package org.apache.lucene.queryparser.xml.builders;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.TermToBytesRefAttribute;
import org.apache.lucene.search.Filter;
import org.apache.lucene.queries.TermsFilter;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.IOUtils;
import org.apache.lucene.queryparser.xml.DOMUtils;
import org.apache.lucene.queryparser.xml.FilterBuilder;
import org.apache.lucene.queryparser.xml.ParserException;
import org.w3c.dom.Element;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/*
* 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.
*/
/**
* Builder for {@link TermsFilter}
*/
public class TermsFilterBuilder implements FilterBuilder {
private final Analyzer analyzer;
public TermsFilterBuilder(Analyzer analyzer) {
this.analyzer = analyzer;
}
/*
* (non-Javadoc)
*
* @see org.apache.lucene.xmlparser.FilterBuilder#process(org.w3c.dom.Element)
*/
@Override
public Filter getFilter(Element e) throws ParserException {
List<BytesRef> terms = new ArrayList<BytesRef>();
String text = DOMUtils.getNonBlankTextOrFail(e);
String fieldName = DOMUtils.getAttributeWithInheritanceOrFail(e, "fieldName");
TokenStream ts = null;
try {
ts = analyzer.tokenStream(fieldName, text);
TermToBytesRefAttribute termAtt = ts.addAttribute(TermToBytesRefAttribute.class);
BytesRef bytes = termAtt.getBytesRef();
ts.reset();
while (ts.incrementToken()) {
termAtt.fillBytesRef();
terms.add(BytesRef.deepCopyOf(bytes));
}
ts.end();
}
catch (IOException ioe) {
throw new RuntimeException("Error constructing terms from index:" + ioe);
} finally {
IOUtils.closeWhileHandlingException(ts);
}
return new TermsFilter(fieldName, terms);
}
}