donaldp 02/03/13 01:36:52
Modified: proposal/myrmidon/src/java/org/apache/myrmidon/framework
Resources.properties
Added: proposal/myrmidon/src/java/org/apache/myrmidon/framework
AbstractFacadeTask.java
Log:
Add a first cut of an abstractFacade task. This is supposed to be the base
class of the Jspc, Javac, Rmic and similar facade tasks
Revision Changes Path
1.8 +2 -0
jakarta-ant/proposal/myrmidon/src/java/org/apache/myrmidon/framework/Resources.properties
Index: Resources.properties
===================================================================
RCS file:
/home/cvs/jakarta-ant/proposal/myrmidon/src/java/org/apache/myrmidon/framework/Resources.properties,v
retrieving revision 1.7
retrieving revision 1.8
diff -u -r1.7 -r1.8
--- Resources.properties 3 Mar 2002 02:19:11 -0000 1.7
+++ Resources.properties 13 Mar 2002 09:36:52 -0000 1.8
@@ -14,3 +14,5 @@
type.no-id.error=Id must be specified.
unknown-family=Don't know how to detect os family "{0}"
+
+facade.missing-impl.error=Unable to determine the name of implementation for
facade task "{0}".
\ No newline at end of file
1.1
jakarta-ant/proposal/myrmidon/src/java/org/apache/myrmidon/framework/AbstractFacadeTask.java
Index: AbstractFacadeTask.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.txt file.
*/
package org.apache.myrmidon.framework;
import org.apache.avalon.excalibur.i18n.ResourceManager;
import org.apache.avalon.excalibur.i18n.Resources;
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.TaskException;
/**
* Abstract task used to write tasks that delegate to facades
* such as Javac, Jspc and so forth.
*
* @author <a href="mailto:[EMAIL PROTECTED]">Peter Donald</a>
* @version $Revision: 1.1 $ $Date: 2002/03/13 09:36:52 $
*/
public abstract class AbstractFacadeTask
extends AbstractContainerTask
implements Configurable
{
private final static Resources REZ =
ResourceManager.getPackageResources( AbstractFacadeTask.class );
/**
* The name of the attribute used to select specific
* implementation of facade.
*/
private final String m_selector;
/**
* The Class type for the facade (also used as the role
* when looking up TypeManager).
*/
private final Class m_facadeType;
/**
* The default name of implementation if none are specified.
*/
private final String m_defaultName;
/**
* The configuration used to configure the facade implementation.
*/
private Configuration m_configuration;
/**
* Create the facade task that works with specified facade class,
* using the selector attribute to find implementation or using
* defaultName if selector attribute not specified.
*/
protected AbstractFacadeTask( final String selector,
final Class facadeType,
final String defaultName )
{
m_selector = selector;
m_facadeType = facadeType;
m_defaultName = defaultName;
}
/**
* Supply the configuration for this task.
*/
public void configure( final Configuration configuration )
throws ConfigurationException
{
m_configuration = configuration;
}
/**
* Utility method to create and configure the facade
* implementation.
*/
protected Object prepareFacade()
throws TaskException
{
final Object facade = createFacade();
configureFacade( facade );
return facade;
}
/**
* Utility method to configure the specified facade.
* It will be configured according to normal resolution
* rules using the configuration data supplied to task
* minus the selector attribute if present.
*/
protected void configureFacade( final Object facade )
throws TaskException
{
Configuration configuration = m_configuration;
if( null != m_selector &&
null != m_configuration.getAttribute( m_selector, null ) )
{
configuration = rebuildConfiguration( m_configuration, m_selector
);
}
try
{
configureElement( facade, m_facadeType, configuration );
}
catch( final ConfigurationException ce )
{
throw new TaskException( ce.getMessage(), ce );
}
}
/**
* Rebuild the configuration tree with the attribute with specified
* name removed from top-level element.
*/
private Configuration rebuildConfiguration( final Configuration
configuration,
final String attribute )
{
final DefaultConfiguration newConfiguration =
new DefaultConfiguration( configuration.getName(),
configuration.getLocation() );
//Add all the attributes from old configuration except the one
//that was used to select the particular implementation
final String[] names = configuration.getAttributeNames();
for( int i = 0; i < names.length; i++ )
{
final String name = names[ i ];
if( !name.equals( attribute ) )
{
final String value = configuration.getAttribute( name, null );
newConfiguration.setAttribute( name, value );
}
}
//Add all elements to new configuration element in the
//correct order
final Configuration[] children = configuration.getChildren();
for( int i = 0; i < children.length; i++ )
{
newConfiguration.addChild( children[ i ] );
}
return newConfiguration;
}
/**
* Create the instance of the facade. It looks up the name
* of the implementation via the <code>getImplementation()</code>
* method and then creates a new instance from a TypeFactory
* using that name and the facadeType (specified in the
* constructor).
*/
protected Object createFacade()
throws TaskException
{
final String implementation = getImplementation();
if( null == implementation )
{
final String message =
REZ.getString( "facade.missing-impl.error",
getContext().getName() );
throw new TaskException( message );
}
return newInstance( m_facadeType, implementation );
}
/**
* Get the shortname of the implementation
* to use. It assumes that the implementation is registered in
* the TypeFactory under this shortname.
*/
protected String getImplementation()
{
if( null != m_selector )
{
return m_configuration.getAttribute( m_selector, m_defaultName );
}
else
{
return m_defaultName;
}
}
}
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