/*******************************************************************************
* Copyright (c) 2008, 2014 Stuart McCulloch
* 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:
* Stuart McCulloch - initial API and implementation
*******************************************************************************/
package org.eclipse.sisu.peaberry.util;
import java.util.Map;
import org.eclipse.sisu.peaberry.Import;
import org.eclipse.sisu.peaberry.builders.ImportDecorator;
/**
* Skeletal implementation to simplify development of {@link ImportDecorator}s.
* <p>
* Developers only have to extend this class and provide an implementation of
* the {@link #decorate(Object, Map)} method, which takes the original service
* instance and associated attribute map, and returns a decorated instance.
*
* @author mcculls@gmail.com (Stuart McCulloch)
*/
public abstract class AbstractDecorator<S>
implements ImportDecorator<S> {
public final <T extends S> Import<T> decorate(final Import<T> service) {
return new DelegatingImport<T>(service) {
@Override
@SuppressWarnings("unchecked")
public T get() {
return (T) decorate(service.get(), service.attributes());
}
};
}
/**
* Decorate the current service instance.
*
* @param instance service instance
* @param attributes service attributes
* @return decorated service instance
*/
protected abstract S decorate(S instance, Map<String, ?> attributes);
}