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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.Field;
import java.util.HashMap;

class StaticFieldPersistenceDelegate extends PersistenceDelegate
{

	public StaticFieldPersistenceDelegate()
	{
		super();
	}

	static HashMap	pairs	= new HashMap();

	static void init(Class clz)
	{
		Field[] field = clz.getFields();
		for (int i = 0; i < field.length; i++)
		{
			Object value = null;
			try
			{
				value = field[i].get(clz);
			}
			catch (Exception e)
			{
				return;
			}
			if (value.getClass() == clz)
			{
				pairs.put(value, field[i].getName());
			}
		}
	}

	@Override
	protected Expression instantiate(Object oldInstance, Encoder enc)
	{
		Field field = null;
		try
		{
			field = oldInstance.getClass().getDeclaredField(pairs.get(oldInstance));
		}
		catch (Exception e)
		{
			enc.getExceptionListener().exceptionThrown(e);
		}
		return new Expression(oldInstance, field, "get", //$NON-NLS-1$
				new Object[] { oldInstance.getClass() });
	}

}