org.apache.solr.spelling.SimpleQueryConverter.java Source code

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Here is the source code for org.apache.solr.spelling.SimpleQueryConverter.java

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/*
 * 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.
 */
package org.apache.solr.spelling;

import org.apache.lucene.analysis.Token;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.core.WhitespaceAnalyzer;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.FlagsAttribute;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.tokenattributes.PayloadAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
import org.apache.lucene.analysis.tokenattributes.TypeAttribute;
import org.apache.lucene.util.IOUtils;
import org.apache.lucene.util.Version;

import java.util.Collection;
import java.util.HashSet;
import java.io.IOException;

/**
 *
 * @since solr 1.3
 **/
class SimpleQueryConverter extends SpellingQueryConverter {

    @Override
    public Collection<Token> convert(String origQuery) {
        Collection<Token> result = new HashSet<Token>();
        WhitespaceAnalyzer analyzer = new WhitespaceAnalyzer(Version.LUCENE_40);

        TokenStream ts = null;
        try {
            ts = analyzer.tokenStream("", origQuery);
            // TODO: support custom attributes
            CharTermAttribute termAtt = ts.addAttribute(CharTermAttribute.class);
            OffsetAttribute offsetAtt = ts.addAttribute(OffsetAttribute.class);
            TypeAttribute typeAtt = ts.addAttribute(TypeAttribute.class);
            FlagsAttribute flagsAtt = ts.addAttribute(FlagsAttribute.class);
            PayloadAttribute payloadAtt = ts.addAttribute(PayloadAttribute.class);
            PositionIncrementAttribute posIncAtt = ts.addAttribute(PositionIncrementAttribute.class);

            ts.reset();

            while (ts.incrementToken()) {
                Token tok = new Token();
                tok.copyBuffer(termAtt.buffer(), 0, termAtt.length());
                tok.setOffset(offsetAtt.startOffset(), offsetAtt.endOffset());
                tok.setFlags(flagsAtt.getFlags());
                tok.setPayload(payloadAtt.getPayload());
                tok.setPositionIncrement(posIncAtt.getPositionIncrement());
                tok.setType(typeAtt.type());
                result.add(tok);
            }
            ts.end();
            return result;
        } catch (IOException e) {
            throw new RuntimeException(e);
        } finally {
            IOUtils.closeWhileHandlingException(ts);
        }
    }
}