bundles/org.eclipse.ui/Eclipse UI Text Editor/org/eclipse/ui/texteditor/BasicMarkerUpdater.java

package org.eclipse.ui.texteditor;

/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */


import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.Position;

import org.eclipse.core.resources.IMarker;


/**
 * Updates a marker's positional attributes which are 
 * start position, end position, and line number.
 */
public final class BasicMarkerUpdater implements IMarkerUpdater {
	
	private final static String[] ATTRIBUTES= {
		IMarker.CHAR_START,
		IMarker.CHAR_END,
		IMarker.LINE_NUMBER
	};
	
	/**
	 * Creates a new basic marker updater.
	 */
	public BasicMarkerUpdater() {
		super();
	}
		
	/*
	 * @see IMarkerUpdater#getAttribute()
	 */
	public String[] getAttribute() {
		return ATTRIBUTES;
	}
	
	/*
	 * @see IMarkerUpdater#getMarkerType()
	 */
	public String getMarkerType() {
		return null;
	}
	
	/*
	 * @see IMarkerUpdater#updateMarker(IMarker, IDocument, Position)
	 */
	public boolean updateMarker(IMarker marker, IDocument document, Position position) {
		
		if (position == null)
			return true;
			
		if (position.isDeleted())
			return false;
		
		boolean changed= false;
		int markerStart= MarkerUtilities.getCharStart(marker);
		int markerEnd= MarkerUtilities.getCharEnd(marker);
		
		if (markerStart != -1 && markerEnd != -1) {
			
			int offset= position.getOffset();
			if (markerStart != offset) {
				MarkerUtilities.setCharStart(marker, offset);
				changed= true;
			}
			
			offset += position.getLength();
			if (markerEnd != offset) {
				MarkerUtilities.setCharEnd(marker, offset);
				changed= true;
			}
		}
		
		if (changed && MarkerUtilities.getLineNumber(marker) != -1) {
			try {
				// marker line numbers are 1-based
				MarkerUtilities.setLineNumber(marker, document.getLineOfOffset(position.getOffset()) + 1);
			} catch (BadLocationException x) {
			}
		}
		
		return true;
	}
}