org.eclipse.e4.xwt.vex.util.ImageHelper.java Source code

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Here is the source code for org.eclipse.e4.xwt.vex.util.ImageHelper.java

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/*******************************************************************************
 * Copyright (c) 2010 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.e4.xwt.vex.util;

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;

import org.eclipse.e4.xwt.vex.palette.PaletteResourceManager;
import org.eclipse.emf.common.util.URI;
import org.eclipse.jface.resource.ImageDescriptor;

/**
 * @author BOB
 * 
 */
public class ImageHelper {

    /**
     * Create ImageDescriptor of given path. Load images from extension registry.
     */
    public static ImageDescriptor getImageDescriptor(PaletteResourceManager tResourceManager, String iconPath) {
        if (tResourceManager == null || iconPath == null) {
            return null;
        }
        if (iconPath.startsWith("/")) {
            iconPath = iconPath.substring(1);
        }
        URI registryPath = tResourceManager.getIconsPath();
        String newIconPath = registryPath.toString() + iconPath;
        URL url;
        try {
            File file = new File(iconPath);
            if (file.exists()) {
                // try customize component first
                url = file.toURL();
            } else {
                // if don't work, try system component then
                url = new URL(newIconPath);
            }
            ImageDescriptor imageDescriptor = ImageDescriptor.createFromURL(url);
            if (imageDescriptor.getImageData() != null) {
                return imageDescriptor;
            } else {
                return null;
            }

        } catch (MalformedURLException e) {
            // if both don't work, return null
            return null;
        }
    }

}