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From cos...@apache.org
Subject cvs commit: jakarta-ant/src/main/org/apache/tools/ant/taskdefs Classloader.java
Date Tue, 24 Dec 2002 01:27:45 GMT
costin      2002/12/23 17:27:45

  Added:       src/main/org/apache/tools/ant/taskdefs Classloader.java
  Log:
  Add the <classloader> task.
  
  It'll create a new loader or add paths to an existing loader.
  
  The main use is for the core loader - used to load ant regular
  and optional tasks.
  
  This is similar with embed, but 90% of the code is not needed for
  ant1.6 ( due to the delayed task creation ).
  
  For both import and classloader I changed the name of the class
  so embed can still compile.
  
  Revision  Changes    Path
  1.1                  jakarta-ant/src/main/org/apache/tools/ant/taskdefs/Classloader.java
  
  Index: Classloader.java
  ===================================================================
  /*
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2000-2002 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", "Ant", 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;
  
  import org.apache.tools.ant.*;
  import org.apache.tools.ant.types.*;
  
  import java.io.*;
  import java.util.*;
  import org.xml.sax.Locator;
  import org.xml.sax.InputSource;
  //import org.xml.sax.HandlerBase;
  import org.xml.sax.SAXParseException;
  import org.xml.sax.XMLReader;
  import org.xml.sax.SAXException;
  import org.xml.sax.DocumentHandler;
  import org.xml.sax.Attributes;
  import org.xml.sax.AttributeList;
  import org.xml.sax.helpers.XMLReaderAdapter;
  import org.xml.sax.helpers.DefaultHandler;
  import org.xml.sax.helpers.AttributeListImpl;
  
  import javax.xml.parsers.SAXParserFactory;
  import javax.xml.parsers.SAXParser;
  import javax.xml.parsers.ParserConfigurationException;
  
  /**
   * EXPERIMENTAL
   * Create or modifies ClassLoader. The required pathRef parameter
   * will be used to add classpath elements.
   *
   * The classpath is a regular path. Currently only file components are
   * supported ( future extensions may allow URLs ).
   *
   * You can modify the core loader by not specifying any name or using
   * "ant.coreLoader". ( the core loader is used to load system ant
   * tasks and for taskdefs that don't specify an explicit path ).
   *
   * Taskdef and typedef can use the loader you create if the name follows
   * the "ant.loader.NAME" pattern. NAME will be used as a pathref when
   * calling taskdef.
   *
   * This tasks will not modify the core loader if "build.sysclasspath=only"
   *
   * The typical use is:
   * <pre>
   *  &lt;path id="ant.deps" &gt;
   *     &lt;fileset dir="myDir" &gt;
   *        &lt;include name="junit.jar, bsf.jar, js.jar, etc"/&gt;
   *     &lt;/fileset&gt;
   *  &lt;/path&gt;
   *
   *  &lt;classloader pathRef="ant.deps" /&gt;
   *
   * </pre>
   *
   * @author Costin Manolache
   */
  public class Classloader extends Task {
      public static final String SYSTEM_LOADER_REF="ant.coreLoader";
  
      private String name=null;
      private Path path;
      private boolean reset=false;
      private boolean reverse=false;
      private String parentName=null;
  
      public Classloader() {
      }
  
      /** Name of the loader. If none, the default loader will be modified
       *
       * @param name
       */
      public void setName(String name) {
          this.name=name;
      }
  
      /** Reset the classloader, if it already exists. A new loader will
       * be created and all the references to the old one will be removed.
       * ( it is not possible to remove paths from a loader ). The new
       * path will be used.
       *
       * @param b
       */
      public void setReset(boolean b) {
          this.reset=b;
      }
  
      // TODO
      public void setReverse(boolean b ) {
          this.reverse=b;
      }
  
      // TODO: add exceptions for delegation or reverse
  
      // TODO
      public void setParentName( String name ) {
          this.parentName=name;
      }
  
  
      /** Specify which path will be used. If the loader already exists
       *  and is an AntClassLoader ( or any other loader we can extend ),
       *  the path will be added to the loader.
       */
      public void setPathRef( Reference pathRef ) throws BuildException {
          path=(Path)pathRef.getReferencedObject(project);
      }
  
  
      public void execute() {
          try {
              // Gump friendly - don't mess with the core loader if only classpath
              if( "only".equals( project.getProperty("build.sysclasspath")) &&
                      (name==null || SYSTEM_LOADER_REF.equals( name ))) {
                  log( "Changing the system loader is disabled " +
                          "by build.sysclasspath=only",
                          Project.MSG_WARN);
                  return;
              }
  
              String loaderName=(name==null) ? SYSTEM_LOADER_REF : name;
  
              Object obj=project.getReference(loaderName);
              if( reset ) {
                  // Are any other references held ? Can we 'close' the loader
                  // so it removes the locks on jars ?
                  obj=null; // a new one will be created.
              }
  
              // XXX maybe use reflection to addPathElement ( other patterns ?)
              if( obj!=null && !(obj instanceof AntClassLoader )) {
                  log( "Referenced object is not an AntClassLoader",
                          Project.MSG_ERR);
                  return;
              }
  
              AntClassLoader acl=(AntClassLoader)obj;
  
              if( acl==null ) {
                  // Construct a class loader
                  Object parent=null;
                  if( parentName != null ) {
                      parent=project.getReference(parentName);
                      if( !(parent instanceof ClassLoader) ) {
                          parent=null;
                      }
                  }
                  if( parent==null ) {
                      parent=this.getClass().getClassLoader();
                  }
  
                  acl=new AntClassLoader( (ClassLoader)parent,
                          project, path, reverse );
                  project.addReference( loaderName, acl );
                  if( name==null ) {
                      // This allows the core loader to load optional tasks
                      // without delegating
                      acl.addLoaderPackageRoot( "org.apache.tools.ant.taskdefs.optional");
                      project.setCoreLoader(acl);
                  }
              }
              if( path != null ) {
                  String list[]=path.list();
                  for( int i=0; i<list.length; i++ ) {
                      File f= new File( list[i] );
                      if( f.exists() ) {
                          acl.addPathElement(f.getAbsolutePath());
                          log("Adding to class loader " +  acl + " " + f.getAbsolutePath(),
                                  Project.MSG_DEBUG);
                      }
                  }
              }
  
              // XXX add exceptions
  
          } catch( Exception ex ) {
              ex.printStackTrace();
          }
      }
  }
  
  
  

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