org.vclipse.base.ui.util.ClasspathAwareImageHelper.java Source code

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Here is the source code for org.vclipse.base.ui.util.ClasspathAwareImageHelper.java

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/*******************************************************************************
 * Copyright (c) 2010 - 2013 webXcerpt Software GmbH.
 * 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:
 *        webXcerpt Software GmbH - initial creator
 *       www.webxcerpt.com
 ******************************************************************************/
package org.vclipse.base.ui.util;

import java.net.URL;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.Image;
import org.eclipse.xtext.ui.PluginImageHelper;

/**
 * Searches for images not only in the current bundle, but in all resources on the classpath.
 * 
 * copied and adapted from Xtext source code
 *
 */
public class ClasspathAwareImageHelper extends PluginImageHelper implements IExtendedImageHelper {

    @Override
    public Image getImage(String imageName) {
        String imgname = imageName == null ? getDefaultImage() : imageName;
        if (imgname != null) {
            Image result = null;
            URL imgUrl = getPlugin().getBundle().getResource(getPathSuffix() + imgname); // getEntry has been changed to getResource such that classpath is searched for
            if (imgUrl != null) {
                ImageDescriptor id = null;
                result = getPlugin().getImageRegistry().get(imgUrl.toExternalForm());
                if (result == null) {
                    id = ImageDescriptor.createFromURL(imgUrl);
                    if (id != null) {
                        result = id.createImage();
                        getPlugin().getImageRegistry().put(imgUrl.toExternalForm(), result);
                    }
                }
                return result;
            }
            String notFound = getNotFound();
            if (!imgname.equals(notFound)) {
                return getImage(notFound);
            }
        }
        return null;
    }

    public ImageDescriptor getImageDescriptor(String name) {
        return getImageDescriptor(getImage(name));
    }

    public ImageDescriptor getImageDescriptor(Image image) {
        return image == null ? null : ImageDescriptor.createFromImage(image);
    }
}