/**
* ================================================
* LibLoader : a free Java resource loading library
* ================================================
*
* Project Info: http://reporting.pentaho.org/libloader/
*
* (C) Copyright 2006, by Pentaho Corporation and Contributors.
*
* 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., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
*
* ------------
* $Id: ClassloaderResourceLoader.java,v 1.6 2007/04/01 13:43:17 taqua Exp $
* ------------
* (C) Copyright 2006, by Pentaho Corporation.
*/
package org.jfree.resourceloader.loader.resource;
import java.util.HashMap;
import java.util.Map;
import java.net.URL;
import java.io.File;
import org.jfree.resourceloader.ResourceData;
import org.jfree.resourceloader.ResourceKey;
import org.jfree.resourceloader.ResourceKeyCreationException;
import org.jfree.resourceloader.ResourceLoader;
import org.jfree.resourceloader.ResourceLoadingException;
import org.jfree.resourceloader.ResourceManager;
import org.jfree.resourceloader.loader.LoaderUtils;
/**
* Creation-Date: 05.04.2006, 14:40:59
*
* @author Thomas Morgner
*/
public class ClassloaderResourceLoader implements ResourceLoader
{
private ResourceManager manager;
public ClassloaderResourceLoader()
{
}
public void setResourceManager(ResourceManager manager)
{
this.manager = manager;
}
/**
* Checks, whether this resource loader implementation was responsible for
* creating this key.
*
* @param key
* @return
*/
public boolean isSupportedKey(ResourceKey key)
{
if (ClassloaderResourceLoader.class.getName().equals(key.getSchema()))
{
return true;
}
return false;
}
/**
* Creates a new resource key from the given object and the factory keys.
*
* @param value
* @param factoryKeys
* @return the created key.
* @throws org.jfree.resourceloader.ResourceKeyCreationException
* if creating the key failed.
*/
public ResourceKey createKey(Object value, Map factoryKeys)
throws ResourceKeyCreationException
{
if (value instanceof String)
{
String valueString = (String) value;
if (valueString.startsWith("res://"))
{
return new ResourceKey(ClassloaderResourceLoader.class.getName(),
value, factoryKeys);
}
}
//throw new ResourceKeyCreationException("Unsupported identifier.");
return null;
}
/**
* Derives a new resource key from the given key. If neither a path nor new
* factory-keys are given, the parent key is returned.
*
* @param parent the parent
* @param path the derived path (can be null).
* @param factoryKeys the optional factory keys (can be null).
* @return the derived key.
* @throws org.jfree.resourceloader.ResourceKeyCreationException
* if the key cannot be derived for any reason.
*/
public ResourceKey deriveKey(ResourceKey parent, String path, Map factoryKeys)
throws ResourceKeyCreationException
{
if (isSupportedKey(parent) == false)
{
throw new ResourceKeyCreationException("Assertation: Unsupported parent key type");
}
final String resource;
if (path.startsWith("res://"))
{
resource = path;
}
else if (path.startsWith("/"))
{
resource = "res:/" + path;
}
else
{
resource = LoaderUtils.mergePaths((String) parent.getIdentifier(), path);
}
Map map;
if (factoryKeys != null)
{
map = new HashMap();
map.putAll(parent.getFactoryParameters());
map.putAll(factoryKeys);
}
else
{
map = parent.getFactoryParameters();
}
return new ResourceKey(parent.getSchema(), resource, map);
}
public URL toURL(ResourceKey key)
{
return null;
}
public ResourceManager getResourceManager()
{
return manager;
}
public ResourceData load(ResourceKey key) throws ResourceLoadingException
{
if (isSupportedKey(key) == false)
{
throw new ResourceLoadingException
("Key format is not recognized.");
}
return new ClassloaderResourceData(key);
}
/**
* A helper method to make it easier to create resource descriptions.
*
* @param c
* @param resource
* @return
*/
public static String createResourceKey (final Class c, final String resource)
{
if (c == null)
{
// the resource given should already be absolute ..
return "res://" + resource;
}
final String className = c.getName();
final int lastDot = className.lastIndexOf('.');
if (lastDot < 0)
{
return "res://" + resource;
}
else
{
final String packageName = className.substring(0, lastDot);
final String packagePath = packageName.replace('.', '/');
return "res://" + packageName + "/" + packagePath;
}
}
}