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Lucene example source code file (SimpleSloppyPhraseQueryMaker.java)

This example Lucene source code file (SimpleSloppyPhraseQueryMaker.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

arraylist, arraylist, exception, override, phrasequery, phrasequery, query, query, simplequerymaker, simplesloppyphrasequerymaker, string, string, stringtokenizer, util

The Lucene SimpleSloppyPhraseQueryMaker.java source code

package org.apache.lucene.benchmark.byTask.feeds;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.ArrayList;
import java.util.StringTokenizer;

import org.apache.lucene.index.Term;
import org.apache.lucene.search.PhraseQuery;
import org.apache.lucene.search.Query;

/**
 * Create sloppy phrase queries for performance test, in an index created using simple doc maker.
 */
public class SimpleSloppyPhraseQueryMaker extends SimpleQueryMaker {

  /* (non-Javadoc)
   * @see org.apache.lucene.benchmark.byTask.feeds.SimpleQueryMaker#prepareQueries()
   */
  @Override
  protected Query[] prepareQueries() throws Exception {
    // extract some 100 words from doc text to an array
    String words[];
    ArrayList<String> w = new ArrayList();
    StringTokenizer st = new StringTokenizer(SingleDocSource.DOC_TEXT);
    while (st.hasMoreTokens() && w.size()<100) {
      w.add(st.nextToken());
    }
    words = w.toArray(new String[0]);

    // create queries (that would find stuff) with varying slops
    ArrayList<Query> queries = new ArrayList(); 
    for (int slop=0; slop<8; slop++) {
      for (int qlen=2; qlen<6; qlen++) {
        for (int wd=0; wd<words.length-qlen-slop; wd++) {
          // ordered
          int remainedSlop = slop;
          PhraseQuery q = new PhraseQuery();
          q.setSlop(slop);
          int wind = wd;
          for (int i=0; i<qlen; i++) {
            q.add(new Term(DocMaker.BODY_FIELD,words[wind++]));
            if (remainedSlop>0) {
              remainedSlop--;
              wind++;
            }
          }
          queries.add(q);
          // reversed
          remainedSlop = slop;
          q = new PhraseQuery();
          q.setSlop(slop+2*qlen);
          wind = wd+qlen+remainedSlop-1;
          for (int i=0; i<qlen; i++) {
            q.add(new Term(DocMaker.BODY_FIELD,words[wind--]));
            if (remainedSlop>0) {
              remainedSlop--;
              wind--;
            }
          }
          queries.add(q);
        }
      }
    }
    return queries.toArray(new Query[0]);
  }

}

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