cvs commit: jakarta-ant/proposal/myrmidon/src/java/org/apache/myrmidon/framework AbstractTypeDef.java

[do...@apache.org]

donaldp     01/06/08 02:06:42

  Added:       proposal/myrmidon/src/java/org/apache/myrmidon/framework
                        AbstractTypeDef.java
  Log:
  Abstract task to define types.
  
  Revision  Changes    Path
  1.1                  jakarta-ant/proposal/myrmidon/src/java/org/apache/myrmidon/framework/AbstractTypeDef.java
  
  Index: AbstractTypeDef.java
  ===================================================================
  /*
   * Copyright (C) The Apache Software Foundation. All rights reserved.
   *
   * This software is published under the terms of the Apache Software License
   * version 1.1, a copy of which has been included with this distribution in
   * the LICENSE file.
   */
  package org.apache.myrmidon.framework;
  
  import java.io.File;
  import java.net.URL;
  import java.net.URLClassLoader;
  import org.apache.avalon.framework.component.ComponentException;
  import org.apache.avalon.framework.component.ComponentManager;
  import org.apache.avalon.framework.component.Composable;
  import org.apache.myrmidon.api.AbstractTask;
  import org.apache.myrmidon.api.TaskException;
  import org.apache.myrmidon.components.deployer.RoleManager;
  import org.apache.myrmidon.components.type.DefaultTypeFactory;
  import org.apache.myrmidon.components.type.TypeException;
  import org.apache.myrmidon.components.type.TypeManager;
  
  /**
   * Abstract task to extend to define a type.
   *
   * TODO: Make this support classpath sub-element in future
   *
   * @author <a href="mailto:donaldp@apache.org">Peter Donald</a>
   */
  public abstract class AbstractTypeDef
      extends AbstractTask
      implements Composable
  {
      private String              m_lib;
      private String              m_name;
      private String              m_className;
      private TypeManager         m_typeManager;
      private RoleManager         m_roleManager;
  
      public void compose( final ComponentManager componentManager )
          throws ComponentException
      {
          m_typeManager = (TypeManager)componentManager.lookup( TypeManager.ROLE );
          m_roleManager = (RoleManager)componentManager.lookup( RoleManager.ROLE );
      }
  
      public void setLib( final String lib )
      {
          //In the future this would be replaced by ClassPath sub-element
          m_lib = lib;
      }
  
      public void setName( final String name )
      {
          m_name = name;
      }
  
      public void setClassname( final String className )
      {
          m_className = className;
      }
  
      public void execute()
          throws TaskException
      {
          if( null == m_name )
          {
              throw new TaskException( "Must specify name parameter" );
          }
          else if( null == m_className )
          {
              throw new TaskException( "Must specify classname parameter" );
          }
  
          final String typeName = getTypeName();
          final String role = m_roleManager.getRoleForName( typeName );
  
          final ClassLoader classLoader = createClassLoader();
          final DefaultTypeFactory factory = new DefaultTypeFactory( classLoader );
          factory.addNameClassMapping( m_name, m_className );
  
          try { m_typeManager.registerType( role, m_name, factory ); }
          catch( final TypeException te )
          {
              throw new TaskException( "Failed to register type", te );
          }
      }
  
      protected ClassLoader createClassLoader()
          throws TaskException
      {
          //TODO: Make this support classpath sub-element in future
  
          try
          {
              final File file = getContext().resolveFile( m_lib );
              final URL url = file.getCanonicalFile().toURL();
              final ClassLoader classLoader =
                  Thread.currentThread().getContextClassLoader();
  
              return new URLClassLoader( new URL[] { url }, classLoader );
          }
          catch( final Exception e )
          {
              throw new TaskException( "Failed to build classLoader due to: " + e, e );
          }
      }
  
      protected final TypeManager getTypeManager()
      {
          return m_typeManager;
      }
  
      protected abstract String getTypeName();
  }