/*********************************************************************
* Copyright (c) 2005, 2019 SAP SE
*
* This program and the accompanying materials are made
* available under the terms of the Eclipse Public License 2.0
* which is available at https://www.eclipse.org/legal/epl-2.0/
*
* Contributors:
*    SAP SE - initial API, implementation and documentation
*
* SPDX-License-Identifier: EPL-2.0
**********************************************************************/
package org.eclipse.graphiti.tb;

import org.eclipse.graphiti.mm.pictograms.PictogramElement;

/**
 * The Interface IDecorator. Decorators are a means to modify the visualization
 * of shapes in a diagram without modifying the dirty state of the editor. This
 * is done by the Graphiti framework by simply applying the decorators to a
 * shape after it has been drawn on the screen as defined in the pictograms
 * model.
 * <p>
 * The list of decorators that shall be applied to a {@link PictogramElement} is
 * queried from the
 * {@link IToolBehaviorProvider#getDecorators(PictogramElement)} method when a
 * shape is drawn or updated on the diagram by the Graphiti framework.
 * 
 * @noimplement This interface is not intended to be implemented by clients.
 * @noextend This interface is not intended to be extended by clients.
 */
public interface IDecorator {

	/**
	 * Gets the message to be shown as a tooltip for the decorator. This can
	 * e.g. be an error message stating why the shape is marked.
	 * 
	 * @return the message
	 */
	String getMessage();

	/**
	 * Sets the message to be shown as a tooltip for the decorator. This can
	 * e.g. be an error message stating why the shape is marked.
	 * 
	 * @param message
	 *            the new message
	 */
	void setMessage(String message);
}