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.hivemind.util; 016 017 import java.io.IOException; 018 import java.io.InputStream; 019 import java.net.MalformedURLException; 020 import java.net.URL; 021 import java.util.Locale; 022 023 import org.apache.hivemind.ApplicationRuntimeException; 024 import org.apache.hivemind.Resource; 025 026 /** 027 * An implementation of {@link org.apache.hivemind.Resource} 028 * built around a string representation of a URL. 029 * 030 * @author Howard Lewis Ship 031 */ 032 public class URLResource extends AbstractResource 033 { 034 private URL _url; 035 036 public URLResource( URL url ) 037 { 038 super( url.toString() ); 039 _url = url; 040 } 041 042 public URLResource( String path ) 043 { 044 super( path ); 045 } 046 047 public String toString() 048 { 049 return getPath(); 050 } 051 052 protected Resource newResource( String path ) 053 { 054 return new URLResource( path ); 055 } 056 057 public URL getResourceURL() 058 { 059 if( _url == null ) 060 { 061 try 062 { 063 URL test = new URL( getPath() ); 064 InputStream stream = test.openStream(); 065 if( stream != null ) 066 { 067 stream.close(); 068 _url = test; 069 } 070 } 071 catch( MalformedURLException ex ) 072 { 073 throw new ApplicationRuntimeException( ex ); 074 } 075 catch( IOException ex ) 076 { 077 // If the resource can't be opened, 078 // then return null. 079 } 080 } 081 return _url; 082 } 083 084 /** 085 * Always returns this location; no localization check occurs. 086 */ 087 public Resource getLocalization( Locale locale ) 088 { 089 return this; 090 } 091 }