org.eclipse.ocl.examples.modelregistry.ui.icons.Icons.java Source code

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Here is the source code for org.eclipse.ocl.examples.modelregistry.ui.icons.Icons.java

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/**
 * <copyright>
 *
 * Copyright (c) 2007, 2012 E.D.Willink 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:
 *     E.D.Willink - initial API and implementation
 *
 * </copyright>
 *
 * $Id: Icons.java,v 1.2 2010/04/08 06:26:03 ewillink Exp $
 */
package org.eclipse.ocl.examples.modelregistry.ui.icons;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;

public final class Icons {
    private static final Map<String, Image> stringToImage = new HashMap<String, Image>();

    private Icons() {
    }

    private static String getFullIconName(Enum<?> icon) {
        return icon.getDeclaringClass().getName() + "." + icon.name();
    }

    /**
     * Clients should not dispose the Image returned.
     * 
     * @param icon the key (one of the constants defined in this class)
     * @return the Image associated with the given key
     */
    public static Image getImage(Enum<?> icon) {
        if (icon == null)
            return null;
        String key = getFullIconName(icon);
        Image img = stringToImage.get(key);
        if (img == null) {
            img = getImageDescriptor(icon).createImage();
            stringToImage.put(key, img);
        }
        return img;
    }

    public static ImageDescriptor getImageDescriptor(Enum<?> icon) {
        return ImageDescriptor.createFromFile(icon.getDeclaringClass(), icon.name() + ".gif");
    }

    public static Image getImage(Enum<?> imageIcon, Enum<?> overlayIcon, Enum<?> underlayIcon) {
        if (imageIcon == null)
            return null;
        Image baseImage = getImage(imageIcon);
        if ((overlayIcon == null) && (underlayIcon == null))
            return baseImage;
        StringBuilder s = new StringBuilder();
        s.append(getFullIconName(imageIcon));
        s.append("+");
        if (overlayIcon != null)
            s.append(getFullIconName(overlayIcon));
        s.append("+");
        if (underlayIcon != null)
            s.append(getFullIconName(underlayIcon));
        String key = s.toString();
        Image image = stringToImage.get(key);
        if (image == null) {
            Rectangle bounds = baseImage.getBounds();
            Point size = new Point(bounds.width, bounds.height);
            ImageDescriptor overlayImageDescriptor = overlayIcon != null ? getImageDescriptor(overlayIcon) : null;
            ImageDescriptor underlayImageDescriptor = underlayIcon != null ? getImageDescriptor(underlayIcon)
                    : null;
            ImageDescriptor imageDescriptor = new DecorationOverlayIcon(baseImage, // FIXME -- not available on Eclipse 3.2
                    new ImageDescriptor[] { null, null, overlayImageDescriptor, null, underlayImageDescriptor },
                    size);
            image = imageDescriptor.createImage();
            stringToImage.put(key, image);
        }
        return image;
    }
}