| /******************************************************************************* |
| * Copyright (c) 2000, 2013 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ant.internal.ui; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.eclipse.swt.graphics.Image; |
| import org.eclipse.swt.widgets.Display; |
| |
| import org.eclipse.core.runtime.Assert; |
| |
| import org.eclipse.jface.resource.ImageDescriptor; |
| |
| /** |
| * A registry that maps <code>ImageDescriptors</code> to <code>Image</code>. |
| */ |
| public class ImageDescriptorRegistry { |
| |
| private Map<ImageDescriptor, Image> fRegistry = Collections.synchronizedMap(new HashMap<ImageDescriptor, Image>(10)); |
| private Display fDisplay; |
| |
| /** |
| * Creates a new image descriptor registry for the current or default display, respectively. |
| */ |
| public ImageDescriptorRegistry() { |
| this(AntUIPlugin.getStandardDisplay()); |
| } |
| |
| /** |
| * Creates a new image descriptor registry for the given display. All images managed by this registry will be disposed when the display gets |
| * disposed. |
| * |
| * @param display |
| * the display the images managed by this registry are allocated for |
| */ |
| public ImageDescriptorRegistry(Display display) { |
| fDisplay = display; |
| Assert.isNotNull(fDisplay); |
| hookDisplay(); |
| } |
| |
| /** |
| * Returns the image associated with the given image descriptor. |
| * |
| * @param descriptor |
| * the image descriptor for which the registry manages an image |
| * @return the image associated with the image descriptor or <code>null</code> if the image descriptor can't create the requested image. |
| */ |
| public Image get(ImageDescriptor descriptor) { |
| if (descriptor == null) |
| descriptor = ImageDescriptor.getMissingImageDescriptor(); |
| |
| Image result = fRegistry.get(descriptor); |
| if (result != null) |
| return result; |
| |
| Assert.isTrue(fDisplay == AntUIPlugin.getStandardDisplay(), AntUIModelMessages.ImageDescriptorRegistry_Allocating_image_for_wrong_display_1); |
| result = descriptor.createImage(); |
| if (result != null) |
| fRegistry.put(descriptor, result); |
| return result; |
| } |
| |
| /** |
| * Disposes all images managed by this registry. |
| */ |
| public void dispose() { |
| for (Image image : fRegistry.values()) { |
| image.dispose(); |
| } |
| fRegistry.clear(); |
| } |
| |
| private void hookDisplay() { |
| fDisplay.asyncExec(() -> fDisplay.disposeExec(() -> dispose())); |
| } |
| } |