org.jboss.tools.central.internal.ImageUtil.java Source code

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Here is the source code for org.jboss.tools.central.internal.ImageUtil.java

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/*************************************************************************************
 * Copyright (c) 2013 Red Hat, Inc. 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:
 *     JBoss by Red Hat - Initial implementation.
 ************************************************************************************/
package org.jboss.tools.central.internal;

import java.io.File;
import java.io.InputStream;
import java.net.URI;
import java.net.URL;
import java.net.URLDecoder;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;

import org.apache.commons.io.IOUtils;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.Device;
import org.eclipse.swt.graphics.Image;
import org.jboss.tools.central.JBossCentralActivator;

/**
 * IMage utility class
 * 
 * @author Fred Bricon
 */
public class ImageUtil {

    /**
     * Creates an image from an {@link URL}.
     * If the iconUrl points at a jar file, the created image doesn't not leak file handle. 
     */
    public static Image createImageFromUrl(Device device, URL iconUrl) {

        if (!iconUrl.getProtocol().equals("jar")) {
            ImageDescriptor descriptor = ImageDescriptor.createFromURL(iconUrl);
            return descriptor.createImage();
        }

        //Load from jar:
        Image image = null;
        try {
            String fileName = iconUrl.getFile();
            if (fileName.contains("!")) {
                String[] location = fileName.split("!");
                fileName = location[0];
                String imageName = URLDecoder.decode(location[1].substring(1), "utf-8");
                File file = new File(new URI(fileName));
                JarFile jarFile = null;
                InputStream inputStream = null;
                try {
                    jarFile = new JarFile(file);
                    ZipEntry imageEntry = jarFile.getEntry(imageName);
                    if (imageEntry != null) {
                        inputStream = jarFile.getInputStream(imageEntry);
                        image = new Image(device, inputStream);
                    }
                } finally {
                    IOUtils.closeQuietly(inputStream);
                    try {
                        if (jarFile != null) {
                            jarFile.close();
                        }
                    } catch (Exception e) {
                        //ignore
                    }
                }
            }
        } catch (Exception e) {
            JBossCentralActivator.log(e);
        }

        return image;
    }
}