/**
* Copyright (C) FuseSource, Inc.
* http://fusesource.com
*
* 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 org.jboss.test.osgi.ds.support;
import java.util.concurrent.atomic.AtomicReference;
/**
* A reference that validates its content on {@link #get()}
*
* @author Thomas.Diesler@jboss.com
* @since 13-Sep-2013
*/
public class ValidatingReference<T> {
private final AtomicReference<T> reference = new AtomicReference<T>();
/**
* Bind the given reference
*/
public void bind(T ref) {
reference.set(ref);
}
/**
* Unbind the given reference
*/
public void unbind(T ref) {
reference.compareAndSet(ref, null);
}
/**
* Get the referenced instance
* @throws InvalidComponentException If the reference is not valid
*/
public T get() {
T ref = reference.get();
if (ref == null)
throw new InvalidComponentException();
return ref;
}
/**
* Get the referenced instance
* @return The references instance or null
*/
public T getOptional() {
return reference.get();
}
}