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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;


import org.eclipse.jface.viewers.ISelection;


/**
 * A mark selection can be sent out by text viewers. By checking the
 * type of the selection selection listeners can determine whether a selection
 * event is about a mark or a normal text selection.
 * 
 * This interface is not intended to be implemented by clients other than
 * {@link org.eclipse.jface.text.ITextViewer} implementers.
 * 
 *
 * @since 2.0
 */
public interface IMarkSelection extends ISelection {

	/**
	 * Returns the marked document.
	 *
	 * @return the marked document
	 */
	IDocument getDocument();

	/**
	 * Returns the mark position. The offset may be -1 if there's no marked region.
	 *
	 * @return the mark position or -1 if there is no marked region
	 */
	int getOffset();

	/**
	 * Returns the length of the mark selection. The length may be negative, if the caret
	 * is before the mark position. The length has no meaning if getOffset()
	 * returns -1.
	 *
	 * @return the length of the mark selection. Result is undefined for getOffset == -1
	 */
	int getLength();
}