001 // Copyright 2004, 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // You may obtain a copy of the License at 006 // 007 // http://www.apache.org/licenses/LICENSE-2.0 008 // 009 // Unless required by applicable law or agreed to in writing, software 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.tapestry.asset; 016 017 import java.io.InputStream; 018 import java.net.URL; 019 020 import org.apache.hivemind.ApplicationRuntimeException; 021 import org.apache.hivemind.Location; 022 import org.apache.tapestry.IRequestCycle; 023 import org.apache.tapestry.Tapestry; 024 025 /** 026 * A reference to an external URL. {@link ExternalAsset}s are not 027 * localizable. 028 * 029 * @author Howard Lewis Ship 030 * 031 **/ 032 033 public class ExternalAsset extends AbstractAsset 034 { 035 private String _URL; 036 037 public ExternalAsset(String URL, Location location) 038 { 039 super(null, location); 040 041 _URL = URL; 042 } 043 044 /** 045 * Simply returns the URL of the external asset. 046 * 047 **/ 048 049 public String buildURL(IRequestCycle cycle) 050 { 051 return _URL; 052 } 053 054 public InputStream getResourceAsStream(IRequestCycle cycle) 055 { 056 URL url; 057 058 try 059 { 060 url = new URL(_URL); 061 062 return url.openStream(); 063 } 064 catch (Exception ex) 065 { 066 // MalrformedURLException or IOException 067 068 throw new ApplicationRuntimeException(Tapestry.format("ExternalAsset.resource-missing", _URL), ex); 069 } 070 071 } 072 073 public String toString() 074 { 075 return "ExternalAsset[" + _URL + "]"; 076 } 077 }