content: package org.apache.lucene.search.suggest;
  
  /**
   * 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.*;
  
  import org.apache.lucene.search.spell.Dictionary;
  import org.apache.lucene.search.spell.TermFreqIterator;
  
  
  /**
   * Dictionary represented by a text file.
   * 
   * <p/>Format allowed: 1 string per line, optionally with a tab-separated integer value:<br/>
   * word1 TAB 100<br/>
   * word2 word3 TAB 101<br/>
   * word4 word5 TAB 102<br/>
   */
  public class FileDictionary implements Dictionary {
  
    private BufferedReader in;
    private String line;
    private boolean hasNextCalled;
  
    public FileDictionary(InputStream dictFile) {
      in = new BufferedReader(new InputStreamReader(dictFile));
    }
  
    /**
     * Creates a dictionary based on a reader.
     */
    public FileDictionary(Reader reader) {
      in = new BufferedReader(reader);
    }
  
    public TermFreqIterator getWordsIterator() {
      return new fileIterator();
    }
  
    final class fileIterator implements TermFreqIterator {
      private float curFreq;
      
      public String next() {
        if (!hasNextCalled) {
          hasNext();
        }
        hasNextCalled = false;
        return line;
      }
      
      public float freq() {
        return curFreq;
      }
  
      public boolean hasNext() {
        hasNextCalled = true;
        try {
          line = in.readLine();
          if (line != null) {
            String[] fields = line.split("\t");
            if (fields.length > 1) {
              curFreq = Float.parseFloat(fields[1]);
              line = fields[0];
            } else {
              curFreq = 1;
            }
          }
        } catch (IOException ex) {
          throw new RuntimeException(ex);
        }
        return (line != null) ? true : false;
      }
  
      public void remove() {
        throw new UnsupportedOperationException();
      }
    }
  
  }
  