com.iw.plugins.spindle.TapestryImages.java Source code

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Here is the source code for com.iw.plugins.spindle.TapestryImages.java

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/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Spindle, an Eclipse Plugin for Tapestry.
 *
 * The Initial Developer of the Original Code is
 * Intelligent Works Incorporated.
 * Portions created by the Initial Developer are Copyright (C) 2002
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * 
 *  glongman@intelligentworks.com
 *
 * ***** END LICENSE BLOCK ***** */
package com.iw.plugins.spindle;

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

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;

/**
 * Convenience class for accessing gettting shared images
 */
public class TapestryImages {
    static private URL BASE_URL = TapestryPlugin.getDefault().getDescriptor().getInstallURL();
    static private ImageRegistry Registry = null;

    public static Image getSharedImage(String name) {
        ImageRegistry registry = getImageRegistry();
        URL imageURL = getImageURL(name);
        String urlString = null;
        if (imageURL != null) {
            urlString = imageURL.toString();
        } else {
            return registry.get("missing");
        }
        Image result = registry.get(urlString);
        if (result == null) {
            ImageDescriptor descriptor = ImageDescriptor.createFromURL(imageURL);
            Registry.put(urlString, descriptor.createImage());
            result = registry.get(urlString);
        }
        return result;
    }

    public static ImageDescriptor getImageDescriptor(String name) {
        return createImageDescriptor(getImageURL(name));
    }

    static private ImageRegistry getImageRegistry() {
        if (Registry == null) {
            Registry = TapestryPlugin.getDefault().getImageRegistry();
            Registry.put("missing", ImageDescriptor.getMissingImageDescriptor().createImage());
        }
        return Registry;
    }

    /**
     * Utility method to create an <code>ImageDescriptor</code>
     * from a path to a file.
     */
    public static ImageDescriptor createImageDescriptor(URL imageURL) {
        if (imageURL == null) {
            return ImageDescriptor.getMissingImageDescriptor();
        }
        return ImageDescriptor.createFromURL(imageURL);
    }

    public static URL getImageURL(String name) {
        checkBase();
        String iconPath;
        if (Display.getCurrent().getIconDepth() > 4)
            iconPath = "icons/full/";
        else
            iconPath = "icons/basic/";
        iconPath += name;
        try {
            return new URL(BASE_URL, iconPath);

        } catch (MalformedURLException e) {
        }
        return null;
    }

    static private void checkBase() {
        String current = BASE_URL.getPath();
        int index = current.indexOf("_");
        if (index != -1) {
            try {
                current = current.substring(0, index) + "/";
                BASE_URL = new URL(BASE_URL.getProtocol(), "", current);
            } catch (MalformedURLException mex) {
            }
        }
    }

}