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Viewing changes to lucene/contrib/xml-query-parser/src/java/org/apache/lucene/xmlparser/builders/TermsFilterBuilder.java

  • Committer: Sebastian Meyer
  • Date: 2012-08-03 09:12:40 UTC
  • Revision ID: sebastian.meyer@slub-dresden.de-20120803091240-x6861b0vabq1xror
https://launchpad.net/bugs/985487
Remove Lucene and Solr source code and add patches instead
Fix Bug #985487: Auto-suggestion for the search interface

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lucene/contrib/xml-query-parser/src/java/org/apache/lucene/xmlparser/builders/TermsFilterBuilder.java
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package org.apache.lucene.xmlparser.builders;
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import java.io.IOException;
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import java.io.StringReader;
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import org.apache.lucene.analysis.Analyzer;
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import org.apache.lucene.analysis.TokenStream;
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import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
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import org.apache.lucene.index.Term;
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import org.apache.lucene.search.Filter;
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import org.apache.lucene.search.TermsFilter;
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import org.apache.lucene.xmlparser.DOMUtils;
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import org.apache.lucene.xmlparser.FilterBuilder;
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import org.apache.lucene.xmlparser.ParserException;
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import org.w3c.dom.Element;
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/**
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 * Licensed to the Apache Software Foundation (ASF) under one or more
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 * contributor license agreements.  See the NOTICE file distributed with
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 * this work for additional information regarding copyright ownership.
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 * The ASF licenses this file to You under the Apache License, Version 2.0
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 * (the "License"); you may not use this file except in compliance with
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 * the License.  You may obtain a copy of the License at
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 *
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 *     http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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/**
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 * 
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 */
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public class TermsFilterBuilder implements FilterBuilder
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{
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        Analyzer analyzer;
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        /**
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         * @param analyzer
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         */
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        public TermsFilterBuilder(Analyzer analyzer)
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        {
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                this.analyzer = analyzer;
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        }
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        /*
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         * (non-Javadoc)
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         * 
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         * @see org.apache.lucene.xmlparser.FilterBuilder#process(org.w3c.dom.Element)
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         */
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        public Filter getFilter(Element e) throws ParserException
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        {
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                TermsFilter tf = new TermsFilter();
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                String text = DOMUtils.getNonBlankTextOrFail(e);
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                String fieldName = DOMUtils.getAttributeWithInheritanceOrFail(e, "fieldName");
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                try
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                {
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            TokenStream ts = analyzer.reusableTokenStream(fieldName, new StringReader(text));
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            CharTermAttribute termAtt = ts.addAttribute(CharTermAttribute.class);
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                        Term term = null;
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      ts.reset();
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              while (ts.incrementToken()) {
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                                if (term == null)
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                                {
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                                        term = new Term(fieldName, termAtt.toString());
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                                } else
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                                {
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//                                       create from previous to save fieldName.intern overhead
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                                        term = term.createTerm(termAtt.toString()); 
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                                }
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                                tf.addTerm(term);
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                        }
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            ts.end();
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            ts.close();
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                } 
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                catch (IOException ioe)
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                {
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                        throw new RuntimeException("Error constructing terms from index:"
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                                        + ioe);
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                }
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                return tf;
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        }
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}