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From dna...@apache.org
Subject cvs commit: jakarta-lucene/src/java/org/apache/lucene/analysis WordlistLoader.java
Date Mon, 16 Aug 2004 20:41:02 GMT
dnaber      2004/08/16 13:41:02

  Added:       src/java/org/apache/lucene/analysis WordlistLoader.java
  Log:
  move the word list loader from analysis.de to analysis, as it is not specific to German
at all
  
  Revision  Changes    Path
  1.1                  jakarta-lucene/src/java/org/apache/lucene/analysis/WordlistLoader.java
  
  Index: WordlistLoader.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.File;
  import java.io.FileReader;
  import java.io.IOException;
  import java.io.LineNumberReader;
  import java.util.HashSet;
  import java.util.Hashtable;
  import java.util.Iterator;
  
  /**
   * Loader for text files that represent a list of stopwords.
   *
   * @author Gerhard Schwarz
   * @version $Id: WordlistLoader.java,v 1.1 2004/08/16 20:41:02 dnaber Exp $
   */
  public class WordlistLoader {
  
    /**
     * Loads a text file and adds every line as an entry to a HashSet (omitting
     * leading and trailing whitespace). Every line of the file should contain only 
     * one word. The words need to be in lowercase if you make use of an
     * Analyzer which uses LowerCaseFilter (like GermanAnalyzer).
     * 
     * @param wordfile File containing the wordlist
     * @return A HashSet with the file's words
     */
    public static HashSet getWordSet(File wordfile) throws IOException {
      HashSet result = new HashSet();
      FileReader freader = null;
      LineNumberReader lnr = null;
      try {
        freader = new FileReader(wordfile);
        lnr = new LineNumberReader(freader);
        String word = null;
        while ((word = lnr.readLine()) != null) {
          result.add(word.trim());
        }
      }
      finally {
        if (lnr != null)
          lnr.close();
        if (freader != null)
          freader.close();
      }
      return result;
    }
  
    /**
     * @param path      Path to the wordlist
     * @param wordfile  Name of the wordlist
     * 
     * @deprecated Use {@link #getWordSet(File)} getWordSet(File)} instead
     */
    public static Hashtable getWordtable(String path, String wordfile) throws IOException
{
      return getWordtable(new File(path, wordfile));
    }
  
    /**
     * @param wordfile  Complete path to the wordlist
     * 
     * @deprecated Use {@link #getWordSet(File)} getWordSet(File)} instead
     */
    public static Hashtable getWordtable(String wordfile) throws IOException {
      return getWordtable(new File(wordfile));
    }
  
    /**
     * @param wordfile  File object that points to the wordlist
     *
     * @deprecated Use {@link #getWordSet(File)} getWordSet(File)} instead
     */
    public static Hashtable getWordtable(File wordfile) throws IOException {
      HashSet wordSet = (HashSet)getWordSet(wordfile);
      Hashtable result = makeWordTable(wordSet);
      return result;
    }
  
    /**
     * Builds a wordlist table, using words as both keys and values
     * for backward compatibility.
     *
     * @param wordSet   stopword set
     */
    private static Hashtable makeWordTable(HashSet wordSet) {
      Hashtable table = new Hashtable();
      for (Iterator iter = wordSet.iterator(); iter.hasNext();) {
        String word = (String)iter.next();
        table.put(word, word);
      }
      return table;
    }
  }
  
  
  

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