// Copyright 2006, 2007, 2008, 2009, 2011 The Apache Software Foundation
//
// 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 org.apache.tapestry5.internal.services;
import org.apache.tapestry5.Asset;
import org.apache.tapestry5.ioc.Resource;
import org.apache.tapestry5.ioc.internal.util.ClasspathResource;
import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
import org.apache.tapestry5.services.AssetFactory;
import org.apache.tapestry5.services.AssetPathConverter;
import org.apache.tapestry5.services.ClasspathAssetAliasManager;
import org.apache.tapestry5.services.InvalidationListener;
import java.util.Map;
/**
* Generates Assets for files on the classpath. Caches generated client URLs internally, and clears that cache when
* notified to do so by the {@link ResourceDigestManager}.
*
* @see AssetDispatcher
*/
public class ClasspathAssetFactory implements AssetFactory, InvalidationListener
{
private final ResourceDigestManager digestManager;
private final ClasspathAssetAliasManager aliasManager;
private final Map<Resource, String> resourceToDefaultPath = CollectionFactory.newConcurrentMap();
private final ClasspathResource rootResource;
private final AssetPathConverter converter;
private final boolean invariant;
public ClasspathAssetFactory(ResourceDigestManager digestManager, ClasspathAssetAliasManager aliasManager,
AssetPathConverter converter)
{
this.digestManager = digestManager;
this.aliasManager = aliasManager;
this.converter = converter;
rootResource = new ClasspathResource("");
invariant = converter.isInvariant();
}
public void objectWasInvalidated()
{
resourceToDefaultPath.clear();
}
private String clientURL(Resource resource)
{
String defaultPath = resourceToDefaultPath.get(resource);
if (defaultPath == null)
{
defaultPath = buildDefaultPath(resource);
resourceToDefaultPath.put(resource, defaultPath);
}
return converter.convertAssetPath(defaultPath);
}
private String buildDefaultPath(Resource resource)
{
boolean requiresDigest = digestManager.requiresDigest(resource);
String path = resource.getPath();
if (requiresDigest)
{
// Resources with extensions go from foo/bar/baz.txt --> foo/bar/baz.CHECKSUM.txt
int lastdotx = path.lastIndexOf('.');
path = path.substring(0, lastdotx + 1) + digestManager.getDigest(resource) + path.substring(lastdotx);
}
return aliasManager.toClientURL(path);
}
public Asset createAsset(final Resource resource)
{
return new AbstractAsset(invariant)
{
public Resource getResource()
{
return resource;
}
public String toClientURL()
{
return clientURL(resource);
}
};
}
public Resource getRootResource()
{
return rootResource;
}
}