| /* |
| * 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 <code>Object</code> wrapper. |
| * |
| * @since 2.1 |
| * @author Apache Software Foundation |
| * @version $Id$ |
| */ |
| 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 <code>null</code>. |
| */ |
| 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 <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>Object</code> |
| * value as this object. |
| * |
| * @param obj the object to compare with, null returns false |
| * @return <code>true</code> if the objects are the same; <code>false</code> 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 <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>. |
| */ |
| 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(); |
| } |
| |
| } |