xresourcemanager.java

XBrowser是一个完全免费并且开源的Web浏览器

/****************************************************************
*              XBrowser  -  eXtended web Browser                *
*                                                               *
*           Copyright (c) 2000-2001  Armond Avanes              *
*     Refer to ReadMe & License files for more information      *
*                                                               *
*                                                               *
*                      By: Armond Avanes                        *
*       [e-mail]     &    [e-mail]        *
*                http://xbrowser.sourceforge.net/               *
*****************************************************************/
package xbrowser.util;

import java.io.*;
import java.net.*;
import java.util.*;

import xbrowser.*;

public final class XResourceManager
{
	public XResourceManager(ClassLoader class_loader)
	{
		myClassLoader = class_loader;
	}

	public void initResourceBundle(String res_bundle_name)
	{
		try
		{
			resourceBundle = ResourceBundle.getBundle(res_bundle_name, Locale.getDefault(), myClassLoader);
		}
		catch( Exception e )
		{
			XRepository.getLogger().error(this, "An error occured while trying to load the properties file : "+res_bundle_name);
			XRepository.getLogger().error(this, e);
		}
	}

	public URL getResourceURL(String resource_key)
	{
		return myClassLoader.getResource(resource_key);
	}

	public URL getResourceURL(Object owner, String key)
	{
		try
		{
			return getResourceURL( getProperty(owner, key) );
		}
		catch( MissingResourceException e )
		{
			//XRepository.getLogger().warning(this, e);
			return null;
		}
	}

	public String getClassName(Object obj)
	{
		return getClassName(obj.getClass());
	}

	public String getClassName(Class cls)
	{
	String package_name = cls.getPackage().getName();
	String class_name = cls.getName().substring(package_name.length()+1);

		return class_name;
	}

	public String getProperty(Object owner, String key)
	{
		return resourceBundle.getString(getClassName(owner)+"."+key);
	}

	public String getProperty(Class owner, String key)
	{
		return resourceBundle.getString(getClassName(owner)+"."+key);
	}

	public String getProperty(Object owner, String key, Object arg)
	{
	String property = getProperty(owner, key);
	Object[] arguments = {arg};
	String result = java.text.MessageFormat.format(property, arguments);

		return result;
	}

	public String getProperty(Object owner, String key, Object arg1, Object arg2)
	{
	String property = getProperty(owner, key);
	Object[] arguments = {arg1, arg2};
	String result = java.text.MessageFormat.format(property, arguments);

		return result;
	}

	public Object loadObject(String class_name, String resource) throws Exception
	{
		return loadObject(class_name, createClassLoaderForResource(resource));
	}

	public Object loadObject(String class_name, ClassLoader cl) throws Exception
	{
		try
		{
		Class renderer_class = Class.forName(class_name, true, cl);
		Object obj = renderer_class.newInstance();

			return obj;
		}
		catch( Exception e )
		{
			XRepository.getLogger().error(this, "An error occured on loading the object: "+class_name);
			XRepository.getLogger().error(this, e);
			throw e;
		}
	}

	public ClassLoader createClassLoaderForResource(String resource)
	{
		if( resource==null || resource.trim().equals("") )
			return myClassLoader;

	LinkedList url_list = new LinkedList();
	StringTokenizer tokenizer = new StringTokenizer(resource, ",;");

		while( tokenizer.hasMoreTokens() )
		{
			try
			{
			File file = new File(tokenizer.nextToken());

				//url_list.add(new URL(file.toString()));
				url_list.add(file.toURL());
			}
			catch( Exception e )
			{
				XRepository.getLogger().warning(this, "An error occured on creating ClassLoader from resources!");
				XRepository.getLogger().warning(this, e);
			}
		}

	URL[] urls = (URL[])url_list.toArray(new URL[url_list.size()]);

		return( new URLClassLoader(urls, myClassLoader) );
	}

	public ClassLoader createBuiltInClassLoader(String built_in_resource, ClassLoader parent)
	{
		if( built_in_resource==null || built_in_resource.trim().equals("") )
			return parent;

	LinkedList url_list = new LinkedList();
	StringTokenizer tokenizer = new StringTokenizer(built_in_resource, ",;");

		while( tokenizer.hasMoreTokens() )
		{
			try
			{
			File file = new File(tokenizer.nextToken());

				url_list.add(file.toURL());
			}
			catch( Exception e )
			{
				XRepository.getLogger().warning(this, "An error occured on creating Built-In-Resource ClassLoader!");
				XRepository.getLogger().warning(this, e);
			}
		}

		if( parent instanceof URLClassLoader )
		{
		URL[] parent_urls = ((URLClassLoader)parent).getURLs();

			for( int i=0; i<parent_urls.length; i++ )
				url_list.add(parent_urls[i]);

		URL[] urls = (URL[])url_list.toArray(new URL[url_list.size()]);

			return( new URLClassLoader(urls, myClassLoader) );
		}
		else
		{
		URL[] urls = (URL[])url_list.toArray(new URL[url_list.size()]);

			return( new URLClassLoader(urls, parent) );
		}
	}

	public ClassLoader buildClassLoaderForApplet(URL code_base, String archive)
	{
	LinkedList url_list = new LinkedList();

		url_list.add(code_base);

		if( archive!=null )
		{
		StringTokenizer tokenizer = new StringTokenizer(archive, ",;");

			while( tokenizer.hasMoreTokens() )
			{
				try
				{
					url_list.add( new URL(code_base, tokenizer.nextToken()) );
				}
				catch( Exception e )
				{
					XRepository.getLogger().warning(this, "An error occured on building ClassLoader for loading applet!");
					XRepository.getLogger().warning(this, e);
				}
			}
		}

	URL[] urls = (URL[])url_list.toArray(new URL[url_list.size()]);

		// return( new XBrowserClassLoader(urls) );
		return ( new URLClassLoader(urls) );
	}

	public void checkForResourceExistence(String filename)
	{
	File file = new File(filename);

		if( file.exists() )
				return;

	URL url = myClassLoader.getResource(filename);

		if( url==null )
			return;

	InputStream in_stream = null;
	OutputStream out_stream = null;

		try
		{
		int b;

			in_stream = url.openStream();
			out_stream = new FileOutputStream(file);

			while( (b=in_stream.read())!=-1 )
					out_stream.write(b);

		}
		catch( Exception ex )
		{
			XRepository.getLogger().warning(this, ex);
		}
		finally
		{
			try
			{
				in_stream.close();
				out_stream.close();
			}
			catch( Exception ex2 )
			{
			}
		}
	}

// Attributes:
	private ResourceBundle resourceBundle = null;
	private ClassLoader myClassLoader = null;
}