URL 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:
- * - * - * http://www.socs.uts.edu.au/MosaicDocs-old/url-primer.html - *- *
- * In general, a URL can be broken into several parts. The previous
- * example of a URL indicates that the protocol to use is
- * http (HyperText Transfer Protocol) and that the
- * information resides on a host machine named
- * www.socs.uts.edu.au. The information on that host
- * machine is named /MosaicDocs-old/url-primer.html. 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 path component.
- *
- * 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
- * http is 80. An alternative port could be
- * specified as:
- *
- *- * http://www.socs.uts.edu.au:80/MosaicDocs-old/url-primer.html - *
- * The syntax of URL is defined by RFC 2396: Uniform
- * Resource Identifiers (URI): Generic Syntax, amended by RFC 2732: Format for
- * Literal IPv6 Addresses in URLs. The Literal IPv6 address format
- * also supports scope_ids. The syntax and usage of scope_ids is described
- * here.
- *
- * 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, - *
- *- * http://java.sun.com/index.html#chapter1 - *
- * 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 chapter1 attached to it. The
- * meaning of a tag is resource specific.
- *
- * 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: - *
- * contained within it the relative URL: - *- * http://java.sun.com/index.html - *
- * it would be a shorthand for: - *- * FAQ.html - *
- *- * http://java.sun.com/FAQ.html - *
- * 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. - *
- * 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:
- *
http://foo.com/hello world/ and http://foo.com/hello%20world- * would be considered not equal to each other. - *
- * 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()}. - *
- * 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 final class URL implements java.io.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
- *
- *
- *
- * Specifying a
- *
- * If this is the first URL object being created with the specified
- * protocol, a stream protocol handler object, an instance of
- * class Protocol handlers for the following protocols are guaranteed
- * to exist on the search path :-
- * 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
- * This method is equivalent to calling the four-argument
- * constructor with the arguments being If the handler is not null and there is a security manager,
- * the security manager's
- * This constructor is equivalent to a call to the two-argument
- * constructor with a
- * 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.
- *
- * 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.
- *
- * 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.
- *
- * 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 ".".
- *
- * For a more detailed description of URL parsing, refer to RFC2396.
- *
- * @param context the context in which to parse the specification.
- * @param spec the
- *
- * If the given object is not a URL then this method immediately returns
- *
- *
- * 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.
- *
- * 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.
- *
- * Since hosts comparison requires name resolution, this operation is a
- * blocking operation.
- *
- * Note: The defined behavior for
- *
- * The hash code is based upon all the URL components relevant for URL
- * comparison. As such, this operation is a blocking operation.
- *
- * @return a hash code for this
- *
- * Returns A new instance of {@linkplain java.net.URLConnection URLConnection} is
- * created every time when invoking the
- * {@linkplain java.net.URLStreamHandler#openConnection(URL)
- * URLStreamHandler.openConnection(URL)} method of the protocol handler for
- * this URL. It should be noted that a URLConnection instance does not establish
- * the actual network connection on creation. This will happen only when
- * calling {@linkplain java.net.URLConnection#connect() URLConnection.connect()}. If for the URL's protocol (such as HTTP or JAR), there
- * exists a public, specialized URLConnection subclass belonging
- * to one of the following packages or one of their subpackages:
- * java.lang, java.io, java.util, java.net, the connection
- * returned will be of that subclass. For example, for HTTP an
- * HttpURLConnection will be returned, and for JAR a
- * JarURLConnection will be returned.file is
- * defined as path[?query]
- * @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 Object hostAddress;
-
- /**
- * The URLStreamHandler for this URL.
- */
- transient URLStreamHandler handler;
-
- /* Our hash code.
- * @serial
- */
- private int hashCode = -1;
-
- /** input stream associated with the URL */
- private InputStream is;
-
- /**
- * Creates a URL object from the specified
- * protocol, host, port
- * number, and file.host 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 ('[' and ']'), as
- * specified by RFC 2732;
- * However, the literal IPv6 address format defined in RFC 2373: IP
- * Version 6 Addressing Architecture is also accepted.port number of -1
- * indicates that the URL should use the default port for the
- * protocol.URLStreamHandler, is created for that protocol:
- *
- *
- *
- * URLStreamHandlerFactory as the stream handler factory,
- * then the createURLStreamHandler method of that instance
- * is called with the protocol string as an argument to create the
- * stream protocol handler.
- * URLStreamHandlerFactory has yet been set up,
- * or if the factory's createURLStreamHandler method
- * returns null, then the constructor finds the
- * value of the system property:
- *
- * If the value of that system property is not
- * java.protocol.handler.pkgs
- *
null,
- * it is interpreted as a list of packages separated by a vertical
- * slash character '|'. The constructor tries to load
- * the class named:
- *
- * where <package> is replaced by the name of the package
- * and <protocol> 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
- * <package>.<protocol>.Handler
- *
URLStreamHandler, then the next package
- * in the list is tried.
- *
- * If this class does not exist, or if the class exists but it is not a
- * subclass of
- * <system default package>.<protocol>.Handler
- *
URLStreamHandler, then a
- * MalformedURLException is thrown.
- *
- * Protocol handlers for additional protocols may also be
- * available.
- *
- *
- * http, https, ftp, file, and jar
- *
protocol
- * name, host name, and file name. The
- * default port for the specified protocol is used.
- * protocol,
- * host, -1, and file.
- *
- * 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 URL object from the specified
- * protocol, host, port
- * number, file, and handler. Specifying
- * a port number of -1 indicates that
- * the URL should use the default port for the protocol. Specifying
- * a handler of null 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)
- *
- * checkPermission
- * method is called with a
- * NetPermission("specifyStreamHandler") 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
- * checkPermission 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) {
- throw new SecurityException();
- }
-
- 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 URL object from the String
- * representation.
- * null first argument.
- *
- * @param spec the String to parse as a URL.
- * @exception MalformedURLException if no protocol is specified, or an
- * unknown protocol is found, or spec is null.
- * @see java.net.URL#URL(java.net.URL, java.lang.String)
- */
- public URL(String spec) throws MalformedURLException {
- this(null, spec);
- }
-
- private URL(String spec, InputStream is) throws MalformedURLException {
- this(null, spec);
- this.is = is;
- }
-
- /**
- * 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" :
- *
- * 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.
- *
- * <scheme>://<authority><path>?<query>#<fragment>
- *
String to parse as a URL.
- * @exception MalformedURLException if no protocol is specified, or an
- * unknown protocol is found, or spec is null.
- * @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 String 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, or spec is null.
- * @exception SecurityException
- * if a security manager exists and its
- * checkPermission 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
- {
- this(findContext(context), spec, handler != null);
- }
-
- private URL(URL context, String spec, boolean ishandler)
- throws MalformedURLException {
- // Check for permission to specify a handler
- if (ishandler) {
- throw new SecurityException();
- }
- URLStreamHandler handler = null;
-
- String original = spec;
- int i, limit, c;
- int start = 0;
- String newProtocol = null;
- boolean aRef=false;
- boolean isRelative = false;
-
-
- try {
- limit = spec.length();
- 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) {
-//thrw(protocol + " hnd: " + handler.getClass().getName() + " i: " + i);
- 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;
- }
-
- /**
- * 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 set(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 URL.
- *
- * @return the query part of this URL,
- * or null if one does not exist
- * @since 1.3
- */
- public String getQuery() {
- return query;
- }
-
- /**
- * Gets the path part of this URL.
- *
- * @return the path part of this URL, or an
- * empty string if one does not exist
- * @since 1.3
- */
- public String getPath() {
- return path;
- }
-
- /**
- * Gets the userInfo part of this URL.
- *
- * @return the userInfo part of this URL, or
- * null if one does not exist
- * @since 1.3
- */
- public String getUserInfo() {
- return userInfo;
- }
-
- /**
- * Gets the authority part of this URL.
- *
- * @return the authority part of this URL
- * @since 1.3
- */
- public String getAuthority() {
- return authority;
- }
-
- /**
- * Gets the port number of this URL.
- *
- * @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 URL. 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 URL.
- *
- * @return the protocol of this URL.
- */
- public String getProtocol() {
- return protocol;
- }
-
- /**
- * Gets the host name of this URL, 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 ('[' and ']').
- *
- * @return the host name of this URL.
- */
- public String getHost() {
- return host;
- }
-
- /**
- * Gets the file name of this URL.
- * The returned file portion will be
- * the same as getPath(), plus the concatenation of
- * the value of getQuery(), if any. If there is
- * no query portion, this method and getPath() will
- * return identical results.
- *
- * @return the file name of this URL,
- * or an empty string if one does not exist
- */
- public String getFile() {
- return file;
- }
-
- /**
- * Gets the anchor (also known as the "reference") of this
- * URL.
- *
- * @return the anchor (also known as the "reference") of this
- * URL, or null if one does not exist
- */
- public String getRef() {
- return ref;
- }
-
- /**
- * Compares this URL for equality with another object.false.equals is known to
- * be inconsistent with virtual hosting in HTTP.
- *
- * @param obj the URL to compare against.
- * @return true if the objects are the same;
- * false otherwise.
- */
- public boolean equals(Object obj) {
- if (!(obj instanceof URL))
- return false;
- URL u2 = (URL)obj;
-
- return handler.equals(this, u2);
- }
-
- /**
- * Creates an integer suitable for hash table indexing.URL.
- */
- public synchronized int hashCode() {
- if (hashCode != -1)
- return hashCode;
-
- hashCode = handler.hashCode(this);
- return hashCode;
- }
-
- /**
- * Compares two URLs, excluding the fragment component.true if this URL and the
- * other argument are equal without taking the
- * fragment component into consideration.
- *
- * @param other the URL to compare against.
- * @return true if they reference the same remote object;
- * false otherwise.
- */
- public boolean sameFile(URL other) {
- return handler.sameFile(this, other);
- }
-
- /**
- * Constructs a string representation of this URL. The
- * string is created by calling the toExternalForm
- * 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 toString() {
- return toExternalForm();
- }
-
- /**
- * Constructs a string representation of this URL. The
- * string is created by calling the toExternalForm
- * 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.URLConnection URLConnection} instance that
- * represents a connection to the remote object referred to by the
- * {@code URL}.
- *
- * URL and returns an
- * InputStream for reading from that connection. This
- * method is a shorthand for:
- *
- *
- * @return an input stream for reading from the URL connection.
- * @exception IOException if an I/O exception occurs.
- * @see java.net.URL#openConnection()
- * @see java.net.URLConnection#getInputStream()
- */
- public final InputStream openStream() throws java.io.IOException {
- if (is != null) {
- return is;
- }
- byte[] arr = (byte[]) getContent(new Class[] { byte[].class });
- if (arr == null) {
- throw new IOException();
- }
- return new ByteArrayInputStream(arr);
- }
-
- /**
- * Gets the contents of this URL. This method is a shorthand for:
- *
- * openConnection().getInputStream()
- *
- *
- * @return the contents of this URL.
- * @exception IOException if an I/O exception occurs.
- * @see java.net.URLConnection#getContent()
- */
- public final Object getContent() throws java.io.IOException {
- return loadText(toExternalForm());
- }
-
- @JavaScriptBody(args = "url", body = ""
- + "var request = new XMLHttpRequest();\n"
- + "request.open('GET', url, false);\n"
- + "request.send();\n"
- + "return request.responseText;\n"
- )
- private static native String loadText(String url) throws IOException;
-
- @JavaScriptBody(args = { "url", "arr" }, body = ""
- + "var request = new XMLHttpRequest();\n"
- + "request.open('GET', url, false);\n"
- + "request.overrideMimeType('text\\/plain; charset=x-user-defined');\n"
- + "request.send();\n"
- + "var t = request.responseText;\n"
- + "for (var i = 0; i < t.length; i++) arr.push(t.charCodeAt(i) & 0xff);\n"
- + "return arr;\n"
- )
- private static native Object loadBytes(String url, byte[] arr) throws IOException;
-
- /**
- * Gets the contents of this URL. This method is a shorthand for:
- *
- * openConnection().getContent()
- *
- *
- * @param classes an array of Java types
- * @return the content object of this URL that is the first match of
- * the types specified in the classes array.
- * null if none of the requested types are supported.
- * @exception IOException if an I/O exception occurs.
- * @see java.net.URLConnection#getContent(Class[])
- * @since 1.3
- */
- public final Object getContent(Class[] classes)
- throws java.io.IOException {
- for (Class c : classes) {
- if (c == String.class) {
- return loadText(toExternalForm());
- }
- if (c == byte[].class) {
- return loadBytes(toExternalForm(), new byte[0]);
- }
- }
- return null;
- }
-
- static URLStreamHandler getURLStreamHandler(String protocol) {
- URLStreamHandler universal = new URLStreamHandler() {};
- return universal;
- }
-
- private static URL findContext(URL context) throws MalformedURLException {
- if (context == null) {
- String base = findBaseURL();
- if (base != null) {
- context = new URL(null, base, false);
- }
- }
- return context;
- }
-
- @JavaScriptBody(args = {}, body =
- "if (typeof window !== 'object') return null;\n"
- + "if (!window.location) return null;\n"
- + "if (!window.location.href) return null;\n"
- + "return window.location.href;\n"
- )
- private static native String findBaseURL();
-}
-class Parts {
- String path, query, ref;
-
- Parts(String file) {
- int ind = file.indexOf('#');
- ref = ind < 0 ? null: file.substring(ind + 1);
- file = ind < 0 ? file: file.substring(0, ind);
- int q = file.lastIndexOf('?');
- if (q != -1) {
- query = file.substring(q+1);
- path = file.substring(0, q);
- } else {
- path = file;
- }
- }
-
- String getPath() {
- return path;
- }
-
- String getQuery() {
- return query;
- }
-
- String getRef() {
- return ref;
- }
-}
- * openConnection().getContent(Class[])
- *