content: 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;
    }
  }
  