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

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Here is the source code for com.iw.plugins.spindle.Images.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
 * Geoffrey Longman.
 * Portions created by the Initial Developer are Copyright (C) 2001-2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * 
 *  glongman@gmail.com
 *
 * ***** END LICENSE BLOCK ***** */
package com.iw.plugins.spindle;

import java.io.IOException;
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;

/**
 * Convenience class for accessing shared images
 */
public class Images {
    static private URL BASE_URL = null;
    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 getSharedImage("missing.gif");
        }
        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 = UIPlugin.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) {
        String iconPath = "icons/full/" + name;

        try {
            return new URL(getBaseURL(), iconPath);

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

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

    private static synchronized final URL getBaseURL() {
        if (BASE_URL == null) {
            URL installUrl = UIPlugin.getDefault().getBundle().getEntry("/");
            try {
                BASE_URL = checkBase(Platform.resolve(installUrl));
            } catch (IOException e) {
                UIPlugin.log(e);
            }
        }
        return BASE_URL;
    }

}