001 /* 002 * Copyright 2005 Stephen McConnell 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 013 * implied. 014 * 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 019 package net.dpml.tools.tasks; 020 021 import net.dpml.library.Library; 022 import net.dpml.library.Resource; 023 import net.dpml.library.ResourceNotFoundException; 024 025 import net.dpml.tools.Context; 026 027 import org.apache.tools.ant.BuildException; 028 029 /** 030 * The plugin task handles the establishment of ant tasks, listeners, and antlibs derived 031 * from a classloader established by the tools sub-system. 032 * 033 * @author <a href="http://www.dpml.net">Digital Product Meta Library</a> 034 * @version 1.2.0 035 */ 036 public class PluginTask extends net.dpml.transit.tools.PluginTask 037 { 038 private String m_ref; 039 040 /** 041 * Set the ref address of a plugin resource. 042 * @param ref a resource ref 043 */ 044 public void setRef( String ref ) 045 { 046 m_ref = ref; 047 } 048 049 /** 050 * Task initialization. 051 */ 052 public void init() 053 { 054 super.init(); 055 Thread.currentThread().setContextClassLoader( getClass().getClassLoader() ); 056 } 057 058 /** 059 * Task execution. 060 */ 061 public void execute() 062 { 063 if( null != m_ref ) 064 { 065 Context context = (Context) getProject().getReference( "project.context" ); 066 if( null == context ) 067 { 068 final String error = 069 "Missing 'project.context' reference."; 070 throw new IllegalStateException( error ); 071 } 072 Library library = context.getLibrary(); 073 try 074 { 075 Resource resource = library.getResource( m_ref ); 076 String uri = resource.getArtifact( "plugin" ).toURI().toString(); 077 setUri( uri ); 078 } 079 catch( ResourceNotFoundException e ) 080 { 081 String message = e.getMessage(); 082 throw new BuildException( message, e, getLocation() ); 083 } 084 catch( Exception e ) 085 { 086 final String error = 087 "Unexpected error while attempting to initiaze plugin task uri."; 088 throw new BuildException( error, e ); 089 } 090 } 091 092 super.execute(); 093 } 094 }