1 | package eu.clarin.cmdi.mdservice.model; |
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2 | |
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3 | /** |
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4 | * The main model class, carrying users_query |
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5 | * able to parse and transform the user-string |
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6 | * and execute the query, ie issue appropriate request on the MDRepository |
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7 | * getting the url-wording right from MDRepositoryProxy |
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8 | * |
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9 | * At the moment just responsible for querying MDRepository |
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10 | * perhaps unify approach for other proxies - subtyping this Class |
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11 | */ |
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12 | |
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13 | import java.io.IOException; |
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14 | import java.net.MalformedURLException; |
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15 | import java.net.URL; |
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16 | |
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17 | import javax.xml.parsers.DocumentBuilder; |
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18 | import javax.xml.parsers.DocumentBuilderFactory; |
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19 | |
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20 | import org.w3c.dom.Document; |
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21 | import org.z3950.zing.cql.CQLNode; |
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22 | import org.z3950.zing.cql.CQLParseException; |
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23 | import org.z3950.zing.cql.CQLParser; |
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24 | |
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25 | import eu.clarin.cmdi.mdservice.action.Admin; |
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26 | import eu.clarin.cmdi.mdservice.action.MDTransformer; |
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27 | |
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28 | public class Query { |
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29 | public static String COLLECTIONS = "collections"; |
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30 | public static String COLUMNS = "columns"; |
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31 | public static String MODEL = "model"; |
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32 | public static String RECORDSET = "recordset"; |
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33 | public static String RECORD = "record"; |
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34 | |
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35 | public static String PARSED = "parsed"; |
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36 | public static String PARSEERROR = "parseerror"; |
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37 | |
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38 | private String type; |
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39 | /** |
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40 | * meant a target url/service, allowing querying different services on per query basis |
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41 | * not used yet |
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42 | */ |
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43 | private String target; |
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44 | |
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45 | private URL targetRequest; |
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46 | private String syntax = "cql"; /* cql, cmdIndex, xpath */ |
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47 | private String squery_string; |
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48 | private String query_string; |
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49 | private String full_query_string; |
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50 | private CQLNode query_cql; |
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51 | private String msg; |
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52 | /** |
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53 | * temporary default; |
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54 | */ |
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55 | private String collection=""; |
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56 | private String columns="Id,name"; |
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57 | private String startRecord = "1"; |
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58 | private String maximumRecords = "50"; |
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59 | private String squery = null; |
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60 | private int maxdepth=1; |
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61 | |
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62 | /** |
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63 | * reference to the result-object |
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64 | */ |
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65 | private Result result = new Result(this); |
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66 | |
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67 | |
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68 | public Query(String squeryString, String queryString) { |
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69 | this(squeryString, queryString, MODEL); |
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70 | } |
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71 | |
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72 | /** |
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73 | * main constructor, with user's querystring and type of the query, and context-collection (at the moment just one) |
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74 | * @param queryString |
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75 | * @param type |
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76 | * @param collection |
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77 | */ |
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78 | |
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79 | public Query(String squeryString,String queryString, String type, String collection, String columns) { |
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80 | this.type =type; |
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81 | setFullQueryString(squeryString, queryString); |
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82 | setCollection(collection); |
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83 | setColumns(columns); |
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84 | } |
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85 | |
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86 | /** |
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87 | * main constructor, with user's querystring and type of the query, and context-collection (at the moment just one) |
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88 | * @param queryString |
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89 | * @param type |
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90 | * @param collection |
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91 | */ |
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92 | |
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93 | public Query(String squeryString, String queryString, String type, String collection) { |
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94 | this.type =type; |
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95 | setFullQueryString(squeryString, queryString); |
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96 | setCollection(collection); |
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97 | } |
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98 | |
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99 | /** |
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100 | * another constructor, with user's querystring and type of the query; |
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101 | * problematic not setting the collection! |
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102 | * @param queryString |
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103 | * @param type |
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104 | */ |
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105 | |
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106 | public Query(String squeryString, String queryString, String type) { |
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107 | this.type =type; |
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108 | if (squeryString == null)squeryString =""; |
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109 | setFullQueryString(squeryString, queryString); |
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110 | } |
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111 | |
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112 | public Boolean isStatus(String qstatus) { |
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113 | return (qstatus.equals(getStatus())); |
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114 | } |
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115 | |
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116 | public String getStatus() { |
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117 | if (type.equals(Query.RECORDSET) && query_cql== null && (full_query_string != "")) { |
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118 | return Query.PARSEERROR; |
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119 | } else { |
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120 | return Query.PARSED; |
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121 | } |
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122 | |
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123 | } |
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124 | |
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125 | public String getType() { |
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126 | return type; |
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127 | } |
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128 | |
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129 | public void setType(String type) { |
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130 | this.type = type; |
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131 | } |
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132 | |
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133 | public String getQueryString() { |
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134 | return query_string; |
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135 | } |
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136 | |
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137 | public void setFullQueryString(String squeryString, String queryString) { |
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138 | |
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139 | query_string=queryString; |
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140 | |
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141 | if (squeryString.trim().length() == 0){ |
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142 | squeryString = null; |
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143 | } |
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144 | if (queryString.trim().length() == 0){ |
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145 | queryString = null; |
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146 | } |
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147 | |
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148 | String squery = createsqueryString(squeryString); |
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149 | if (squery != null && queryString != null){ |
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150 | full_query_string = "(" + squery + " ) and (" + queryString + ")"; |
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151 | } else if (squery != null) { |
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152 | full_query_string = squery; |
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153 | } else if (queryString != null){ |
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154 | full_query_string = queryString; |
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155 | } else { |
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156 | full_query_string = ""; |
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157 | } |
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158 | Admin.notifyUser("QUERY.FULLQUERYSTRING:" + full_query_string); |
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159 | if (type.equals(RECORDSET) && (full_query_string.length() > 0)) { |
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160 | parse(); |
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161 | //preprocess(); |
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162 | } |
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163 | |
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164 | } |
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165 | |
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166 | public String getFullQueryString() { |
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167 | return full_query_string; |
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168 | } |
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169 | |
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170 | |
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171 | public void setCollection(String collection) { |
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172 | if (collection!=null) { |
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173 | this.collection = collection; |
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174 | } |
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175 | } |
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176 | |
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177 | public String getCollection() { |
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178 | return collection; |
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179 | } |
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180 | |
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181 | public String getColumns() { |
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182 | return columns; |
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183 | } |
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184 | |
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185 | public void setColumns(String columns) { |
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186 | if (columns!=null) { |
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187 | this.columns = columns; |
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188 | } |
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189 | } |
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190 | |
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191 | public String getSQuery() { |
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192 | return this.squery; |
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193 | } |
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194 | |
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195 | public void setSQuery(String squery) { |
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196 | if (squery!=null) { |
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197 | this.squery = squery; |
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198 | } |
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199 | } |
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200 | |
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201 | public String getStartRecord() { |
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202 | return startRecord; |
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203 | } |
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204 | |
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205 | public void setStartRecord(String startRecord) { |
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206 | if (startRecord!=null) { |
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207 | this.startRecord = startRecord; |
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208 | } |
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209 | } |
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210 | |
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211 | public String getMaximumRecords() { |
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212 | return maximumRecords; |
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213 | } |
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214 | |
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215 | public void setMaximumRecords(String maximumRecords) { |
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216 | if (maximumRecords!=null) { |
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217 | this.maximumRecords = maximumRecords; |
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218 | } |
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219 | } |
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220 | public void setMaxdepth(int maxdepth) { |
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221 | if (maxdepth > 0) { |
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222 | this.maxdepth = maxdepth; |
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223 | } |
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224 | } |
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225 | |
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226 | public int getMaxdepth() { |
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227 | return maxdepth; |
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228 | } |
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229 | |
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230 | public void setResult(Result result) { |
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231 | this.result = result; |
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232 | } |
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233 | |
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234 | |
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235 | public Result getResult() { |
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236 | return result; |
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237 | } |
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238 | |
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239 | public String getMsg() { |
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240 | return msg; |
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241 | } |
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242 | |
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243 | public void setMsg(String msg) { |
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244 | this.msg = msg; |
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245 | } |
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246 | |
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247 | // apply rules form squery |
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248 | public String createsqueryString (String _squery){ |
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249 | String sq = null; |
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250 | |
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251 | if (_squery !=null){ |
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252 | sq = "* any " + _squery; |
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253 | } |
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254 | |
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255 | return sq; |
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256 | } |
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257 | public static String getSimpleQueryString(String querystring) { |
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258 | String[] arr_and = querystring.split(" and "); |
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259 | String simple_form = ""; |
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260 | String simple_form_all = ""; |
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261 | String rel = ""; |
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262 | |
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263 | for( int i=0;i<arr_and.length;i++){ |
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264 | arr_and[i] = arr_and[i].trim(); |
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265 | String[] arr_or = arr_and[i].split(" or "); |
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266 | simple_form = ""; |
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267 | for( int j=0;j<arr_or.length;j++){ |
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268 | arr_or[j] = arr_or[j].trim(); |
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269 | while (arr_or[j].substring(0,1).equals("(") ) { |
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270 | arr_or[j] = arr_or[j].substring(1,arr_or[j].length()); |
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271 | arr_or[j] = arr_or[j].trim(); |
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272 | } |
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273 | while ( arr_or[j].substring(arr_or[j].length()-1,arr_or[j].length()).equals(")")){ |
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274 | arr_or[j] = arr_or[j].substring(0,arr_or[j].length()-1); |
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275 | arr_or[j] = arr_or[j].trim(); |
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276 | } |
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277 | if (j > 0) { |
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278 | rel = " or "; |
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279 | } else { |
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280 | rel = ""; |
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281 | } |
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282 | simple_form = simple_form + rel + arr_or[j]; |
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283 | } |
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284 | //Admin.notifyUser(simple_form); |
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285 | if (arr_or.length > 1){ |
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286 | simple_form = "(" + simple_form + ") "; |
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287 | } |
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288 | if (i > 0) { |
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289 | rel = " and "; |
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290 | } else { |
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291 | rel = ""; |
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292 | } |
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293 | simple_form_all = simple_form_all + rel + simple_form; |
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294 | |
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295 | } |
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296 | |
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297 | return simple_form_all; |
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298 | } |
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299 | /** |
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300 | * construct the URL-Param |
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301 | * @return |
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302 | * @throws MalformedURLException |
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303 | * TODO url-encode (especially the query-param) ! |
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304 | */ |
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305 | public String toURLParam() throws MalformedURLException { |
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306 | |
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307 | String targetRequest; |
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308 | |
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309 | if (type.equals(MODEL)) { |
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310 | targetRequest = toCMDIndex() + "&maxdepth=" + getMaxdepth() ; /* + "&maxdepth=" + getMaxdepth() ); "&collection=" + getCollection() + */ |
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311 | } else if (type.equals(RECORD)) { |
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312 | // 2010-07-11 this is just a hack, because url-encoding the handle acted strange |
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313 | //String corrid = getQueryString().replace('_', '/'); |
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314 | String corrid = getQueryString(); |
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315 | targetRequest = "//MdSelfLink[.='" + corrid + "']"; |
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316 | } else { |
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317 | if (query_cql == null){ |
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318 | targetRequest = "//*" + "&collection=" + getCollection(); |
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319 | } else { |
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320 | targetRequest = toXPath() + "&collection=" + getCollection(); |
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321 | } |
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322 | if ((startRecord != null) && (maximumRecords != null)) { |
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323 | targetRequest = targetRequest + "&startRecord=" + getStartRecord() + "&iend=" + getMaximumRecords(); |
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324 | } |
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325 | } |
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326 | |
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327 | return targetRequest; |
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328 | |
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329 | } |
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330 | |
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331 | /** |
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332 | * tries to parse the full_query_string according the CQL-syntax |
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333 | * if successful returns the root-node of the parse-tree |
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334 | */ |
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335 | public CQLNode parse() { |
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336 | |
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337 | try { |
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338 | CQLParser parser = new CQLParser(); |
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339 | query_cql = parser.parse(full_query_string); |
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340 | } |
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341 | catch (CQLParseException e) { |
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342 | // TODO better handling of failed parse |
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343 | setMsg("Query.ParseError-"+ e.getClass() + ": " + e.getMessage()); |
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344 | } catch (IOException e) { |
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345 | // TODO Auto-generated catch block |
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346 | e.printStackTrace(); |
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347 | } |
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348 | |
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349 | |
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350 | return query_cql; |
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351 | } |
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352 | |
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353 | /** |
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354 | */ |
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355 | public void preprocess() { |
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356 | |
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357 | try { |
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358 | Admin.notifyUser(toXCQL()); |
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359 | |
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360 | |
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361 | DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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362 | DocumentBuilder builder = factory.newDocumentBuilder(); |
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363 | Document doc = builder.parse(new org.xml.sax.InputSource(new java.io.StringReader(toXCQL()))); |
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364 | |
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365 | //Admin.notifyUser("document created"); |
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366 | SearchClauses searchclauses = new SearchClauses(doc); |
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367 | //do the processing |
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368 | searchclauses.process(); |
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369 | String xml_s = searchclauses.toXML(); |
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370 | |
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371 | //Admin.notifyUser("AAAA2:" + xml_s); |
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372 | } |
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373 | catch (Exception e) { |
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374 | e.printStackTrace(); |
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375 | } |
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376 | return; |
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377 | } |
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378 | |
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379 | |
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380 | /** |
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381 | * provides a xml-version of the query (if parsed successfully) |
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382 | * according to the XCQL-schema defined in the SRU/CQL standard |
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383 | * @return |
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384 | */ |
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385 | public String toXCQL() { |
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386 | return query_cql.toXCQL(0); |
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387 | } |
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388 | |
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389 | /** |
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390 | * provides a xpath version of the query, based on the XCQL-version, |
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391 | * applying a stylesheet on the XCQL-version |
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392 | * @return XPath-query |
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393 | */ |
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394 | public String toXPath() { |
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395 | MDTransformer.getMDTransformer().setParams(MDTransformer.createParamsMap("XCQL2XPATH")); |
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396 | return MDTransformer.getMDTransformer().transformXML(toXCQL()); |
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397 | } |
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398 | |
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399 | /** |
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400 | * if the query is just a path-like structure |
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401 | * "transforms" to cmdIndex-format, means replace('.', '/') ;) |
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402 | * @return |
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403 | */ |
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404 | public String toCMDIndex() { |
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405 | return query_string.replace('.', '/'); |
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406 | } |
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407 | |
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408 | /** |
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409 | * OBSOLETED! MDRepoProxyAction executes the request, Query only provides itself encoded |
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410 | * runs the query! by opening the stream on the targetService/URL |
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411 | * setting it as inputStream of the Result |
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412 | * @throws Exception |
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413 | */ |
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414 | /* public void execute() throws Exception { |
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415 | |
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416 | result.setInputStream(getTargetRequest().openStream()); |
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417 | |
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418 | } |
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419 | */ |
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420 | |
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421 | |
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422 | } |
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