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/*******************************************************************************
 * Copyright (c) 2000, 2005 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.contentassist;

import org.eclipse.jface.text.IDocument;


/**
 * Extends {@link org.eclipse.jface.text.contentassist.ICompletionProposal}
 * with the following functions:
 * 
 * 	handling of trigger characters other than ENTER
 * 	completion proposal validation for a given offset
 * 	context information can be freely positioned
 * 
 *
 * @since 2.0
 */
public interface ICompletionProposalExtension {

	/**
	 * Applies the proposed completion to the given document. The insertion
	 * has been triggered by entering the given character at the given offset.
	 * This method assumes that {@link #isValidFor(IDocument, int)} returns
	 * true if called for offset.
	 *
	 * @param document the document into which to insert the proposed completion
	 * @param trigger the trigger to apply the completion
	 * @param offset the offset at which the trigger has been activated
	 */
	void apply(IDocument document, char trigger, int offset);

	/**
	 * Returns whether this completion proposal is valid for the given
	 * position in the given document.
	 *
	 * @param document the document for which the proposal is tested
	 * @param offset the offset for which the proposal is tested
	 * @return true iff valid
	 */
	boolean isValidFor(IDocument document, int offset);

	/**
	 * Returns the characters which trigger the application of this completion proposal.
	 *
	 * @return the completion characters for this completion proposal or null
	 *		if no completion other than the new line character is possible
	 */
	char[] getTriggerCharacters();

	/**
	 * Returns the position to which the computed context information refers to or
	 * -1 if no context information can be provided by this completion proposal.
	 *
	 * @return the position to which the context information refers to or -1 for no information
	 */
	int getContextInformationPosition();
}