/*******************************************************************************
 * 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 net.sourceforge.phpdt.internal.ui.text.java;

import net.sourceforge.phpdt.core.ICompilationUnit;
import net.sourceforge.phpdt.core.dom.CompilationUnit;

/**
 * Context information for quick fix and quick assist processors.
 * <p>
 * Note: this interface is not intended to be implemented.
 * </p>
 * 
 * @since 3.0
 */
public interface IInvocationContext {

	/**
	 * @return Returns the current compilation unit.
	 */
	ICompilationUnit getCompilationUnit();

	/**
	 * @return Returns the offset of the current selection
	 */
	int getSelectionOffset();

	/**
	 * @return Returns the length of the current selection
	 */
	int getSelectionLength();

	/**
	 * Returns an AST of the compilation unit, possibly only a partial AST
	 * focused on the selection offset (see
	 * {@link net.sourceforge.phpdt.core.dom.ASTParser#setFocalPosition(int)}).
	 * The returned AST is shared and therefore protected and cannot be
	 * modified. The client must check the AST API level and do nothing if they
	 * are given an AST they can't handle. (see
	 * {@link net.sourceforge.phpdt.core.dom.AST#apiLevel()}).
	 * 
	 * @return Returns the root of the AST corresponding to the current
	 *         compilation unit.
	 */
	CompilationUnit getASTRoot();

	/**
	 * Convenience method to evaluate the AST node covering the current
	 * selection.
	 * 
	 * @return Returns the node that covers the location of the problem
	 */
	// ASTNode getCoveringNode();
	/**
	 * Convenience method to evaluate the AST node that is covered by the
	 * current selection.
	 * 
	 * @return Returns the node that is covered by the location of the problem
	 */
	// ASTNode getCoveredNode();
}