org.eclipse.jface.text/src/org/eclipse/jface/text/formatter/IFormattingStrategyExtension.java

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.jface.text.formatter;

/**
 * Extension interface for <code>IFormattingStrategy</code>.
 * <p>
 * Updates formatting strategies to be able to receive a more general <code>IFormattingContext</code>
 * object from its associated content formatters.
 * <p>
 * Each formatting process calls the strategy's methods in the following
 * sequence:
 * <ul>
 * <li><code>formatterStarts</code>
 * <li><code>format</code>
 * <li><code>formatterStops</code>
 * </ul>
 * <p>
 * Note that multiple calls to <code>formatterStarts</code> can be issued to
 * a strategy before launching the formatting process with <code>format</code>.
 * <p>
 * This interface must be implemented by clients. Implementers should be
 * registered with a content formatter in order get involved in the formatting
 * process.
 * 
 * @see IFormattingContext
 * @since 3.0
 */
public interface IFormattingStrategyExtension {

	/**
	 * Formats the region with the properties indicated in the formatting
	 * context previously supplied by <code>formatterStarts(IFormattingContext)</code>.
	 */
	void format();

	/**
	 * Informs the strategy about the start of a formatting process in which it
	 * will participate.
	 * 
	 * @param context
	 *                  Formatting context used in the corresponding formatting
	 *                  process.
	 */
	void formatterStarts(IFormattingContext context);

	/**
	 * Informs the strategy that the formatting process in which it has
	 * participated has been finished.
	 */
	void formatterStops();
}