/*******************************************************************************
 * Copyright (c) 2009, 2010 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.swt.accessibility;

/**
 * This adapter class provides default implementations for the
 * methods in the <code>AccessibleHyperlinkListener</code> interface.
 * <p>
 * Classes that wish to deal with <code>AccessibleHyperlink</code> events can
 * extend this class and override only the methods that they are
 * interested in.
 * </p>
 *
 * @see AccessibleHyperlinkListener
 * @see AccessibleHyperlinkEvent
 *
 * @since 3.6
 */
public class AccessibleHyperlinkAdapter implements AccessibleHyperlinkListener {
	/**
	 * Returns the anchor for the link at the specified index.
	 * 
	 * @param e an event object containing the following fields:<ul>
	 * <li>[in] index - a 0 based index identifying the anchor if this object
	 * 		has more than one link, as in the case of an image map</li>
	 * <li>[typical out] result - the returned anchor</li>
	 * <li>[optional out] accessible - the returned anchor.
	 * 		Note: The returned anchor can either be a string or an accessible.
	 * 		For example, for a text link this could be the substring of the containing string
	 * 		where the substring is overridden with link behavior, and for an image link this could be
	 * 		the accessible for the image.</li>
	 * </ul>
	 */
	public void getAnchor(AccessibleHyperlinkEvent e) {}

	/**
	 * Returns the target of the link at the specified index.
	 * 
	 * @param e an event object containing the following fields:<ul>
	 * <li>[in] index - a 0 based index identifying the anchor if this object
	 * 		has more than one link, as in the case of an image map</li>
	 * <li>[typical out] result - the returned target</li>
	 * <li>[optional out] accessible - the returned target.
	 * 		Note: The returned target can either be a string or an accessible.
	 * 		For example, this could be a string URI, or the accessible for the target
	 * 		object to be activated when the link is activated.</li>
	 * </ul>
	 */
	public void getAnchorTarget(AccessibleHyperlinkEvent e) {}

	/**
	 * Returns the 0 based character offset at which the textual representation of the hyperlink starts.
	 * <p>
	 * The returned value is related to the AccessibleTextExtended interface of the object that
	 * owns this hyperlink.
	 * </p>
	 * 
	 * @param e an event object containing the following fields:<ul>
	 * <li>[out] index</li>
	 * </ul>
	 */
	public void getStartIndex(AccessibleHyperlinkEvent e) {}

	/**
	 * Returns the 0 based character offset at which the textual representation of the hyperlink ends.
	 * <p>
	 * The returned value is related to the AccessibleTextExtended interface of the object that
	 * owns this hyperlink. The character at the index is not part of the hypertext.
	 * </p>
	 * 
	 * @param e an event object containing the following fields:<ul>
	 * <li>[out] index</li>
	 * </ul>
	 */
	public void getEndIndex(AccessibleHyperlinkEvent e) {}
}
