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Lucene example source code file (TestSpanQueryFilter.java)

This example Lucene source code file (TestSpanQueryFilter.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

docidset, docidsetiterator, docidsetiterator, document, document, exception, exception, randomindexwriter, randomindexwriter, size, spanqueryfilter, spantermquery, term, testspanqueryfilter, util

The Lucene TestSpanQueryFilter.java source code

package org.apache.lucene.search;

/**
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed 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.List;

import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.spans.SpanTermQuery;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.English;
import org.apache.lucene.util.LuceneTestCase;

public class TestSpanQueryFilter extends LuceneTestCase {

  public void testFilterWorks() throws Exception {
    Directory dir = newDirectory();
    RandomIndexWriter writer = new RandomIndexWriter(random, dir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).setMergePolicy(newLogMergePolicy()));
    for (int i = 0; i < 500; i++) {
      Document document = new Document();
      document.add(newField("field", English.intToEnglish(i) + " equals " + English.intToEnglish(i),
              Field.Store.NO, Field.Index.ANALYZED));
      writer.addDocument(document);
    }
    IndexReader reader = writer.getReader();
    writer.close();

    SpanTermQuery query = new SpanTermQuery(new Term("field", English.intToEnglish(10).trim()));
    SpanQueryFilter filter = new SpanQueryFilter(query);
    SpanFilterResult result = filter.bitSpans(reader);
    DocIdSet docIdSet = result.getDocIdSet();
    assertTrue("docIdSet is null and it shouldn't be", docIdSet != null);
    assertContainsDocId("docIdSet doesn't contain docId 10", docIdSet, 10);
    List<SpanFilterResult.PositionInfo> spans = result.getPositions();
    assertTrue("spans is null and it shouldn't be", spans != null);
    int size = getDocIdSetSize(docIdSet);
    assertTrue("spans Size: " + spans.size() + " is not: " + size, spans.size() == size);
    for (final SpanFilterResult.PositionInfo info: spans) {
      assertTrue("info is null and it shouldn't be", info != null);
      //The doc should indicate the bit is on
      assertContainsDocId("docIdSet doesn't contain docId " + info.getDoc(), docIdSet, info.getDoc());
      //There should be two positions in each
      assertTrue("info.getPositions() Size: " + info.getPositions().size() + " is not: " + 2, info.getPositions().size() == 2);
    }
    reader.close();
    dir.close();
  }
  
  int getDocIdSetSize(DocIdSet docIdSet) throws Exception {
    int size = 0;
    DocIdSetIterator it = docIdSet.iterator();
    while (it.nextDoc() != DocIdSetIterator.NO_MORE_DOCS) {
      size++;
    }
    return size;
  }
  
  public void assertContainsDocId(String msg, DocIdSet docIdSet, int docId) throws Exception {
    DocIdSetIterator it = docIdSet.iterator();
    assertTrue(msg, it.advance(docId) != DocIdSetIterator.NO_MORE_DOCS);
    assertTrue(msg, it.docID() == docId);
  }
}

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