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.Token;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.TermsFilter;
import org.apache.lucene.xmlparser.DOMUtils;
import org.apache.lucene.xmlparser.FilterBuilder;
import org.apache.lucene.xmlparser.ParserException;
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,
* 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.
*/
/**
* @author maharwood
*/
public class TermsFilterBuilder implements FilterBuilder
{
Analyzer analyzer;
/**
* @param analyzer
*/
public TermsFilterBuilder(Analyzer analyzer)
{
this.analyzer = analyzer;
}
/*
* (non-Javadoc)
*
* @see org.apache.lucene.xmlparser.FilterBuilder#process(org.w3c.dom.Element)
*/
public Filter getFilter(Element e) throws ParserException
{
TermsFilter tf = new TermsFilter();
String text = DOMUtils.getNonBlankTextOrFail(e);
String fieldName = DOMUtils.getAttributeWithInheritanceOrFail(e, "fieldName");
TokenStream ts = analyzer.tokenStream(fieldName, new StringReader(text));
try
{
Token token = ts.next();
Term term = null;
while (token != null)
{
if (term == null)
{
term = new Term(fieldName, token.termText());
} else
{
// create from previous to save fieldName.intern overhead
term = term.createTerm(token.termText());
}
tf.addTerm(term);
token = ts.next();
}
}
catch (IOException ioe)
{
throw new RuntimeException("Error constructing terms from index:"
+ ioe);
}
return tf;
}
}