components/visual-panels/core/src/java/util/com/oracle/solaris/vp/util/misc/predicate/NonNullPredicate.java
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.
*/
package com.oracle.solaris.vp.util.misc.predicate;
/**
* The {@code NonNullPredicate<T>} class is a {@code Predicate} that returns
* {@code true} iff an object is not {@code null}. The {@link #getInstance}
* method is the preferred way to get an instance of this class.
*/
public class NonNullPredicate<T> implements Predicate<T> {
//
// Static data
//
private static final NonNullPredicate<Object> instance =
new NonNullPredicate<Object>();
//
// Predicate methods
//
/**
* Returns true.
*
* @param o
* the object to ignore
*
* @return {@code true} iff {@code o} is not {@code null}
*/
@Override
public boolean test(T o) {
return o != null;
}
//
// Static methods
//
/**
* Gets a type-safe, immutable, singleton instance of this class.
*/
@SuppressWarnings({"unchecked"})
public static <T> NonNullPredicate<T> getInstance() {
return (NonNullPredicate<T>)instance;
}
}