org.apache.uima.lucas.indexer.Tokenizer.java Source code

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Here is the source code for org.apache.uima.lucas.indexer.Tokenizer.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.uima.lucas.indexer;

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

import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.WhitespaceTokenizer;
import org.apache.lucene.analysis.standard.StandardTokenizer;
import org.apache.uima.lucas.indexer.mapping.AnnotationDescription;
import org.apache.uima.lucas.indexer.util.TokenStreamStringConcatenator;

public class Tokenizer {
    public static final String TOKENIZER_WHITESPACE = "whitespace";

    public static final String TOKENIZER_CAS = "cas";

    public static final String TOKENIZER_STANDARD = "standard";

    private TokenStreamStringConcatenator tokenStreamStringConcatenator;

    public Tokenizer() {
        tokenStreamStringConcatenator = new TokenStreamStringConcatenator();
    }

    public boolean needsTokenization(AnnotationDescription annotationDescription) {
        String tokenizer = annotationDescription.getTokenizer();
        return tokenizer != null && !tokenizer.equals(TOKENIZER_CAS);
    }

    public TokenStream tokenize(TokenStream tokenStream, AnnotationDescription description) throws IOException {
        String tokenizer = description.getTokenizer();
        if (tokenizer != null && !tokenizer.equals(TOKENIZER_CAS)) {
            String tokenStreamAsString = tokenStreamStringConcatenator.tokenStreamToStringWithDelimiter(tokenStream,
                    " ");
            StringReader stringReader = new StringReader(tokenStreamAsString);
            if (tokenizer.equals(TOKENIZER_WHITESPACE))
                tokenStream = new WhitespaceTokenizer(stringReader);
            else if (tokenizer.equals(TOKENIZER_STANDARD))
                tokenStream = new StandardTokenizer(stringReader);
        }

        return tokenStream;
    }
}