Dépôt officiel du code source de l'ERP OpenConcerto

/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright 2011 OpenConcerto, by ILM Informatique. All rights reserved.

 *

 * The contents of this file are subject to the terms of the GNU General Public License Version 3

 * only ("GPL"). You may not use this file except in compliance with the License. You can obtain a

 * copy of the License at http://www.gnu.org/licenses/gpl-3.0.html 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.

 */

 package org.openconcerto.utils.protocol.jarjar;

/*******************************************************************************

 * Copyright (c) 2009 Pavel Savara as part of Robocode project All rights reserved. This program and

 * the accompanying materials are made available under the terms of the Common Public License v1.0

 * which accompanies this distribution, and is available at

 * http://robocode.sourceforge.net/license/cpl-v10.html

 *

 * Contributors: Pavel Savara - JarJarURLStreamHandler is just tweaked version of jar handler from

 * OpenJDK, license below

 *******************************************************************************/

/*

 * Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved. DO NOT ALTER OR REMOVE COPYRIGHT

 * NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it under the terms of the GNU

 * General Public License version 2 only, as published by the Free Software Foundation. Sun

 * designates this particular file as subject to the "Classpath" exception as provided by Sun in the

 * LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without

 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

 * General Public License version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version 2 along with this work;

 * if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA

 * 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, CA 95054 USA or visit

 * www.sun.com if you need additional information or have any questions.

 */

import java.io.IOException;

import java.io.InputStream;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLConnection;

import java.net.URLStreamHandler;

public class Handler extends URLStreamHandler {

    protected URLConnection openConnection(URL u) throws IOException {

        return new JarJarURLConnection(u);

    }

    private int indexOfBangSlash(String spec) {

        int indexOfBang = spec.length();

        while ((indexOfBang = spec.lastIndexOf(JarJarURLConnection.SEPARATOR_CHAR, indexOfBang)) != -1) {

            if ((indexOfBang != (spec.length() - 1)) && (spec.charAt(indexOfBang + 1) == '/')) {

                return indexOfBang + 1;

            } else {

                indexOfBang--;

            }

        }

        return -1;

    }

    @SuppressWarnings({ "deprecation" })

    protected void parseURL(URL url, String spec, int start, int limit) {

        String file = null;

        String ref = null;

        // first figure out if there is an anchor

        int refPos = spec.indexOf('#', limit);

        boolean refOnly = refPos == start;

        if (refPos > -1) {

            ref = spec.substring(refPos + 1, spec.length());

            if (refOnly) {

                file = url.getFile();

            }

        }

        // then figure out if the spec is

        // 1. absolute (jarjar:)

        // 2. relative (i.e. url + foo/bar/baz.ext)

        // 3. anchor-only (i.e. url + #foo), which we already did (refOnly)

        boolean absoluteSpec = false;

        if (spec.length() >= 7) {

            absoluteSpec = spec.substring(0, 7).equalsIgnoreCase("jarjar:");

        }

        spec = spec.substring(start, limit);

        if (absoluteSpec) {

            file = parseAbsoluteSpec(spec);

        } else if (!refOnly) {

            file = parseContextSpec(url, spec);

            // Canonize the result after the bangslash

            int bangSlash = indexOfBangSlash(file);

            String toBangSlash = file.substring(0, bangSlash);

            String afterBangSlash = file.substring(bangSlash);

            file = toBangSlash + afterBangSlash;

        }

        file = file != null ? "jar:" + file.replaceFirst("\\" + JarJarURLConnection.SEPARATOR, "!/") : null;

        setURL(url, "jarjar", "", -1, file, ref);

    }

    @SuppressWarnings({ "UnusedAssignment", "UnusedDeclaration" })

    private String parseAbsoluteSpec(String spec) {

        @SuppressWarnings("unused")

        URL url = null;

        int index = -1;

        // check for !/

        if ((index = indexOfBangSlash(spec)) == -1) {

            throw new IllegalArgumentException("no " + JarJarURLConnection.SEPARATOR + " in spec: " + spec);

        }

        // test the inner URL

        try {

            String innerSpec = spec.substring(0, index - 1);

            url = new URL(innerSpec);

        } catch (MalformedURLException e) {

            throw new IllegalArgumentException("invalid url: " + spec + " (" + e + ")");

        }

        return spec;

    }

    private String parseContextSpec(URL url, String spec) {

        String ctxFile = url.getFile();

        // if the spec begins with /, chop up the jar back !/

        if (spec.startsWith("/")) {

            int bangSlash = indexOfBangSlash(ctxFile);

            if (bangSlash == -1) {

                throw new NullPointerException("malformed " + "context url:" + url + ": no " + JarJarURLConnection.SEPARATOR);

            }

            ctxFile = ctxFile.substring(0, bangSlash);

        }

        if (!ctxFile.endsWith("/") && (!spec.startsWith("/"))) {

            // chop up the last component

            int lastSlash = ctxFile.lastIndexOf('/');

            if (lastSlash == -1) {

                throw new NullPointerException("malformed " + "context url:" + url);

            }

            ctxFile = ctxFile.substring(0, lastSlash + 1);

        }

        return (ctxFile + spec);

    }

    /**

     * @author Pavel Savara

     */

    static public class JarJarURLConnection extends URLConnection {

        private URLConnection connection;

        public final static char SEPARATOR_CHAR = '^';

        public final static String SEPARATOR = SEPARATOR_CHAR + "/";

        public JarJarURLConnection(URL url) throws IOException {

            super(url);

            final String file = url.getFile();

            URL inner = new URL(file);

            connection = inner.openConnection();

        }

        public void connect() throws IOException {

            if (!connected) {

                connection.connect();

                connected = true;

            }

        }

        public InputStream getInputStream() throws IOException {

            connect();

            return connection.getInputStream();

        }

    }

}