/*******************************************************************************
 * Copyright (c) 2001, 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.wst.xml.ui.internal.provisional;

import org.eclipse.jface.text.BadLocationException;
import org.eclipse.wst.sse.ui.internal.provisional.extensions.ISourceEditingTextTools;
import org.eclipse.wst.sse.ui.internal.provisional.extensions.breakpoint.NodeLocation;
import org.w3c.dom.Document;
import org.w3c.dom.Node;

public interface IDOMSourceEditingTextTools extends ISourceEditingTextTools {
	/**
	 * Returns a W3C DOM document
	 * 
	 * @return Document object or <code>null</code> if corresponding
	 *         document does not exist
	 */
	Document getDOMDocument();

	/**
	 * Returns the W3C DOM Node at the given offset
	 * 
	 * @param offset
	 *            the offset within the IDocument
	 * @return a Node at that location, if one is present
	 * 
	 * @throws BadLocationException
	 *             for invalid offsets
	 */
	Node getNode(int offset) throws BadLocationException;

	/**
	 * Returns a NodeLocation object describing the position information of
	 * the Node's start and end tags.
	 * 
	 * @param node
	 * @return The NodeLocation for this Node, null for unsupported Node
	 *         instances.
	 */
	NodeLocation getNodeLocation(Node node);

	/**
	 * Returns the current server-side page language for the Document of the
	 * given Node.
	 * 
	 * @return The server-side page language for this nodem null for Nodes
	 *         within unsupported Documents.
	 */
	String getPageLanguage(Node node);

	/**
	 * Returns start offset of given Node.
	 * 
	 * @param node
	 *            w3c <code>Node</code> object to check
	 * @return the start offset or -1 for unsupported Nodes
	 */
	int getStartOffset(Node node);
}