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App55 client library for the Java platform.

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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.
 */

package com.googlecode.openbeans;

import java.lang.reflect.Method;

/**
 * Persistence delegate for {@link java.lang.reflect.Method} class.
 */
class MethodPersistenceDelegate extends PersistenceDelegate
{
	@Override
	protected Expression instantiate(Object oldInstance, Encoder out)
	{
		// should not be null or have a type other than Method
		assert oldInstance instanceof Method : oldInstance;
		Method oldMethod = (Method) oldInstance;
		Class declClass = oldMethod.getDeclaringClass();
		return new Expression(oldMethod, declClass, "getMethod", //$NON-NLS-1$
				new Object[] { oldMethod.getName(), oldMethod.getParameterTypes() });
	}

	@Override
	protected void initialize(Class type, Object oldInstance, Object newInstance, Encoder out)
	{
		// check for consistency
		assert oldInstance instanceof Method : oldInstance;
		assert newInstance instanceof Method : newInstance;
		assert newInstance.equals(oldInstance);
	}

	@Override
	protected boolean mutatesTo(Object oldInstance, Object newInstance)
	{
		assert oldInstance instanceof Method : oldInstance;
		if (!(newInstance instanceof Method))
		{
			// if null or not a Method
			return false;
		}
		return oldInstance.equals(newInstance);
	}
}