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URL.java
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URL.java
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/*
* Some portions of this file have been modified by Robert Hanson hansonr.at.stolaf.edu 2012-2017
* for use in SwingJS via transpilation into JavaScript using Java2Script.
*
* Copyright 1995-2007 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.
*/
// source: http://grepcode.com/file_/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/net/URL.java/?v=source
package java.net;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Hashtable;
import javajs.util.AjaxURLConnection;
import javajs.util.AjaxURLStreamHandlerFactory;
/**
* Class <code>URL</code> represents a Uniform Resource Locator, a pointer to a
* "resource" on the World Wide Web. A resource can be something as simple as a
* file or a directory, or it can be a reference to a more complicated object,
* such as a query to a database or to a search engine. More information on the
* types of URLs and their formats can be found at: <blockquote> <a
* href="http://www.socs.uts.edu.au/MosaicDocs-old/url-primer.html">
* <i>http://www.socs.uts.edu.au/MosaicDocs-old/url-primer.html</i></a>
* </blockquote>
* <p>
* In general, a URL can be broken into several parts. The previous example of a
* URL indicates that the protocol to use is <code>http</code> (HyperText
* Transfer Protocol) and that the information resides on a host machine named
* <code>www.socs.uts.edu.au</code>. The information on that host machine is
* named <code>/MosaicDocs-old/url-primer.html</code>. The exact meaning of this
* name on the host machine is both protocol dependent and host dependent. The
* information normally resides in a file, but it could be generated on the fly.
* This component of the URL is called the <i>path</i> component.
* <p>
* A URL can optionally specify a "port", which is the port number to which the
* TCP connection is made on the remote host machine. If the port is not
* specified, the default port for the protocol is used instead. For example,
* the default port for <code>http</code> is <code>80</code>. An alternative
* port could be specified as: <blockquote>
*
* <pre>
* http://www.socs.uts.edu.au:80/MosaicDocs-old/url-primer.html
* </pre>
*
* </blockquote>
* <p>
* The syntax of <code>URL</code> is defined by <a
* href="http://www.ietf.org/rfc/rfc2396.txt""><i>RFC 2396: Uniform
* Resource Identifiers (URI): Generic Syntax</i></a>, amended by <a
* href="http://www.ietf.org/rfc/rfc2732.txt"><i>RFC 2732: Format for
* Literal IPv6 Addresses in URLs</i></a>. The Literal IPv6 address format also
* supports scope_ids. The syntax and usage of scope_ids is described <a
* href="Inet6Address.html#scoped">here</a>.
* <p>
* A URL may have appended to it a "fragment", also known as a "ref" or a
* "reference". The fragment is indicated by the sharp sign character "#"
* followed by more characters. For example, <blockquote>
*
* <pre>
* http://java.sun.com/index.html#chapter1
* </pre>
*
* </blockquote>
* <p>
* This fragment is not technically part of the URL. Rather, it indicates that
* after the specified resource is retrieved, the application is specifically
* interested in that part of the document that has the tag
* <code>chapter1</code> attached to it. The meaning of a tag is resource
* specific.
* <p>
* An application can also specify a "relative URL", which contains only enough
* information to reach the resource relative to another URL. Relative URLs are
* frequently used within HTML pages. For example, if the contents of the URL:
* <blockquote>
*
* <pre>
* http://java.sun.com/index.html
* </pre>
*
* </blockquote> contained within it the relative URL: <blockquote>
*
* <pre>
* FAQ.html
* </pre>
*
* </blockquote> it would be a shorthand for: <blockquote>
*
* <pre>
* http://java.sun.com/FAQ.html
* </pre>
*
* </blockquote>
* <p>
* The relative URL need not specify all the components of a URL. If the
* protocol, host name, or port number is missing, the value is inherited from
* the fully specified URL. The file component must be specified. The optional
* fragment is not inherited.
* <p>
* The URL class does not itself encode or decode any URL components according
* to the escaping mechanism defined in RFC2396. It is the responsibility of the
* caller to encode any fields, which need to be escaped prior to calling URL,
* and also to decode any escaped fields, that are returned from URL.
* Furthermore, because URL has no knowledge of URL escaping, it does not
* recognise equivalence between the encoded or decoded form of the same URL.
* For example, the two URLs:<br>
*
* <pre>
* http://foo.com/hello world/ and http://foo.com/hello%20world
* </pre>
*
* would be considered not equal to each other.
* <p>
* Note, the {@link java.net.URI} class does perform escaping of its component
* fields in certain circumstances. The recommended way to manage the encoding
* and decoding of URLs is to use {@link java.net.URI}, and to convert between
* these two classes using {link #toURI()} and {@link URI#toURL()}.
* <p>
* The {@link URLEncoder} and {@link URLDecoder} classes can also be used, but
* only for HTML form encoding, which is not the same as the encoding scheme
* defined in RFC2396.
*
* @author James Gosling
* @since JDK1.0
*/
public/* SwingJS final */class URL {// implements Serializable {
// static final long serialVersionUID = -7627629688361524110L;
/**
* The property which specifies the package prefix list to be scanned for
* protocol handlers. The value of this property (if any) should be a vertical
* bar delimited list of package names to search through for a protocol
* handler to load. The policy of this class is that all protocol handlers
* will be in a class called <protocolname>.Handler, and each package in the
* list is examined in turn for a matching handler. If none are found (or the
* property is not specified), the default package prefix,
* sun.net.www.protocol, is used. The search proceeds from the first package
* in the list to the last and stops when a match is found.
*/
// private static final String protocolPathProp =
// "java.protocol.handler.pkgs";
/**
* The protocol to use (ftp, http, nntp, ... etc.) .
*
* @serial
*/
private String protocol;
/**
* The host name to connect to.
*
* @serial
*/
private String host;
/**
* The protocol port to connect to.
*
* @serial
*/
private int port = -1;
/**
* The specified file name on that host. <code>file</code> is defined as
* <code>path[?query]</code>
*
* @serial
*/
private String file;
/**
* The query part of this URL.
*/
private transient String query;
/**
* The authority part of this URL.
*
* @serial
*/
private String authority;
/**
* The path part of this URL.
*/
private transient String path;
/**
* The userinfo part of this URL.
*/
private transient String userInfo;
/**
* # reference.
*
* @serial
*/
private String ref;
/**
* The host's IP address, used in equals and hashCode. Computed on demand. An
* uninitialized or unknown hostAddress is null.
*/
// transient InetAddress hostAddress;
/**
* The URLStreamHandler for this URL.
*/
transient URLStreamHandler handler;
public Object _streamData; // SwingJS - set in javajs.util.AjaxURLConnection
/*
* Our hash code.
*
* @serial
*/
private int hashCode = -1;
/**
* Creates a <code>URL</code> object from the specified <code>protocol</code>,
* <code>host</code>, <code>port</code> number, and <code>file</code>.
* <p>
*
* <code>host</code> can be expressed as a host name or a literal IP address.
* If IPv6 literal address is used, it should be enclosed in square brackets (
* <tt>'['</tt> and <tt>']'</tt>), as specified by <a
* href="http://www.ietf.org/rfc/rfc2732.txt">RFC 2732</a>; However, the
* literal IPv6 address format defined in <a
* href="http://www.ietf.org/rfc/rfc2373.txt"><i>RFC 2373: IP Version 6
* Addressing Architecture</i></a> is also accepted.
* <p>
*
* Specifying a <code>port</code> number of <code>-1</code> indicates that the
* URL should use the default port for the protocol.
* <p>
*
* If this is the first URL object being created with the specified protocol,
* a <i>stream protocol handler</i> object, an instance of class
* <code>URLStreamHandler</code>, is created for that protocol:
* <ol>
* <li>If the application has previously set up an instance of
* <code>URLStreamHandlerFactory</code> as the stream handler factory, then
* the <code>createURLStreamHandler</code> method of that instance is called
* with the protocol string as an argument to create the stream protocol
* handler.
* <li>If no <code>URLStreamHandlerFactory</code> has yet been set up, or if
* the factory's <code>createURLStreamHandler</code> method returns
* <code>null</code>, then the constructor finds the value of the system
* property: <blockquote>
*
* <pre>
* java.protocol.handler.pkgs
* </pre>
*
* </blockquote> If the value of that system property is not <code>null</code>
* , it is interpreted as a list of packages separated by a vertical slash
* character '<code>|</code>'. The constructor tries to load the class named:
* <blockquote>
*
* <pre>
* <<i>package</i>>.<<i>protocol</i>>.Handler
* </pre>
*
* </blockquote> where <<i>package</i>> is replaced by the name of the
* package and <<i>protocol</i>> is replaced by the name of the
* protocol. If this class does not exist, or if the class exists but it is
* not a subclass of <code>URLStreamHandler</code>, then the next package in
* the list is tried.
* <li>If the previous step fails to find a protocol handler, then the
* constructor tries to load from a system default package. <blockquote>
*
* <pre>
* <<i>system default package</i>>.<<i>protocol</i>>.Handler
* </pre>
*
* </blockquote> If this class does not exist, or if the class exists but it
* is not a subclass of <code>URLStreamHandler</code>, then a
* <code>MalformedURLException</code> is thrown.
* </ol>
*
* <p>
* Protocol handlers for the following protocols are guaranteed to exist on
* the search path :- <blockquote>
*
* <pre>
* http, https, ftp, file, and jar
* </pre>
*
* </blockquote> Protocol handlers for additional protocols may also be
* available.
*
* <p>
* No validation of the inputs is performed by this constructor.
*
* @param protocol
* the name of the protocol to use.
* @param host
* the name of the host.
* @param port
* the port number on the host.
* @param file
* the file on the host
* @exception MalformedURLException
* if an unknown protocol is specified.
* @see java.lang.System#getProperty(java.lang.String)
* @see java.net.URL#setURLStreamHandlerFactory(java.net.URLStreamHandlerFactory)
* @see java.net.URLStreamHandler
* @see java.net.URLStreamHandlerFactory#createURLStreamHandler(java.lang.String)
*/
public URL(String protocol, String host, int port, String file)
throws MalformedURLException {
this(protocol, host, port, file, null);
}
/**
* Creates a URL from the specified <code>protocol</code> name,
* <code>host</code> name, and <code>file</code> name. The default port for
* the specified protocol is used.
* <p>
* This method is equivalent to calling the four-argument constructor with the
* arguments being <code>protocol</code>, <code>host</code>, <code>-1</code>,
* and <code>file</code>.
*
* No validation of the inputs is performed by this constructor.
*
* @param protocol
* the name of the protocol to use.
* @param host
* the name of the host.
* @param file
* the file on the host.
* @exception MalformedURLException
* if an unknown protocol is specified.
* @see java.net.URL#URL(java.lang.String, java.lang.String, int,
* java.lang.String)
*/
public URL(String protocol, String host, String file)
throws MalformedURLException {
this(protocol, host, -1, file);
}
/**
* Creates a <code>URL</code> object from the specified <code>protocol</code>,
* <code>host</code>, <code>port</code> number, <code>file</code>, and
* <code>handler</code>. Specifying a <code>port</code> number of
* <code>-1</code> indicates that the URL should use the default port for the
* protocol. Specifying a <code>handler</code> of <code>null</code> indicates
* that the URL should use a default stream handler for the protocol, as
* outlined for: java.net.URL#URL(java.lang.String, java.lang.String, int,
* java.lang.String)
*
* <p>
* If the handler is not null and there is a security manager, the security
* manager's <code>checkPermission</code> method is called with a
* <code>NetPermission("specifyStreamHandler")</code> permission. This may
* result in a SecurityException.
*
* No validation of the inputs is performed by this constructor.
*
* @param protocol
* the name of the protocol to use.
* @param host
* the name of the host.
* @param port
* the port number on the host.
* @param file
* the file on the host
* @param handler
* the stream handler for the URL.
* @exception MalformedURLException
* if an unknown protocol is specified.
* @exception SecurityException
* if a security manager exists and its
* <code>checkPermission</code> method doesn't allow specifying a
* stream handler explicitly.
* @see java.lang.System#getProperty(java.lang.String)
* @see java.net.URL#setURLStreamHandlerFactory(java.net.URLStreamHandlerFactory)
* @see java.net.URLStreamHandler
* @see java.net.URLStreamHandlerFactory#createURLStreamHandler(java.lang.String)
* @see SecurityManager#checkPermission
* @see java.net.NetPermission
*/
public URL(String protocol, String host, int port, String file,
URLStreamHandler handler) throws MalformedURLException {
// if (handler != null) {
// SecurityManager sm = System.getSecurityManager();
// if (sm != null) {
// // check for permission to specify a handler
// checkSpecifyHandler(sm);
// }
// }
protocol = protocol.toLowerCase();
this.protocol = protocol;
if (host != null) {
/**
* if host is a literal IPv6 address, we will make it conform to RFC 2732
*/
if (host.indexOf(':') >= 0 && !host.startsWith("[")) {
host = "[" + host + "]";
}
this.host = host;
if (port < -1) {
throw new MalformedURLException("Invalid port number :" + port);
}
this.port = port;
authority = (port == -1) ? host : host + ":" + port;
}
Parts parts = new Parts(file);
path = parts.getPath();
query = parts.getQuery();
if (query != null) {
this.file = path + "?" + query;
} else {
this.file = path;
}
ref = parts.getRef();
// Note: we don't do validation of the URL here. Too risky to change
// right now, but worth considering for future reference. -br
if (handler == null && (handler = getURLStreamHandler(protocol)) == null) {
throw new MalformedURLException("unknown protocol: " + protocol);
}
this.handler = handler;
}
/**
* Creates a <code>URL</code> object from the <code>String</code>
* representation.
* <p>
* This constructor is equivalent to a call to the two-argument constructor
* with a <code>null</code> first argument.
*
* @param spec
* the <code>String</code> to parse as a URL.
* @exception MalformedURLException
* If the string specifies an unknown protocol. see
* java.net.URL#URL(java.net.URL, java.lang.String)
*/
public URL(String spec) throws MalformedURLException {
this((URL) null, spec, null);
}
/**
* Creates a URL by parsing the given spec within a specified context.
*
* The new URL is created from the given context URL and the spec argument as
* described in RFC2396 "Uniform Resource Identifiers : Generic *
* Syntax" : <blockquote>
*
* <pre>
* <scheme>://<authority><path>?<query>#<fragment>
* </pre>
*
* </blockquote> The reference is parsed into the scheme, authority, path,
* query and fragment parts. If the path component is empty and the scheme,
* authority, and query components are undefined, then the new URL is a
* reference to the current document. Otherwise, the fragment and query parts
* present in the spec are used in the new URL.
* <p>
* If the scheme component is defined in the given spec and does not match the
* scheme of the context, then the new URL is created as an absolute URL based
* on the spec alone. Otherwise the scheme component is inherited from the
* context URL.
* <p>
* If the authority component is present in the spec then the spec is treated
* as absolute and the spec authority and path will replace the context
* authority and path. If the authority component is absent in the spec then
* the authority of the new URL will be inherited from the context.
* <p>
* If the spec's path component begins with a slash character "/"
* then the path is treated as absolute and the spec path replaces the context
* path.
* <p>
* Otherwise, the path is treated as a relative path and is appended to the
* context path, as described in RFC2396. Also, in this case, the path is
* canonicalized through the removal of directory changes made by occurences
* of ".." and ".".
* <p>
* For a more detailed description of URL parsing, refer to RFC2396.
*
* @param context
* the context in which to parse the specification.
* @param spec
* the <code>String</code> to parse as a URL.
* @exception MalformedURLException
* if no protocol is specified, or an unknown protocol is found.
* see java.net.URL#URL(java.lang.String, java.lang.String, int,
* java.lang.String)
* @see java.net.URLStreamHandler
* @see java.net.URLStreamHandler#parseURL(java.net.URL, java.lang.String,
* int, int)
*/
public URL(URL context, String spec) throws MalformedURLException {
this(context, spec, null);
}
/**
* Creates a URL by parsing the given spec with the specified handler within a
* specified context. If the handler is null, the parsing occurs as with the
* two argument constructor.
*
* @param context
* the context in which to parse the specification.
* @param spec
* the <code>String</code> to parse as a URL.
* @param handler
* the stream handler for the URL.
* @exception MalformedURLException
* if no protocol is specified, or an unknown protocol is found.
* @exception SecurityException
* if a security manager exists and its
* <code>checkPermission</code> method doesn't allow specifying a
* stream handler. see java.net.URL#URL(java.lang.String,
* java.lang.String, int, java.lang.String)
* @see java.net.URLStreamHandler
* @see java.net.URLStreamHandler#parseURL(java.net.URL, java.lang.String,
* int, int)
*/
public URL(URL context, String spec, URLStreamHandler handler)
throws MalformedURLException {
spec = spec.trim();
String original = spec;
int i, limit, c;
int start = 0;
String newProtocol = null;
boolean aRef = false;
boolean isRelative = false;
// // Check for permission to specify a handler
// if (handler != null) {
// SecurityManager sm = System.getSecurityManager();
// if (sm != null) {
// checkSpecifyHandler(sm);
// }
// }
try {
limit = spec.length();
// BH: ?? This is exactly what String.trim() does....
// while ((limit > 0) && (spec.charAt(limit - 1) <= ' ')) {
// limit--; // eliminate trailing whitespace
// }
// while ((start < limit) && (spec.charAt(start) <= ' ')) {
// start++; // eliminate leading whitespace
// }
//
if (spec.regionMatches(true, start, "url:", 0, 4)) {
start += 4;
}
if (start < spec.length() && spec.charAt(start) == '#') {
/*
* we're assuming this is a ref relative to the context URL. This means
* protocols cannot start w/ '#', but we must parse ref URL's like:
* "hello:there" w/ a ':' in them.
*/
aRef = true;
}
for (i = start; !aRef && (i < limit) && ((c = spec.charAt(i)) != '/'); i++) {
if (c == ':') {
String s = spec.substring(start, i).toLowerCase();
if (isValidProtocol(s)) {
newProtocol = s;
start = i + 1;
}
break;
}
}
// Only use our context if the protocols match.
protocol = newProtocol;
if ((context != null)
&& ((newProtocol == null) || newProtocol
.equalsIgnoreCase(context.protocol))) {
// inherit the protocol handler from the context
// if not specified to the constructor
if (handler == null) {
handler = context.handler;
}
// If the context is a hierarchical URL scheme and the spec
// contains a matching scheme then maintain backwards
// compatibility and treat it as if the spec didn't contain
// the scheme; see 5.2.3 of RFC2396
if (context.path != null && context.path.startsWith("/"))
newProtocol = null;
if (newProtocol == null) {
protocol = context.protocol;
authority = context.authority;
userInfo = context.userInfo;
host = context.host;
port = context.port;
file = context.file;
path = context.path;
isRelative = true;
}
}
if (protocol == null) {
throw new MalformedURLException("no protocol: " + original);
}
// Get the protocol handler if not specified or the protocol
// of the context could not be used
if (handler == null && (handler = getURLStreamHandler(protocol)) == null) {
throw new MalformedURLException("unknown protocol: " + protocol);
}
this.handler = handler;
i = spec.indexOf('#', start);
if (i >= 0) {
ref = spec.substring(i + 1, limit);
limit = i;
}
/*
* Handle special case inheritance of query and fragment implied by
* RFC2396 section 5.2.2.
*/
if (isRelative && start == limit) {
query = context.query;
if (ref == null) {
ref = context.ref;
}
}
handler.parseURL(this, spec, start, limit);
} catch (MalformedURLException e) {
throw e;
} catch (Exception e) {
MalformedURLException exception = new MalformedURLException(
e.getMessage());
exception.initCause(e);
throw exception;
}
}
/*
* Returns true if specified string is a valid protocol name.
*/
private boolean isValidProtocol(String protocol) {
int len = protocol.length();
if (len < 1)
return false;
char c = protocol.charAt(0);
if (!Character.isLetter(c))
return false;
for (int i = 1; i < len; i++) {
c = protocol.charAt(i);
if (!Character.isLetterOrDigit(c) && c != '.' && c != '+' && c != '-') {
return false;
}
}
return true;
}
// /*
// * Checks for permission to specify a stream handler.
// */
// private void checkSpecifyHandler(@SuppressWarnings("unused")
// SecurityManager sm) {
// //sm.checkPermission(SecurityConstants.SPECIFY_HANDLER_PERMISSION);
// }
/**
* Sets the fields of the URL. This is not a public method so that only
* URLStreamHandlers can modify URL fields. URLs are otherwise constant.
*
* @param protocol
* the name of the protocol to use
* @param host
* the name of the host
* @param port
* the port number on the host
* @param file
* the file on the host
* @param ref
* the internal reference in the URL
*/
protected void set5(String protocol, String host, int port, String file,
String ref) {
synchronized (this) {
this.protocol = protocol;
this.host = host;
authority = port == -1 ? host : host + ":" + port;
this.port = port;
this.file = file;
this.ref = ref;
/*
* This is very important. We must recompute this after the URL has been
* changed.
*/
hashCode = -1;
// hostAddress = null;
int q = file.lastIndexOf('?');
if (q != -1) {
query = file.substring(q + 1);
path = file.substring(0, q);
} else
path = file;
}
}
/**
* Sets the specified 8 fields of the URL. This is not a public method so that
* only URLStreamHandlers can modify URL fields. URLs are otherwise constant.
*
* @param protocol
* the name of the protocol to use
* @param host
* the name of the host
* @param port
* the port number on the host
* @param authority
* the authority part for the url
* @param userInfo
* the username and password
* @param path
* the file on the host
* @param ref
* the internal reference in the URL
* @param query
* the query part of this URL
* @since 1.3
*/
protected void set(String protocol, String host, int port, String authority,
String userInfo, String path, String query, String ref) {
synchronized (this) {
this.protocol = protocol;
this.host = host;
this.port = port;
this.file = query == null ? path : path + "?" + query;
this.userInfo = userInfo;
this.path = path;
this.ref = ref;
/*
* This is very important. We must recompute this after the URL has been
* changed.
*/
hashCode = -1;
// hostAddress = null;
this.query = query;
this.authority = authority;
}
}
/**
* Gets the query part of this <code>URL</code>.
*
* @return the query part of this <code>URL</code>, or <CODE>null</CODE> if
* one does not exist
* @since 1.3
*/
public String getQuery() {
return query;
}
/**
* Gets the path part of this <code>URL</code>.
*
* @return the path part of this <code>URL</code>, or an empty string if one
* does not exist
* @since 1.3
*/
public String getPath() {
return path;
}
/**
* Gets the userInfo part of this <code>URL</code>.
*
* @return the userInfo part of this <code>URL</code>, or <CODE>null</CODE> if
* one does not exist
* @since 1.3
*/
public String getUserInfo() {
return userInfo;
}
/**
* Gets the authority part of this <code>URL</code>.
*
* @return the authority part of this <code>URL</code>
* @since 1.3
*/
public String getAuthority() {
return authority;
}
/**
* Gets the port number of this <code>URL</code>.
*
* @return the port number, or -1 if the port is not set
*/
public int getPort() {
return port;
}
/**
* Gets the default port number of the protocol associated with this
* <code>URL</code>. If the URL scheme or the URLStreamHandler for the URL do
* not define a default port number, then -1 is returned.
*
* @return the port number
* @since 1.4
*/
public int getDefaultPort() {
return handler.getDefaultPort();
}
/**
* Gets the protocol name of this <code>URL</code>.
*
* @return the protocol of this <code>URL</code>.
*/
public String getProtocol() {
return protocol;
}
/**
* Gets the host name of this <code>URL</code>, if applicable. The format of
* the host conforms to RFC 2732, i.e. for a literal IPv6 address, this method
* will return the IPv6 address enclosed in square brackets (<tt>'['</tt> and
* <tt>']'</tt>).
*
* @return the host name of this <code>URL</code>.
*/
public String getHost() {
return host;
}
/**
* Gets the file name of this <code>URL</code>. The returned file portion will
* be the same as <CODE>getPath()</CODE>, plus the concatenation of the value
* of <CODE>getQuery()</CODE>, if any. If there is no query portion, this
* method and <CODE>getPath()</CODE> will return identical results.
*
* @return the file name of this <code>URL</code>, or an empty string if one
* does not exist
*/
public String getFile() {
return file;
}
/**
* Gets the anchor (also known as the "reference") of this <code>URL</code>.
*
* @return the anchor (also known as the "reference") of this <code>URL</code>
* , or <CODE>null</CODE> if one does not exist
*/
public String getRef() {
return ref;
}
/**
* Compares this URL for equality with another object.
* <p>
*
* If the given object is not a URL then this method immediately returns
* <code>false</code>.
* <p>
*
* Two URL objects are equal if they have the same protocol, reference
* equivalent hosts, have the same port number on the host, and the same file
* and fragment of the file.
* <p>
*
* Two hosts are considered equivalent if both host names can be resolved into
* the same IP addresses; else if either host name can't be resolved, the host
* names must be equal without regard to case; or both host names equal to
* null.
* <p>
*
* Since hosts comparison requires name resolution, this operation is a
* blocking operation.
* <p>
*
* Note: The defined behavior for <code>equals</code> is known to be
* inconsistent with virtual hosting in HTTP.
*
* @param obj
* the URL to compare against.
* @return <code>true</code> if the objects are the same; <code>false</code>
* otherwise.
*/
@Override
public boolean equals(Object obj) {
if (!(obj instanceof URL))
return false;
URL u2 = (URL) obj;
return handler.equals2(this, u2);
}
/**
* Creates an integer suitable for hash table indexing.
* <p>
*
* The hash code is based upon all the URL components relevant for URL
* comparison. As such, this operation is a blocking operation.
* <p>
*
* @return a hash code for this <code>URL</code>.
*/
@Override
public synchronized int hashCode() {
if (hashCode != -1)
return hashCode;
hashCode = handler.hashCode(this);
return hashCode;
}
/**
* Compares two URLs, excluding the fragment component.
* <p>
*
* Returns <code>true</code> if this <code>URL</code> and the
* <code>other</code> argument are equal without taking the fragment component
* into consideration.
*
* @param other
* the <code>URL</code> to compare against.
* @return <code>true</code> if they reference the same remote object;
* <code>false</code> otherwise.
*/
public boolean sameFile(URL other) {
return handler.sameFile(this, other);
}
/**
* Constructs a string representation of this <code>URL</code>. The string is
* created by calling the <code>toExternalForm</code> method of the stream
* protocol handler for this object.
*
* @return a string representation of this object. see
* java.net.URL#URL(java.lang.String, java.lang.String, int,
* java.lang.String)
* @see java.net.URLStreamHandler#toExternalForm(java.net.URL)
*/
@Override
public String toString() {
return handler.toExternalForm(this);
}
/**
* Constructs a string representation of this <code>URL</code>. The string is
* created by calling the <code>toExternalForm</code> method of the stream
* protocol handler for this object.
*
* @return a string representation of this object. see
* java.net.URL#URL(java.lang.String, java.lang.String, int,
* java.lang.String)
* @see java.net.URLStreamHandler#toExternalForm(java.net.URL)
*/
public String toExternalForm() {
return handler.toExternalForm(this);
}
/**
* Returns a {@link java.net.URI} equivalent to this URL. This method
* functions in the same way as <code>new URI (this.toString())</code>.
* <p>
* Note, any URL instance that complies with RFC 2396 can be converted to a
* URI. However, some URLs that are not strictly in compliance can not be