ImageUtils.java

package org.eclipse.uml2.diagram.common.providers;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.Path;
import org.eclipse.emf.edit.provider.ComposedImage;
import org.eclipse.emf.edit.ui.provider.ExtendedImageRegistry;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.swt.graphics.Image;
import org.eclipse.uml2.diagram.common.UMLCommonPlugin;
import org.osgi.framework.Bundle;

public class ImageUtils {

	private static final Bundle UML_BUNDLE = UMLCommonPlugin.getInstance().getBundle();

	private static final String IMG_SYNC_DIAGRAM = "icons/ovr16/SyncDiagram.gif"; //$NON-NLS-1$

	public static final String IMG_COLLAPSE_ALL = "icons/collapseall.gif"; //$NON-NLS-1$

	public static ImageDescriptor overlay(ImageDescriptor original, ImageDescriptor overlay) {
		List<ImageDescriptor> images = new ArrayList<ImageDescriptor>(2);
		images.add(original);
		images.add(overlay);
		ComposedImage ci = new ComposedImage(images);
		return ExtendedImageRegistry.INSTANCE.getImageDescriptor(ci);
	}

	public static ImageDescriptor getPackageImage(ImageDescriptor original, boolean isSync) {
		if (!isSync) {
			return original;
		}
		return overlay(original, getSyncPackageImage());
	}

	public static ImageDescriptor getImageDescriptor(String location) {
		ImageRegistry ir = UMLCommonPlugin.getInstance().getImageRegistry();
		ImageDescriptor imageDescriptor = ir.getDescriptor(location);
		if (imageDescriptor == null) {
			imageDescriptor = ImageDescriptor.createFromURL(FileLocator.find(UML_BUNDLE, new Path(location), null));
			if (imageDescriptor == null) {
				return null;
			}
			ir.put(location, imageDescriptor);
		}
		return imageDescriptor;
	}

	private static ImageDescriptor getSyncPackageImage() {
		return getImageDescriptor(IMG_SYNC_DIAGRAM);
	}

}