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 | 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.xml.parsers.DocumentBuilder; |
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22 | import javax.xml.parsers.DocumentBuilderFactory; |
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23 | |
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24 | import org.apache.log4j.Logger; |
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25 | import org.w3c.dom.Document; |
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26 | import org.z3950.zing.cql.CQLNode; |
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27 | import org.z3950.zing.cql.CQLParseException; |
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28 | import org.z3950.zing.cql.CQLParser; |
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29 | |
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30 | import eu.clarin.cmdi.mdservice.internal.Utils; |
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31 | import eu.clarin.cmdi.mdservice.internal.MDTransformer; |
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32 | import eu.clarin.cmdi.mdservice.internal.NoStylesheetException; |
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33 | |
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34 | public class Query { |
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35 | |
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36 | public static Logger log = Logger.getLogger("Query"); |
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37 | |
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38 | public static String COLLECTION = "collection"; |
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39 | public static String COLUMNS = "columns"; |
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40 | public static String MODEL = "model"; |
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41 | public static String VALUES = "values"; |
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42 | public static String RECORDSET = "search"; |
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43 | public static String RECORD = "record"; |
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44 | public static String SRUEXTERN = "sruextern"; |
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45 | public static String SRURECORDSET = "srurecordset"; |
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46 | public static String FCSRECORDSET = "fcsrecordset"; |
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47 | |
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48 | public static String PARSED = "parsed"; |
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49 | public static String UNPARSED = "unparsed"; |
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50 | public static String PARSEERROR = "parseerror"; |
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51 | |
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52 | private String type; |
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53 | |
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54 | private String syntax = "cql"; /* cql, cmdIndex, xpath */ |
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55 | //private String query_string; |
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56 | //private String full_query_string; |
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57 | private CQLNode query_cql; |
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58 | private String msg; |
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59 | /** |
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60 | * temporary default; |
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61 | */ |
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62 | //private String collection=""; |
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63 | //private String columns="Id,name"; |
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64 | //private String startItem = "1"; |
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65 | //private String maximumItems = "50"; |
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66 | //private String options = null; |
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67 | //private String sort; |
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68 | //private int maxdepth=1; |
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69 | |
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70 | private Map<String,String[]> params = new HashMap<String,String[]>() {{ |
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71 | String[] sarr = new String[1]; |
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72 | sarr[0] = "1"; |
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73 | put("startRecord", sarr); |
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74 | sarr = new String[1]; |
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75 | sarr[0] = "50"; |
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76 | put("maximumRecords", sarr); |
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77 | sarr = new String[1]; |
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78 | sarr[0] = "Id,name"; |
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79 | put("columns", sarr); |
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80 | sarr = new String[1]; |
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81 | sarr[0] = "1"; |
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82 | put("maxdepth", sarr); |
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83 | |
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84 | }}; |
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85 | |
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86 | private Map sruMap = null; |
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87 | /** |
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88 | * reference to the result-object |
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89 | */ |
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90 | private Result result = new Result(this); |
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91 | |
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92 | |
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93 | public Query(String queryString) { |
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94 | this(queryString, MODEL); |
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95 | } |
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96 | |
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97 | /** |
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98 | * main constructor, with user's querystring and type of the query, and context-collection (at the moment just one) |
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99 | * @param queryString |
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100 | * @param type |
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101 | * @param collection |
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102 | */ |
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103 | |
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104 | public Query(String queryString, String type, String collection, String columns) { |
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105 | this.type =type; |
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106 | addParam("query", queryString); |
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107 | //if (queryString == null)queryString =""; |
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108 | //setFullQueryString(queryString); |
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109 | setFullQueryString(); |
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110 | addParam("collection", collection); |
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111 | addParam("columns",columns); |
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112 | } |
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113 | |
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114 | /** |
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115 | * main constructor, with user's querystring and type of the query, and context-collection (at the moment just one) |
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116 | * @param queryString |
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117 | * @param type |
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118 | * @param collection |
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119 | */ |
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120 | |
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121 | public Query(String queryString, String type, String collection) { |
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122 | this( queryString, type, collection, "Id,name"); |
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123 | } |
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124 | |
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125 | /** |
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126 | * another constructor, with user's querystring and type of the query; |
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127 | * problematic not setting the collection! |
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128 | * @param queryString |
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129 | * @param type |
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130 | */ |
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131 | |
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132 | public Query(String queryString, String type) { |
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133 | this(queryString, type, ""); |
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134 | } |
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135 | |
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136 | /** |
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137 | * another constructor, with user's querystring and type of the query; |
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138 | * @param type |
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139 | * @param _params |
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140 | */ |
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141 | |
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142 | public Query( String type, Map<String,String[]> _params) { |
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143 | |
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144 | this.type = type; |
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145 | params = _params; |
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146 | this.setFullQueryString(); |
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147 | } |
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148 | |
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149 | /** |
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150 | * another constructor, with user's querystring and type of the query; |
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151 | * @param _params |
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152 | */ |
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153 | |
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154 | public Query(Map<String,String[]> _params) { |
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155 | this("search", _params); |
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156 | //this("search", _params); |
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157 | /* |
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158 | String query = null , collections = "", columns = ""; |
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159 | if (!(_params.get("query")==null)) { |
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160 | query=(String)params.get("query")[0]; |
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161 | } else { |
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162 | // error |
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163 | return; |
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164 | } |
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165 | this(queryString, "search", ""); |
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166 | params = _params; |
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167 | */ |
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168 | } |
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169 | |
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170 | public void setParams(Map<String,String[]> _params){ |
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171 | params = _params; |
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172 | } |
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173 | |
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174 | /** |
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175 | * Gets the local parameter map. |
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176 | * |
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177 | * @return |
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178 | */ |
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179 | public Map<String,String[]> getParams() { |
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180 | return params; |
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181 | } |
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182 | |
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183 | /** |
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184 | * Add parameter into local parameter map. |
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185 | * |
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186 | * @param key - parameter key |
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187 | * @param value - parameter value |
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188 | */ |
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189 | public void addParam(String key, String value){ |
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190 | String[] sarr = new String[1]; |
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191 | sarr[0] = value; |
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192 | params.put(key, sarr); |
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193 | } |
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194 | |
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195 | public void setParam(String key, String value){ |
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196 | addParam(key, value); |
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197 | } |
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198 | |
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199 | /** |
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200 | * This is for simplified access to the the values of the request-parameters |
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201 | * They are stored in the parameters-map as a String-array, |
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202 | * but in most(?) situations, we expect just a simple string. |
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203 | * @param key |
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204 | * @return |
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205 | */ |
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206 | public String getParam(String key) { |
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207 | String v = ""; |
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208 | if (!(params.get(key)==null)) v=(String)params.get(key)[0]; |
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209 | return v; |
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210 | } |
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211 | |
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212 | |
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213 | public Boolean isStatus(String qstatus) { |
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214 | return (qstatus.equals(getStatus())); |
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215 | } |
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216 | |
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217 | public String getStatus() { |
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218 | if (type.equals(Query.RECORDSET) && query_cql== null && (!getParam("query").equals(""))) { |
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219 | return Query.PARSEERROR; |
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220 | } else { |
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221 | return Query.UNPARSED; |
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222 | } |
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223 | |
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224 | } |
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225 | |
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226 | public String getType() { |
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227 | return type; |
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228 | } |
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229 | |
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230 | public void setType(String type) { |
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231 | this.type = type; |
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232 | } |
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233 | |
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234 | |
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235 | //public void setFullQueryString(String queryString) { |
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236 | public void setFullQueryString() { |
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237 | |
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238 | String query_string = getParam("query"); |
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239 | |
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240 | //if (queryString.trim().length() == 0){ |
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241 | // queryString = null; |
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242 | //} |
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243 | |
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244 | log.debug("QUERY.FULLQUERYSTRING:" + query_string); |
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245 | if ((type.equals(RECORDSET) || (type.equals(SRURECORDSET))) && (query_string.length() > 0)) { |
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246 | parse(); |
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247 | //preprocess(); |
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248 | } |
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249 | |
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250 | } |
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251 | |
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252 | /* |
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253 | public String getFullQueryString() { |
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254 | return full_query_string; |
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255 | } |
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256 | */ |
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257 | /* |
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258 | public void setCollection(String collection) { |
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259 | if (collection!=null) { |
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260 | this.collection = collection; |
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261 | } |
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262 | } |
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263 | |
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264 | public String getCollection() { |
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265 | return collection; |
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266 | } |
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267 | |
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268 | public String getColumns() { |
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269 | return columns; |
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270 | } |
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271 | |
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272 | public void setColumns(String columns) { |
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273 | if (columns!=null) { |
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274 | this.columns = columns; |
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275 | } |
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276 | } |
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277 | |
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278 | public String getOptions() { |
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279 | return options; |
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280 | } |
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281 | |
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282 | public void setOptions(String options) { |
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283 | this.options = options; |
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284 | } |
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285 | |
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286 | public String getSort() { |
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287 | return sort; |
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288 | } |
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289 | |
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290 | public void setSort(String sort) { |
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291 | this.sort = sort; |
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292 | } |
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293 | |
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294 | public String getStartItem() { |
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295 | return startItem; |
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296 | } |
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297 | |
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298 | public void setStartItem(String startItem) { |
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299 | if (startItem!=null) { |
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300 | if (startItem.equals("")){ |
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301 | // sets default startItem |
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302 | this.startItem = "1"; |
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303 | }else { |
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304 | this.startItem = startItem; |
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305 | } |
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306 | } |
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307 | } |
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308 | |
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309 | public String getMaximumItems() { |
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310 | return maximumItems; |
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311 | } |
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312 | |
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313 | public void setMaximumItems(String maximumItems) { |
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314 | if (maximumItems!=null) { |
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315 | if (maximumItems.equals("")){ |
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316 | this.maximumItems = "50"; |
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317 | } else { |
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318 | this.maximumItems = maximumItems; |
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319 | } |
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320 | } |
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321 | } |
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322 | public void setMaxdepth(int maxdepth) { |
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323 | if (maxdepth > 0) { |
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324 | this.maxdepth = maxdepth; |
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325 | } |
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326 | } |
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327 | |
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328 | public int getMaxdepth() { |
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329 | return maxdepth; |
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330 | } |
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331 | */ |
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332 | public void setResult(Result result) { |
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333 | this.result = result; |
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334 | } |
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335 | |
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336 | |
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337 | public Result getResult() { |
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338 | return result; |
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339 | } |
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340 | |
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341 | public String getMsg() { |
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342 | return msg; |
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343 | } |
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344 | |
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345 | public void setMsg(String msg) { |
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346 | this.msg = msg; |
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347 | } |
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348 | |
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349 | |
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350 | public Map getSruMap() { |
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351 | return sruMap; |
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352 | } |
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353 | |
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354 | public void setSruMap(Map sruMap) { |
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355 | this.sruMap = sruMap; |
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356 | } |
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357 | |
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358 | |
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359 | public static String getSimpleQueryString(String querystring) { |
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360 | String[] arr_and = querystring.split(" and "); |
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361 | String simple_form = ""; |
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362 | String simple_form_all = ""; |
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363 | String rel = ""; |
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364 | |
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365 | for( int i=0;i<arr_and.length;i++){ |
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366 | arr_and[i] = arr_and[i].trim(); |
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367 | String[] arr_or = arr_and[i].split(" or "); |
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368 | simple_form = ""; |
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369 | for( int j=0;j<arr_or.length;j++){ |
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370 | arr_or[j] = arr_or[j].trim(); |
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371 | while (arr_or[j].substring(0,1).equals("(") ) { |
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372 | arr_or[j] = arr_or[j].substring(1,arr_or[j].length()); |
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373 | arr_or[j] = arr_or[j].trim(); |
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374 | } |
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375 | while ( arr_or[j].substring(arr_or[j].length()-1,arr_or[j].length()).equals(")")){ |
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376 | arr_or[j] = arr_or[j].substring(0,arr_or[j].length()-1); |
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377 | arr_or[j] = arr_or[j].trim(); |
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378 | } |
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379 | if (j > 0) { |
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380 | rel = " or "; |
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381 | } else { |
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382 | rel = ""; |
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383 | } |
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384 | simple_form = simple_form + rel + arr_or[j]; |
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385 | } |
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386 | |
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387 | if (arr_or.length > 1){ |
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388 | simple_form = "(" + simple_form + ") "; |
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389 | } |
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390 | if (i > 0) { |
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391 | rel = " and "; |
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392 | } else { |
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393 | rel = ""; |
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394 | } |
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395 | simple_form_all = simple_form_all + rel + simple_form; |
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396 | |
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397 | } |
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398 | |
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399 | return simple_form_all; |
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400 | } |
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401 | /** |
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402 | * construct the URL-Param |
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403 | * @return |
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404 | * @throws MalformedURLException |
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405 | * TODO url-encode (especially the query-param) ! |
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406 | */ |
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407 | public String toURLParam() throws MalformedURLException { |
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408 | |
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409 | String targetRequest; |
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410 | |
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411 | if (type.equals(MODEL)) { |
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412 | //targetRequest = fromCMDIndex2Xpath() + "&maxdepth=" + getMaxdepth() ; /* + "&maxdepth=" + getMaxdepth() ); "&collection=" + getCollection() + */ |
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413 | targetRequest = fromCMDIndex2Xpath() + "&maxdepth=" + getParam("maxdepth") ; /* + "&maxdepth=" + getMaxdepth() ); "&collection=" + getCollection() + */ |
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414 | } |
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415 | else if (type.equals(COLLECTION)) { |
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416 | targetRequest = getParam("collection") + "&maxdepth=" + getParam("maxdepth") ; /* + "&maxdepth=" + getMaxdepth() ); "&collection=" + getCollection() + */ |
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417 | |
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418 | } else if (type.equals(SRUEXTERN)) { |
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419 | String paramsign = "?"; |
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420 | targetRequest = ""; |
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421 | |
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422 | Set set = params.entrySet(); |
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423 | Iterator i = set.iterator(); |
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424 | |
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425 | while(i.hasNext()){ |
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426 | Map.Entry me = (Map.Entry)i.next(); |
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427 | if (!(((String)me.getKey()).startsWith("x-cmd"))){ |
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428 | targetRequest = targetRequest + paramsign + me.getKey() + "=" + ((String[])me.getValue())[0]; |
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429 | paramsign = "&"; |
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430 | } |
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431 | } |
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432 | |
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433 | } else if (type.equals(VALUES)) { |
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434 | targetRequest = fromCMDIndex2Xpath() ; /* + "&maxdepth=" + getMaxdepth() ); "&collection=" + getCollection() + */ |
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435 | |
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436 | if (getParam("startItem") != null) { |
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437 | targetRequest = targetRequest + "&startItem=" + getParam("startItem"); |
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438 | } |
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439 | if (getParam("maximumItems") != null) { |
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440 | targetRequest = targetRequest + "&maxItems=" + getParam("maximumItems"); |
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441 | } |
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442 | if (getParam("sort") != null) { |
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443 | targetRequest = targetRequest + "&sort=" + getParam("sort"); |
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444 | } |
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445 | |
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446 | } else if (type.equals(FCSRECORDSET)) { |
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447 | targetRequest = "?"; |
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448 | |
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449 | |
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450 | if (!getParam("operation").equals("")) { |
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451 | targetRequest = targetRequest + "operation=" + getParam("operation"); |
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452 | } |
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453 | if (!getParam("scanClause").equals("")) { |
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454 | targetRequest = targetRequest + "&scanClause=" + getParam("scanClause"); |
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455 | } |
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456 | if (!getParam("query").equals("")) { |
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457 | targetRequest = targetRequest + "&query=" + getParam("query"); |
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458 | } |
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459 | if (!getParam("x-context").equals("")) { |
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460 | targetRequest = targetRequest + "&x-context=" + getParam("x-context"); |
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461 | } |
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462 | |
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463 | }else if (type.equals(RECORD)) { |
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464 | // 2010-07-11 this is just a hack, because url-encoding the handle acted strange |
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465 | //String corrid = getQueryString().replace('_', '/'); |
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466 | // 2010-12-28 needed for the lucene-index to recognize.. |
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467 | // probably not the best place to handle -> move to repository: sanitize-query? |
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468 | String corrid = getParam("query").replace(":","\\:").toLowerCase(); |
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469 | log.debug("Query.toURLParam.corrid=" + corrid); |
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470 | targetRequest = "//MdSelfLink[ft:query(.,'" + corrid + "')]"; |
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471 | } else if (type.equals(SRURECORDSET) || type.equals(FCSRECORDSET)) { |
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472 | targetRequest = "?query="+ getParam("query") + "&operation=" + getParam("operation"); |
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473 | |
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474 | if (!getParam("startRecord").equals("")) { |
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475 | targetRequest = targetRequest + "&startRecord=" + getParam("startRecord"); |
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476 | } |
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477 | if (!getParam("maximumRecords").equals("")) { |
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478 | targetRequest = targetRequest + "&maximumRecords=" + getParam("maximumRecords"); |
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479 | } |
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480 | if ((!getParam("version").equals(""))) { |
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481 | targetRequest = targetRequest + "&version=" + getParam("version"); |
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482 | } |
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483 | } else { |
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484 | if (query_cql == null){ |
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485 | targetRequest = "//*" + "&collection=" + getParam("collection"); |
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486 | } else { |
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487 | targetRequest = toXPath() + "&collection=" + getParam("collection"); |
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488 | } |
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489 | if (!getParam("startRecord").equals("")) { |
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490 | targetRequest = targetRequest + "&startRecord=" + getParam("startRecord"); |
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491 | } |
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492 | if (!getParam("maximumRecords").equals("")) { |
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493 | targetRequest = targetRequest + "&maximumRecords=" + getParam("maximumRecords"); |
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494 | } |
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495 | if ((!getParam("options").equals(""))) { |
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496 | targetRequest = targetRequest + "&format=xml-" + getParam("options"); |
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497 | } |
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498 | } |
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499 | |
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500 | return targetRequest; |
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501 | |
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502 | } |
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503 | |
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504 | /** |
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505 | * tries to parse the full_query_string according the CQL-syntax |
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506 | * if successful returns the root-node of the parse-tree |
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507 | */ |
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508 | public CQLNode parse() { |
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509 | |
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510 | try { |
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511 | CQLParser parser = new CQLParser(); |
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512 | // cannot accept '-' at the CQL beginning |
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513 | String local_full_query_string = getParam("query"); |
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514 | local_full_query_string = local_full_query_string.replace("-", "%2D"); |
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515 | |
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516 | query_cql = parser.parse(local_full_query_string); |
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517 | } |
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518 | catch (CQLParseException e) { |
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519 | // TODO better handling of failed parse |
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520 | setMsg("Query.ParseError-"+ e.getClass() + ": " + e.getMessage()); |
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521 | } catch (IOException e) { |
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522 | // TODO Auto-generated catch block |
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523 | e.printStackTrace(); |
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524 | } |
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525 | |
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526 | |
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527 | return query_cql; |
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528 | } |
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529 | |
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530 | /** |
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531 | */ |
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532 | public void preprocess() { |
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533 | |
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534 | try { |
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535 | log.debug(toXCQL()); |
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536 | |
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537 | |
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538 | DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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539 | DocumentBuilder builder = factory.newDocumentBuilder(); |
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540 | Document doc = builder.parse(new org.xml.sax.InputSource(new java.io.StringReader(toXCQL()))); |
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541 | |
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542 | //log.debug("document created"); |
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543 | SearchClauses searchclauses = new SearchClauses(doc); |
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544 | //do the processing |
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545 | searchclauses.process(); |
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546 | String xml_s = searchclauses.toXML(); |
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547 | |
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548 | |
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549 | } |
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550 | catch (Exception e) { |
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551 | e.printStackTrace(); |
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552 | } |
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553 | return; |
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554 | } |
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555 | |
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556 | /** |
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557 | * provides a xml-version of the query (if parsed successfully) |
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558 | * according to the XCQL-schema defined in the SRU/CQL standard |
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559 | * @return |
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560 | */ |
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561 | public String toXCQL() { |
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562 | return query_cql.toXCQL(0); |
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563 | } |
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564 | |
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565 | /** |
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566 | * provides a xpath version of the query, based on the XCQL-version, |
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567 | * applying a stylesheet on the XCQL-version |
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568 | * @return XPath-query |
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569 | * @throws IOException |
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570 | */ |
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571 | public String toXPath() { |
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572 | MDTransformer transformer = new MDTransformer(); |
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573 | transformer.configure(Utils.getAppConfig("mdservice"), this.getClass().getClassLoader()); |
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574 | transformer.setParams(MDTransformer.createParamsMap("XCQL2XPATH")); |
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575 | try { |
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576 | return transformer.transformXML(toXCQL()); |
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577 | } catch (NoStylesheetException e) { |
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578 | setMsg("Query.toXPath-"+ e.getClass() + ": " + e.getMessage()); |
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579 | return ""; |
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580 | } |
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581 | } |
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582 | |
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583 | /** |
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584 | * if the query is just a path-like structure |
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585 | * "transforms" the cmdIndex-format to appropriate XPath, means replace('.', '/') ;) |
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586 | * and resolves back possible profile-prefix |
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587 | * @return |
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588 | */ |
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589 | public String fromCMDIndex2Xpath() { |
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590 | String xpath = ""; |
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591 | String query_string= getParam("query"); |
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592 | if (query_string.contains(":")) { |
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593 | int delim_index = query_string.indexOf(":"); |
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594 | String profile_name = query_string.substring(0,delim_index ); |
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595 | Termset res = (Termset) Termset.getTermset(profile_name); |
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596 | if (res!=null) { |
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597 | profile_name= res.getAttr("name"); |
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598 | } |
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599 | if (profile_name.equals("")) { |
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600 | xpath=query_string.substring(delim_index); |
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601 | } else { |
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602 | xpath = profile_name + "//" + query_string.substring(delim_index+1); |
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603 | } |
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604 | |
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605 | } else { |
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606 | xpath = query_string; |
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607 | } |
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608 | |
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609 | return xpath.replace(".", "//"); |
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610 | } |
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611 | } |
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