Lucene example source code file (TermsFilterTest.java)

This example Lucene source code file (TermsFilterTest.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

document, exception, hashset, indexreader, must, must, randomindexwriter, randomindexwriter, string, term, term, termsfilter, termsfilter, termsfiltertest, util

The Lucene TermsFilterTest.java source code

package org.apache.lucene.search;

/**
 * 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.HashSet;
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.store.Directory;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util.OpenBitSet;

public class TermsFilterTest extends LuceneTestCase {
  
	public void testCachability() throws Exception
	{
		TermsFilter a=new TermsFilter();
		a.addTerm(new Term("field1","a"));
		a.addTerm(new Term("field1","b"));
		HashSet<Filter> cachedFilters=new HashSet();
		cachedFilters.add(a);
		TermsFilter b=new TermsFilter();
		b.addTerm(new Term("field1","a"));
		b.addTerm(new Term("field1","b"));
		
		assertTrue("Must be cached",cachedFilters.contains(b));
		b.addTerm(new Term("field1","a")); //duplicate term
		assertTrue("Must be cached",cachedFilters.contains(b));
		b.addTerm(new Term("field1","c"));
		assertFalse("Must not be cached",cachedFilters.contains(b));
	}
	
	public void testMissingTerms() throws Exception {
		String fieldName="field1";
		Directory rd=newDirectory();
		RandomIndexWriter w = new RandomIndexWriter(random, rd);
		for (int i = 0; i < 100; i++) {
			Document doc=new Document();
			int term=i*10; //terms are units of 10;
			doc.add(newField(fieldName,""+term,Field.Store.YES,Field.Index.NOT_ANALYZED));
			w.addDocument(doc);			
		}
		IndexReader reader = w.getReader();
		w.close();
		
		TermsFilter tf=new TermsFilter();
		tf.addTerm(new Term(fieldName,"19"));
		OpenBitSet bits = (OpenBitSet)tf.getDocIdSet(reader);
		assertEquals("Must match nothing", 0, bits.cardinality());

		tf.addTerm(new Term(fieldName,"20"));
		bits = (OpenBitSet)tf.getDocIdSet(reader);
		assertEquals("Must match 1", 1, bits.cardinality());
		
		tf.addTerm(new Term(fieldName,"10"));
		bits = (OpenBitSet)tf.getDocIdSet(reader);
		assertEquals("Must match 2", 2, bits.cardinality());
		
		tf.addTerm(new Term(fieldName,"00"));
		bits = (OpenBitSet)tf.getDocIdSet(reader);
		assertEquals("Must match 2", 2, bits.cardinality());
		
		reader.close();
		rd.close();
	}
}