The Jazzy SpellDictionaryCachedDichoDisk.java source code
/*
Jazzy - a Java library for Spell Checking
Copyright (C) 2001 Mindaugas Idzelis
Full text of license can be found in LICENSE.txt
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.swabunga.spell.engine;
import java.io.*;
import java.util.*;
/**
* Yet another <code>SpellDictionary this one is based on Damien Guillaume's
* Diskbased dictionary but adds a cache to try to improve abit on performance.
*
* @author Robert Gustavsson
* @version 0.01
*/
public class SpellDictionaryCachedDichoDisk extends SpellDictionaryDichoDisk {
// Only used for testing to measure the effectiveness of the cache.
static public int hits=0;
static public int codes=0;
public static final String JAZZY_DIR=".jazzy";
public static final String PRE_CACHE_FILE_EXT=".pre";
private static int MAX_CACHED=10000;
private HashMap suggestionCache=new HashMap(MAX_CACHED);
private String preCacheFileName;
private String preCacheDir;
/**
* Dictionary Convienence Constructor.
*/
public SpellDictionaryCachedDichoDisk(File wordList)
throws FileNotFoundException, IOException {
super((File) wordList);
loadPreCache(wordList);
}
/**
* Dictionary Convienence Constructor.
*/
public SpellDictionaryCachedDichoDisk(File wordList, String encoding)
throws FileNotFoundException, IOException {
super(wordList, encoding);
loadPreCache(wordList);
}
/**
* Dictionary constructor that uses an aspell phonetic file to
* build the transformation table.
*/
public SpellDictionaryCachedDichoDisk(File wordList, File phonetic)
throws FileNotFoundException, IOException {
super(wordList, phonetic);
loadPreCache(wordList);
}
/**
* Dictionary constructor that uses an aspell phonetic file to
* build the transformation table.
*/
public SpellDictionaryCachedDichoDisk(File wordList, File phonetic, String encoding)
throws FileNotFoundException, IOException {
super(wordList, phonetic, encoding);
loadPreCache(wordList);
}
/**
* Add a word permanantly to the dictionary (and the dictionary file).
* not implemented !
*/
public void addWord(String word) {
System.err.println("error: addWord is not implemented for SpellDictionaryCachedDichoDisk");
}
/**
* Clears the cache.
*/
public void clearCache(){
suggestionCache.clear();
}
/**
* Returns a list of strings (words) for the code.
*/
public List getWords(String code) {
List list;
codes++;
if(suggestionCache.containsKey(code)){
hits++;
list=getCachedList(code);
return list;
}
list=super.getWords(code);
addToCache(code,list);
return list;
}
/**
* This method returns the cached suggestionlist and also moves the code to
* the top of the codeRefQueue to indicate this code has resentlly been
* referenced.
*/
private List getCachedList(String code){
CacheObject obj=(CacheObject)suggestionCache.get(code);
obj.setRefTime();
return obj.getSuggestionList();
}
/**
* Adds a code and it's suggestion list to the cache.
*/
private void addToCache(String code, List l){
String c=null;
String lowestCode=null;
long lowestTime=Long.MAX_VALUE;
Iterator it;
CacheObject obj;
if(suggestionCache.size()>=MAX_CACHED){
it=suggestionCache.keySet().iterator();
while(it.hasNext()){
c=(String)it.next();
obj=(CacheObject)suggestionCache.get(c);
if(obj.getRefTime()==0){
lowestCode=c;
break;
}
if(lowestTime>obj.getRefTime()){
lowestCode=c;
lowestTime=obj.getRefTime();
}
}
suggestionCache.remove(lowestCode);
}
suggestionCache.put(code,new CacheObject(l));
}
/**
* Load the cache from file. The cach file has the same name as the
* dico file with the .pre extension added.
*/
private void loadPreCache(File dicoFile)throws IOException{
String code;
List suggestions;
long size,
time;
File preFile;
ObjectInputStream in;
preCacheDir=System.getProperty("user.home")+"/"+JAZZY_DIR;
preCacheFileName=preCacheDir+"/"+dicoFile.getName()+PRE_CACHE_FILE_EXT;
//System.out.println(preCacheFileName);
preFile=new File(preCacheFileName);
if(!preFile.exists()){
System.err.println("No precache file");
return;
}
//System.out.println("Precaching...");
in=new ObjectInputStream(new FileInputStream(preFile));
try{
size=in.readLong();
for(int i=0;i
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