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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 org.apache.commons.lang3.mutable;
import java.io.Serializable;
/**
* A mutable <code>Object</code> wrapper.
*
* @since 2.1
* @author Apache Software Foundation
* @version $Id$
*/
public class MutableObject<T> implements Mutable<T>, Serializable {
/**
* Required for serialization support.
*
* @see java.io.Serializable
*/
private static final long serialVersionUID = 86241875189L;
/** The mutable value. */
private T value;
/**
* Constructs a new MutableObject with the default value of <code>null</code>.
*/
public MutableObject() {
super();
}
/**
* Constructs a new MutableObject with the specified value.
*
* @param value the initial value to store
*/
public MutableObject(T value) {
super();
this.value = value;
}
//-----------------------------------------------------------------------
/**
* Gets the value.
*
* @return the value, may be null
*/
public T getValue() {
return this.value;
}
/**
* Sets the value.
*
* @param value the value to set
*/
public void setValue(T value) {
this.value = value;
}
//-----------------------------------------------------------------------
/**
* <p>
* Compares this object against the specified object. The result is <code>true</code> if and only if the argument
* is not <code>null</code> and is a <code>MutableObject</code> object that contains the same <code>T</code>
* value as this object.
* </p>
*
* @param obj the object to compare with, <code>null</code> returns <code>false</code>
* @return <code>true</code> if the objects are the same;
* <code>true</code> if the objects have equivalent <code>value</code> fields;
* <code>false</code> otherwise.
*/
@SuppressWarnings("unchecked")
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (this == obj) {
return true;
}
if (this.getClass() == obj.getClass()) {
MutableObject<T> that = (MutableObject<T>) obj;
return this.value.equals(that.value);
}
else {
return false;
}
}
/**
* Returns the value's hash code or <code>0</code> if the value is <code>null</code>.
*
* @return the value's hash code or <code>0</code> if the value is <code>null</code>.
*/
@Override
public int hashCode() {
return value == null ? 0 : value.hashCode();
}
//-----------------------------------------------------------------------
/**
* Returns the String value of this mutable.
*
* @return the mutable value as a string
*/
@Override
public String toString() {
return value == null ? "null" : value.toString();
}
}
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