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/*******************************************************************************
 * Copyright (c) 2000, 2006 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.internal.views;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.ui.plugin.AbstractUIPlugin;

/**
 * The plug-in runtime class for the views UI plug-in (id
 * "org.eclipse.ui.views").
 * 
 * This class provides static methods and fields only; it is not intended to be
 * instantiated or subclassed by clients.
 * 
 * 
 * @since 2.1
 */
public final class ViewsPlugin extends AbstractUIPlugin {
	/**
	 * Views UI plug-in id (value "org.eclipse.ui.views").
	 */
	public static final String PLUGIN_ID = "org.eclipse.ui.views"; //$NON-NLS-1$

	private final static String ICONS_PATH = "$nl$/icons/full/";//$NON-NLS-1$

	private static ViewsPlugin instance;

	/**
	 * Returns the singleton instance.
	 * 
	 * @return the singleton instance.
	 */
	public static ViewsPlugin getDefault() {
		return instance;
	}

	/**
	 * Creates a new instance of the receiver.
	 * 
	 * @see org.eclipse.core.runtime.Plugin#Plugin()
	 */
	public ViewsPlugin() {
		super();
		instance = this;
	}

	/**
	 * Get the workbench image with the given path relative to ICON_PATH.
	 * 
	 * @param relativePath
	 * @return ImageDescriptor
	 */
	public static ImageDescriptor getViewImageDescriptor(String relativePath) {
		return imageDescriptorFromPlugin(PLUGIN_ID, ICONS_PATH + relativePath);
	}

	/**
	 * If it is possible to adapt the given object to the given type, this
	 * returns the adapter. Performs the following checks:
	 * 
	 * 
	 * Returns sourceObject if it is an instance of the adapter
	 * type.
	 * If sourceObject implements IAdaptable, it is queried for adapters.
	 * If sourceObject is not an instance of PlatformObject (which would
	 * have already done so), the adapter manager is queried for adapters
	 * 
	 * 
	 * Otherwise returns null.
	 * 
	 * @param sourceObject
	 *            object to adapt, or null
	 * @param adapter
	 *            type to adapt to
	 * @param activatePlugins
	 *            true if IAdapterManager.loadAdapter should be used (may
	 *            trigger plugin activation)
	 * @return a representation of sourceObject that is assignable to the
	 *         adapter type, or null if no such representation exists
	 */
	public static Object getAdapter(Object sourceObject, Class adapter,
			boolean activatePlugins) {
		// Assert.isNotNull(adapter);
		// if (sourceObject == null) {
		// return null;
		// }
		// if (adapter.isInstance(sourceObject)) {
		// return sourceObject;
		// }
		//
		// if (sourceObject instanceof IAdaptable) {
		// IAdaptable adaptable = (IAdaptable) sourceObject;
		//
		// Object result = adaptable.getAdapter(adapter);
		// if (result != null) {
		// // Sanity-check
		// Assert.isTrue(adapter.isInstance(result));
		// return result;
		// }
		// }
		//
		// if (!(sourceObject instanceof PlatformObject)) {
		// Object result;
		// if (activatePlugins) {
		// result = Platform.getAdapterManager().loadAdapter(sourceObject,
		// adapter.getName());
		// } else {
		// result = Platform.getAdapterManager().getAdapter(sourceObject,
		// adapter);
		// }
		// if (result != null) {
		// return result;
		// }
		// }

		return null;
	}
}