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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.jface.text.contentassist;

import org.eclipse.swt.graphics.Image;


/**
 * The interface of context information presented to the user and
 * generated by content assist processors.
 * 
 * In order to provide backward compatibility for clients of
 * IContextInformation, extension interfaces are used to
 * provide a means of evolution. The following extension interfaces
 * exist:
 * 

 * {@link org.eclipse.jface.text.contentassist.IContextInformationExtension}
 * since version 2.0 introducing the ability to freely position the
 * context information.
 * 
 * 
 * 
 * The interface can be implemented by clients. By default, clients use
 * {@link org.eclipse.jface.text.contentassist.ContextInformation} as
 * the standard implementer of this interface.
 * 
 *
 * @see IContentAssistProcessor
 */
public interface IContextInformation {

	/**
	 * Returns the string to be displayed in the list of contexts.
	 * This method is used to supply a unique presentation for
	 * situations where the context is ambiguous. These strings are
	 * used to allow the user to select the specific context.
	 *
	 * @return the string to be displayed for the context
	 */
	String getContextDisplayString();

	/**
	 * Returns the image for this context information.
	 * The image will be shown to the left of the display string.
	 *
	 * @return the image to be shown or null if no image is desired
	 */
	Image getImage();

	/**
	 * Returns the string to be displayed in the tool tip like information popup.
	 *
	 * @return the string to be displayed
	 */
	String getInformationDisplayString();

	/**
	 * Compares the given object with this receiver. Two context informations are equal if there
	 * information display strings and their context display strings are equal.
	 * 
	 * Note: As specified in {@link Object#equals(Object)} clients will most likely
	 * also have to implement {@link Object#hashCode()}.
	 * 
	 * 
	 * @see Object#equals(Object)
	 */
	boolean equals(Object object);
}