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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;
import java.util.Objects;
/**
* A mutable {@link Object} wrapper.
*
* @param <T> the type to set and get
* @since 2.1
*/
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}.
*/
public MutableObject() {
}
/**
* Constructs a new MutableObject with the specified value.
*
* @param value the initial value to store
*/
public MutableObject(final T value) {
this.value = value;
}
/**
* Gets the value.
*
* @return the value, may be null
*/
@Override
public T getValue() {
return this.value;
}
/**
* Sets the value.
*
* @param value the value to set
*/
@Override
public void setValue(final T value) {
this.value = value;
}
/**
* Compares this object against the specified object. The result is {@code true} if and only if the argument
* is not {@code null} and is a {@link MutableObject} object that contains the same {@link T}
* value as this object.
*
* @param obj the object to compare with, {@code null} returns {@code false}
* @return {@code true} if the objects are the same;
* {@code true} if the objects have equivalent {@code value} fields;
* {@code false} otherwise.
*/
@Override
public boolean equals(final Object obj) {
if (obj == null) {
return false;
}
if (this == obj) {
return true;
}
if (this.getClass() == obj.getClass()) {
final MutableObject<?> that = (MutableObject<?>) obj;
return this.value.equals(that.value);
}
return false;
}
/**
* Returns the value's hash code or {@code 0} if the value is {@code null}.
*
* @return the value's hash code or {@code 0} if the value is {@code null}.
*/
@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 Objects.toString(value);
}
}
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