/*

 * Copyright (c) 1994, 2018, Oracle and/or its affiliates. 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.net.www.protocol.file;

import java.net.InetAddress;

import java.net.URLConnection;

import java.net.URL;

import java.net.Proxy;

import java.net.MalformedURLException;

import java.net.URLStreamHandler;

import java.io.InputStream;

import java.io.IOException;

import sun.net.www.ParseUtil;

import java.io.File;

/**

 * Open an file input stream given a URL.

 * @author      James Gosling

 */

public class Handler extends URLStreamHandler {

    private String getHost(URL url) {

        String host = url.getHost();

        if (host == null)

            host = "";

        return host;

    }

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

        /*

         * Ugly backwards compatibility. Flip any file separator

         * characters to be forward slashes. This is a nop on Unix

         * and "fixes" win32 file paths. According to RFC 2396,

         * only forward slashes may be used to represent hierarchy

         * separation in a URL but previous releases unfortunately

         * performed this "fixup" behavior in the file URL parsing code

         * rather than forcing this to be fixed in the caller of the URL

         * class where it belongs. Since backslash is an "unwise"

         * character that would normally be encoded if literally intended

         * as a non-seperator character the damage of veering away from the

         * specification is presumably limited.

         */

        super.parseURL(u, spec.replace(File.separatorChar, '/'), start, limit);

    }

    public synchronized URLConnection openConnection(URL u)

        throws IOException {

        return openConnection(u, null);

    }

    public synchronized URLConnection openConnection(URL u, Proxy p)

           throws IOException {

        String host = u.getHost();

        if (host == null || host.isEmpty() || host.equals("~") ||

            host.equalsIgnoreCase("localhost")) {

            File file = new File(ParseUtil.decode(u.getPath()));

            return createFileURLConnection(u, file);

        }

        /* If you reach here, it implies that you have a hostname

           so attempt an ftp connection.

         */

        URLConnection uc;

        URL ru;

        try {

            ru = new URL("ftp", host, u.getFile() +

                             (u.getRef() == null ? "": "#" + u.getRef()));

            if (p != null) {

                uc = ru.openConnection(p);

            } else {

                uc = ru.openConnection();

            }

        } catch (IOException e) {

            uc = null;

        }

        if (uc == null) {

            throw new IOException("Unable to connect to: " +

                                                       u.toExternalForm());

        }

        return uc;

    }

    // Template method to be overridden by Java Plug-in. [stanleyh]

    //

    protected URLConnection createFileURLConnection(URL u, File file)

    {

        return new FileURLConnection(u, file);

    }

    /**

     * Compares the host components of two URLs.

     * @param u1 the URL of the first host to compare

     * @param u2 the URL of the second host to compare

     * @return  {@code true} if and only if they

     * are equal, {@code false} otherwise.

     */

    protected boolean hostsEqual(URL u1, URL u2) {

        /*

         * Special case for file: URLs

         * per RFC 1738 no hostname is equivalent to 'localhost'

         * i.e. file:///path is equal to file://localhost/path

         */

        String s1 = u1.getHost();

        String s2 = u2.getHost();

            return true;

            return true;

        return super.hostsEqual(u1, u2);

    }

}