/*******************************************************************************
 * 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.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>
	 * @deprecated Use {@link #codeComplete(int, ICompletionRequestor)} instead.
	 */
	void codeComplete(int offset, ICodeCompletionRequestor requestor)
			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>
	 * @since 2.0
	 */
	// TODO (jerome - once CompletionRequestor is working) @ deprecated Use
	// {@link #codeComplete(int, CompletionRequestor)} instead.
	void codeComplete(int offset, ICompletionRequestor requestor)
			throws JavaModelException;

	/**
	 * <b>DO NOT USE</b>: This API element was added in anticipation of J2SE
	 * 1.5 support, which is planned for the next release of Eclipse after 3.0.
	 * It is currently unimplemented, and the API may change slightly before
	 * reaching its final form.
	 * <p>
	 * 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.
	 * <p>
	 * 
	 * @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 3.0
	 */
	void codeComplete(int offset, CompletionRequestor requestor)
			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. It considers types in
	 * the working copies with the given owner first. In other words, the
	 * owner's working copies will take precedence over their original
	 * compilation units in the workspace.
	 * <p>
	 * Note that if a working copy is empty, it will be as if the original
	 * compilation unit had been deleted.
	 * </p>
	 * 
	 * @param offset
	 *            the given offset position
	 * @param requestor
	 *            the given completion requestor
	 * @param owner
	 *            the owner of working copies that take precedence over their
	 *            original compilation units
	 * @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 3.0
	 */
	// TODO (jerome - once CompletionRequestor is working) @ deprecated Use
	// {@link #codeComplete(int, CompletionRequestor, WorkingCopyOwner)}
	// instead.
	void codeComplete(int offset, ICompletionRequestor requestor,
			WorkingCopyOwner owner) throws JavaModelException;

	/**
	 * <b>DO NOT USE</b>: This API element was added in anticipation of J2SE
	 * 1.5 support, which is planned for the next release of Eclipse after 3.0.
	 * It is currently unimplemented, and the API may change slightly before
	 * reaching its final form.
	 * <p>
	 * 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. It considers types in
	 * the working copies with the given owner first. In other words, the
	 * owner's working copies will take precedence over their original
	 * compilation units in the workspace.
	 * <p>
	 * Note that if a working copy is empty, it will be as if the original
	 * compilation unit had been deleted.
	 * </p>
	 * 
	 * @param offset
	 *            the given offset position
	 * @param requestor
	 *            the given completion requestor
	 * @param owner
	 *            the owner of working copies that take precedence over their
	 *            original compilation units
	 * @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 3.0
	 */
	void codeComplete(int offset, CompletionRequestor requestor,
			WorkingCopyOwner owner) throws JavaModelException;

	/**
	 * Returns the Java elements correspondiing to the given selected text in
	 * this compilation unit. 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
	 * @return the Java elements correspondiing to the given selected text
	 * 
	 * @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;

	/**
	 * Returns the Java elements correspondiing to the given selected text in
	 * this compilation unit. The <code>offset</code> is the 0-based index of
	 * the first selected character. The <code>length</code> is the number of
	 * selected characters. It considers types in the working copies with the
	 * given owner first. In other words, the owner's working copies will take
	 * precedence over their original compilation units in the workspace.
	 * <p>
	 * Note that if a working copy is empty, it will be as if the original
	 * compilation unit had been deleted.
	 * </p>
	 * 
	 * @param offset
	 *            the given offset position
	 * @param length
	 *            the number of selected characters
	 * @param owner
	 *            the owner of working copies that take precedence over their
	 *            original compilation units
	 * @return the Java elements correspondiing to the given selected text
	 * 
	 * @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>
	 * @since 3.0
	 */
	IJavaElement[] codeSelect(int offset, int length, WorkingCopyOwner owner)
			throws JavaModelException;
}