org.apache.commons.lang.mutable.MutableObject Maven / Gradle / Ivy
/*
* 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.lang.mutable;
import java.io.Serializable;
/**
* A mutable Object wrapper.
*
* @since 2.1
* @author Apache Software Foundation
* @version $Id: MutableObject.java 905636 2010-02-02 14:03:32Z niallp $
*/
public class MutableObject implements Mutable, Serializable {
/**
* Required for serialization support.
*
* @see java.io.Serializable
*/
private static final long serialVersionUID = 86241875189L;
/** The mutable value. */
private Object value;
/**
* Constructs a new MutableObject with the default value of null.
*/
public MutableObject() {
super();
}
/**
* Constructs a new MutableObject with the specified value.
*
* @param value the initial value to store
*/
public MutableObject(Object value) {
super();
this.value = value;
}
//-----------------------------------------------------------------------
/**
* Gets the value.
*
* @return the value, may be null
*/
public Object getValue() {
return this.value;
}
/**
* Sets the value.
*
* @param value the value to set
*/
public void setValue(Object value) {
this.value = value;
}
//-----------------------------------------------------------------------
/**
* Compares this object against the specified object. The result is true if and only if the argument
* is not null and is a MutableObject object that contains the same Object
* value as this object.
*
* @param obj the object to compare with, null returns false
* @return true if the objects are the same; false otherwise.
*/
public boolean equals(Object obj) {
if (obj instanceof MutableObject) {
Object other = ((MutableObject) obj).value;
return value == other || (value != null && value.equals(other));
}
return false;
}
/**
* Returns the value's hash code or 0 if the value is null.
*
* @return the value's hash code or 0 if the value is null.
*/
public int hashCode() {
return value == null ? 0 : value.hashCode();
}
//-----------------------------------------------------------------------
/**
* Returns the String value of this mutable.
*
* @return the mutable value as a string
*/
public String toString() {
return value == null ? "null" : value.toString();
}
}