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Lucene example source code file (DuplicateFilterTest.java)

This example Lucene source code file (DuplicateFilterTest.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, document, duplicatefilter, duplicatefilter, filtered, hashset, hashset, io, lucene, no, scoredoc, string, string, term, throwable, util

The Lucene DuplicateFilterTest.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.io.IOException;
import java.util.HashSet;

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.index.TermDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;

public class DuplicateFilterTest extends LuceneTestCase {
	private static final String KEY_FIELD = "url";
	private Directory directory;
	private IndexReader reader;
	TermQuery tq=new TermQuery(new Term("text","lucene"));
	private IndexSearcher searcher;

	@Override
	public void setUp() throws Exception {
    super.setUp();
		directory = newDirectory();
		RandomIndexWriter writer = new RandomIndexWriter(random, directory, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).setMergePolicy(newLogMergePolicy()));
		
		//Add series of docs with filterable fields : url, text and dates  flags
		addDoc(writer, "http://lucene.apache.org", "lucene 1.4.3 available", "20040101");
		addDoc(writer, "http://lucene.apache.org", "New release pending", "20040102");
		addDoc(writer, "http://lucene.apache.org", "Lucene 1.9 out now", "20050101");		
		addDoc(writer, "http://www.bar.com", "Local man bites dog", "20040101");
		addDoc(writer, "http://www.bar.com", "Dog bites local man", "20040102");
		addDoc(writer, "http://www.bar.com", "Dog uses Lucene", "20050101");
		addDoc(writer, "http://lucene.apache.org", "Lucene 2.0 out", "20050101");
		addDoc(writer, "http://lucene.apache.org", "Oops. Lucene 2.1 out", "20050102");

                // Until we fix LUCENE-2348, the index must
                // have only 1 segment:
                writer.optimize();

		reader = writer.getReader();
		writer.close();			
		searcher =newSearcher(reader);
		
	}
	
	@Override
	public void tearDown() throws Exception {
		reader.close();
		searcher.close();
		directory.close();
		super.tearDown();
	}

	private void addDoc(RandomIndexWriter writer, String url, String text, String date) throws IOException
	{
		Document doc=new Document();
		doc.add(newField(KEY_FIELD,url,Field.Store.YES,Field.Index.NOT_ANALYZED));
		doc.add(newField("text",text,Field.Store.YES,Field.Index.ANALYZED));
		doc.add(newField("date",date,Field.Store.YES,Field.Index.ANALYZED));
		writer.addDocument(doc);
	}
		
	public void testDefaultFilter() throws Throwable
	{
		DuplicateFilter df=new DuplicateFilter(KEY_FIELD);		
		HashSet<String> results=new HashSet();
		ScoreDoc[] hits = searcher.search(tq,df, 1000).scoreDocs;
		for(int i=0;i<hits.length;i++)
		{
			Document d=searcher.doc(hits[i].doc);
			String url=d.get(KEY_FIELD);
			assertFalse("No duplicate urls should be returned",results.contains(url));
			results.add(url);
		}
	}
	public void testNoFilter() throws Throwable
	{
		HashSet<String> results=new HashSet();
		ScoreDoc[] hits = searcher.search(tq, null, 1000).scoreDocs;
		assertTrue("Default searching should have found some matches",hits.length>0);
		boolean dupsFound=false;
		for(int i=0;i<hits.length;i++)
		{
			Document d=searcher.doc(hits[i].doc);
			String url=d.get(KEY_FIELD);
			if(!dupsFound)
				dupsFound=results.contains(url);
			results.add(url);
		}
		assertTrue("Default searching should have found duplicate urls",dupsFound);
	}
	
	public void testFastFilter() throws Throwable
	{
		DuplicateFilter df=new DuplicateFilter(KEY_FIELD);
		df.setProcessingMode(DuplicateFilter.PM_FAST_INVALIDATION);
		HashSet<String> results=new HashSet();
		ScoreDoc[] hits = searcher.search(tq,df, 1000).scoreDocs;
		assertTrue("Filtered searching should have found some matches",hits.length>0);
		for(int i=0;i<hits.length;i++)
		{
			Document d=searcher.doc(hits[i].doc);
			String url=d.get(KEY_FIELD);
			assertFalse("No duplicate urls should be returned",results.contains(url));
			results.add(url);
		}
		assertEquals("Two urls found",2, results.size());
	}	
	public void testKeepsLastFilter() throws Throwable
	{
		DuplicateFilter df=new DuplicateFilter(KEY_FIELD);
		df.setKeepMode(DuplicateFilter.KM_USE_LAST_OCCURRENCE);
		ScoreDoc[] hits = searcher.search(tq,df, 1000).scoreDocs;
		assertTrue("Filtered searching should have found some matches",hits.length>0);
		for(int i=0;i<hits.length;i++)
		{
			Document d=searcher.doc(hits[i].doc);
			String url=d.get(KEY_FIELD);
			TermDocs td = reader.termDocs(new Term(KEY_FIELD,url));
			int lastDoc=0;
			while(td.next())
			{
				lastDoc=td.doc();
			}
			assertEquals("Duplicate urls should return last doc",lastDoc, hits[i].doc);
		}
	}	
	
	
	public void testKeepsFirstFilter() throws Throwable
	{
		DuplicateFilter df=new DuplicateFilter(KEY_FIELD);
		df.setKeepMode(DuplicateFilter.KM_USE_FIRST_OCCURRENCE);
		ScoreDoc[] hits = searcher.search(tq,df, 1000).scoreDocs;
		assertTrue("Filtered searching should have found some matches",hits.length>0);
		for(int i=0;i<hits.length;i++)
		{
			Document d=searcher.doc(hits[i].doc);
			String url=d.get(KEY_FIELD);
			TermDocs td = reader.termDocs(new Term(KEY_FIELD,url));
			int lastDoc=0;
			td.next();
			lastDoc=td.doc();
			assertEquals("Duplicate urls should return first doc",lastDoc, hits[i].doc);
		}
	}	
	
	
}

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