org.apache.beehive.controls.runtime.bean.AdaptorPersistenceDelegate Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* $Header:$
*/
package org.apache.beehive.controls.runtime.bean;
import java.beans.DefaultPersistenceDelegate;
import java.beans.Encoder;
import java.beans.Expression;
/**
* The AdaptorPersistenceDelegate class supports the XML persistance of Control Client Event
* Adaptor instances by implementing the java.beans.PersistenceDelegate API, and
* overriding the default persistance algorithm based upon the runtime structure for Controls.
*/
public class AdaptorPersistenceDelegate extends DefaultPersistenceDelegate
{
/**
* PersistenceDelegate.instantiate()
*/
protected Expression instantiate(Object oldInstance, Encoder out)
{
if (! (oldInstance instanceof EventAdaptor))
return super.instantiate(oldInstance, out);
//
// An implementation instance is actually constructed at decode time by calling
// ControlBean.ensureControl on the parent bean. This will create a new impl
// instance and run the impl initializer on it.
//
return new Expression(oldInstance, oldInstance.getClass(), "new",
new Object[] { ((EventAdaptor)oldInstance).getClient() });
}
/**
* PersistenceDelegate.initialize()
*/
protected void initialize(Class type, Object oldInstance, Object newInstance, Encoder out)
{
super.initialize(type, oldInstance, newInstance, out);
}
/**
* PersistenceDelegate.writeObject()
*/
public void writeObject(Object oldInstance, Encoder out)
{
super.writeObject(oldInstance, out);
}
}