// Copyright 2006, 2007, 2008, 2009 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.CollectionFactory;
import org.apache.tapestry5.ioc.internal.util.Defense;
import org.apache.tapestry5.ioc.services.ThreadLocale;
import org.apache.tapestry5.ioc.util.StrategyRegistry;
import org.apache.tapestry5.services.AssetFactory;
import org.apache.tapestry5.services.AssetSource;
import java.util.Locale;
import java.util.Map;
public class AssetSourceImpl implements AssetSource
{
private static final String CLASSPATH = "classpath";
private static final String CONTEXT = "context";
private final StrategyRegistry<AssetFactory> registry;
private final ThreadLocale threadLocale;
private final Map<String, Resource> prefixToRootResource = CollectionFactory.newMap();
private final Map<Resource, Asset> cache = CollectionFactory.newConcurrentMap();
public AssetSourceImpl(ThreadLocale threadLocale,
Map<String, AssetFactory> configuration)
{
this.threadLocale = threadLocale;
Map<Class, AssetFactory> byResourceClass = CollectionFactory.newMap();
for (Map.Entry<String, AssetFactory> e : configuration.entrySet())
{
String prefix = e.getKey();
AssetFactory factory = e.getValue();
Resource rootResource = factory.getRootResource();
byResourceClass.put(rootResource.getClass(), factory);
prefixToRootResource.put(prefix, rootResource);
}
registry = StrategyRegistry.newInstance(AssetFactory.class, byResourceClass);
}
public Asset getClasspathAsset(String path)
{
return getClasspathAsset(path, null);
}
public Asset getClasspathAsset(String path, Locale locale)
{
return getAsset(null, path, locale);
}
public Asset getContextAsset(String path, Locale locale)
{
return getAsset(prefixToRootResource.get(CONTEXT), path, locale);
}
public Asset getAsset(Resource baseResource, String path, Locale locale)
{
return getAssetInLocale(baseResource, path, defaulted(locale));
}
public Resource resourceForPath(String path)
{
return getUnlocalizedResource(null, path);
}
private Asset getAssetInLocale(Resource baseResource, String path, Locale locale)
{
return getLocalizedAssetFromResource(getUnlocalizedResource(baseResource, path), locale);
}
private Resource getUnlocalizedResource(Resource baseResource, String path)
{
Defense.notBlank(path, "path");
int colonx = path.indexOf(':');
if (colonx < 0)
{
Resource root = baseResource != null ? baseResource : prefixToRootResource.get(CLASSPATH);
return root.forFile(path);
}
String prefix = path.substring(0, colonx);
Resource root = prefixToRootResource.get(prefix);
if (root == null)
throw new IllegalArgumentException(ServicesMessages.unknownAssetPrefix(path));
return root.forFile(path.substring(colonx + 1));
}
private Asset getLocalizedAssetFromResource(Resource unlocalized, Locale locale)
{
Resource localized = locale == null
? unlocalized
: unlocalized.forLocale(locale);
if (localized == null)
throw new RuntimeException(ServicesMessages.assetDoesNotExist(unlocalized));
return getAssetForResource(localized);
}
private Asset getAssetForResource(Resource resource)
{
Asset result = cache.get(resource);
if (result == null)
{
result = createAssetFromResource(resource);
cache.put(resource, result);
}
return result;
}
private Locale defaulted(Locale locale)
{
return locale != null ? locale : threadLocale.getLocale();
}
private Asset createAssetFromResource(Resource resource)
{
// The class of the resource is derived from the class of the base resource.
// So we can then use the class of the resource as a key to locate the correct asset
// factory.
Class resourceClass = resource.getClass();
AssetFactory factory = registry.get(resourceClass);
return factory.createAsset(resource);
}
}