/*******************************************************************************
 * Copyright (c) 2007, 2012 Association for Decentralized Information Management
 * in Industry THTH ry.
 * 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:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.document.ui.contribution;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.IDecoration;
import org.simantics.browsing.ui.content.ImageDecorator;
import org.simantics.browsing.ui.model.imagedecorators.ImageDecorationRule;
import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.exception.DatabaseException;
import org.simantics.document.DocumentResource;
import org.simantics.document.ui.Activator;
import org.simantics.utils.ui.gfx.DecorationOverlayIcon;

/**
 * @author Tuukka Lehtonen
 */
public class DocumentVersionImageDecorationRule implements ImageDecorationRule {
	
    @Override
    public boolean isCompatible(Class<?> contentType) {
        return contentType.equals(Resource.class);
    }

    @Override
    public ImageDecorator getImageDecorator(ReadGraph graph, Object content) throws DatabaseException {
    	
        DocumentResource DOC = DocumentResource.getInstance(graph);
        if (graph.hasStatement((Resource)content, DOC.HasNewerVersion))
        	return new Dec(Activator.getDefault().clock_red);
        
        return null;
        
    }
    
	private class Dec implements ImageDecorator {
		private ImageDescriptor decorator;
		
		public Dec(ImageDescriptor decorator) {
			this.decorator = decorator;
		}
		@SuppressWarnings("unchecked")
		public <Image extends Object> Image decorateImage(Image image, String column, int itemIndex) {
			return (Image) getDecoration((ImageDescriptor) image,decorator);
		};
	}

    private ImageDescriptor getDecoration(ImageDescriptor original, ImageDescriptor img) {
        //ImageDescriptor img = Activator.getDefault().DOCUMENT_DECORATION_ICON;
        return (original == null) ? img
                : new DecorationOverlayIcon(original, img, IDecoration.BOTTOM_RIGHT);
    }

}