org.apache.lucene.analysis.miscellaneous.TruncateTokenFilter Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
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*/
package org.apache.lucene.analysis.miscellaneous;
import org.apache.lucene.analysis.TokenFilter;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import java.io.IOException;
/**
* A token filter that truncates tokens.
*/
public class TruncateTokenFilter extends TokenFilter {
private final CharTermAttribute termAttribute = addAttribute(CharTermAttribute.class);
private final int size;
public TruncateTokenFilter(TokenStream in, int size) {
super(in);
this.size = size;
}
@Override
public final boolean incrementToken() throws IOException {
if (input.incrementToken()) {
final int length = termAttribute.length();
if (length > size) {
termAttribute.setLength(size);
}
return true;
} else {
return false;
}
}
}