// Copyright 2006, 2008, 2009, 2010, 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 java.io.IOException;
import java.util.Map;
import javax.servlet.http.HttpServletResponse;
import org.apache.tapestry5.SymbolConstants;
import org.apache.tapestry5.ioc.annotations.Symbol;
import org.apache.tapestry5.ioc.annotations.UsesMappedConfiguration;
import org.apache.tapestry5.services.ClasspathAssetAliasManager;
import org.apache.tapestry5.services.Dispatcher;
import org.apache.tapestry5.services.Request;
import org.apache.tapestry5.services.Response;
import org.apache.tapestry5.services.assets.AssetRequestHandler;
/**
* Recognizes requests where the path begins with "/asset/" and delivers the content therein as a bytestream. Also
* handles requests that are simply polling for a change to the file.
*
* @see ResourceStreamer
* @see ClasspathAssetAliasManager
* @see AssetRequestHandler
*/
@UsesMappedConfiguration(AssetRequestHandler.class)
public class AssetDispatcher implements Dispatcher
{
private final Map<String, AssetRequestHandler> configuration;
private final String pathPrefix;
public AssetDispatcher(Map<String, AssetRequestHandler> configuration,
@Symbol(SymbolConstants.APPLICATION_VERSION)
String applicationVersion)
{
this.configuration = configuration;
this.pathPrefix = RequestConstants.ASSET_PATH_PREFIX + applicationVersion + "/";
}
public boolean dispatch(Request request, Response response) throws IOException
{
String path = request.getPath();
// Remember that the request path does not include the context path, so we can simply start
// looking for the asset path prefix right off the bat.
if (!path.startsWith(pathPrefix))
return false;
String virtualPath = path.substring(pathPrefix.length());
int slashx = virtualPath.indexOf('/');
String virtualFolder = virtualPath.substring(0, slashx);
AssetRequestHandler handler = configuration.get(virtualFolder);
if (handler != null)
{
String extraPath = virtualPath.substring(slashx + 1);
boolean handled = handler.handleAssetRequest(request, response, extraPath);
if (handled)
return true;
}
response.sendError(HttpServletResponse.SC_NOT_FOUND, path);
return true;
}
}