org.jboss.tools.common.model.util.ModelImages.java Source code

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Here is the source code for org.jboss.tools.common.model.util.ModelImages.java

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/*******************************************************************************
 * Copyright (c) 2007 Exadel, Inc. and Red Hat, Inc.
 * Distributed under license by Red Hat, Inc. All rights reserved.
 * This program is 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:
 *     Exadel, Inc. and Red Hat, Inc. - initial API and implementation
 ******************************************************************************/
package org.jboss.tools.common.model.util;

import java.net.MalformedURLException;
import java.net.URL;

import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.commands.ICommandImageService;
import org.jboss.tools.common.model.Messages;
import org.jboss.tools.common.model.XModelObjectConstants;
import org.jboss.tools.common.model.plugin.ModelPlugin;
import org.osgi.framework.Bundle;

public class ModelImages {
    private static ModelImages instance;

    static {
        instance = new ModelImages(ModelPlugin.getDefault().getBundle().getEntry(XModelObjectConstants.SEPARATOR));
    }

    public static Image getImage(String key) {
        Image result = null;
        ImageRegistry registry = ModelPlugin.getDefault().getImageRegistry();
        synchronized (registry) {
            result = registry.get(key);
        }
        if (result == null || result.isDisposed()) {
            result = instance.createImageDescriptor(key).createImage();
            if (result != null) {
                synchronized (registry) {
                    registry.remove(key);
                    registry.put(key, result);
                }
            }
        }
        return result;
    }

    private URL baseUrl;

    protected ModelImages(URL url) {
        baseUrl = url;
    }

    public ImageDescriptor createImageDescriptor(String key) {
        if (key.startsWith("command:")) { //$NON-NLS-1$
            key = key.substring("command:".length()); //$NON-NLS-1$
            IWorkbench w = ModelPlugin.getDefault().getWorkbench();
            ICommandImageService s = (ICommandImageService) w.getService(ICommandImageService.class);
            return s.getImageDescriptor(key);
        }
        URL url = baseUrl;
        if (key.startsWith("plugin:")) { //$NON-NLS-1$
            key = key.substring("plugin:".length()); //$NON-NLS-1$
            int i = key.indexOf(":"); //$NON-NLS-1$
            String plugin = key.substring(0, i);
            key = key.substring(i + 1);
            Bundle bundle = Platform.getBundle(plugin);
            if (bundle != null) {
                url = bundle.getEntry(XModelObjectConstants.SEPARATOR);
            }
        }
        try {
            return ImageDescriptor.createFromURL(makeIconFileURL(url, key));
        } catch (MalformedURLException e) {
            return ImageDescriptor.getMissingImageDescriptor();
        }
    }

    private URL makeIconFileURL(URL url, String name) throws MalformedURLException {
        if (name == null)
            throw new MalformedURLException(Messages.ModelImages_NullImageName);
        return new URL(url, name);
    }

}