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Lucene example source code file (LengthFilter.java)

This example Lucene source code file (LengthFilter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

chartermattribute, deprecated, deprecated, filteringtokenfilter, filteringtokenfilter, io, ioexception, lengthfilter, lengthfilter, override, tokenstream, tokenstream

The Lucene LengthFilter.java source code

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;

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

/**
 * Removes words that are too long or too short from the stream.
 * <p>
 * Note: Length is calculated as the number of UTF-16 code units.
 * </p>
 */
public final class LengthFilter extends FilteringTokenFilter {

  private final int min;
  private final int max;
  
  private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);

  /**
   * Build a filter that removes words that are too long or too
   * short from the text.
   */
  public LengthFilter(boolean enablePositionIncrements, TokenStream in, int min, int max) {
    super(enablePositionIncrements, in);
    this.min = min;
    this.max = max;
  }
  
  /**
   * Build a filter that removes words that are too long or too
   * short from the text.
   * @deprecated Use {@link #LengthFilter(boolean, TokenStream, int, int)} instead.
   */
  @Deprecated
  public LengthFilter(TokenStream in, int min, int max) {
    this(false, in, min, max);
  }
  
  @Override
  public boolean accept() throws IOException {
    final int len = termAtt.length();
    return (len >= min && len <= max);
  }
}

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