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/*******************************************************************************
 * Copyright (c) 2000, 2008 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;

import org.eclipse.jface.resource.ImageDescriptor;

/**
 * A perspective descriptor describes a perspective in an
 * IPerspectiveRegistry.
 * 
 * A perspective is a template for view visibility, layout, and action
 * visibility within a workbench page. There are two types of perspective: a
 * predefined perspective and a custom perspective.
 * 

 * A predefined perspective is defined by an extension to the workbench's
 * perspective extension point ("org.eclipse.ui.perspectives"). The
 * extension defines a id, label, and IPerspectiveFactory. A
 * perspective factory is used to define the initial layout for a page.
 * A custom perspective is defined by the user. In this case a predefined
 * perspective is modified to suit a particular task and saved as a new
 * perspective. The attributes for the perspective are stored in a separate file
 * in the workbench's metadata directory.
 * 
 * 
 * 
 * Within a page the user can open any of the perspectives known to the
 * workbench's perspective registry, typically by selecting one from the
 * workbench's Open Perspective menu. When selected, the views and
 * actions within the active page rearrange to reflect the perspective.
 * 
 * 
 * This interface is not intended to be implemented by clients.
 * 
 * 
 * @see IPerspectiveRegistry
 * @noimplement This interface is not intended to be implemented by clients.
 */
public interface IPerspectiveDescriptor {
	/**
	 * Returns the description of this perspective. This is the value of its
	 * "description" attribute.
	 * 
	 * @return the description
	 * @since 3.0
	 */
	public String getDescription();

	/**
	 * Returns this perspective's id. For perspectives declared via an
	 * extension, this is the value of its "id" attribute.
	 * 
	 * @return the perspective id
	 */
	public String getId();

	/**
	 * Returns the descriptor of the image to show for this perspective. If the
	 * extension for this perspective specifies an image, the descriptor for it
	 * is returned. Otherwise a default image is returned.
	 * 
	 * @return the descriptor of the image to show for this perspective
	 */
	public ImageDescriptor getImageDescriptor();

	/**
	 * Returns this perspective's label. For perspectives declared via an
	 * extension, this is the value of its "label" attribute.
	 * 
	 * @return the label
	 */
	public String getLabel();
}