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Lucene example source code file (FileDictionary.java)

This example Lucene source code file (FileDictionary.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

bufferedreader, bufferedreader, dictionary, filedictionary, filedictionary, inputstreamreader, io, ioexception, runtimeexception, string, string, termfreqiterator, termfreqiterator, unsupportedoperationexception

The Lucene FileDictionary.java source code

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:
* 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(); } } }

Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene FileDictionary.java source code file:

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