My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

Showing the changes to java/pkg/java/net/URL.java (1 of 18352 files). Show all

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	1	+/*
	2	+ * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
	3	+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	4	+ *
	5	+ * This code is free software; you can redistribute it and/or modify it
	6	+ * under the terms of the GNU General Public License version 2 only, as
	7	+ * published by the Free Software Foundation. Oracle designates this
	8	+ * particular file as subject to the "Classpath" exception as provided
	9	+ * by Oracle in the LICENSE file that accompanied this code.
	10	+ *
	11	+ * This code is distributed in the hope that it will be useful, but WITHOUT
	12	+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	13	+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	14	+ * version 2 for more details (a copy is included in the LICENSE file that
	15	+ * accompanied this code).
	16	+ *
	17	+ * You should have received a copy of the GNU General Public License version
	18	+ * 2 along with this work; if not, write to the Free Software Foundation,
	19	+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	20	+ *
	21	+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	22	+ * or visit www.oracle.com if you need additional information or have any
	23	+ * questions.
	24	+ */
	25	+
	26	+package java.net;
	27	+
	28	+import java.io.IOException;
	29	+import java.io.InputStream;
	30	+import java.io.OutputStream;
	31	+import java.util.Hashtable;
	32	+import java.util.StringTokenizer;
	33	+import sun.security.util.SecurityConstants;
	34	+
	35	+/**
	36	+ * Class <code>URL</code> represents a Uniform Resource
	37	+ * Locator, a pointer to a "resource" on the World
	38	+ * Wide Web. A resource can be something as simple as a file or a
	39	+ * directory, or it can be a reference to a more complicated object,
	40	+ * such as a query to a database or to a search engine. More
	41	+ * information on the types of URLs and their formats can be found at:
	42	+ * <blockquote>
	43	+ * <a href="http://www.socs.uts.edu.au/MosaicDocs-old/url-primer.html">
	44	+ * <i>http://www.socs.uts.edu.au/MosaicDocs-old/url-primer.html</i></a>
	45	+ * </blockquote>
	46	+ * <p>
	47	+ * In general, a URL can be broken into several parts. The previous
	48	+ * example of a URL indicates that the protocol to use is
	49	+ * <code>http</code> (HyperText Transfer Protocol) and that the
	50	+ * information resides on a host machine named
	51	+ * <code>www.socs.uts.edu.au</code>. The information on that host
	52	+ * machine is named <code>/MosaicDocs-old/url-primer.html</code>. The exact
	53	+ * meaning of this name on the host machine is both protocol
	54	+ * dependent and host dependent. The information normally resides in
	55	+ * a file, but it could be generated on the fly. This component of
	56	+ * the URL is called the <i>path</i> component.
	57	+ * <p>
	58	+ * A URL can optionally specify a "port", which is the
	59	+ * port number to which the TCP connection is made on the remote host
	60	+ * machine. If the port is not specified, the default port for
	61	+ * the protocol is used instead. For example, the default port for
	62	+ * <code>http</code> is <code>80</code>. An alternative port could be
	63	+ * specified as:
	64	+ * <blockquote><pre>
	65	+ * http://www.socs.uts.edu.au:80/MosaicDocs-old/url-primer.html
	66	+ * </pre></blockquote>
	67	+ * <p>
	68	+ * The syntax of <code>URL</code> is defined by <a
	69	+ * href="http://www.ietf.org/rfc/rfc2396.txt"><i>RFC 2396: Uniform
	70	+ * Resource Identifiers (URI): Generic Syntax</i></a>, amended by <a
	71	+ * href="http://www.ietf.org/rfc/rfc2732.txt"><i>RFC 2732: Format for
	72	+ * Literal IPv6 Addresses in URLs</i></a>. The Literal IPv6 address format
	73	+ * also supports scope_ids. The syntax and usage of scope_ids is described
	74	+ * <a href="Inet6Address.html#scoped">here</a>.
	75	+ * <p>
	76	+ * A URL may have appended to it a "fragment", also known
	77	+ * as a "ref" or a "reference". The fragment is indicated by the sharp
	78	+ * sign character "#" followed by more characters. For example,
	79	+ * <blockquote><pre>
	80	+ * http://java.sun.com/index.html#chapter1
	81	+ * </pre></blockquote>
	82	+ * <p>
	83	+ * This fragment is not technically part of the URL. Rather, it
	84	+ * indicates that after the specified resource is retrieved, the
	85	+ * application is specifically interested in that part of the
	86	+ * document that has the tag <code>chapter1</code> attached to it. The
	87	+ * meaning of a tag is resource specific.
	88	+ * <p>
	89	+ * An application can also specify a "relative URL",
	90	+ * which contains only enough information to reach the resource
	91	+ * relative to another URL. Relative URLs are frequently used within
	92	+ * HTML pages. For example, if the contents of the URL:
	93	+ * <blockquote><pre>
	94	+ * http://java.sun.com/index.html
	95	+ * </pre></blockquote>
	96	+ * contained within it the relative URL:
	97	+ * <blockquote><pre>
	98	+ * FAQ.html
	99	+ * </pre></blockquote>
	100	+ * it would be a shorthand for:
	101	+ * <blockquote><pre>
	102	+ * http://java.sun.com/FAQ.html
	103	+ * </pre></blockquote>
	104	+ * <p>
	105	+ * The relative URL need not specify all the components of a URL. If
	106	+ * the protocol, host name, or port number is missing, the value is
	107	+ * inherited from the fully specified URL. The file component must be
	108	+ * specified. The optional fragment is not inherited.
	109	+ * <p>
	110	+ * The URL class does not itself encode or decode any URL components
	111	+ * according to the escaping mechanism defined in RFC2396. It is the
	112	+ * responsibility of the caller to encode any fields, which need to be
	113	+ * escaped prior to calling URL, and also to decode any escaped fields,
	114	+ * that are returned from URL. Furthermore, because URL has no knowledge
	115	+ * of URL escaping, it does not recognise equivalence between the encoded
	116	+ * or decoded form of the same URL. For example, the two URLs:<br>
	117	+ * <pre> http://foo.com/hello world/ and http://foo.com/hello%20world</pre>
	118	+ * would be considered not equal to each other.
	119	+ * <p>
	120	+ * Note, the {@link java.net.URI} class does perform escaping of its
	121	+ * component fields in certain circumstances. The recommended way
	122	+ * to manage the encoding and decoding of URLs is to use {@link java.net.URI},
	123	+ * and to convert between these two classes using {@link #toURI()} and
	124	+ * {@link URI#toURL()}.
	125	+ * <p>
	126	+ * The {@link URLEncoder} and {@link URLDecoder} classes can also be
	127	+ * used, but only for HTML form encoding, which is not the same
	128	+ * as the encoding scheme defined in RFC2396.
	129	+ *
	130	+ * @author James Gosling
	131	+ * @since JDK1.0
	132	+ */
	133	+public final class URL implements java.io.Serializable {
	134	+
	135	+ static final long serialVersionUID = -7627629688361524110L;
	136	+
	137	+ /**
	138	+ * The property which specifies the package prefix list to be scanned
	139	+ * for protocol handlers. The value of this property (if any) should
	140	+ * be a vertical bar delimited list of package names to search through
	141	+ * for a protocol handler to load. The policy of this class is that
	142	+ * all protocol handlers will be in a class called <protocolname>.Handler,
	143	+ * and each package in the list is examined in turn for a matching
	144	+ * handler. If none are found (or the property is not specified), the
	145	+ * default package prefix, sun.net.www.protocol, is used. The search
	146	+ * proceeds from the first package in the list to the last and stops
	147	+ * when a match is found.
	148	+ */
	149	+ private static final String protocolPathProp = "java.protocol.handler.pkgs";
	150	+
	151	+ /**
	152	+ * The protocol to use (ftp, http, nntp, ... etc.) .
	153	+ * @serial
	154	+ */
	155	+ private String protocol;
	156	+
	157	+ /**
	158	+ * The host name to connect to.
	159	+ * @serial
	160	+ */
	161	+ private String host;
	162	+
	163	+ /**
	164	+ * The protocol port to connect to.
	165	+ * @serial
	166	+ */
	167	+ private int port = -1;
	168	+
	169	+ /**
	170	+ * The specified file name on that host. <code>file</code> is
	171	+ * defined as <code>path[?query]</code>
	172	+ * @serial
	173	+ */
	174	+ private String file;
	175	+
	176	+ /**
	177	+ * The query part of this URL.
	178	+ */
	179	+ private transient String query;
	180	+
	181	+ /**
	182	+ * The authority part of this URL.
	183	+ * @serial
	184	+ */
	185	+ private String authority;
	186	+
	187	+ /**
	188	+ * The path part of this URL.
	189	+ */
	190	+ private transient String path;
	191	+
	192	+ /**
	193	+ * The userinfo part of this URL.
	194	+ */
	195	+ private transient String userInfo;
	196	+
	197	+ /**
	198	+ * # reference.
	199	+ * @serial
	200	+ */
	201	+ private String ref;
	202	+
	203	+ /**
	204	+ * The host's IP address, used in equals and hashCode.
	205	+ * Computed on demand. An uninitialized or unknown hostAddress is null.
	206	+ */
	207	+ transient InetAddress hostAddress;
	208	+
	209	+ /**
	210	+ * The URLStreamHandler for this URL.
	211	+ */
	212	+ transient URLStreamHandler handler;
	213	+
	214	+ /* Our hash code.
	215	+ * @serial
	216	+ */
	217	+ private int hashCode = -1;
	218	+
	219	+ /**
	220	+ * Creates a <code>URL</code> object from the specified
	221	+ * <code>protocol</code>, <code>host</code>, <code>port</code>
	222	+ * number, and <code>file</code>.<p>
	223	+ *
	224	+ * <code>host</code> can be expressed as a host name or a literal
	225	+ * IP address. If IPv6 literal address is used, it should be
	226	+ * enclosed in square brackets (<tt>'['</tt> and <tt>']'</tt>), as
	227	+ * specified by <a
	228	+ * href="http://www.ietf.org/rfc/rfc2732.txt">RFC 2732</a>;
	229	+ * However, the literal IPv6 address format defined in <a
	230	+ * href="http://www.ietf.org/rfc/rfc2373.txt"><i>RFC 2373: IP
	231	+ * Version 6 Addressing Architecture</i></a> is also accepted.<p>
	232	+ *
	233	+ * Specifying a <code>port</code> number of <code>-1</code>
	234	+ * indicates that the URL should use the default port for the
	235	+ * protocol.<p>
	236	+ *
	237	+ * If this is the first URL object being created with the specified
	238	+ * protocol, a <i>stream protocol handler</i> object, an instance of
	239	+ * class <code>URLStreamHandler</code>, is created for that protocol:
	240	+ * <ol>
	241	+ * <li>If the application has previously set up an instance of
	242	+ * <code>URLStreamHandlerFactory</code> as the stream handler factory,
	243	+ * then the <code>createURLStreamHandler</code> method of that instance
	244	+ * is called with the protocol string as an argument to create the
	245	+ * stream protocol handler.
	246	+ * <li>If no <code>URLStreamHandlerFactory</code> has yet been set up,
	247	+ * or if the factory's <code>createURLStreamHandler</code> method
	248	+ * returns <code>null</code>, then the constructor finds the
	249	+ * value of the system property:
	250	+ * <blockquote><pre>
	251	+ * java.protocol.handler.pkgs
	252	+ * </pre></blockquote>
	253	+ * If the value of that system property is not <code>null</code>,
	254	+ * it is interpreted as a list of packages separated by a vertical
	255	+ * slash character '<code>\|</code>'. The constructor tries to load
	256	+ * the class named:
	257	+ * <blockquote><pre>
	258	+ * <<i>package</i>>.<<i>protocol</i>>.Handler
	259	+ * </pre></blockquote>
	260	+ * where <<i>package</i>> is replaced by the name of the package
	261	+ * and <<i>protocol</i>> is replaced by the name of the protocol.
	262	+ * If this class does not exist, or if the class exists but it is not
	263	+ * a subclass of <code>URLStreamHandler</code>, then the next package
	264	+ * in the list is tried.
	265	+ * <li>If the previous step fails to find a protocol handler, then the
	266	+ * constructor tries to load from a system default package.
	267	+ * <blockquote><pre>
	268	+ * <<i>system default package</i>>.<<i>protocol</i>>.Handler
	269	+ * </pre></blockquote>
	270	+ * If this class does not exist, or if the class exists but it is not a
	271	+ * subclass of <code>URLStreamHandler</code>, then a
	272	+ * <code>MalformedURLException</code> is thrown.
	273	+ * </ol>
	274	+ *
	275	+ * <p>Protocol handlers for the following protocols are guaranteed
	276	+ * to exist on the search path :-
	277	+ * <blockquote><pre>
	278	+ * http, https, ftp, file, and jar
	279	+ * </pre></blockquote>
	280	+ * Protocol handlers for additional protocols may also be
	281	+ * available.
	282	+ *
	283	+ * <p>No validation of the inputs is performed by this constructor.
	284	+ *
	285	+ * @param protocol the name of the protocol to use.
	286	+ * @param host the name of the host.
	287	+ * @param port the port number on the host.
	288	+ * @param file the file on the host
	289	+ * @exception MalformedURLException if an unknown protocol is specified.
	290	+ * @see java.lang.System#getProperty(java.lang.String)
	291	+ * @see java.net.URL#setURLStreamHandlerFactory(
	292	+ * java.net.URLStreamHandlerFactory)
	293	+ * @see java.net.URLStreamHandler
	294	+ * @see java.net.URLStreamHandlerFactory#createURLStreamHandler(
	295	+ * java.lang.String)
	296	+ */
	297	+ public URL(String protocol, String host, int port, String file)
	298	+ throws MalformedURLException
	299	+ {
	300	+ this(protocol, host, port, file, null);
	301	+ }
	302	+
	303	+ /**
	304	+ * Creates a URL from the specified <code>protocol</code>
	305	+ * name, <code>host</code> name, and <code>file</code> name. The
	306	+ * default port for the specified protocol is used.
	307	+ * <p>
	308	+ * This method is equivalent to calling the four-argument
	309	+ * constructor with the arguments being <code>protocol</code>,
	310	+ * <code>host</code>, <code>-1</code>, and <code>file</code>.
	311	+ *
	312	+ * No validation of the inputs is performed by this constructor.
	313	+ *
	314	+ * @param protocol the name of the protocol to use.
	315	+ * @param host the name of the host.
	316	+ * @param file the file on the host.
	317	+ * @exception MalformedURLException if an unknown protocol is specified.
	318	+ * @see java.net.URL#URL(java.lang.String, java.lang.String,
	319	+ * int, java.lang.String)
	320	+ */
	321	+ public URL(String protocol, String host, String file)
	322	+ throws MalformedURLException {
	323	+ this(protocol, host, -1, file);
	324	+ }
	325	+
	326	+ /**
	327	+ * Creates a <code>URL</code> object from the specified
	328	+ * <code>protocol</code>, <code>host</code>, <code>port</code>
	329	+ * number, <code>file</code>, and <code>handler</code>. Specifying
	330	+ * a <code>port</code> number of <code>-1</code> indicates that
	331	+ * the URL should use the default port for the protocol. Specifying
	332	+ * a <code>handler</code> of <code>null</code> indicates that the URL
	333	+ * should use a default stream handler for the protocol, as outlined
	334	+ * for:
	335	+ * java.net.URL#URL(java.lang.String, java.lang.String, int,
	336	+ * java.lang.String)
	337	+ *
	338	+ * <p>If the handler is not null and there is a security manager,
	339	+ * the security manager's <code>checkPermission</code>
	340	+ * method is called with a
	341	+ * <code>NetPermission("specifyStreamHandler")</code> permission.
	342	+ * This may result in a SecurityException.
	343	+ *
	344	+ * No validation of the inputs is performed by this constructor.
	345	+ *
	346	+ * @param protocol the name of the protocol to use.
	347	+ * @param host the name of the host.
	348	+ * @param port the port number on the host.
	349	+ * @param file the file on the host
	350	+ * @param handler the stream handler for the URL.
	351	+ * @exception MalformedURLException if an unknown protocol is specified.
	352	+ * @exception SecurityException
	353	+ * if a security manager exists and its
	354	+ * <code>checkPermission</code> method doesn't allow
	355	+ * specifying a stream handler explicitly.
	356	+ * @see java.lang.System#getProperty(java.lang.String)
	357	+ * @see java.net.URL#setURLStreamHandlerFactory(
	358	+ * java.net.URLStreamHandlerFactory)
	359	+ * @see java.net.URLStreamHandler
	360	+ * @see java.net.URLStreamHandlerFactory#createURLStreamHandler(
	361	+ * java.lang.String)
	362	+ * @see SecurityManager#checkPermission
	363	+ * @see java.net.NetPermission
	364	+ */
	365	+ public URL(String protocol, String host, int port, String file,
	366	+ URLStreamHandler handler) throws MalformedURLException {
	367	+ if (handler != null) {
	368	+ SecurityManager sm = System.getSecurityManager();
	369	+ if (sm != null) {
	370	+ // check for permission to specify a handler
	371	+ checkSpecifyHandler(sm);
	372	+ }
	373	+ }
	374	+
	375	+ protocol = protocol.toLowerCase();
	376	+ this.protocol = protocol;
	377	+ if (host != null) {
	378	+
	379	+ /**
	380	+ * if host is a literal IPv6 address,
	381	+ * we will make it conform to RFC 2732
	382	+ */
	383	+ if (host.indexOf(':') >= 0 && !host.startsWith("[")) {
	384	+ host = "["+host+"]";
	385	+ }
	386	+ this.host = host;
	387	+
	388	+ if (port < -1) {
	389	+ throw new MalformedURLException("Invalid port number :" +
	390	+ port);
	391	+ }
	392	+ this.port = port;
	393	+ authority = (port == -1) ? host : host + ":" + port;
	394	+ }
	395	+
	396	+ Parts parts = new Parts(file);
	397	+ path = parts.getPath();
	398	+ query = parts.getQuery();
	399	+
	400	+ if (query != null) {
	401	+ this.file = path + "?" + query;
	402	+ } else {
	403	+ this.file = path;
	404	+ }
	405	+ ref = parts.getRef();
	406	+
	407	+ // Note: we don't do validation of the URL here. Too risky to change
	408	+ // right now, but worth considering for future reference. -br
	409	+ if (handler == null &&
	410	+ (handler = getURLStreamHandler(protocol)) == null) {
	411	+ throw new MalformedURLException("unknown protocol: " + protocol);
	412	+ }
	413	+ this.handler = handler;
	414	+ }
	415	+
	416	+ /**
	417	+ * Creates a <code>URL</code> object from the <code>String</code>
	418	+ * representation.
	419	+ * <p>
	420	+ * This constructor is equivalent to a call to the two-argument
	421	+ * constructor with a <code>null</code> first argument.
	422	+ *
	423	+ * @param spec the <code>String</code> to parse as a URL.
	424	+ * @exception MalformedURLException if no protocol is specified, or an
	425	+ * unknown protocol is found, or <tt>spec</tt> is <tt>null</tt>.
	426	+ * @see java.net.URL#URL(java.net.URL, java.lang.String)
	427	+ */
	428	+ public URL(String spec) throws MalformedURLException {
	429	+ this(null, spec);
	430	+ }
	431	+
	432	+ /**
	433	+ * Creates a URL by parsing the given spec within a specified context.
	434	+ *
	435	+ * The new URL is created from the given context URL and the spec
	436	+ * argument as described in
	437	+ * RFC2396 "Uniform Resource Identifiers : Generic * Syntax" :
	438	+ * <blockquote><pre>
	439	+ * <scheme>://<authority><path>?<query>#<fragment>
	440	+ * </pre></blockquote>
	441	+ * The reference is parsed into the scheme, authority, path, query and
	442	+ * fragment parts. If the path component is empty and the scheme,
	443	+ * authority, and query components are undefined, then the new URL is a
	444	+ * reference to the current document. Otherwise, the fragment and query
	445	+ * parts present in the spec are used in the new URL.
	446	+ * <p>
	447	+ * If the scheme component is defined in the given spec and does not match
	448	+ * the scheme of the context, then the new URL is created as an absolute
	449	+ * URL based on the spec alone. Otherwise the scheme component is inherited
	450	+ * from the context URL.
	451	+ * <p>
	452	+ * If the authority component is present in the spec then the spec is
	453	+ * treated as absolute and the spec authority and path will replace the
	454	+ * context authority and path. If the authority component is absent in the
	455	+ * spec then the authority of the new URL will be inherited from the
	456	+ * context.
	457	+ * <p>
	458	+ * If the spec's path component begins with a slash character
	459	+ * "/" then the
	460	+ * path is treated as absolute and the spec path replaces the context path.
	461	+ * <p>
	462	+ * Otherwise, the path is treated as a relative path and is appended to the
	463	+ * context path, as described in RFC2396. Also, in this case,
	464	+ * the path is canonicalized through the removal of directory
	465	+ * changes made by occurences of ".." and ".".
	466	+ * <p>
	467	+ * For a more detailed description of URL parsing, refer to RFC2396.
	468	+ *
	469	+ * @param context the context in which to parse the specification.
	470	+ * @param spec the <code>String</code> to parse as a URL.
	471	+ * @exception MalformedURLException if no protocol is specified, or an
	472	+ * unknown protocol is found, or <tt>spec</tt> is <tt>null</tt>.
	473	+ * @see java.net.URL#URL(java.lang.String, java.lang.String,
	474	+ * int, java.lang.String)
	475	+ * @see java.net.URLStreamHandler
	476	+ * @see java.net.URLStreamHandler#parseURL(java.net.URL,
	477	+ * java.lang.String, int, int)
	478	+ */
	479	+ public URL(URL context, String spec) throws MalformedURLException {
	480	+ this(context, spec, null);
	481	+ }
	482	+
	483	+ /**
	484	+ * Creates a URL by parsing the given spec with the specified handler
	485	+ * within a specified context. If the handler is null, the parsing
	486	+ * occurs as with the two argument constructor.
	487	+ *
	488	+ * @param context the context in which to parse the specification.
	489	+ * @param spec the <code>String</code> to parse as a URL.
	490	+ * @param handler the stream handler for the URL.
	491	+ * @exception MalformedURLException if no protocol is specified, or an
	492	+ * unknown protocol is found, or <tt>spec</tt> is <tt>null</tt>.
	493	+ * @exception SecurityException
	494	+ * if a security manager exists and its
	495	+ * <code>checkPermission</code> method doesn't allow
	496	+ * specifying a stream handler.
	497	+ * @see java.net.URL#URL(java.lang.String, java.lang.String,
	498	+ * int, java.lang.String)
	499	+ * @see java.net.URLStreamHandler
	500	+ * @see java.net.URLStreamHandler#parseURL(java.net.URL,
	501	+ * java.lang.String, int, int)
	502	+ */
	503	+ public URL(URL context, String spec, URLStreamHandler handler)
	504	+ throws MalformedURLException
	505	+ {
	506	+ String original = spec;
	507	+ int i, limit, c;
	508	+ int start = 0;
	509	+ String newProtocol = null;
	510	+ boolean aRef=false;
	511	+ boolean isRelative = false;
	512	+
	513	+ // Check for permission to specify a handler
	514	+ if (handler != null) {
	515	+ SecurityManager sm = System.getSecurityManager();
	516	+ if (sm != null) {
	517	+ checkSpecifyHandler(sm);
	518	+ }
	519	+ }
	520	+
	521	+ try {
	522	+ limit = spec.length();
	523	+ while ((limit > 0) && (spec.charAt(limit - 1) <= ' ')) {
	524	+ limit--; //eliminate trailing whitespace
	525	+ }
	526	+ while ((start < limit) && (spec.charAt(start) <= ' ')) {
	527	+ start++; // eliminate leading whitespace
	528	+ }
	529	+
	530	+ if (spec.regionMatches(true, start, "url:", 0, 4)) {
	531	+ start += 4;
	532	+ }
	533	+ if (start < spec.length() && spec.charAt(start) == '#') {
	534	+ /* we're assuming this is a ref relative to the context URL.
	535	+ * This means protocols cannot start w/ '#', but we must parse
	536	+ * ref URL's like: "hello:there" w/ a ':' in them.
	537	+ */
	538	+ aRef=true;
	539	+ }
	540	+ for (i = start ; !aRef && (i < limit) &&
	541	+ ((c = spec.charAt(i)) != '/') ; i++) {
	542	+ if (c == ':') {
	543	+
	544	+ String s = spec.substring(start, i).toLowerCase();
	545	+ if (isValidProtocol(s)) {
	546	+ newProtocol = s;
	547	+ start = i + 1;
	548	+ }
	549	+ break;
	550	+ }
	551	+ }
	552	+
	553	+ // Only use our context if the protocols match.
	554	+ protocol = newProtocol;
	555	+ if ((context != null) && ((newProtocol == null) \|\|
	556	+ newProtocol.equalsIgnoreCase(context.protocol))) {
	557	+ // inherit the protocol handler from the context
	558	+ // if not specified to the constructor
	559	+ if (handler == null) {
	560	+ handler = context.handler;
	561	+ }
	562	+
	563	+ // If the context is a hierarchical URL scheme and the spec
	564	+ // contains a matching scheme then maintain backwards
	565	+ // compatibility and treat it as if the spec didn't contain
	566	+ // the scheme; see 5.2.3 of RFC2396
	567	+ if (context.path != null && context.path.startsWith("/"))
	568	+ newProtocol = null;
	569	+
	570	+ if (newProtocol == null) {
	571	+ protocol = context.protocol;
	572	+ authority = context.authority;
	573	+ userInfo = context.userInfo;
	574	+ host = context.host;
	575	+ port = context.port;
	576	+ file = context.file;
	577	+ path = context.path;
	578	+ isRelative = true;
	579	+ }
	580	+ }
	581	+
	582	+ if (protocol == null) {
	583	+ throw new MalformedURLException("no protocol: "+original);
	584	+ }
	585	+
	586	+ // Get the protocol handler if not specified or the protocol
	587	+ // of the context could not be used
	588	+ if (handler == null &&
	589	+ (handler = getURLStreamHandler(protocol)) == null) {
	590	+ throw new MalformedURLException("unknown protocol: "+protocol);
	591	+ }
	592	+
	593	+ this.handler = handler;
	594	+
	595	+ i = spec.indexOf('#', start);
	596	+ if (i >= 0) {
	597	+ ref = spec.substring(i + 1, limit);
	598	+ limit = i;
	599	+ }
	600	+
	601	+ /*
	602	+ * Handle special case inheritance of query and fragment
	603	+ * implied by RFC2396 section 5.2.2.
	604	+ */
	605	+ if (isRelative && start == limit) {
	606	+ query = context.query;
	607	+ if (ref == null) {
	608	+ ref = context.ref;
	609	+ }
	610	+ }
	611	+
	612	+ handler.parseURL(this, spec, start, limit);
	613	+
	614	+ } catch(MalformedURLException e) {
	615	+ throw e;
	616	+ } catch(Exception e) {
	617	+ MalformedURLException exception = new MalformedURLException(e.getMessage());
	618	+ exception.initCause(e);
	619	+ throw exception;
	620	+ }
	621	+ }
	622	+
	623	+ /*
	624	+ * Returns true if specified string is a valid protocol name.
	625	+ */
	626	+ private boolean isValidProtocol(String protocol) {
	627	+ int len = protocol.length();
	628	+ if (len < 1)
	629	+ return false;
	630	+ char c = protocol.charAt(0);
	631	+ if (!Character.isLetter(c))
	632	+ return false;
	633	+ for (int i = 1; i < len; i++) {
	634	+ c = protocol.charAt(i);
	635	+ if (!Character.isLetterOrDigit(c) && c != '.' && c != '+' &&
	636	+ c != '-') {
	637	+ return false;
	638	+ }
	639	+ }
	640	+ return true;
	641	+ }
	642	+
	643	+ /*
	644	+ * Checks for permission to specify a stream handler.
	645	+ */
	646	+ private void checkSpecifyHandler(SecurityManager sm) {
	647	+ sm.checkPermission(SecurityConstants.SPECIFY_HANDLER_PERMISSION);
	648	+ }
	649	+
	650	+ /**
	651	+ * Sets the fields of the URL. This is not a public method so that
	652	+ * only URLStreamHandlers can modify URL fields. URLs are
	653	+ * otherwise constant.
	654	+ *
	655	+ * @param protocol the name of the protocol to use
	656	+ * @param host the name of the host
	657	+ @param port the port number on the host
	658	+ * @param file the file on the host
	659	+ * @param ref the internal reference in the URL
	660	+ */
	661	+ protected void set(String protocol, String host,
	662	+ int port, String file, String ref) {
	663	+ synchronized (this) {
	664	+ this.protocol = protocol;
	665	+ this.host = host;
	666	+ authority = port == -1 ? host : host + ":" + port;
	667	+ this.port = port;
	668	+ this.file = file;
	669	+ this.ref = ref;
	670	+ /* This is very important. We must recompute this after the
	671	+ * URL has been changed. */
	672	+ hashCode = -1;
	673	+ hostAddress = null;
	674	+ int q = file.lastIndexOf('?');
	675	+ if (q != -1) {
	676	+ query = file.substring(q+1);
	677	+ path = file.substring(0, q);
	678	+ } else
	679	+ path = file;
	680	+ }
	681	+ }
	682	+
	683	+ /**
	684	+ * Sets the specified 8 fields of the URL. This is not a public method so
	685	+ * that only URLStreamHandlers can modify URL fields. URLs are otherwise
	686	+ * constant.
	687	+ *
	688	+ * @param protocol the name of the protocol to use
	689	+ * @param host the name of the host
	690	+ * @param port the port number on the host
	691	+ * @param authority the authority part for the url
	692	+ * @param userInfo the username and password
	693	+ * @param path the file on the host
	694	+ * @param ref the internal reference in the URL
	695	+ * @param query the query part of this URL
	696	+ * @since 1.3
	697	+ */
	698	+ protected void set(String protocol, String host, int port,
	699	+ String authority, String userInfo, String path,
	700	+ String query, String ref) {
	701	+ synchronized (this) {
	702	+ this.protocol = protocol;
	703	+ this.host = host;
	704	+ this.port = port;
	705	+ this.file = query == null ? path : path + "?" + query;
	706	+ this.userInfo = userInfo;
	707	+ this.path = path;
	708	+ this.ref = ref;
	709	+ /* This is very important. We must recompute this after the
	710	+ * URL has been changed. */
	711	+ hashCode = -1;
	712	+ hostAddress = null;
	713	+ this.query = query;
	714	+ this.authority = authority;
	715	+ }
	716	+ }
	717	+
	718	+ /**
	719	+ * Gets the query part of this <code>URL</code>.
	720	+ *
	721	+ * @return the query part of this <code>URL</code>,
	722	+ * or <CODE>null</CODE> if one does not exist
	723	+ * @since 1.3
	724	+ */
	725	+ public String getQuery() {
	726	+ return query;
	727	+ }
	728	+
	729	+ /**
	730	+ * Gets the path part of this <code>URL</code>.
	731	+ *
	732	+ * @return the path part of this <code>URL</code>, or an
	733	+ * empty string if one does not exist
	734	+ * @since 1.3
	735	+ */
	736	+ public String getPath() {
	737	+ return path;
	738	+ }
	739	+
	740	+ /**
	741	+ * Gets the userInfo part of this <code>URL</code>.
	742	+ *
	743	+ * @return the userInfo part of this <code>URL</code>, or
	744	+ * <CODE>null</CODE> if one does not exist
	745	+ * @since 1.3
	746	+ */
	747	+ public String getUserInfo() {
	748	+ return userInfo;
	749	+ }
	750	+
	751	+ /**
	752	+ * Gets the authority part of this <code>URL</code>.
	753	+ *
	754	+ * @return the authority part of this <code>URL</code>
	755	+ * @since 1.3
	756	+ */
	757	+ public String getAuthority() {
	758	+ return authority;
	759	+ }
	760	+
	761	+ /**
	762	+ * Gets the port number of this <code>URL</code>.
	763	+ *
	764	+ * @return the port number, or -1 if the port is not set
	765	+ */
	766	+ public int getPort() {
	767	+ return port;
	768	+ }
	769	+
	770	+ /**
	771	+ * Gets the default port number of the protocol associated
	772	+ * with this <code>URL</code>. If the URL scheme or the URLStreamHandler
	773	+ * for the URL do not define a default port number,
	774	+ * then -1 is returned.
	775	+ *
	776	+ * @return the port number
	777	+ * @since 1.4
	778	+ */
	779	+ public int getDefaultPort() {
	780	+ return handler.getDefaultPort();
	781	+ }
	782	+
	783	+ /**
	784	+ * Gets the protocol name of this <code>URL</code>.
	785	+ *
	786	+ * @return the protocol of this <code>URL</code>.
	787	+ */
	788	+ public String getProtocol() {
	789	+ return protocol;
	790	+ }
	791	+
	792	+ /**
	793	+ * Gets the host name of this <code>URL</code>, if applicable.
	794	+ * The format of the host conforms to RFC 2732, i.e. for a
	795	+ * literal IPv6 address, this method will return the IPv6 address
	796	+ * enclosed in square brackets (<tt>'['</tt> and <tt>']'</tt>).
	797	+ *
	798	+ * @return the host name of this <code>URL</code>.
	799	+ */
	800	+ public String getHost() {
	801	+ return host;
	802	+ }
	803	+
	804	+ /**
	805	+ * Gets the file name of this <code>URL</code>.
	806	+ * The returned file portion will be
	807	+ * the same as <CODE>getPath()</CODE>, plus the concatenation of
	808	+ * the value of <CODE>getQuery()</CODE>, if any. If there is
	809	+ * no query portion, this method and <CODE>getPath()</CODE> will
	810	+ * return identical results.
	811	+ *
	812	+ * @return the file name of this <code>URL</code>,
	813	+ * or an empty string if one does not exist
	814	+ */
	815	+ public String getFile() {
	816	+ return file;
	817	+ }
	818	+
	819	+ /**
	820	+ * Gets the anchor (also known as the "reference") of this
	821	+ * <code>URL</code>.
	822	+ *
	823	+ * @return the anchor (also known as the "reference") of this
	824	+ * <code>URL</code>, or <CODE>null</CODE> if one does not exist
	825	+ */
	826	+ public String getRef() {
	827	+ return ref;
	828	+ }
	829	+
	830	+ /**
	831	+ * Compares this URL for equality with another object.<p>
	832	+ *
	833	+ * If the given object is not a URL then this method immediately returns
	834	+ * <code>false</code>.<p>
	835	+ *
	836	+ * Two URL objects are equal if they have the same protocol, reference
	837	+ * equivalent hosts, have the same port number on the host, and the same
	838	+ * file and fragment of the file.<p>
	839	+ *
	840	+ * Two hosts are considered equivalent if both host names can be resolved
	841	+ * into the same IP addresses; else if either host name can't be
	842	+ * resolved, the host names must be equal without regard to case; or both
	843	+ * host names equal to null.<p>
	844	+ *
	845	+ * Since hosts comparison requires name resolution, this operation is a
	846	+ * blocking operation. <p>
	847	+ *
	848	+ * Note: The defined behavior for <code>equals</code> is known to
	849	+ * be inconsistent with virtual hosting in HTTP.
	850	+ *
	851	+ * @param obj the URL to compare against.
	852	+ * @return <code>true</code> if the objects are the same;
	853	+ * <code>false</code> otherwise.
	854	+ */
	855	+ public boolean equals(Object obj) {
	856	+ if (!(obj instanceof URL))
	857	+ return false;
	858	+ URL u2 = (URL)obj;
	859	+
	860	+ return handler.equals(this, u2);
	861	+ }
	862	+
	863	+ /**
	864	+ * Creates an integer suitable for hash table indexing.<p>
	865	+ *
	866	+ * The hash code is based upon all the URL components relevant for URL
	867	+ * comparison. As such, this operation is a blocking operation.<p>
	868	+ *
	869	+ * @return a hash code for this <code>URL</code>.
	870	+ */
	871	+ public synchronized int hashCode() {
	872	+ if (hashCode != -1)
	873	+ return hashCode;
	874	+
	875	+ hashCode = handler.hashCode(this);
	876	+ return hashCode;
	877	+ }
	878	+
	879	+ /**
	880	+ * Compares two URLs, excluding the fragment component.<p>
	881	+ *
	882	+ * Returns <code>true</code> if this <code>URL</code> and the
	883	+ * <code>other</code> argument are equal without taking the
	884	+ * fragment component into consideration.
	885	+ *
	886	+ * @param other the <code>URL</code> to compare against.
	887	+ * @return <code>true</code> if they reference the same remote object;
	888	+ * <code>false</code> otherwise.
	889	+ */
	890	+ public boolean sameFile(URL other) {
	891	+ return handler.sameFile(this, other);
	892	+ }
	893	+
	894	+ /**
	895	+ * Constructs a string representation of this <code>URL</code>. The
	896	+ * string is created by calling the <code>toExternalForm</code>
	897	+ * method of the stream protocol handler for this object.
	898	+ *
	899	+ * @return a string representation of this object.
	900	+ * @see java.net.URL#URL(java.lang.String, java.lang.String, int,
	901	+ * java.lang.String)
	902	+ * @see java.net.URLStreamHandler#toExternalForm(java.net.URL)
	903	+ */
	904	+ public String toString() {
	905	+ return toExternalForm();
	906	+ }
	907	+
	908	+ /**
	909	+ * Constructs a string representation of this <code>URL</code>. The
	910	+ * string is created by calling the <code>toExternalForm</code>
	911	+ * method of the stream protocol handler for this object.
	912	+ *
	913	+ * @return a string representation of this object.
	914	+ * @see java.net.URL#URL(java.lang.String, java.lang.String,
	915	+ * int, java.lang.String)
	916	+ * @see java.net.URLStreamHandler#toExternalForm(java.net.URL)
	917	+ */
	918	+ public String toExternalForm() {
	919	+ return handler.toExternalForm(this);
	920	+ }
	921	+
	922	+ /**
	923	+ * Returns a {@link java.net.URI} equivalent to this URL.
	924	+ * This method functions in the same way as <code>new URI (this.toString())</code>.
	925	+ * <p>Note, any URL instance that complies with RFC 2396 can be converted
	926	+ * to a URI. However, some URLs that are not strictly in compliance
	927	+ * can not be converted to a URI.
	928	+ *
	929	+ * @exception URISyntaxException if this URL is not formatted strictly according to
	930	+ * to RFC2396 and cannot be converted to a URI.
	931	+ *
	932	+ * @return a URI instance equivalent to this URL.
	933	+ * @since 1.5
	934	+ */
	935	+ public URI toURI() throws URISyntaxException {
	936	+ return new URI (toString());
	937	+ }
	938	+
	939	+ /**
	940	+ * Returns a {@link java.net.URLConnection URLConnection} instance that
	941	+ * represents a connection to the remote object referred to by the
	942	+ * {@code URL}.
	943	+ *
	944	+ * <P>A new instance of {@linkplain java.net.URLConnection URLConnection} is
	945	+ * created every time when invoking the
	946	+ * {@linkplain java.net.URLStreamHandler#openConnection(URL)
	947	+ * URLStreamHandler.openConnection(URL)} method of the protocol handler for
	948	+ * this URL.</P>
	949	+ *
	950	+ * <P>It should be noted that a URLConnection instance does not establish
	951	+ * the actual network connection on creation. This will happen only when
	952	+ * calling {@linkplain java.net.URLConnection#connect() URLConnection.connect()}.</P>
	953	+ *
	954	+ * <P>If for the URL's protocol (such as HTTP or JAR), there
	955	+ * exists a public, specialized URLConnection subclass belonging
	956	+ * to one of the following packages or one of their subpackages:
	957	+ * java.lang, java.io, java.util, java.net, the connection
	958	+ * returned will be of that subclass. For example, for HTTP an
	959	+ * HttpURLConnection will be returned, and for JAR a
	960	+ * JarURLConnection will be returned.</P>
	961	+ *
	962	+ * @return a {@link java.net.URLConnection URLConnection} linking
	963	+ * to the URL.
	964	+ * @exception IOException if an I/O exception occurs.
	965	+ * @see java.net.URL#URL(java.lang.String, java.lang.String,
	966	+ * int, java.lang.String)
	967	+ */
	968	+ public URLConnection openConnection() throws java.io.IOException {
	969	+ return handler.openConnection(this);
	970	+ }
	971	+
	972	+ /**
	973	+ * Same as {@link #openConnection()}, except that the connection will be
	974	+ * made through the specified proxy; Protocol handlers that do not
	975	+ * support proxing will ignore the proxy parameter and make a
	976	+ * normal connection.
	977	+ *
	978	+ * Invoking this method preempts the system's default ProxySelector
	979	+ * settings.
	980	+ *
	981	+ * @param proxy the Proxy through which this connection
	982	+ * will be made. If direct connection is desired,
	983	+ * Proxy.NO_PROXY should be specified.
	984	+ * @return a <code>URLConnection</code> to the URL.
	985	+ * @exception IOException if an I/O exception occurs.
	986	+ * @exception SecurityException if a security manager is present
	987	+ * and the caller doesn't have permission to connect
	988	+ * to the proxy.
	989	+ * @exception IllegalArgumentException will be thrown if proxy is null,
	990	+ * or proxy has the wrong type
	991	+ * @exception UnsupportedOperationException if the subclass that
	992	+ * implements the protocol handler doesn't support
	993	+ * this method.
	994	+ * @see java.net.URL#URL(java.lang.String, java.lang.String,
	995	+ * int, java.lang.String)
	996	+ * @see java.net.URLConnection
	997	+ * @see java.net.URLStreamHandler#openConnection(java.net.URL,
	998	+ * java.net.Proxy)
	999	+ * @since 1.5
	1000	+ */
	1001	+ public URLConnection openConnection(Proxy proxy)
	1002	+ throws java.io.IOException {
	1003	+ if (proxy == null) {
	1004	+ throw new IllegalArgumentException("proxy can not be null");
	1005	+ }
	1006	+
	1007	+ // Create a copy of Proxy as a security measure
	1008	+ Proxy p = proxy == Proxy.NO_PROXY ? Proxy.NO_PROXY : sun.net.ApplicationProxy.create(proxy);
	1009	+ SecurityManager sm = System.getSecurityManager();
	1010	+ if (p.type() != Proxy.Type.DIRECT && sm != null) {
	1011	+ InetSocketAddress epoint = (InetSocketAddress) p.address();
	1012	+ if (epoint.isUnresolved())
	1013	+ sm.checkConnect(epoint.getHostName(), epoint.getPort());
	1014	+ else
	1015	+ sm.checkConnect(epoint.getAddress().getHostAddress(),
	1016	+ epoint.getPort());
	1017	+ }
	1018	+ return handler.openConnection(this, p);
	1019	+ }
	1020	+
	1021	+ /**
	1022	+ * Opens a connection to this <code>URL</code> and returns an
	1023	+ * <code>InputStream</code> for reading from that connection. This
	1024	+ * method is a shorthand for:
	1025	+ * <blockquote><pre>
	1026	+ * openConnection().getInputStream()
	1027	+ * </pre></blockquote>
	1028	+ *
	1029	+ * @return an input stream for reading from the URL connection.
	1030	+ * @exception IOException if an I/O exception occurs.
	1031	+ * @see java.net.URL#openConnection()
	1032	+ * @see java.net.URLConnection#getInputStream()
	1033	+ */
	1034	+ public final InputStream openStream() throws java.io.IOException {
	1035	+ return openConnection().getInputStream();
	1036	+ }
	1037	+
	1038	+ /**
	1039	+ * Gets the contents of this URL. This method is a shorthand for:
	1040	+ * <blockquote><pre>
	1041	+ * openConnection().getContent()
	1042	+ * </pre></blockquote>
	1043	+ *
	1044	+ * @return the contents of this URL.
	1045	+ * @exception IOException if an I/O exception occurs.
	1046	+ * @see java.net.URLConnection#getContent()
	1047	+ */
	1048	+ public final Object getContent() throws java.io.IOException {
	1049	+ return openConnection().getContent();
	1050	+ }
	1051	+
	1052	+ /**
	1053	+ * Gets the contents of this URL. This method is a shorthand for:
	1054	+ * <blockquote><pre>
	1055	+ * openConnection().getContent(Class[])
	1056	+ * </pre></blockquote>
	1057	+ *
	1058	+ * @param classes an array of Java types
	1059	+ * @return the content object of this URL that is the first match of
	1060	+ * the types specified in the classes array.
	1061	+ * null if none of the requested types are supported.
	1062	+ * @exception IOException if an I/O exception occurs.
	1063	+ * @see java.net.URLConnection#getContent(Class[])
	1064	+ * @since 1.3
	1065	+ */
	1066	+ public final Object getContent(Class[] classes)
	1067	+ throws java.io.IOException {
	1068	+ return openConnection().getContent(classes);
	1069	+ }
	1070	+
	1071	+ /**
	1072	+ * The URLStreamHandler factory.
	1073	+ */
	1074	+ static URLStreamHandlerFactory factory;
	1075	+
	1076	+ /**
	1077	+ * Sets an application's <code>URLStreamHandlerFactory</code>.
	1078	+ * This method can be called at most once in a given Java Virtual
	1079	+ * Machine.
	1080	+ *
	1081	+ *<p> The <code>URLStreamHandlerFactory</code> instance is used to
	1082	+ *construct a stream protocol handler from a protocol name.
	1083	+ *
	1084	+ * <p> If there is a security manager, this method first calls
	1085	+ * the security manager's <code>checkSetFactory</code> method
	1086	+ * to ensure the operation is allowed.
	1087	+ * This could result in a SecurityException.
	1088	+ *
	1089	+ * @param fac the desired factory.
	1090	+ * @exception Error if the application has already set a factory.
	1091	+ * @exception SecurityException if a security manager exists and its
	1092	+ * <code>checkSetFactory</code> method doesn't allow
	1093	+ * the operation.
	1094	+ * @see java.net.URL#URL(java.lang.String, java.lang.String,
	1095	+ * int, java.lang.String)
	1096	+ * @see java.net.URLStreamHandlerFactory
	1097	+ * @see SecurityManager#checkSetFactory
	1098	+ */
	1099	+ public static void setURLStreamHandlerFactory(URLStreamHandlerFactory fac) {
	1100	+ synchronized (streamHandlerLock) {
	1101	+ if (factory != null) {
	1102	+ throw new Error("factory already defined");
	1103	+ }
	1104	+ SecurityManager security = System.getSecurityManager();
	1105	+ if (security != null) {
	1106	+ security.checkSetFactory();
	1107	+ }
	1108	+ handlers.clear();
	1109	+ factory = fac;
	1110	+ }
	1111	+ }
	1112	+
	1113	+ /**
	1114	+ * A table of protocol handlers.
	1115	+ */
	1116	+ static Hashtable handlers = new Hashtable();
	1117	+ private static Object streamHandlerLock = new Object();
	1118	+
	1119	+ /**
	1120	+ * Returns the Stream Handler.
	1121	+ * @param protocol the protocol to use
	1122	+ */
	1123	+ static URLStreamHandler getURLStreamHandler(String protocol) {
	1124	+
	1125	+ URLStreamHandler handler = (URLStreamHandler)handlers.get(protocol);
	1126	+ if (handler == null) {
	1127	+
	1128	+ boolean checkedWithFactory = false;
	1129	+
	1130	+ // Use the factory (if any)
	1131	+ if (factory != null) {
	1132	+ handler = factory.createURLStreamHandler(protocol);
	1133	+ checkedWithFactory = true;
	1134	+ }
	1135	+
	1136	+ // Try java protocol handler
	1137	+ if (handler == null) {
	1138	+ String packagePrefixList = null;
	1139	+
	1140	+ packagePrefixList
	1141	+ = java.security.AccessController.doPrivileged(
	1142	+ new sun.security.action.GetPropertyAction(
	1143	+ protocolPathProp,""));
	1144	+ if (packagePrefixList != "") {
	1145	+ packagePrefixList += "\|";
	1146	+ }
	1147	+
	1148	+ // REMIND: decide whether to allow the "null" class prefix
	1149	+ // or not.
	1150	+ packagePrefixList += "sun.net.www.protocol";
	1151	+
	1152	+ StringTokenizer packagePrefixIter =
	1153	+ new StringTokenizer(packagePrefixList, "\|");
	1154	+
	1155	+ while (handler == null &&
	1156	+ packagePrefixIter.hasMoreTokens()) {
	1157	+
	1158	+ String packagePrefix =
	1159	+ packagePrefixIter.nextToken().trim();
	1160	+ try {
	1161	+ String clsName = packagePrefix + "." + protocol +
	1162	+ ".Handler";
	1163	+ Class cls = null;
	1164	+ try {
	1165	+ cls = Class.forName(clsName);
	1166	+ } catch (ClassNotFoundException e) {
	1167	+ ClassLoader cl = ClassLoader.getSystemClassLoader();
	1168	+ if (cl != null) {
	1169	+ cls = cl.loadClass(clsName);
	1170	+ }
	1171	+ }
	1172	+ if (cls != null) {
	1173	+ handler =
	1174	+ (URLStreamHandler)cls.newInstance();
	1175	+ }
	1176	+ } catch (Exception e) {
	1177	+ // any number of exceptions can get thrown here
	1178	+ }
	1179	+ }
	1180	+ }
	1181	+
	1182	+ synchronized (streamHandlerLock) {
	1183	+
	1184	+ URLStreamHandler handler2 = null;
	1185	+
	1186	+ // Check again with hashtable just in case another
	1187	+ // thread created a handler since we last checked
	1188	+ handler2 = (URLStreamHandler)handlers.get(protocol);
	1189	+
	1190	+ if (handler2 != null) {
	1191	+ return handler2;
	1192	+ }
	1193	+
	1194	+ // Check with factory if another thread set a
	1195	+ // factory since our last check
	1196	+ if (!checkedWithFactory && factory != null) {
	1197	+ handler2 = factory.createURLStreamHandler(protocol);
	1198	+ }
	1199	+
	1200	+ if (handler2 != null) {
	1201	+ // The handler from the factory must be given more
	1202	+ // importance. Discard the default handler that
	1203	+ // this thread created.
	1204	+ handler = handler2;
	1205	+ }
	1206	+
	1207	+ // Insert this handler into the hashtable
	1208	+ if (handler != null) {
	1209	+ handlers.put(protocol, handler);
	1210	+ }
	1211	+
	1212	+ }
	1213	+ }
	1214	+
	1215	+ return handler;
	1216	+
	1217	+ }
	1218	+
	1219	+ /**
	1220	+ * WriteObject is called to save the state of the URL to an
	1221	+ * ObjectOutputStream. The handler is not saved since it is
	1222	+ * specific to this system.
	1223	+ *
	1224	+ * @serialData the default write object value. When read back in,
	1225	+ * the reader must ensure that calling getURLStreamHandler with
	1226	+ * the protocol variable returns a valid URLStreamHandler and
	1227	+ * throw an IOException if it does not.
	1228	+ */
	1229	+ private synchronized void writeObject(java.io.ObjectOutputStream s)
	1230	+ throws IOException
	1231	+ {
	1232	+ s.defaultWriteObject(); // write the fields
	1233	+ }
	1234	+
	1235	+ /**
	1236	+ * readObject is called to restore the state of the URL from the
	1237	+ * stream. It reads the components of the URL and finds the local
	1238	+ * stream handler.
	1239	+ */
	1240	+ private synchronized void readObject(java.io.ObjectInputStream s)
	1241	+ throws IOException, ClassNotFoundException
	1242	+ {
	1243	+ s.defaultReadObject(); // read the fields
	1244	+ if ((handler = getURLStreamHandler(protocol)) == null) {
	1245	+ throw new IOException("unknown protocol: " + protocol);
	1246	+ }
	1247	+
	1248	+ // Construct authority part
	1249	+ if (authority == null &&
	1250	+ ((host != null && host.length() > 0) \|\| port != -1)) {
	1251	+ if (host == null)
	1252	+ host = "";
	1253	+ authority = (port == -1) ? host : host + ":" + port;
	1254	+
	1255	+ // Handle hosts with userInfo in them
	1256	+ int at = host.lastIndexOf('@');
	1257	+ if (at != -1) {
	1258	+ userInfo = host.substring(0, at);
	1259	+ host = host.substring(at+1);
	1260	+ }
	1261	+ } else if (authority != null) {
	1262	+ // Construct user info part
	1263	+ int ind = authority.indexOf('@');
	1264	+ if (ind != -1)
	1265	+ userInfo = authority.substring(0, ind);
	1266	+ }
	1267	+
	1268	+ // Construct path and query part
	1269	+ path = null;
	1270	+ query = null;
	1271	+ if (file != null) {
	1272	+ // Fix: only do this if hierarchical?
	1273	+ int q = file.lastIndexOf('?');
	1274	+ if (q != -1) {
	1275	+ query = file.substring(q+1);
	1276	+ path = file.substring(0, q);
	1277	+ } else
	1278	+ path = file;
	1279	+ }
	1280	+ }
	1281	+}
	1282	+
	1283	+class Parts {
	1284	+ String path, query, ref;
	1285	+
	1286	+ Parts(String file) {
	1287	+ int ind = file.indexOf('#');
	1288	+ ref = ind < 0 ? null: file.substring(ind + 1);
	1289	+ file = ind < 0 ? file: file.substring(0, ind);
	1290	+ int q = file.lastIndexOf('?');
	1291	+ if (q != -1) {
	1292	+ query = file.substring(q+1);
	1293	+ path = file.substring(0, q);
	1294	+ } else {
	1295	+ path = file;
	1296	+ }
	1297	+ }
	1298	+
	1299	+ String getPath() {
	1300	+ return path;
	1301	+ }
	1302	+
	1303	+ String getQuery() {
	1304	+ return query;
	1305	+ }
	1306	+
	1307	+ String getRef() {
	1308	+ return ref;
	1309	+ }
	1310	+}