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From cos...@apache.org
Subject cvs commit: jakarta-ant/proposal/embed/src/java/org/apache/tools/ant/taskdefs/optional TaskDiscovery.java
Date Fri, 11 Oct 2002 18:19:33 GMT
costin      2002/10/11 11:19:33

  Added:       proposal/embed/src/java/org/apache/tools/ant/taskdefs/optional
                        TaskDiscovery.java
  Removed:     proposal/embed/src/java/org/apache/tools/ant/taskdefs
                        ServiceDiscoveryTask.java
  Log:
  Removed ServiceDiscoveryTask ( for now ).
  
  Added an experimental TaskDiscovery that will use commons-discovery
  to find tasks using the ProjectComponentFactory hook.
  This is just to play with different antlib mechanisms.
  
  Revision  Changes    Path
  1.1                  jakarta-ant/proposal/embed/src/java/org/apache/tools/ant/taskdefs/optional/TaskDiscovery.java
  
  Index: TaskDiscovery.java
  ===================================================================
  /*
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 1999-2002 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowlegement:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "Commons", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Group.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.tools.ant.taskdefs.optional;
  import org.apache.tools.ant.*;
  
  import java.util.*;
  
  import org.apache.commons.discovery.ResourceName;
  import org.apache.commons.discovery.ResourceNameIterator;
  import org.apache.commons.discovery.jdk.JDKHooks;
  import org.apache.commons.discovery.resource.DiscoverResources;
  
  
  /**
   * Default implementation for discovery and (lazy) creation of tasks.
   *
   * Several mechanisms will be used:
   * - properties files found in the classpath ( META-INF/ant.tasks ).
   * - resources named after the task name: META-INF/ant/[TASK_NAME].task
   *
   * @author Costin Manolache
   */
  public class TaskDiscovery extends Task implements ProjectComponentFactory
  {
      String RESOURCE_NAME="META-INF/ant.tasks";
  
      // Also discovery the 'legacy' names - in ant1.6 the initial preloaded tasks
      // should be deprecated.
      
      ResourceName[] discoveredTasks = null;
  
      Hashtable taskDefs=new Hashtable();
  
      public Object createProjectComponent( Project project,
                                            String ns,
                                            String taskName )
          throws BuildException
      {
          //        System.out.println("Try create " + taskName);
          // 
          return null;
      }
  
      public String toString() {
          StringBuffer sb=new StringBuffer();
          sb.append( "DiscoveredTasks[" );
          if( discoveredTasks != null ) {
              for( int i=0; i<discoveredTasks.length; i++ ) {
                  if( i>0) sb.append( ", ");
                  sb.append( discoveredTasks[i] );
              }
              sb.append( "]");
          }
          return sb.toString();
      }
  
  
      Properties taskClassNames=new Properties();
  
      /** @TODO: Register itself as ProjectComponentHelper.
       */
      public void execute() throws BuildException
      {
          ProjectComponentHelper pcHelper=ProjectComponentHelper.getProjectComponentHelper();
          pcHelper.addComponentFactory( this );
          
          // We'll read all 'ant.tasks' at startup, and every time an unknown task
          // is found ( the classloader may be different from last time ). Not the best
          // solution, just a start.
          DiscoverResources disc = new DiscoverResources();
          disc.addClassLoader( JDKHooks.getJDKHooks().getThreadContextClassLoader() );
          disc.addClassLoader( this.getClass().getClassLoader() );
          
          ResourceNameIterator enum = disc.findResources(RESOURCE_NAME);
          
          Vector vector = new Vector();
          while (enum.hasNext()) {
              ResourceName resourceInfo = enum.nextResourceName();
              vector.add(resourceInfo);
              System.out.println("Found " + resourceInfo);
  
              
          }
          
          discoveredTasks = new ResourceName[vector.size()];
          vector.copyInto(discoveredTasks);
      }
          
  }
  
  
  

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