package org.apache.lucene.analysis;
/**
* 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.
*/
import java.io.IOException;
/**
* This TokenFilter limits the number of tokens while indexing. It is
* a replacement for the maximum field length setting inside {@link org.apache.lucene.index.IndexWriter}.
*/
public final class LimitTokenCountFilter extends TokenFilter {
private final int maxTokenCount;
private int tokenCount = 0;
/**
* Build a filter that only accepts tokens up to a maximum number.
*/
public LimitTokenCountFilter(TokenStream in, int maxTokenCount) {
super(in);
this.maxTokenCount = maxTokenCount;
}
@Override
public boolean incrementToken() throws IOException {
if (tokenCount < maxTokenCount && input.incrementToken()) {
tokenCount++;
return true;
}
return false;
}
@Override
public void reset() throws IOException {
super.reset();
tokenCount = 0;
}
}