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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 lite.beans;

import java.util.Iterator;
import java.util.Map;
import java.util.Set;

class UtilMapPersistenceDelegate extends DefaultPersistenceDelegate {
    @Override
	@SuppressWarnings({ "unchecked", "nls" })
    protected void initialize(Class type, Object oldInstance,
			Object newInstance, Encoder enc) {
		// Call the initialization of the super type
		super.initialize(type, oldInstance, newInstance, enc);

		Map map = (Map) oldInstance;
		Set keySet = map.keySet();
		for (Iterator i = keySet.iterator(); i.hasNext();) {
			Object key = i.next();
			Expression getterExp = new Expression(oldInstance, "get",
					new Object[] { key});
			try {
				// Calculate the old value of the property
				Object oldVal = getterExp.getValue();
				// Write the getter expression to the encoder
				enc.writeExpression(getterExp);
				// Get the target value that exists in the new environment
				Object targetVal = enc.get(oldVal);
				// Get the current property value in the new environment
				Object newVal = null;
				try {
					newVal = new Expression(newInstance, "get", new Object[] { key }).getValue();
				} catch (ArrayIndexOutOfBoundsException ex) {
					// The newInstance has no elements, so current property
					// value remains null
				}
				/*
				 * Make the target value and current property value equivalent
				 * in the new environment
				 */
				if (null == targetVal) {
					if (null != newVal) {
						// Set to null
						Statement setterStm = new Statement(oldInstance, "put",
								new Object[] { key, null });
						enc.writeStatement(setterStm);
					}
				} else {
					PersistenceDelegate pd = enc
							.getPersistenceDelegate(targetVal.getClass());
					if (!pd.mutatesTo(targetVal, newVal)) {
						Statement setterStm = new Statement(oldInstance, "put",
								new Object[] { key, oldVal });
						enc.writeStatement(setterStm);
					}
				}
			} catch (Exception ex) {
				enc.getExceptionListener().exceptionThrown(ex);
			}
		}
	}
}