/*
 *  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 com.googlecode.openbeans.Encoder;
import com.googlecode.openbeans.Expression;
import com.googlecode.openbeans.PersistenceDelegate;


/**
 * A special internal <code>PersistenceDelegate</code> for wrapper classes of
 * primitive types like int.
 * 
 */
class PrimitiveWrapperPersistenceDelegate extends PersistenceDelegate {

    /*
     * It's unnecessary to do anything for initialization, because two mutatable
     * wrapper objects are actually equivalent already.
     */
    @Override
    protected void initialize(Class<?> type, Object oldInstance,
            Object newInstance, Encoder enc) {
        // do nothing
    }

    /*
     * Instantiates a wrapper object using the constructor taking one String
     * parameter except for Character.
     */
    @Override
    protected Expression instantiate(Object oldInstance, Encoder enc) {
        if (oldInstance instanceof Character) {
            return new Expression(oldInstance, oldInstance.toString(),
                    "charAt", new Object[] { Integer.valueOf(0) }); //$NON-NLS-1$
        }
        return new Expression(oldInstance, oldInstance.getClass(),
                "new", new Object[] { oldInstance //$NON-NLS-1$
                        .toString() });
    }

    /*
     * Two wrapper objects are regarded mutatable if they are equal.
     */
    @Override
    protected boolean mutatesTo(Object o1, Object o2) {
        if (null == o2) {
            return false;
        }
        return o1.equals(o2);
    }

}