org.eclipse.core.runtime.PlatformObject Maven / Gradle / Ivy

/*******************************************************************************
 * Copyright (c) 2000, 2015 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Sergey Prigogin (Google) - use parameterized types (bug 442021)
 *******************************************************************************/
package org.eclipse.core.runtime;

import org.eclipse.core.internal.runtime.AdapterManager;

/**
 * An abstract superclass implementing the IAdaptable
 * interface. getAdapter invocations are directed
 * to the platform's adapter manager.
 * 
 * Note: In situations where it would be awkward to subclass this
 * class, the same effect can be achieved simply by implementing
 * the {@link IAdaptable} interface and explicitly forwarding
 * the getAdapter request to an implementation
 * of the {@link IAdapterManager} service. The method would look like:
 * 
 *  *     public <T> T getAdapter(Class<T> adapter) {
 *         IAdapterManager manager = ...;//lookup the IAdapterManager service         
 *         return manager.getAdapter(this, adapter);
 *     }
 * 
 * 
 * This class can be used without OSGi running.
 * 

 * Clients may subclass.
 * 
 *
 * @see IAdapterManager
 * @see IAdaptable
 */
public abstract class PlatformObject implements IAdaptable {
	/**
	 * Constructs a new platform object.
	 */
	public PlatformObject() {
		super();
	}

	/**
	 * Returns an object which is an instance of the given class
	 * associated with this object. Returns null if
	 * no such object can be found.
	 * 
	 * This implementation of the method declared by IAdaptable
	 * passes the request along to the platform's adapter manager; roughly
	 * Platform.getAdapterManager().getAdapter(this, adapter).
	 * Subclasses may override this method (however, if they do so, they
	 * should invoke the method on their superclass to ensure that the
	 * Platform's adapter manager is consulted).
	 * 
	 *
	 * @param adapter the class to adapt to
	 * @return the adapted object or null
	 * @see IAdaptable#getAdapter(Class)
	 */
	@Override
	public  T getAdapter(Class adapter) {
		return AdapterManager.getDefault().getAdapter(this, adapter);
	}
}