Save This Page
Home » lucene-3.0.1-src » org.apache.lucene.queryParser.standard.builders » [javadoc | source]
    1   package org.apache.lucene.queryParser.standard.builders;
    2   
    3   /**
    4    * Licensed to the Apache Software Foundation (ASF) under one or more
    5    * contributor license agreements.  See the NOTICE file distributed with
    6    * this work for additional information regarding copyright ownership.
    7    * The ASF licenses this file to You under the Apache License, Version 2.0
    8    * (the "License"); you may not use this file except in compliance with
    9    * the License.  You may obtain a copy of the License at
   10    *
   11    *     http://www.apache.org/licenses/LICENSE-2.0
   12    *
   13    * Unless required by applicable law or agreed to in writing, software
   14    * distributed under the License is distributed on an "AS IS" BASIS,
   15    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   16    * See the License for the specific language governing permissions and
   17    * limitations under the License.
   18    */
   19   
   20   import java.util.List;
   21   
   22   import org.apache.lucene.queryParser.core.QueryNodeException;
   23   import org.apache.lucene.queryParser.core.builders.QueryTreeBuilder;
   24   import org.apache.lucene.queryParser.core.nodes.FieldQueryNode;
   25   import org.apache.lucene.queryParser.core.nodes.QueryNode;
   26   import org.apache.lucene.queryParser.core.nodes.TokenizedPhraseQueryNode;
   27   import org.apache.lucene.search.PhraseQuery;
   28   import org.apache.lucene.search.TermQuery;
   29   
   30   /**
   31    * Builds a {@link PhraseQuery} object from a {@link TokenizedPhraseQueryNode}
   32    * object.
   33    */
   34   public class PhraseQueryNodeBuilder implements StandardQueryBuilder {
   35   
   36     public PhraseQueryNodeBuilder() {
   37       // empty constructor
   38     }
   39   
   40     public PhraseQuery build(QueryNode queryNode) throws QueryNodeException {
   41       TokenizedPhraseQueryNode phraseNode = (TokenizedPhraseQueryNode) queryNode;
   42   
   43       PhraseQuery phraseQuery = new PhraseQuery();
   44   
   45       List<QueryNode> children = phraseNode.getChildren();
   46   
   47       if (children != null) {
   48   
   49         for (QueryNode child : children) {
   50           TermQuery termQuery = (TermQuery) child
   51               .getTag(QueryTreeBuilder.QUERY_TREE_BUILDER_TAGID);
   52           FieldQueryNode termNode = (FieldQueryNode) child;
   53   
   54           phraseQuery.add(termQuery.getTerm(), termNode.getPositionIncrement());
   55   
   56         }
   57   
   58       }
   59   
   60       return phraseQuery;
   61   
   62     }
   63   
   64   }

Save This Page
Home » lucene-3.0.1-src » org.apache.lucene.queryParser.standard.builders » [javadoc | source]