/*
 * File    : ResourceManager.java
 * Created : 07-mar-2002 17:11
 * By      : fbusquets
 *
 * JClic - Authoring and playing system for educational activities
 *
 * Copyright (C) 2000 - 2005 Francesc Busquets & Departament
 * d'Educacio de la Generalitat de Catalunya
 *
 * 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 (see the LICENSE file).
 */

package edu.xtec.util;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.HashMap;
import javax.swing.ImageIcon;

/**
 *
 * @author Francesc Busquets (fbusquets@xtec.net)
 * @version 1.0
 */
public abstract class ResourceManager{
    
    public static final String RESOURCE_ROOT="/edu/xtec/resources/";
    public static final String RESOURCE_CLASS_ROOT="edu.xtec.resources.";
    public static final StreamIO.InputStreamProvider STREAM_PROVIDER=new StreamIO.InputStreamProvider(){
        public java.io.InputStream getInputStream(String resourceName) throws Exception{
            return getResourceAsStream(resourceName);
        }
    };
    public static final String DEFAULT_LOCALE="en";
    private static HashMap icons=new HashMap();
    
    public static ImageIcon getImageIcon(String name){
        ImageIcon result=(ImageIcon)icons.get(name);
        if(result==null){
            try{
                result=new ImageIcon(getResource(name));
                String s=name;
                if(s.startsWith("icons/"))
                    s=new StringBuffer("@").append(s.substring(6)).substring(0);
                result.setDescription(s);
                icons.put(name, result);
            } catch(Exception ex){
                System.err.println("unable to get image "+name);
                System.err.println(ex);
            }
        }
        return result;
    }
    
    public static java.net.URL getResource(String name) throws Exception{
        java.net.URL result=ResourceManager.class.getResource(RESOURCE_ROOT+name);
        if(result==null)
            throw buildException(name);
        return result;
    }
    
    public static java.io.InputStream getResourceAsStream(String name) throws Exception{
        java.io.InputStream result=ResourceManager.class.getResourceAsStream(RESOURCE_ROOT+name);
        if(result==null)
            throw buildException(name);
        return result;
    }
    
    public static byte[] getResourceBytes(String name) throws Exception{
        return StreamIO.readInputStream(getResourceAsStream(name));
    }
    
    public static ExtendedByteArrayInputStream getResourceAsByteArray(String name) throws Exception{
        return new ExtendedByteArrayInputStream(getResourceBytes(name), name);
    }
    
    public static String getResourceText(String name, boolean useCRLF) throws Exception{
        
        String lineEnding = useCRLF ? "\r\n" : System.getProperty("line.separator");        
        BufferedReader in=new BufferedReader(new InputStreamReader(getResourceAsStream(name)));
        StringBuffer sb=new StringBuffer();
        String line=null;
        while((line=in.readLine())!=null){
            sb.append(line).append(lineEnding);                    
        }
        in.close();
        return sb.substring(0);        
    }
        
    public static java.util.ResourceBundle getBundle(String name, java.util.Locale locale) throws Exception{
        if(locale!=null && DEFAULT_LOCALE.equals(locale.getLanguage()))
            locale.setDefault(locale);
        java.util.ResourceBundle result=java.util.ResourceBundle.getBundle(RESOURCE_CLASS_ROOT+name, locale);            
        if(result==null)
            throw buildException(name);
        return result;
    }
    
    private static Exception buildException(String name){
        return new Exception("Unable to load resource: "+name);
    }    
}