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. * *
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. * *
The format of an absolute URI (see the RFCs mentioned above) is: *
* 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 = "{" | "}" | "|" | "\" | "^" | "`"
* Currently URIs containing userinfo or reg_name * are not supported. * The opaque_part of a non-hierarchical URI is treated as if * if were a path 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); } } */ }