lucene-java-3.4.0/lucene/contrib/xml-query-parser/src/java/org/apache/lucene/xmlparser/builders/SpanOrTermsBuilder.java

   1 package org.apache.lucene.xmlparser.builders;
   2
   3 import java.io.IOException;
   4 import java.io.StringReader;
   5 import java.util.ArrayList;
   6
   7 import org.apache.lucene.analysis.Analyzer;
   8 import org.apache.lucene.analysis.TokenStream;
   9 import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
  10 import org.apache.lucene.index.Term;
  11 import org.apache.lucene.search.spans.SpanOrQuery;
  12 import org.apache.lucene.search.spans.SpanQuery;
  13 import org.apache.lucene.search.spans.SpanTermQuery;
  14 import org.apache.lucene.xmlparser.DOMUtils;
  15 import org.apache.lucene.xmlparser.ParserException;
  16 import org.w3c.dom.Element;
  17 /**
  18  * Licensed to the Apache Software Foundation (ASF) under one or more
  19  * contributor license agreements.  See the NOTICE file distributed with
  20  * this work for additional information regarding copyright ownership.
  21  * The ASF licenses this file to You under the Apache License, Version 2.0
  22  * (the "License"); you may not use this file except in compliance with
  23  * the License.  You may obtain a copy of the License at
  24  *
  25  *     http://www.apache.org/licenses/LICENSE-2.0
  26  *
  27  * Unless required by applicable law or agreed to in writing, software
  28  * distributed under the License is distributed on an "AS IS" BASIS,
  29  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  30  * See the License for the specific language governing permissions and
  31  * limitations under the License.
  32  */
  33
  34 /**
  35  *
  36  */
  37 public class SpanOrTermsBuilder extends SpanBuilderBase
  38 {
  39     Analyzer analyzer;
  40
  41
  42     /**
  43      * @param analyzer
  44      */
  45     public SpanOrTermsBuilder(Analyzer analyzer)
  46     {
  47         super();
  48         this.analyzer = analyzer;
  49     }
  50         public SpanQuery getSpanQuery(Element e) throws ParserException
  51         {
  52                 String fieldName=DOMUtils.getAttributeWithInheritanceOrFail(e,"fieldName");
  53                 String value=DOMUtils.getNonBlankTextOrFail(e);
  54
  55                 try
  56                 {
  57                         ArrayList<SpanQuery> clausesList=new ArrayList<SpanQuery>();
  58                         TokenStream ts=analyzer.reusableTokenStream(fieldName,new StringReader(value));
  59                         CharTermAttribute termAtt = ts.addAttribute(CharTermAttribute.class);
  60
  61       ts.reset();
  62             while (ts.incrementToken()) {
  63                             SpanTermQuery stq=new SpanTermQuery(new Term(fieldName, termAtt.toString()));
  64                             clausesList.add(stq);
  65                         }
  66             ts.end();
  67             ts.close();
  68                         SpanOrQuery soq=new SpanOrQuery(clausesList.toArray(new SpanQuery[clausesList.size()]));
  69                         soq.setBoost(DOMUtils.getAttribute(e,"boost",1.0f));
  70                         return soq;
  71                 }
  72                 catch(IOException ioe)
  73                 {
  74                     throw new ParserException("IOException parsing value:"+value);
  75                 }
  76         }
  77
  78 }