org.glassfish.pfl.basic.contain.SynchronizedHolder Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.glassfish.pfl.basic.contain ;
/** Type safe holder that can hold any non-primitive type.
* Useful for out parameters and passing arguments that need
* to be set later.
*/
public class SynchronizedHolder
{
private T _content ;
public SynchronizedHolder( T content )
{
this._content = content ;
}
public SynchronizedHolder()
{
this( null ) ;
}
public synchronized T content()
{
return _content ;
}
public synchronized void content( T content )
{
this._content = content ;
}
@Override
public synchronized boolean equals( Object obj )
{
if (!(obj instanceof SynchronizedHolder)) {
return false;
}
SynchronizedHolder other = SynchronizedHolder.class.cast( obj ) ;
if (_content == null) {
return other.content() == null ;
} else {
return _content.equals( other.content() ) ;
}
}
@Override
public synchronized int hashCode()
{
return _content.hashCode() ;
}
@Override
public synchronized String toString()
{
return "SynchronizedHolder[" + _content + "]" ;
}
}