Exemplo n.º 1
0
  /**
   * 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.
   *
   * <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
   * @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;
  }
Exemplo n.º 2
0
  /**
   * 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,
   *     or <tt>spec</tt> is <tt>null</tt>.
   * @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 {
    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();
      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;
    }
  }