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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.quickassist;

import org.eclipse.jface.text.source.ISourceViewer;


/**
 * Context information for quick fix and quick assist processors.
 * 
 * This interface can be implemented by clients.
 *
 * @since 3.2
 */
public interface IQuickAssistInvocationContext {

	/**
	 * Returns the offset where quick assist was invoked.
	 *
	 * @return the invocation offset or -1 if unknown
	 */
	int getOffset();

	/**
	 * Returns the length of the selection at the invocation offset.
	 *
	 * @return the length of the current selection or -1 if none or unknown
	 */
	int getLength();

	/**
	 * Returns the viewer for this context.
	 *
	 * @return the viewer or null if not available
	 */
	ISourceViewer getSourceViewer();
}