/**
* ================================================
* 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: URLResourceLoader.java,v 1.3 2007/04/01 13:43:17 taqua Exp $
* ------------
* (C) Copyright 2006, by Pentaho Corporation.
*/
package org.jfree.resourceloader.loader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
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;
/**
* Creation-Date: 05.04.2006, 15:32:36
*
* @author Thomas Morgner
*/
public class URLResourceLoader implements ResourceLoader
{
private ResourceManager manager;
public URLResourceLoader()
{
}
public void setResourceManager(ResourceManager manager)
{
this.manager = manager;
}
public ResourceManager getResourceManager()
{
return manager;
}
/**
* Checks, whether this resource loader implementation was responsible for
* creating this key.
*
* @param key
* @return
*/
public boolean isSupportedKey(ResourceKey key)
{
if (URLResourceLoader.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 URL)
{
return new ResourceKey
(URLResourceLoader.class.getName(), value, factoryKeys);
}
if (value instanceof String)
{
String valueString = (String) value;
// the 'file' schema is defined to have double-slashes, but the JDK
// ignores RFC 1738 in that case. So we have to check for these beasts
// directly ..
if (valueString.indexOf("://") >= 0 ||
valueString.startsWith("file:/"))
{
try
{
return new ResourceKey(URLResourceLoader.class.getName(),
new URL(valueString), factoryKeys);
}
catch (MalformedURLException mfue)
{
// we dont take this easy!
throw new ResourceKeyCreationException("Malformed value: " + value);
}
}
}
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");
}
try
{
URL url;
if (path != null)
{
url = new URL((URL) parent.getIdentifier(), path);
}
else
{
url = (URL) parent.getIdentifier();
}
Map map;
if (factoryKeys != null)
{
map = new HashMap();
map.putAll(parent.getFactoryParameters());
map.putAll(factoryKeys);
}
else
{
map = parent.getFactoryParameters();
}
return new ResourceKey(parent.getSchema(), url, map);
}
catch (MalformedURLException e)
{
throw new ResourceKeyCreationException("Malformed value: " + path);
}
}
public URL toURL(ResourceKey key)
{
return (URL) key.getIdentifier();
}
public ResourceData load(ResourceKey key) throws ResourceLoadingException
{
if (isSupportedKey(key) == false)
{
throw new ResourceLoadingException
("Key format is not recognized.");
}
return new URLResourceData(key);
}
}