| // Copyright 2004 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.tapestry.asset; |
| |
| import java.io.InputStream; |
| import java.net.URL; |
| |
| import org.apache.tapestry.ApplicationRuntimeException; |
| import org.apache.tapestry.IAsset; |
| import org.apache.tapestry.IEngine; |
| import org.apache.tapestry.ILocation; |
| import org.apache.tapestry.IRequestCycle; |
| import org.apache.tapestry.Tapestry; |
| import org.apache.tapestry.resource.ContextResourceLocation; |
| |
| /** |
| * An asset whose path is relative to the {@link javax.servlet.ServletContext} containing |
| * the application. |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| **/ |
| |
| public class ContextAsset extends AbstractAsset implements IAsset |
| { |
| private String _resolvedURL; |
| |
| public ContextAsset(ContextResourceLocation resourceLocation, ILocation location) |
| { |
| super(resourceLocation, location); |
| } |
| |
| /** |
| * Generates a URL for the client to retrieve the asset. The context path |
| * is prepended to the asset path, which means that assets deployed inside |
| * web applications will still work (if things are configured properly). |
| * |
| **/ |
| |
| public String buildURL(IRequestCycle cycle) |
| { |
| if (_resolvedURL == null) |
| { |
| IEngine engine = cycle.getEngine(); |
| String contextPath = engine.getContextPath(); |
| |
| _resolvedURL = contextPath + getResourceLocation().getPath(); |
| } |
| |
| return _resolvedURL; |
| } |
| |
| public InputStream getResourceAsStream(IRequestCycle cycle) |
| { |
| try |
| { |
| URL url = getResourceLocation().getResourceURL(); |
| |
| return url.openStream(); |
| } |
| catch (Exception ex) |
| { |
| throw new ApplicationRuntimeException( |
| Tapestry.format("ContextAsset.resource-missing", getResourceLocation()), |
| ex); |
| } |
| } |
| } |