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

[do...@apache.org]

donaldp     01/06/08 02:05:58

  Added:       proposal/myrmidon/src/java/org/apache/myrmidon/framework
                        TypeInstanceTask.java
  Log:
  Added first sweep at TypeInstanceTask
  
  This will allow easy definition of types like
  
  <pattern id="foo" ... >
    ...
  </pattern>
  
  Allos simple definition of DataTypes and simple use in buildfiles aswell.
  
  Revision  Changes    Path
  1.1                  jakarta-ant/proposal/myrmidon/src/java/org/apache/myrmidon/framework/TypeInstanceTask.java
  
  Index: TypeInstanceTask.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 org.apache.avalon.framework.component.ComponentException;
  import org.apache.avalon.framework.component.ComponentManager;
  import org.apache.avalon.framework.component.Composable;
  import org.apache.avalon.framework.configuration.Configurable;
  import org.apache.avalon.framework.configuration.Configuration;
  import org.apache.avalon.framework.configuration.ConfigurationException;
  import org.apache.avalon.framework.configuration.DefaultConfiguration;
  import org.apache.myrmidon.api.DataType;
  import org.apache.myrmidon.api.TaskContext;
  import org.apache.myrmidon.api.TaskException;
  import org.apache.myrmidon.components.type.TypeException;
  import org.apache.myrmidon.components.type.TypeFactory;
  import org.apache.myrmidon.components.type.TypeManager;
  
  /**
   * This is the property "task" to declare a binding of a datatype to a name.
   *
   * @author <a href="mailto:donaldp@apache.org">Peter Donald</a>
   */
  public class TypeInstanceTask
      extends AbstractContainerTask
      implements Configurable
  {
      private String              m_id;
      private Object              m_value;
      private boolean             m_localScope     = true;
      private TypeFactory         m_factory;
  
      public void compose( final ComponentManager componentManager )
          throws ComponentException
      {
          super.compose( componentManager );
  
          final TypeManager typeManager = (TypeManager)componentManager.lookup( TypeManager.ROLE );
          try { m_factory = typeManager.getFactory( DataType.ROLE ); }
          catch( final TypeException te )
          {
              throw new ComponentException( "Unable to retrieve factory from TypeManager", te );
          }
      }
  
      public void configure( final Configuration configuration )
          throws ConfigurationException
      {
          final DefaultConfiguration newConfiguration =
              new DefaultConfiguration( configuration.getName(), configuration.getLocation() );
  
          final String[] attributes = configuration.getAttributeNames();
          for( int i = 0; i < attributes.length; i++ )
          {
              final String name = attributes[ i ];
              final String value = configuration.getAttribute( name );
  
              if( name.equals( "id" ) || name.equals( "local-scope" ) )
              {
                  configure( this, name, value );
              }
              else
              {
                  newConfiguration.setAttribute( name, value );
              }
          }
  
          final Configuration[] children = configuration.getChildren();
          for( int i = 0; i < children.length; i++ )
          {
              newConfiguration.addChild( children[ i ] );
          }
  
          try
          {
              m_value = m_factory.create( configuration.getName() );
          }
          catch( final Exception e )
          {
              throw new ConfigurationException( "Unable to create datatype", e );
          }
  
          configure( m_value, newConfiguration );
      }
  
      public void setId( final String id )
      {
          m_id = id;
      }
  
      public void setLocalScope( final boolean localScope )
      {
          m_localScope = localScope;
      }
  
      public void execute()
          throws TaskException
      {
          if( null == m_id )
          {
              throw new TaskException( "Id must be specified" );
          }
  
          if( m_localScope )
          {
              getContext().setProperty( m_id, m_value );
          }
          else
          {
              getContext().setProperty( m_id, m_value, TaskContext.PARENT );
          }
      }
  }