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Lucene example source code file (TestParser.java)

This example Lucene source code file (TestParser.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

boolean, bufferedreader, exception, exception, filter, indexwriter, io, ioexception, ioexception, numericfield, parserexception, parserexception, query, query, string

The Lucene TestParser.java source code

package org.apache.lucene.xmlparser;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.NumericField;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.Version;
import org.apache.lucene.util.LuceneTestCase;
import org.junit.AfterClass;
import org.junit.Assume;
import org.junit.BeforeClass;
/**
 * 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.
 */

public class TestParser extends LuceneTestCase {
	private static CoreParser builder;
	private static Directory dir;
	private static IndexReader reader;
	private static IndexSearcher searcher;

	@BeforeClass
	public static void beforeClass() throws Exception {
	  // TODO: rewrite test (this needs to set QueryParser.enablePositionIncrements, too, for work with CURRENT):
	  Analyzer analyzer=new StandardAnalyzer(org.apache.lucene.util.Version.LUCENE_24); 
    //initialize the parser
	  builder=new CorePlusExtensionsParser("contents",analyzer);
		
			BufferedReader d = new BufferedReader(new InputStreamReader(TestParser.class.getResourceAsStream("reuters21578.txt"))); 
			dir=newDirectory();
			IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(Version.LUCENE_24, analyzer));
			String line = d.readLine();		
			while(line!=null)
			{
				int endOfDate=line.indexOf('\t');
				String date=line.substring(0,endOfDate).trim();
				String content=line.substring(endOfDate).trim();
				org.apache.lucene.document.Document doc =new org.apache.lucene.document.Document();
				doc.add(newField("date",date,Field.Store.YES,Field.Index.ANALYZED));
				doc.add(newField("contents",content,Field.Store.YES,Field.Index.ANALYZED));
				NumericField numericField = new NumericField("date2");
				numericField.setIntValue(Integer.valueOf(date));
				doc.add(numericField);
				writer.addDocument(doc);
				line=d.readLine();
			}			
			d.close();
      writer.close();
		reader=IndexReader.open(dir, true);
		searcher=newSearcher(reader);
		
	}
	
	
	
	
	@AfterClass
	public static void afterClass() throws Exception {
		reader.close();
		searcher.close();
		dir.close();
		reader = null;
		searcher = null;
		dir = null;
		builder = null;
	}
	
	public void testSimpleXML() throws ParserException, IOException
	{
			Query q=parse("TermQuery.xml");
			dumpResults("TermQuery", q, 5);
	}
	public void testSimpleTermsQueryXML() throws ParserException, IOException
	{
			Query q=parse("TermsQuery.xml");
			dumpResults("TermsQuery", q, 5);
	}
	public void testBooleanQueryXML() throws ParserException, IOException
	{
			Query q=parse("BooleanQuery.xml");
			dumpResults("BooleanQuery", q, 5);
	}
	public void testRangeFilterQueryXML() throws ParserException, IOException
	{
			Query q=parse("RangeFilterQuery.xml");
			dumpResults("RangeFilter", q, 5);
	}
	public void testUserQueryXML() throws ParserException, IOException
	{
			Query q=parse("UserInputQuery.xml");
			dumpResults("UserInput with Filter", q, 5);
	}
	
	public void testCustomFieldUserQueryXML() throws ParserException, IOException
	{
			Query q=parse("UserInputQueryCustomField.xml");
			int h = searcher.search(q, null, 1000).totalHits;
			assertEquals("UserInputQueryCustomField should produce 0 result ", 0,h);
	}
	
	public void testLikeThisQueryXML() throws Exception
	{
			Query q=parse("LikeThisQuery.xml");
			dumpResults("like this", q, 5);
	}
	public void testBoostingQueryXML() throws Exception
	{
			Query q=parse("BoostingQuery.xml");
			dumpResults("boosting ",q, 5);
	}
	public void testFuzzyLikeThisQueryXML() throws Exception
	{
			Query q=parse("FuzzyLikeThisQuery.xml");
			//show rewritten fuzzyLikeThisQuery - see what is being matched on
			if(VERBOSE)
			{
				System.out.println(q.rewrite(reader));
			}
			dumpResults("FuzzyLikeThis", q, 5);
	}
	public void testTermsFilterXML() throws Exception
	{
			Query q=parse("TermsFilterQuery.xml");
			dumpResults("Terms Filter",q, 5);
	}
  public void testBoostingTermQueryXML() throws Exception
	{
			Query q=parse("BoostingTermQuery.xml");
			dumpResults("BoostingTermQuery",q, 5);
	}
  public void testSpanTermXML() throws Exception
	{
			Query q=parse("SpanQuery.xml");
			dumpResults("Span Query",q, 5);
	}
	public void testConstantScoreQueryXML() throws Exception
	{
			Query q=parse("ConstantScoreQuery.xml");
			dumpResults("ConstantScoreQuery",q, 5);
	}
	public void testMatchAllDocsPlusFilterXML() throws ParserException, IOException
	{
			Query q=parse("MatchAllDocsQuery.xml");
			dumpResults("MatchAllDocsQuery with range filter", q, 5);
	}
	public void testBooleanFilterXML() throws ParserException, IOException
	{
			Query q=parse("BooleanFilter.xml");
			dumpResults("Boolean filter", q, 5);
	}
	public void testNestedBooleanQuery() throws ParserException, IOException
	{
			Query q=parse("NestedBooleanQuery.xml");
			dumpResults("Nested Boolean query", q, 5);
	}
	public void testCachedFilterXML() throws ParserException, IOException
	{
			Query q=parse("CachedFilter.xml");
			dumpResults("Cached filter", q, 5);
	}
	public void testDuplicateFilterQueryXML() throws ParserException, IOException
	{
          Assume.assumeTrue(searcher.getIndexReader().getSequentialSubReaders() == null || 
                            searcher.getIndexReader().getSequentialSubReaders().length == 1);
			Query q=parse("DuplicateFilterQuery.xml");
			int h = searcher.search(q, null, 1000).totalHits;
			assertEquals("DuplicateFilterQuery should produce 1 result ", 1,h);
	}
	
	public void testNumericRangeFilterQueryXML() throws ParserException, IOException
	{
			Query q=parse("NumericRangeFilterQuery.xml");
			dumpResults("NumericRangeFilter", q, 5);
	}
	
	public void testNumericRangeQueryQueryXML() throws ParserException, IOException
	{
			Query q=parse("NumericRangeQueryQuery.xml");
			dumpResults("NumericRangeQuery", q, 5);
	}
	


	//================= Helper methods ===================================
	private Query parse(String xmlFileName) throws ParserException, IOException
	{
		InputStream xmlStream=TestParser.class.getResourceAsStream(xmlFileName);
		Query result=builder.parse(xmlStream);
		xmlStream.close();
		return result;
	}
	private void dumpResults(String qType,Query q, int numDocs) throws IOException
	{
		TopDocs hits = searcher.search(q, null, numDocs);
		assertTrue(qType +" should produce results ", hits.totalHits>0);
		if(VERBOSE)
		{
			System.out.println("========="+qType+"============");
			ScoreDoc[] scoreDocs = hits.scoreDocs;
			for(int i=0;i<Math.min(numDocs,hits.totalHits);i++)
			{
				org.apache.lucene.document.Document ldoc=searcher.doc(scoreDocs[i].doc);
				System.out.println("["+ldoc.get("date")+"]"+ldoc.get("contents"));
			}
			System.out.println();
		}
	}
	

}

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