org.eclipse.jpt.common.ui.tests.ImageDescriptorTest.java Source code

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Here is the source code for org.eclipse.jpt.common.ui.tests.ImageDescriptorTest.java

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/*******************************************************************************
 * Copyright (c) 2012 Oracle. 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:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.common.ui.tests;

import java.lang.reflect.Field;
import junit.framework.TestCase;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.resource.LocalResourceManager;
import org.eclipse.jface.resource.ResourceManager;
import org.eclipse.swt.graphics.Image;

/**
 * This test case will verify that a class's constants
 * <p>
 * Construct the test case with the class that defines the image descriptors.
 */
@SuppressWarnings("nls")
public class ImageDescriptorTest extends TestCase {
    private final Class<?> clazz;

    public ImageDescriptorTest(Class<?> clazz) {
        super(buildName(clazz));
        this.clazz = clazz;
    }

    private static String buildName(Class<?> clazz) {
        return ImageDescriptorTest.class.getSimpleName() + ": " + clazz.getName();
    }

    @Override
    protected void runTest() throws Throwable {
        ResourceManager resourceManager = this.buildResourceManager();
        try {
            this.runTest(resourceManager);
        } finally {
            resourceManager.dispose();
        }
    }

    protected void runTest(ResourceManager resourceManager) throws Throwable {
        for (Field field : this.clazz.getFields()) {
            Object value = field.get(null);
            if (value instanceof ImageDescriptor) {
                ImageDescriptor descriptor = (ImageDescriptor) value;
                try {
                    Image image = resourceManager.createImage(descriptor);
                    assertNotNull(image);
                } catch (RuntimeException ex) {
                    fail("Problem loading image for ImageDescriptor defined in static field '"
                            + this.clazz.getSimpleName() + '.' + field.getName() + "': " + descriptor + " - " + ex);
                }
            } else {
                // ignore non-image descriptors (e.g. strings);
                // fields should probably not be null...
                if (value == null) {
                    fail("The static field '" + this.clazz.getSimpleName() + '.' + field.getName() + "' is null.");
                }
            }
        }
    }

    protected ResourceManager buildResourceManager() {
        return new LocalResourceManager(this.getParentResourceManager());
    }

    private ResourceManager getParentResourceManager() {
        return JFaceResources.getResources();
    }
}