resource.java

为了下东西 随便发了个 datamining 的源代码

/*
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program 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 General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * Created on 2006/3/06
 *
 * @Author: Xiaojun Chen
 * $Revision$ 1.0
 *
 */

package eti.bi.common.Locale;

import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Locale;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import eti.bi.alphaminer.core.observer.Observer;
import eti.bi.common.MLPropertyResourceBundle;
import eti.bi.common.PluginResource;
import eti.bi.common.System.SysLog;

public final class Resource{
	
	public final static String CHANGE_LOCALE = "change locale";
	
	private static locale locale;
	
	private static MLPropertyResourceBundle pr = new MLPropertyResourceBundle();
	
	private static LinkedList<PluginResource> paths = new LinkedList<PluginResource>();
	
	private static LinkedList<Observer> observers = new LinkedList<Observer>();
	
	public static void setCurrentLocale(locale currentlocale) {
		locale = currentlocale;
	}
	
	public static synchronized void initialize() throws Exception{
		if(locale==null) {
			throw new NullPointerException("The Locale is null!");
		}
		String path = locale.getFile();
		String charsetName = locale.getCharsetName();
		String filename = locale.getBasePath()+File.separator+path;
		JarFile jarFile = new JarFile(filename);
		JarEntry jarEntry = jarFile.getJarEntry("language.properties");
		if(jarEntry==null) {
			throw new NullPointerException("The language.properties hasn't been found!");
		}
		InputStream in = jarFile.getInputStream(jarEntry);
		pr.addResource(in,charsetName);
		in.close();
		
		//other resource
		int size = paths.size();
		PluginResource plr;
		JarFile jarfile;
		JarEntry jarentry;
		path += "!/language.properties";
		for(int i=0;i<size;i++){
			plr = paths.get(i);
			try {
				jarfile = plr.jarfile;
				jarentry = jarfile.getJarEntry(getLocalePathForPlugin(plr.localepath)+"language.properties");
				in = jarfile.getInputStream(jarentry);
				pr.addResource(in,charsetName);
				in.close();
			}
			catch(Exception e) {
				e.printStackTrace();
			}
		}
		jarfile = null;
		jarentry = null;
		
		in.close();
	}
	
	public static void switchLocale() throws Exception {
		initialize();
		sendNotify();
	}
	
	/**
	 * Get the string for a give key from resource
	 * @param key the key for the desired string
	 * @param defStr the default string to return if not found the string for this key
	 * @return the string for the given key. If not found the string for this key, just return defStr 
	 * */
	public static synchronized String srcStr(String key,String defStr) {
		String ret = "";
		try {
			
			ret = pr.getString(key);
			if(ret==null){
				return defStr;
			}
			return ret;
		} catch (Exception e) {
			SysLog.error(null,e);
			return defStr;
		}
	}
	
	/**
	 * Get the string for a give key from resource
	 * @param key the key for the desired string
	 * @return the string for the given key. If not found the string for this key, just return key 
	 * */
	public static synchronized String srcStr(String key) {
		String ret = "";
		try {
			
			ret = pr.getString(key);
			
			if(ret==null){
				return key;
			}
			return ret;
		} catch (Exception e) {
			SysLog.error(null,e);
			return key;
		}
	}
	
	public static locale getLocale(){
		return locale;
	}
	
	public static String getBasePath() {
		return locale.getBasePath();
	}
	
	public static String getFile() {
		return locale.getFile();
	}
	
	public static String getWholePath() {
		return locale.getBasePath()+"/"+locale.getFile();
	}
	
	public static String getCharsetName() {
		return locale.getCharsetName();
	}
	
	public static String getLocalePath(String localedir){
		if(localedir==null){
			return null;
		}
		return localedir+File.separator + locale.getFile()+"/";
	}
	
	public static String getLocalePathForPlugin(String localedir){
		if(localedir==null){
			return null;
		}
		String file = locale.getFile();
		if(file!=null && file.indexOf(".jar")>0){
			file = file.substring(0, file.length()-4);
		}
		
		return localedir+ "/" + file+"/";
	}
	
	public static String getLocalePathinJar(String localedir){
		if(localedir==null){
			return null;
		}
		if(locale.getLocaleStrng()!=null) {
			return localedir+"/" + locale.getLocaleStrng()+"/";
		}
		
		String file = locale.getFile();
		if(file==null) {
			return null;
		}
		if(file.endsWith(".jar")) {
			file = file.substring(0, file.length()-4);
		}
		return localedir+"/" + file+"/";
	}
	
	public static URL getflashImageURL() throws MalformedURLException {
		return eti.bi.common.SystemAdapter.JarURL(getWholePath()+"!/splash.png");
	}
	
	public static void registerPluginResource(PluginResource resourcepath) throws IOException{
		if(resourcepath==null){
			throw new IOException("No file defined");
		}
		if(!resourcepath.isvalid()){
			return;
		}
		JarEntry jarentry;
		JarFile jarfile = resourcepath.jarfile;
		jarentry = jarfile.getJarEntry(getLocalePathForPlugin(resourcepath.localepath)+"language.properties");
		InputStream in = jarfile.getInputStream(jarentry);
		if(locale!=null){
			pr.addResource(in, locale.getCharsetName());
		}
		jarfile = null;
		in.close();
		paths.add(resourcepath);
	}
	
	public static void close(){
		
	}

	/**
	 * register locale observer
	 * */
	public static void registerInterest(Observer a_Observer) {
		observers.add(a_Observer);
	}
	
	public static void removeIntereat(Observer a_Observer) {
		observers.remove(a_Observer);
	}
	
	/**
	 * send locale notify to all observer
	 * */
	private static void sendNotify() {
		Iterator<Observer> iterator = observers.iterator();
		while(iterator.hasNext()) {
			iterator.next().sendNotify(CHANGE_LOCALE);
		}
	}
	
	/**
	 * @param aLocale a Locale
	 * @return <code>true<code> if aLocale is equal to the current Locale
	 * */
	public static boolean equalLocale(Locale aLocale) {
		if(aLocale==null) {
			return false;
		}
		String ls = locale.getLocaleStrng();
		if(ls==null) {
			return false;
		}
		if(ls.equals(aLocale.getCountry())||ls.equals(aLocale.getLanguage())||ls.equals(aLocale.toString())) {
			return true;
		}
		else {
			return false;
		}
	}

	
}