org.opencloudengine.flamingo.mapreduce.util.Lucene4Utils.java Source code

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Here is the source code for org.opencloudengine.flamingo.mapreduce.util.Lucene4Utils.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.opencloudengine.flamingo.mapreduce.util;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;

import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;

/**
 * @author Edward KIM
 * @since 0.3
 */
public class Lucene4Utils {

    public static List<String> tokenizeString(Analyzer analyzer, String string) throws IOException {
        List<String> result = new ArrayList<String>();
        TokenStream tokenStream = analyzer.tokenStream("default", new StringReader(string));
        OffsetAttribute offsetAttribute = tokenStream.addAttribute(OffsetAttribute.class);
        CharTermAttribute charTermAttribute = tokenStream.addAttribute(CharTermAttribute.class);

        while (tokenStream.incrementToken()) {
            int startOffset = offsetAttribute.startOffset();
            int endOffset = offsetAttribute.endOffset();
            result.add(charTermAttribute.toString());
        }
        return result;
    }

}