plugins/org.eclipse.ease.lang.python/src/org/eclipse/ease/lang/python/debugger/ResourceHelper.java

/*******************************************************************************
 * Copyright (c) 2014 Christian Pontesegger 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:
 *     Christian Pontesegger - initial API and implementation
 *******************************************************************************/
package org.eclipse.ease.lang.python.debugger;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.jar.JarFile;

import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.Platform;

public class ResourceHelper {

	/**
	 * Returns an {@link InputStream} for a given resource within a bundle.
	 *
	 * @param bundle
	 *            qualified name of the bundle to resolve
	 * @param path
	 *            full path of the file to load
	 * @return input stream to resource
	 */
	public static InputStream getResourceStream(final String bundle, final String path) {
		String location = Platform.getBundle(bundle).getLocation();
		try {
			if (location.toLowerCase().endsWith(".jar")) {
				// we need to open a jar file
				final int pos = location.indexOf("file:");
				if (pos != -1) {
					location = location.substring(pos + 5);
					if (!location.startsWith("/")) {
						// relative location, add full path to executable
						location = (Platform.getInstallLocation().getURL().toString() + location).substring(6);
					}
					JarFile file = null;
					try {
						file = new JarFile(location);
						if (path.startsWith("/"))
							return file.getInputStream(file.getEntry(path.substring(1)));
						else
							return file.getInputStream(file.getEntry(path));
					} finally {
						if (file != null) {
							file.close();
						}
					}
				}

			} else {
				final URL url = Platform.getBundle(bundle).getResource(path);
				return FileLocator.resolve(url).openStream();
			}
		} catch (final IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return null;
	}
}