/**
* Copyright 2005-2014 Restlet
*
* The contents of this file are subject to the terms of one of the following
* open source licenses: Apache 2.0 or or EPL 1.0 (the "Licenses"). You can
* select the license that you prefer but you may not use this file except in
* compliance with one of these Licenses.
*
* You can obtain a copy of the Apache 2.0 license at
* http://www.opensource.org/licenses/apache-2.0
*
* You can obtain a copy of the EPL 1.0 license at
* http://www.opensource.org/licenses/eclipse-1.0
*
* See the Licenses for the specific language governing permissions and
* limitations under the Licenses.
*
* Alternatively, you can obtain a royalty free commercial license with less
* limitations, transferable or non-transferable, directly at
* http://restlet.com/products/restlet-framework
*
* Restlet is a registered trademark of Restlet S.A.S.
*/
package org.restlet.ext.velocity;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.commons.collections.ExtendedProperties;
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.velocity.runtime.resource.Resource;
import org.apache.velocity.runtime.resource.loader.ResourceLoader;
import org.restlet.representation.Representation;
/**
* Velocity resource loader based on a static map of representations or on a
* default representation.
*
* @author Jerome Louvel
*/
public class RepresentationResourceLoader extends ResourceLoader {
/** The cache of template representations. */
private static final Map<String, Representation> store = new ConcurrentHashMap<String, Representation>();
/**
* Returns the cache of template representations.
*
* @return The cache of template representations.
*/
public static Map<String, Representation> getStore() {
return store;
}
/** The default representation to load. */
private final Representation defaultRepresentation;
/**
* Constructor.
*
* @param defaultRepresentation
* The default representation to use.
*/
public RepresentationResourceLoader(Representation defaultRepresentation) {
this.defaultRepresentation = defaultRepresentation;
}
@Override
public long getLastModified(Resource resource) {
final Representation original = getStore().get(resource.getName());
return (original != null) ? original.getModificationDate().getTime()
: 0;
}
@Override
public InputStream getResourceStream(String name)
throws ResourceNotFoundException {
InputStream result = null;
try {
Representation resultRepresentation = getStore().get(name);
if (resultRepresentation == null) {
resultRepresentation = this.defaultRepresentation;
if (resultRepresentation == null) {
throw new ResourceNotFoundException(
"Could not locate resource '" + name + "'");
}
result = resultRepresentation.getStream();
} else {
result = resultRepresentation.getStream();
}
} catch (IOException ioe) {
throw new ResourceNotFoundException(ioe);
}
return result;
}
@Override
public void init(ExtendedProperties configuration) {
}
@Override
public boolean isSourceModified(Resource resource) {
return getLastModified(resource) != resource.getLastModified();
}
}