| /* |
| * Copyright (c) 2020 Kentyou. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Kentyou - initial API and implementation |
| */ |
| package org.eclipse.sensinact.gateway.common.primitive; |
| |
| import java.lang.ref.WeakReference; |
| |
| /** |
| * An extended {@link WeakReference} referencing |
| * a {@link PrimitiveDescription} |
| * |
| * @author <a href="mailto:christophe.munilla@cea.fr">Christophe Munilla</a> |
| */ |
| public class WeakDescription<P extends PrimitiveDescription> extends WeakReference<P> { |
| /** |
| * Constructor |
| * |
| * @param referent the {@link PrimitiveDescription} object the WeakReference |
| * to instantiate refers to |
| */ |
| public WeakDescription(P referent) { |
| super(referent); |
| } |
| |
| /** |
| * This method is called whenever the described |
| * {@link Primitive} value is changed. |
| * |
| * @param updated the updated value of the |
| * described {@link Primitive} |
| */ |
| public void update(Object updated) { |
| P description = null; |
| if ((description = super.get()) == null) { |
| return; |
| } |
| description.update(updated); |
| } |
| } |
