/*

 * Copyright (c) 2000, 2001, 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 com.sun.jndi.toolkit.url;

import java.net.MalformedURLException;

/**

 * A Uri object represents an absolute Uniform Resource Identifier

 * (URI) as defined by RFC 2396 and updated by RFC 2373 and RFC 2732.

 * The most commonly used form of URI is the Uniform Resource Locator (URL).

 *

 * <p> The java.net.URL class cannot be used to parse URIs since it

 * requires the installation of URL stream handlers that may not be

 * available.  The hack of getting around this by temporarily

 * replacing the scheme part of a URI is not appropriate here: JNDI

 * service providers must work on older Java platforms, and we want

 * new features and bug fixes that are not available in old versions

 * of the URL class.

 *

 * <p> It may be appropriate to drop this code in favor of the

 * java.net.URI class.  The changes would need to be written so as to

 * still run on pre-1.4 platforms not containing that class.

 *

 * <p> The format of an absolute URI (see the RFCs mentioned above) is:

 * <p><blockquote><pre>

 *      absoluteURI   = scheme ":" ( hier_part | opaque_part )

 *

 *      scheme        = alpha *( alpha | digit | "+" | "-" | "." )

 *

 *      hier_part     = ( net_path | abs_path ) [ "?" query ]

 *      opaque_part   = uric_no_slash *uric

 *

 *      net_path      = "//" authority [ abs_path ]

 *      abs_path      = "/"  path_segments

 *

 *      authority     = server | reg_name

 *      reg_name      = 1*( unreserved | escaped | "$" | "," |

 *                          ";" | ":" | "@" | "&" | "=" | "+" )

 *      server        = [ [ userinfo "@" ] hostport ]

 *      userinfo      = *( unreserved | escaped |

 *                         ";" | ":" | "&" | "=" | "+" | "$" | "," )

 *

 *      hostport      = host [ ":" port ]

 *      host          = hostname | IPv4address | IPv6reference

 *      port          = *digit

 *

 *      IPv6reference = "[" IPv6address "]"

 *      IPv6address   = hexpart [ ":" IPv4address ]

 *      IPv4address   = 1*3digit "." 1*3digit "." 1*3digit "." 1*3digit

 *      hexpart       = hexseq | hexseq "::" [ hexseq ] | "::" [ hexseq ]

 *      hexseq        = hex4 *( ":" hex4)

 *      hex4          = 1*4hex

 *

 *      path          = [ abs_path | opaque_part ]

 *      path_segments = segment *( "/" segment )

 *      segment       = *pchar *( ";" param )

 *      param         = *pchar

 *      pchar         = unreserved | escaped |

 *                      ":" | "@" | "&" | "=" | "+" | "$" | ","

 *

 *      query         = *uric

 *

 *      uric          = reserved | unreserved | escaped

 *      uric_no_slash = unreserved | escaped | ";" | "?" | ":" | "@" |

 *                      "&" | "=" | "+" | "$" | ","

 *      reserved      = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" |

 *                      "$" | "," | "[" | "]"

 *      unreserved    = alphanum | mark

 *      mark          = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"

 *      escaped       = "%" hex hex

 *      unwise        = "{" | "}" | "|" | "\" | "^" | "`"

 * </pre></blockquote>

 *

 * <p> Currently URIs containing <tt>userinfo</tt> or <tt>reg_name</tt>

 * are not supported.

 * The <tt>opaque_part</tt> of a non-hierarchical URI is treated as if

 * if were a <tt>path</tt> without a leading slash.

 */

public class Uri {

    protected String uri;

    protected String scheme;

    protected String host = null;

    protected int port = -1;

    protected boolean hasAuthority;

    protected String path;

    protected String query = null;

    /**

     * Creates a Uri object given a URI string.

     */

    public Uri(String uri) throws MalformedURLException {

        init(uri);

    }

    /**

     * Creates an uninitialized Uri object. The init() method must

     * be called before any other Uri methods.

     */

    protected Uri() {

    }

    /**

     * Initializes a Uri object given a URI string.

     * This method must be called exactly once, and before any other Uri

     * methods.

     */

    protected void init(String uri) throws MalformedURLException {

        this.uri = uri;

        parse(uri);

    }

    /**

     * Returns the URI's scheme.

     */

    public String getScheme() {

        return scheme;

    }

    /**

     * Returns the host from the URI's authority part, or null

     * if no host is provided.  If the host is an IPv6 literal, the

     * delimiting brackets are part of the returned value (see

     * {@link java.net.URI#getHost}).

     */

    public String getHost() {

        return host;

    }

    /**

     * Returns the port from the URI's authority part, or -1 if

     * no port is provided.

     */

    public int getPort() {

        return port;

    }

    /**

     * Returns the URI's path.  The path is never null.  Note that a

     * slash following the authority part (or the scheme if there is

     * no authority part) is part of the path.  For example, the path

     * of "http://host/a/b" is "/a/b".

     */

    public String getPath() {

        return path;

    }

    /**

     * Returns the URI's query part, or null if no query is provided.

     * Note that a query always begins with a leading "?".

     */

    public String getQuery() {

        return query;

    }

    /**

     * Returns the URI as a string.

     */

    public String toString() {

        return uri;

    }

    /*

     * Parses a URI string and sets this object's fields accordingly.

     */

    private void parse(String uri) throws MalformedURLException {

        int i;  // index into URI

        i = uri.indexOf(':');                           // parse scheme

        if (i < 0) {

            throw new MalformedURLException("Invalid URI: " + uri);

        }

        scheme = uri.substring(0, i);

        i++;                                            // skip past ":"

        hasAuthority = uri.startsWith("//", i);

        if (hasAuthority) {                             // parse "//host:port"

            i += 2;                                     // skip past "//"

            int slash = uri.indexOf('/', i);

            if (slash < 0) {

                slash = uri.length();

            }

            if (uri.startsWith("[", i)) {               // at IPv6 literal

                int brac = uri.indexOf(']', i + 1);

                if (brac < 0 || brac > slash) {

                    throw new MalformedURLException("Invalid URI: " + uri);

                }

                host = uri.substring(i, brac + 1);      // include brackets

                i = brac + 1;                           // skip past "[...]"

            } else {                                    // at host name or IPv4

                int colon = uri.indexOf(':', i);

                int hostEnd = (colon < 0 || colon > slash)

                    ? slash

                    : colon;

                if (i < hostEnd) {

                    host = uri.substring(i, hostEnd);

                }

                i = hostEnd;                            // skip past host

            }

            if ((i + 1 < slash) &&

                        uri.startsWith(":", i)) {       // parse port

                i++;                                    // skip past ":"

                port = Integer.parseInt(uri.substring(i, slash));

            }

            i = slash;                                  // skip to path

        }

        int qmark = uri.indexOf('?', i);                // look for query

        if (qmark < 0) {

            path = uri.substring(i);

        } else {

            path = uri.substring(i, qmark);

            query = uri.substring(qmark);

        }

    }

/*

    // Debug

    public static void main(String args[]) throws MalformedURLException {

        for (int i = 0; i < args.length; i++) {

            Uri uri = new Uri(args[i]);

            String h = (uri.getHost() != null) ? uri.getHost() : "";

            String p = (uri.getPort() != -1) ? (":" + uri.getPort()) : "";

            String a = uri.hasAuthority ? ("//" + h + p) : "";

            String q = (uri.getQuery() != null) ? uri.getQuery() : "";

            String str = uri.getScheme() + ":" + a + uri.getPath() + q;

            if (! uri.toString().equals(str)) {

                System.out.println(str);

            }

            System.out.println(h);

        }

    }

*/

}