de.uni_koeln.spinfo.maalr.lucene.util.TokenizerHelper.java Source code

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/*******************************************************************************
 * Copyright 2013 Sprachliche Informationsverarbeitung, University of Cologne
 * 
 * Licensed 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 de.uni_koeln.spinfo.maalr.lucene.util;

import java.io.IOException;
import java.io.StringReader;

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

public class TokenizerHelper {

    public static String tokenizeString(Analyzer analyzer, String string) {
        // Inspired by stackoverflow:
        // http://stackoverflow.com/questions/6334692/how-to-use-a-lucene-analyzer-to-tokenize-a-string
        StringBuilder builder = new StringBuilder();
        try {
            TokenStream stream = analyzer.tokenStream(null, new StringReader(string));
            stream.reset();
            while (stream.incrementToken()) {
                builder.append(stream.getAttribute(CharTermAttribute.class).toString());
                builder.append(" ");
            }
            stream.close();
        } catch (IOException e) {
            // not thrown b/c we're using a string reader...
            throw new RuntimeException(e);
        }
        return builder.toString().trim();
    }

}