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();
}
}
}