cvs commit: jakarta-lucene-sandbox/contributions/analyzers/src/java/org/apache/lucene/analysis LengthFilter.java

[ot...@apache.org]

otis        2004/03/02 04:52:16

  Added:       contributions/analyzers/src/java/org/apache/lucene/analysis
                        LengthFilter.java
  Log:
  - Initial commit.
    Contribution from David Spencer.
  
  Revision  Changes    Path
  1.1                  jakarta-lucene-sandbox/contributions/analyzers/src/java/org/apache/lucene/analysis/LengthFilter.java
  
  Index: LengthFilter.java
  ===================================================================
  package org.apache.lucene.analysis;
  
  /**
   * Copyright 2004 The Apache Software Foundation
   *
   * Licensed 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;
  
  /**
   * Removes words that are too long and too short from the stream.
   *
   * @author David Spencer
   * @version $Id: LengthFilter.java,v 1.1 2004/03/02 12:52:16 otis Exp $
   */
  public final class LengthFilter extends TokenFilter {
  
    final int min;
    final int max;
  
    /**
     * Build a filter that removes words that are too long or too
     * short from the text.
     */
    public LengthFilter(TokenStream in, int min, int max)
    {
      input = in;
      this.min = min;
      this.max =max;
    }
  
    /**
     * Returns the next input Token whose termText() is the right len
     */
    public final Token next() throws IOException
    {
      // return the first non-stop word found
      for (Token token = input.next(); token != null; token = input.next())
      {
        int len = token.termText().length();
        if ( len >= min && len <= max) {
            return token;
        }
        // note: else we ignore it but should we index each part of it?
      }
      // reached EOS -- return null
      return null;
    }
  }
  
  
  

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