/*******************************************************************************
 * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v0.5 
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v05.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 ******************************************************************************/
package net.sourceforge.phpdt.core;

/**
 * Common protocol for Java elements that support source code assist and code
 * resolve.
 * <p>
 * This interface is not intended to be implemented by clients.
 * </p>
 */
public interface ICodeAssist {

	/**
	 * Performs code completion at the given offset position in this compilation unit,
	 * reporting results to the given completion requestor. The <code>offset</code>
	 * is the 0-based index of the character, after which code assist is desired.
	 * An <code>offset</code> of -1 indicates to code assist at the beginning of this
	 * compilation unit.
	 *
	 * @param offset the given offset position
	 * @param requestor the given completion requestor
	 * @exception JavaModelException if code assist could not be performed. Reasons include:<ul>
	 *  <li>This Java element does not exist (ELEMENT_DOES_NOT_EXIST)</li>
	 *  <li> The position specified is < -1 or is greater than this compilation unit's
	 *      source length (INDEX_OUT_OF_BOUNDS)
	 * </ul>
	 *
	 * @exception IllegalArgumentException if <code>requestor</code> is <code>null</code>
	 * @since 2.0
	 * 	 */
	void codeComplete(int offset, ICompletionRequestor requestor)
		throws JavaModelException;
	/**
	 * Performs code selection on the given selected text in this compilation unit,
	 * reporting results to the given selection requestor. The <code>offset</code>
	 * is the 0-based index of the first selected character. The <code>length</code> 
	 * is the number of selected characters.
	 * 
	 * @param offset the given offset position
	 * @param length the number of selected characters
	 *
	 * @exception JavaModelException if code resolve could not be performed. Reasons include:
	 *  <li>This Java element does not exist (ELEMENT_DOES_NOT_EXIST)</li>
	 *  <li> The range specified is not within this element's
	 *      source range (INDEX_OUT_OF_BOUNDS)
	 * </ul>
	 *
	 */
	IJavaElement[] codeSelect(int offset, int length) throws JavaModelException;

	/**
	 * Performs code completion at the given offset position in this compilation unit,
	 * reporting results to the given completion requestor. The <code>offset</code>
	 * is the 0-based index of the character, after which code assist is desired.
	 * An <code>offset</code> of -1 indicates to code assist at the beginning of this
	 * compilation unit.
	 * 
	 * @param offset the given offset position
	 * @param requestor the given completion requestor
	 *
	 * @exception JavaModelException if code assist could not be performed. Reasons include:<ul>
	 *  <li>This Java element does not exist (ELEMENT_DOES_NOT_EXIST)</li>
	 *  <li> The position specified is < -1 or is greater than this compilation unit's
	 *      source length (INDEX_OUT_OF_BOUNDS)
	 * </ul>
	 *
	 * @exception IllegalArgumentException if <code>requestor</code> is <code>null</code>
	 * @deprecated - use codeComplete(int, ICompletionRequestor) instead
	 */
//	void codeComplete(int offset, ICodeCompletionRequestor requestor)
//		throws JavaModelException;
}