | requestURI = this.getBaseURI(); |
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509 | } |
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510 | //TODO params |
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511 | Set set = getServletRequest().getParameterMap().entrySet(); |
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512 | Iterator i = set.iterator(); |
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513 | String params = ""; |
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514 | while(i.hasNext()){ |
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515 | Map.Entry me = (Map.Entry)i.next(); |
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516 | if (!(me.getKey().equals("x-cmd-repository") || me.getKey().equals("x-cmd-collections"))){ |
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517 | params = params + "&" + me.getKey() + "=" + ((String[])me.getValue())[0]; |
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518 | } |
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519 | } |
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520 | params = params.substring(1); |
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521 | targetURL = new URL(requestURI + "?" + params); |
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522 | return targetURL; |
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523 | } |
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524 | |
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525 | @Override |
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526 | public void prepare() throws Exception{ |
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527 | this.setX_cmd_repository(getServletRequest().getParameter("x-cmd-repository")); |
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528 | this.setRepository(this.getX_cmd_repository()); |
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529 | //TODO xsl usage according particular repositories ? |
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530 | //this.setActionkey("recordset"); |
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531 | this.setFormat("xml"); |
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532 | |
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533 | //extern SRU repository |
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534 | if (this.isSRURepository() || this.getBaseURI() == null){ |
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535 | super.prepare(); |
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536 | } |
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537 | else { |
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538 | prepareMD(); |
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539 | } |
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540 | |
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541 | } |
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542 | /** |
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543 | * default Action method |
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544 | */ |
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545 | /* |
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546 | public String execute() throws Exception { |
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547 | this.setX_cmd_repository(getServletRequest().getParameter("x-cmd-repository")); |
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548 | //check if extern SRU repository |
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549 | if (this.getX_cmd_repository() != null){ |
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550 | MDRepoProxyAction a = new MDRepoProxyAction(); |
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551 | a.setRepository(this.getX_cmd_repository()); |
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552 | // direct SRU - URL |
---|
553 | if (a.isSRURepository() || (a.getBaseURI() == null)){ |
---|
554 | String requestURL = ""; |
---|
555 | if (a.getBaseURI() == null){ |
---|
556 | requestURL = this.getX_cmd_repository(); |
---|
557 | } else { |
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558 | requestURL = a.getBaseURI(); |
---|
559 | } |
---|
560 | Set set = getServletRequest().getParameterMap().entrySet(); |
---|
561 | Iterator i = set.iterator(); |
---|
562 | String params = ""; |
---|
563 | while(i.hasNext()){ |
---|
564 | Map.Entry me = (Map.Entry)i.next(); |
---|
565 | params = params + "&" + me.getKey() + "=" + ((String[])me.getValue())[0]; |
---|
566 | } |
---|
567 | params = params.substring(1); |
---|
568 | URL url = new URL(requestURL + "?" + params); |
---|
569 | //getServletRequest().getRequestURL() |
---|
570 | resultStream = url.openStream();//getServletRequest().getRequestURL().openStream(); |
---|
571 | return SUCCESS; |
---|
572 | } |
---|
573 | } |
---|
574 | prepare(); |
---|
575 | if (Diagnostics().Accepted()){ |
---|
576 | // root-explain |
---|
577 | if (this.termsproxyaction != null) { |
---|
578 | if (this.termsproxyaction.execute() == SUCCESS){ |
---|
579 | resultStream = this.termsproxyaction.getResultStream(); |
---|
580 | return SUCCESS; |
---|
581 | } |
---|
582 | } else { |
---|
583 | //TODO diagnostic |
---|
584 | if (this.mdrepoproxyaction.getTargetRequest() == null) { |
---|
585 | Diagnostics().Add(Diagnostic.QUERYSYNTAXERROR); |
---|
586 | return ERROR; |
---|
587 | } |
---|
588 | if (this.mdrepoproxyaction.execute() == SUCCESS){ |
---|
589 | resultStream = this.mdrepoproxyaction.getResultStream(); |
---|
590 | postprocess(); |
---|
591 | return SUCCESS; |
---|
592 | } |
---|
593 | } |
---|
594 | } |
---|
595 | return ERROR; |
---|
596 | } |
---|
597 | */ |
---|
598 | |
---|
599 | } |
---|