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'databene commons' is an open source Java library by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * Licensed 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 org.databene.commons.bean;

import java.util.Arrays;

import org.databene.commons.ArrayFormat;

/**
 * Wraps a plain object or an array and provides equals() and hashCode() 
 * that works consistently for both.
 * Created: 09.09.2010 09:53:11
 * @since 0.5.4
 * @author Volker Bergmann
 */
public class ObjectOrArray {

	private Object realObject;

	public ObjectOrArray(Object realObject) {
	    this.realObject = realObject;
    }

	@Override
	public int hashCode() {
		if (realObject.getClass().isArray())
			return Arrays.hashCode((Object[]) realObject);
		else
			return realObject.hashCode();
    }

	@Override
    public boolean equals(Object obj) {
	    if (this == obj)
		    return true;
	    if (obj == null || getClass() != obj.getClass())
		    return false;
	    ObjectOrArray that = (ObjectOrArray) obj;
	    if (this.realObject.getClass().isArray())
		    return Arrays.equals((Object[]) this.realObject, (Object[]) that.realObject);
	    else
	    	return this.realObject.equals(that.realObject);
    }
	
	@Override
	public String toString() {
		if (realObject.getClass().isArray())
			return ArrayFormat.format((Object[]) realObject);
		else
			return String.valueOf(realObject);
    }
	
}