1 | package eu.clarin.cmdi.mdservice.proxy; |
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2 | |
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3 | import java.io.BufferedReader; |
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4 | import java.io.IOException; |
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5 | import java.io.InputStream; |
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6 | import java.io.InputStreamReader; |
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7 | import java.net.URL; |
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8 | import java.util.HashMap; |
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9 | import java.util.Iterator; |
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10 | import java.util.Map; |
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11 | import java.util.Set; |
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12 | |
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13 | import javax.xml.parsers.DocumentBuilder; |
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14 | import javax.xml.parsers.DocumentBuilderFactory; |
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15 | import javax.xml.parsers.ParserConfigurationException; |
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16 | |
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17 | import org.apache.log4j.Logger; |
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18 | import org.w3c.dom.Document; |
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19 | import org.xml.sax.InputSource; |
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20 | import org.xml.sax.SAXException; |
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21 | |
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22 | import eu.clarin.cmdi.mdservice.model.Diagnostics; |
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23 | import eu.clarin.cmdi.mdservice.model.Query; |
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24 | import eu.clarin.cmdi.mdservice.model.WorkspaceProfile; |
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25 | |
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26 | |
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27 | public class SRUProxy extends RepoProxy |
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28 | //implements ServletRequestAware |
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29 | { |
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30 | |
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31 | private static final long serialVersionUID = 1L; |
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32 | |
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33 | private String proxy_key = "sru"; |
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34 | private static Logger log = Logger.getLogger("SRUProxy"); |
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35 | |
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36 | private Diagnostics diagnostics; |
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37 | |
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38 | |
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39 | /** |
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40 | * Properties to be filled by Struts with according request-parameters |
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41 | */ |
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42 | /* |
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43 | private String q; |
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44 | private String version; |
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45 | private String operation; |
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46 | private String query; |
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47 | private String scanClause; |
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48 | private int startRecord; |
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49 | private int maximumRecords; |
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50 | private String recordPacking; |
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51 | private String recordSchema; |
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52 | private String recordXPath; |
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53 | private int resultSetTTL; |
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54 | private String sortKeys; |
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55 | private String stylesheet; |
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56 | private String x_cmd_repository; |
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57 | private String x_cmd_collections; |
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58 | */ |
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59 | private Set paramSet; |
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60 | |
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61 | private static int OP_SEARCHRETRIEVE = 1; |
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62 | private static int OP_EXPLAIN = 2; |
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63 | private static int OP_SCAN = 3; |
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64 | |
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65 | |
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66 | |
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67 | |
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68 | private final static HashMap<String,String> hash_operations = new HashMap<String,String>(); |
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69 | static |
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70 | { |
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71 | hash_operations.put("searchRetrieve", "recordset"); |
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72 | hash_operations.put("explain", "model"); /* could be terms*/ |
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73 | hash_operations.put("scan", "values"); |
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74 | } |
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75 | |
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76 | private final static HashMap<String,Integer> operation_code = new HashMap<String,Integer>(); |
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77 | static |
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78 | { |
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79 | operation_code.put("searchRetrieve", OP_SEARCHRETRIEVE); |
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80 | operation_code.put("explain", OP_EXPLAIN); |
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81 | operation_code.put("scan", OP_SCAN); |
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82 | } |
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83 | |
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84 | public SRUProxy(){ |
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85 | super(); |
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86 | initialize(); |
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87 | } |
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88 | |
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89 | public SRUProxy(Query q){ |
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90 | setQuery(q); |
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91 | } |
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92 | |
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93 | protected void initialize(){ |
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94 | /* |
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95 | // TODO set SRU params |
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96 | // missing collections, columns... |
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97 | setOperation("searchRetrieve"); |
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98 | //TODO what version |
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99 | setVersion("1.2"); |
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100 | //setStartRecord(Integer.parseInt(getSourceAction().getStartItem())); |
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101 | //setMaximumRecords(Integer.parseInt(getSourceAction().getMaximumItems())); |
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102 | // This is probably bloedsinn: |
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103 | setX_cmd_repository(getSourceAction().getRepository()); |
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104 | setQuery(this.fullQueryString()); |
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105 | */ |
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106 | /* |
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107 | if (getServletRequest() != null){ |
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108 | this.setX_cmd_repository(getServletRequest().getParameter("x-cmd-repository")); |
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109 | this.setRepository(this.getX_cmd_repository()); |
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110 | paramSet = getServletRequest().getParameterMap().entrySet(); |
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111 | } |
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112 | */ |
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113 | } |
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114 | |
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115 | @Override |
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116 | public String getProxyKey() { |
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117 | return proxy_key; |
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118 | } |
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119 | |
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120 | /*@Override |
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121 | public void setServletRequest(HttpServletRequest arg0) { |
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122 | request = arg0; |
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123 | } |
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124 | |
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125 | public HttpServletRequest getServletRequest() { |
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126 | return request; |
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127 | } |
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128 | */ |
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129 | public Diagnostics getDiagnostics(){ |
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130 | return this.diagnostics; |
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131 | } |
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132 | |
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133 | public void setDiagnostics(Diagnostics diagnostics){ |
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134 | this.diagnostics = diagnostics; |
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135 | } |
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136 | |
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137 | /* |
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138 | public String getQ() { |
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139 | return q; |
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140 | } |
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141 | |
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142 | public void setQ(String q) { |
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143 | this.q = q; |
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144 | } |
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145 | */ |
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146 | /* |
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147 | public InputStream getResultStream() { |
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148 | return resultStream; |
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149 | } |
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150 | public void setResultStream(InputStream _resultStream){ |
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151 | resultStream = _resultStream; |
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152 | } |
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153 | */ |
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154 | /* |
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155 | public String getVersion() { |
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156 | return version; |
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157 | } |
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158 | |
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159 | public void setVersion(String version) { |
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160 | this.version = version; |
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161 | } |
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162 | |
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163 | public String getOperation() { |
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164 | return operation; |
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165 | } |
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166 | |
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167 | public void setOperation(String operation) { |
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168 | this.operation = operation; |
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169 | } |
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170 | |
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171 | public String getQuery() { |
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172 | return query; |
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173 | } |
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174 | |
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175 | public void setQuery(String query) { |
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176 | this.query = query; |
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177 | } |
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178 | |
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179 | public String getScanClause() { |
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180 | return scanClause; |
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181 | } |
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182 | |
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183 | public void setScanClause(String scanClause) { |
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184 | this.scanClause = scanClause; |
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185 | } |
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186 | |
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187 | |
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188 | public int getStartRecord() { |
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189 | return startRecord; |
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190 | } |
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191 | |
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192 | public void setStartRecord(int startRecord) { |
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193 | this.startRecord = startRecord; |
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194 | } |
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195 | public int getMaximumRecords() { |
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196 | return maximumRecords; |
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197 | } |
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198 | |
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199 | public void setMaximumRecords(int maximumRecords) { |
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200 | this.maximumRecords = maximumRecords; |
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201 | } |
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202 | |
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203 | public String getRecordPacking() { |
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204 | return recordPacking; |
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205 | } |
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206 | |
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207 | public void setRecordPacking(String recordPacking) { |
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208 | this.recordPacking = recordPacking; |
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209 | } |
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210 | |
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211 | public String getRecordSchema() { |
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212 | return recordSchema; |
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213 | } |
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214 | |
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215 | public void setRecordSchema(String recordSchema) { |
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216 | this.recordSchema = recordSchema; |
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217 | } |
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218 | |
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219 | public String getRecordXPath() { |
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220 | return recordXPath; |
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221 | } |
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222 | |
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223 | public void setRecordXPath(String recordXPath) { |
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224 | this.recordXPath = recordXPath; |
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225 | } |
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226 | |
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227 | public int getResultSetTTL() { |
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228 | return resultSetTTL; |
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229 | } |
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230 | |
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231 | public void setResultSetTTL(int resultSetTTL) { |
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232 | this.resultSetTTL = resultSetTTL; |
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233 | } |
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234 | |
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235 | public String getSortKeys() { |
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236 | return sortKeys; |
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237 | } |
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238 | |
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239 | public void setSortKeys(String sortKeys) { |
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240 | this.sortKeys = sortKeys; |
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241 | } |
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242 | |
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243 | public String getStylesheet() { |
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244 | return stylesheet; |
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245 | } |
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246 | |
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247 | public void setStylesheet(String stylesheet) { |
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248 | this.stylesheet = stylesheet; |
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249 | } |
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250 | |
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251 | public String getX_cmd_repository(){ |
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252 | return x_cmd_repository; |
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253 | } |
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254 | |
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255 | public void setX_cmd_repository(String x_cmd_repository){ |
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256 | this.x_cmd_repository = x_cmd_repository; |
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257 | } |
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258 | |
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259 | public String getX_cmd_collections(){ |
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260 | return x_cmd_collections; |
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261 | } |
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262 | |
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263 | public void setX_cmd_collections(String x_cmd_collections){ |
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264 | this.x_cmd_collections = x_cmd_collections; |
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265 | } |
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266 | */ |
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267 | |
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268 | @Override |
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269 | public String getBaseURI() { |
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270 | log.debug("SRU-repositorypath:" + WorkspaceProfile.getRepositoryPath(getSourceAction().getRepository())); |
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271 | String uri = WorkspaceProfile.getRepositoryPath(getSourceAction().getRepository());//Utils.getConfig().getProperty(getProxyKey() + ".uri"); |
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272 | return uri; |
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273 | } |
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274 | |
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275 | public Diagnostics Diagnostics(){ |
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276 | if (this.diagnostics == null){ |
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277 | this.diagnostics = new Diagnostics(); |
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278 | } |
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279 | return this.diagnostics; |
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280 | } |
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281 | /* |
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282 | public void prepareOperation() throws UnsupportedEncodingException{ |
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283 | |
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284 | mdrepoproxyaction = new MDRepoProxyAction(); |
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285 | mdrepoproxyaction.setDiagnostics(diagnostics); |
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286 | mdrepoproxyaction.setActionkey(hash_operations.get(this.getOperation())); |
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287 | |
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288 | // set the SRU extern property in proxyaction |
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289 | if (this.getX_cmd_repository() != null ) { |
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290 | mdrepoproxyaction.setRepository(this.getX_cmd_repository()); |
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291 | //TODO\ |
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292 | if (mdrepoproxyaction.getBaseURI() == null) this.Diagnostics().Add(Diagnostic.UNSUPPORTED_PARAMETERVALUE, "Unknown repository." + getX_cmd_repository()); |
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293 | } |
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294 | |
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295 | if (operation.equals("searchRetrieve")){ |
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296 | |
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297 | //query |
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298 | mdrepoproxyaction.setSquery(""); |
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299 | if (this.query == null) { |
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300 | this.Diagnostics().Add(Diagnostic.MANDATORY_NOTSUPPLIED, "query"); |
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301 | //return -1; |
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302 | } |
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303 | mdrepoproxyaction.setQ(getQuery()); |
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304 | mdrepoproxyaction.setFormat("xml"); |
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305 | |
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306 | if ((this.startRecord < 0 ) ||((getServletRequest().getParameter("startRecord") != null)&&(getServletRequest().getParameter("startRecord").equals("0")))) { |
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307 | this.Diagnostics().Add(new Diagnostic(Diagnostic.UNSUPPORTED_PARAMETERVALUE, "startRecord must by grater than 0."));//,Diagnostic.NONFATALNONSURORGATE)); |
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308 | //mdrepoproxyaction.setStartItem("1"); |
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309 | } else { |
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310 | mdrepoproxyaction.setStartItem(Integer.toString(getStartRecord())); |
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311 | } |
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312 | |
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313 | if ((this.maximumRecords < 0 ) ||((getServletRequest().getParameter("maximumRecords") != null) && (getServletRequest().getParameter("maximumRecords").equals("0")))){ |
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314 | this.Diagnostics().Add(new Diagnostic(Diagnostic.UNSUPPORTED_PARAMETERVALUE, |
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315 | "maximumRecords must by greater than 0.")); |
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316 | } else { |
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317 | mdrepoproxyaction.setMaximumItems(Integer.toString(this.getMaximumRecords())); |
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318 | } |
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319 | |
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320 | if (this.getX_cmd_repository() != null ) { |
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321 | mdrepoproxyaction.setRepository(this.getX_cmd_repository()); |
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322 | //TODO\ |
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323 | if (mdrepoproxyaction.getBaseURI() == null) this.Diagnostics().Add(Diagnostic.UNSUPPORTED_PARAMETERVALUE, "Unknown repository." + getX_cmd_repository()); |
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324 | } |
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325 | if (this.getX_cmd_collections() != null ) { |
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326 | mdrepoproxyaction.setCollection(this.getX_cmd_collections()); |
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327 | } |
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328 | |
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329 | } else { |
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330 | if (operation.equals("explain") || operation == null){ |
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331 | log.debug("explaining", "debug"); |
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332 | }else { |
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333 | if (operation.equals("scan")){ |
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334 | if (this.scanClause == null) { |
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335 | this.Diagnostics().Add(Diagnostic.MANDATORY_NOTSUPPLIED, "scanClause"); |
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336 | //return -1; |
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337 | } else{ |
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338 | if (this.scanClause.equals("cmd.Collections")){ |
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339 | |
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340 | } else { |
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341 | if (this.scanClause.equals("cmd.Repository")){ |
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342 | XMLSerializer xmlserializer = new XMLSerializer(); |
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343 | String xml = xmlserializer.write( WorkspaceProfile.getRepositories());//mdrepoproxyaction.getRepositories() ); |
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344 | this.setResultStream(new ByteArrayInputStream(xml.getBytes("UTF-8"))); |
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345 | |
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346 | } else { |
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347 | |
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348 | } |
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349 | } |
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350 | } |
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351 | }else { |
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352 | this.Diagnostics().Add(Diagnostic.UNSUPPOERTED_OPERATION, "Only searchRetrieve,explain scan supported."); } |
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353 | } |
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354 | } |
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355 | } |
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356 | |
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357 | public void sru2MD() throws UnsupportedEncodingException{ |
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358 | // special handling of parameter setting, x-cmd-... not alowed in java |
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359 | this.setX_cmd_collections(getServletRequest().getParameter("x-cmd-collections")); |
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360 | // root call own SRU SERVER |
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361 | //operation |
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362 | if (operation.equals("explain") || operation == null){ |
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363 | // TODO: version param is mandatory for explain as well, but for root-request not! |
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364 | //explain |
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365 | termsproxyaction = new TermsProxyAction(); |
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366 | termsproxyaction.setDiagnostics(diagnostics); |
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367 | termsproxyaction.setActionkey("terms"); |
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368 | |
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369 | termsproxyaction.setQ("all"); |
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370 | termsproxyaction.setFormat("sru-explain"); |
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371 | |
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372 | //return -1; |
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373 | } else { |
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374 | //version |
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375 | if (this.version == null) { |
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376 | this.Diagnostics().Add(Diagnostic.MANDATORY_NOTSUPPLIED, "version"); |
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377 | //return -1; |
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378 | } else { |
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379 | if (!version.equals("1.2")) { |
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380 | this.Diagnostics().Add(Diagnostic.UNSUPPORTED_VERSION, "Version 1.2 supported."); |
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381 | //return -1; |
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382 | } |
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383 | } |
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384 | |
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385 | prepareOperation(); |
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386 | } |
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387 | |
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388 | } |
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389 | |
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390 | public void prepareMD() throws Exception{ |
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391 | sru2MD(); |
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392 | if (Diagnostics().Accepted()){ |
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393 | // root-explain |
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394 | if (this.termsproxyaction != null) { |
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395 | if (this.termsproxyaction.execute() == SUCCESS){ |
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396 | this.setResultStream(this.termsproxyaction.getResultStream()); |
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397 | //return SUCCESS; |
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398 | } |
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399 | } else { |
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400 | //TODO diagnostic |
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401 | if (this.mdrepoproxyaction.getTargetRequest() == null) { |
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402 | Diagnostics().Add(Diagnostic.QUERYSYNTAXERROR); |
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403 | //return ERROR; |
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404 | } |
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405 | if (this.mdrepoproxyaction.execute() == SUCCESS){ |
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406 | this.setResultStream(this.mdrepoproxyaction.getResultStream()); |
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407 | postprocess(); |
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408 | //return SUCCESS; |
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409 | } |
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410 | } |
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411 | } |
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412 | //return ERROR; |
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413 | } |
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414 | */ |
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415 | |
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416 | /** TODO: move to Utils |
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417 | * |
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418 | * @param stream |
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419 | * @return |
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420 | * @throws IOException |
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421 | */ |
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422 | public static String inputStreamAsString(InputStream stream) |
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423 | throws IOException { |
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424 | BufferedReader br = new BufferedReader(new InputStreamReader(stream)); |
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425 | StringBuilder sb = new StringBuilder(); |
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426 | String line = null; |
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427 | |
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428 | while ((line = br.readLine()) != null) { |
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429 | sb.append(line + "\n"); |
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430 | } |
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431 | |
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432 | br.close(); |
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433 | return sb.toString(); |
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434 | } |
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435 | |
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436 | public static Document newDocumentFromInputStream(InputStream in) { |
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437 | DocumentBuilderFactory factory = null; |
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438 | DocumentBuilder builder = null; |
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439 | Document ret = null; |
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440 | |
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441 | try { |
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442 | factory = DocumentBuilderFactory.newInstance(); |
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443 | builder = factory.newDocumentBuilder(); |
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444 | } catch (ParserConfigurationException e) { |
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445 | e.printStackTrace(); |
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446 | } |
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447 | |
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448 | try { |
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449 | ret = builder.parse(new InputSource(in)); |
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450 | } catch (SAXException e) { |
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451 | e.printStackTrace(); |
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452 | } catch (IOException e) { |
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453 | e.printStackTrace(); |
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454 | } |
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455 | return ret; |
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456 | } |
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457 | |
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458 | /* |
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459 | public void postprocess() throws TransformerConfigurationException, UnsupportedEncodingException, ParserConfigurationException, TransformerException, TransformerFactoryConfigurationError{ |
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460 | //recordPacking |
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461 | if (this.getRecordPacking() != null){ |
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462 | if (this.getRecordPacking().toLowerCase().equals("string")){ |
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463 | try { |
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464 | this.setResultStream(IOUtils.toInputStream(StringEscapeUtils.escapeXml(inputStreamAsString(this.getResultStream())))); |
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465 | } catch (IOException e) { |
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466 | // TODO Auto-generated catch block |
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467 | e.printStackTrace(); |
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468 | } |
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469 | |
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470 | } |
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471 | } |
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472 | |
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473 | // add diagnostics |
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474 | if (Diagnostics().Exists()){ |
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475 | Document doc = newDocumentFromInputStream(this.getResultStream()); |
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476 | Node r_element= doc.getElementsByTagName("searchRetrieveResponse").item(0); |
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477 | Document ddoc = Diagnostics().buildXMLDocument(); |
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478 | Node d_element= ddoc.getElementsByTagName("diagnostics").item(0); |
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479 | doc.adoptNode(d_element); |
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480 | r_element.appendChild(d_element); |
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481 | DOMSource source = new DOMSource(doc); |
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482 | StringWriter xmlAsWriter = new StringWriter(); |
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483 | StreamResult result = new StreamResult(xmlAsWriter); |
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484 | TransformerFactory.newInstance().newTransformer().transform(source, result); |
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485 | this.setResultStream(new ByteArrayInputStream(xmlAsWriter.toString().getBytes("UTF-8"))); |
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486 | } |
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487 | } |
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488 | */ |
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489 | //TODO create query + query.toURLParams ? |
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490 | public String createURLParams(){ |
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491 | String params = ""; |
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492 | |
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493 | //TODO params |
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494 | if (paramSet == null){ |
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495 | if (!(getParam("operation") == null)){ |
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496 | params = params + "operation=" + getParam("operation"); |
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497 | } |
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498 | if (!(getParam("version") == null)){ |
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499 | params = params + "&version=" + getParam("version"); |
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500 | } |
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501 | if (!(getParam("query") == null)){ |
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502 | params = params + "&query=" + getParam("query"); |
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503 | } |
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504 | if (Integer.parseInt(getParam("startRecord")) > 0){ |
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505 | params = params + "&startRecord=" + String.valueOf(getParam("startRecord")); |
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506 | } |
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507 | if (Integer.parseInt(getParam("maximumRecords"))> 0){ |
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508 | params = params + "&numRecords=" + String.valueOf(getParam("maximumRecords")); |
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509 | } |
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510 | } else { |
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511 | Iterator i = paramSet.iterator(); |
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512 | params = ""; |
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513 | while(i.hasNext()){ |
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514 | Map.Entry me = (Map.Entry)i.next(); |
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515 | if (!(me.getKey().equals("x-cmd-repository") || me.getKey().equals("x-cmd-collections"))){ |
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516 | params = params + "&" + me.getKey() + "=" + ((String[])me.getValue())[0]; |
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517 | } |
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518 | } |
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519 | params = params.substring(1); |
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520 | |
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521 | } |
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522 | |
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523 | return params; |
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524 | } |
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525 | @Override |
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526 | public URL getTargetRequest() throws IOException { |
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527 | String requestURI = ""; |
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528 | URL targetURL; |
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529 | |
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530 | if (this.getBaseURI() == null){ |
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531 | requestURI = getParam("x_cmd_repository");//this.getX_cmd_repository(); |
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532 | } else { |
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533 | requestURI = this.getBaseURI(); |
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534 | } |
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535 | |
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536 | targetURL = new URL(requestURI + "?" + createURLParams()); |
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537 | return targetURL; |
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538 | } |
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539 | |
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540 | |
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541 | /* |
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542 | @Override |
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543 | public void prepare() throws Exception{ |
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544 | //this.setX_cmd_repository(getServletRequest().getParameter("x-cmd-repository")); |
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545 | //this.setRepository(this.getX_cmd_repository()); |
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546 | //TODO xsl usage according particular repositories ? |
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547 | //this.setActionkey("sru"); |
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548 | //this.setFormat("xml"); |
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549 | |
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550 | //extern SRU repository |
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551 | if (WorkspaceProfile.isSRURepository(getRepository()) || this.getBaseURI() == null){ |
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552 | super.prepare(); |
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553 | } |
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554 | else { |
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555 | prepareMD(); |
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556 | } |
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557 | |
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558 | } |
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559 | */ |
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560 | |
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561 | } |
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