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Lucene example source code file (TermsQueryBuilder.java)

This example Lucene source code file (TermsQueryBuilder.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

booleanclause, booleanquery, dom, io, ioexception, parserexception, runtimeexception, string, string, stringreader, term, term, termsquerybuilder, termsquerybuilder, tokenstream, tokenstream

The Lucene TermsQueryBuilder.java source code

package org.apache.lucene.xmlparser.builders;

import java.io.IOException;
import java.io.StringReader;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.xmlparser.DOMUtils;
import org.apache.lucene.xmlparser.ParserException;
import org.apache.lucene.xmlparser.QueryBuilder;
import org.w3c.dom.Element;

 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * Builds a BooleanQuery from all of the terms found in the XML element using the choice of analyzer
public class TermsQueryBuilder implements QueryBuilder {

	Analyzer analyzer;

	public TermsQueryBuilder(Analyzer analyzer)
		this.analyzer = analyzer;

	public Query getQuery(Element e) throws ParserException {
        String fieldName=DOMUtils.getAttributeWithInheritanceOrFail(e,"fieldName");
 		String text=DOMUtils.getNonBlankTextOrFail(e);
		BooleanQuery bq=new BooleanQuery(DOMUtils.getAttribute(e,"disableCoord",false));
	    TokenStream ts = analyzer.reusableTokenStream(fieldName, new StringReader(text));
      CharTermAttribute termAtt = ts.addAttribute(CharTermAttribute.class);
			Term term = null;
			while (ts.incrementToken()) {
				if (term == null)
					term = new Term(fieldName, termAtt.toString());
				} else
//					 create from previous to save fieldName.intern overhead
					term = term.createTerm(termAtt.toString()); 
				bq.add(new BooleanClause(new TermQuery(term),BooleanClause.Occur.SHOULD));
		catch (IOException ioe)
			throw new RuntimeException("Error constructing terms from index:"
					+ ioe);

  		return bq;


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