org.eclipse.jdt.ui/jar in jar loader/org/eclipse/jdt/internal/jarinjarloader/RsrcURLStreamHandlerFactory.java

/*******************************************************************************
 * Copyright (c) 2008, 2009 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:
 *     Ferenc Hechler - initial API and implementation
 *     Ferenc Hechler, ferenc_hechler@users.sourceforge.net - 219530 [jar application] add Jar-in-Jar ClassLoader option
 *     Ferenc Hechler, ferenc_hechler@users.sourceforge.net - 262746 [jar exporter] Create a builder for jar-in-jar-loader.zip
 *     Ferenc Hechler, ferenc_hechler@users.sourceforge.net - 262748 [jar exporter] extract constants for string literals in JarRsrcLoader et al.
 *******************************************************************************/
package org.eclipse.jdt.internal.jarinjarloader;

import java.net.URLStreamHandler;
import java.net.URLStreamHandlerFactory;

/**
 * This class will be compiled into the binary jar-in-jar-loader.zip. This ZIP is used for the
 * "Runnable JAR File Exporter"
 *
 * @since 3.5
 */
public class RsrcURLStreamHandlerFactory implements URLStreamHandlerFactory {

	private ClassLoader classLoader;
	private URLStreamHandlerFactory chainFac;

	public RsrcURLStreamHandlerFactory(ClassLoader cl) {
		this.classLoader = cl;
	}

	@Override
	public URLStreamHandler createURLStreamHandler(String protocol) {
		if (JIJConstants.INTERNAL_URL_PROTOCOL.equals(protocol))
			return new RsrcURLStreamHandler(classLoader);
		if (chainFac != null)
			return chainFac.createURLStreamHandler(protocol);
		return null;
	}

	/**
	 * Allow one other URLStreamHandler to be added.
	 * URL.setURLStreamHandlerFactory does not allow
	 * multiple factories to be added.
	 * The chained factory is called for all other protocols,
	 * except "rsrc". Use null to clear previously set Handler.
	 * @param fac another factory to be chained with ours.
	 */
	public void setURLStreamHandlerFactory(URLStreamHandlerFactory fac) {
		chainFac = fac;
	}

}