ForwardingRegistrable.java

package sk.stuba.fiit.perconik.core;

import com.google.common.collect.ForwardingObject;

/**
 * A registrable which forwards all its method calls to another registrable.
 * Subclasses should override one or more methods to modify the behavior
 * of the backing registrable as desired per the decorator pattern.
 *
 * <p>Note that this class does <i>not</i> forward the {@code equals}
 * and {@code hashCode} methods through to the backing object.
 * See {@link ForwardingObject} for more details.
 *
 * @author Pavol Zbell
 * @since 1.0
 */
public abstract class ForwardingRegistrable extends ForwardingObject implements Registrable {
  /**
   * Constructor for use by subclasses.
   */
  protected ForwardingRegistrable() {}

  @Override
  protected abstract Registrable delegate();

  public void preRegister() {
    this.delegate().preRegister();
  }

  public void postRegister() {
    this.delegate().postRegister();
  }

  public void preUnregister() {
    this.delegate().preUnregister();
  }

  public void postUnregister() {
    this.delegate().postUnregister();
  }
}