NullTemplateHelper.java

/***************************************************************************
   Copyright 2008 Emily Estes

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
***************************************************************************/
package net.metanotion.simpletemplate;


import net.metanotion.scripting.ObjectServer;
import net.metanotion.web.RequestObject;

/** This is a convenience object that implements a ResourceFactory that always throws an exception and a Resource
that always throws an exception if you try to evaluate it.
*/
public final class NullTemplateHelper implements Resource, ResourceFactory {
	/** Since this class is stateless, this contains a convenience instance to use. */
	public static final NullTemplateHelper INSTANCE = new NullTemplateHelper();
	// ResourceFactory
	@Override public Resource get(String urn) { throw new RuntimeException("Resource '" + urn + "' could not be found."); }
	// Resource
	@Override public Object skin(ObjectServer os, RequestObject ro) { throw new RuntimeException("Bad Resource"); }
}