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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2007-2011 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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 */

package com.sun.enterprise.module.bootstrap;

import java.io.File;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URISyntaxException;
import java.net.URL;

/**
 * Finds out where a class file is loaded from.
 *
 * @author dochez
 */
public class Which {
    public static File jarFile(Class clazz) throws IOException {
        String resourceName = clazz.getName().replace(".","/")+".class";
        URL resource = clazz.getClassLoader().getResource(resourceName);
        if (resource==null) {
            throw new IllegalArgumentException("Cannot get bootstrap path from "+ clazz + " class location, aborting");
        }

        if (resource.getProtocol().equals("jar")) {
            try {
                JarURLConnection c = (JarURLConnection) resource.openConnection();
                URL jarFile = c.getJarFileURL();
                try {
                    return new File(jarFile.toURI());
                } catch (URISyntaxException e) {
                    return new File(jarFile.getPath());
                }
            } catch (IOException e) {
                throw new IllegalArgumentException("Cannot open jar file "+resource, e);
            }
        } else
            throw new IllegalArgumentException("Don't support packaging "+resource+" , please contribute !");
    }
}