QueryWordsExactPhrase


1   /*******************************************************************************
2    * Copyright (c) 2000, 2006 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  package org.eclipse.help.internal.search;
12  import java.util.ArrayList  ;
13  import java.util.Iterator  ;
14  import java.util.List  ;
15  
16  import org.apache.lucene.index.*;
17  import org.apache.lucene.search.*;
18  /**
19   * Represents a quoted token in user search query words
20   */
21  public class QueryWordsExactPhrase extends QueryWordsToken {
22      private List   words;
23      public QueryWordsExactPhrase() {
24          super(QueryWordsToken.EXACT_PHRASE, ""); //$NON-NLS-1$
25          words = new ArrayList  ();
26      }
27      public void addWord(String   word) {
28          words.add(word);
29          if (words.size() <= 1)
30              value = word;
31          else
32              value += " " + word; //$NON-NLS-1$
33      }
34      public List   getWords() {
35          return words;
36      }
37      /**
38       * Creates a lucene query for a field
39       */
40      public Query createLuceneQuery(String   field, float boost) {
41          PhraseQuery q = new PhraseQuery();
42          for (Iterator   it = getWords().iterator(); it.hasNext();) {
43              String   word = (String  ) it.next();
44              Term t = new Term("exact_" + field, word); //$NON-NLS-1$
45              q.add(t);
46              q.setBoost(boost);
47          }
48          return q;
49      }
50  }
51
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