/*
* Copyright (c) 2010-2013 Evolveum
*
* 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 com.evolveum.midpoint.util;
/**
* Very simple object to hold a single value. This comes handy when a final value is required but there is a
* need to use immutable value (e.g. int, String). This comes very handy in Java anonymous instances (almost-closures).
*
* @author Radovan Semancik
*/
public class Holder<T> {
private T value;
public Holder() {
super();
this.value = null;
}
public Holder(T value) {
super();
this.value = value;
}
public T getValue() {
return value;
}
public void setValue(T value) {
this.value = value;
}
public boolean isEmpty() {
return value == null;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((value == null) ? 0 : value.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Holder other = (Holder) obj;
if (value == null) {
if (other.value != null)
return false;
} else if (!value.equals(other.value))
return false;
return true;
}
@Override
public String toString() {
return "Holder(" + value + ")";
}
}