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.


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@269119 13f79535-47bb-0310-9956-ffa450edef68

proposal/myrmidon/src/java/org/apache/myrmidon/framework/TypeInstanceTask.java

@@ -0,0 +1,118 @@
+/*
+ * 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 );
+        }
+    }
+}