Пример #1
0
 /**
  * Sets the properties of this URL using the provided arguments. Only a {@code URLStreamHandler}
  * can use this method to set fields of the existing URL instance. A URL is generally constant.
  *
  * @param protocol the protocol to be set.
  * @param host the host name to be set.
  * @param port the port number to be set.
  * @param authority the authority to be set.
  * @param userInfo the user-info to be set.
  * @param path the path to be set.
  * @param query the query to be set.
  * @param ref the reference to be set.
  */
 protected void set(
     String protocol,
     String host,
     int port,
     String authority,
     String userInfo,
     String path,
     String query,
     String ref) {
   String filePart = path;
   if (query != null && !query.isEmpty()) {
     if (filePart != null) {
       filePart = filePart + "?" + query;
     } else {
       filePart = "?" + query;
     }
   }
   set(protocol, host, port, filePart, ref);
   this.authority = authority;
   this.userInfo = userInfo;
   this.path = path;
   this.query = query;
 }
Пример #2
0
  /**
   * Creates a new URL to the specified resource {@code spec}. This URL is relative to the given
   * {@code context}. The {@code handler} will be used to parse the URL string representation. If
   * this argument is {@code null} the default {@code URLStreamHandler} will be used. If the
   * protocol of the parsed URL does not match with the protocol of the context URL, then the newly
   * created URL is absolute and bases only on the given URL represented by {@code spec}. Otherwise
   * the protocol is defined by the context URL.
   *
   * @param context the URL which is used as the context.
   * @param spec the URL string representation which has to be parsed.
   * @param handler the specific stream handler to be used by this URL.
   * @throws IOException if the given string {@code spec} could not be parsed as a URL or an invalid
   *     protocol has been found.
   */
  public URL(URL context, String spec) throws MalformedURLException {

    if (spec == null) {
      throw new MalformedURLException();
    }
    spec = spec.trim();

    this.spec = spec;

    // The spec includes a protocol if it includes a colon character
    // before the first occurrence of a slash character. Note that,
    // "protocol" is the field which holds this URLs protocol.
    int index;
    try {
      index = spec.indexOf(':');
    } catch (NullPointerException e) {
      throw new MalformedURLException(e.toString());
    }
    int startIPv6Addr = spec.indexOf('[');
    if (index >= 0) {
      if ((startIPv6Addr == -1) || (index < startIPv6Addr)) {
        protocol = spec.substring(0, index);
        // According to RFC 2396 scheme part should match
        // the following expression:
        // alpha *( alpha | digit | "+" | "-" | "." )
        char c = protocol.charAt(0);
        boolean valid = ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z');
        for (int i = 1; valid && (i < protocol.length()); i++) {
          c = protocol.charAt(i);
          valid =
              ('a' <= c && c <= 'z')
                  || ('A' <= c && c <= 'Z')
                  || ('0' <= c && c <= '9')
                  || (c == '+')
                  || (c == '-')
                  || (c == '.');
        }
        if (!valid) {
          protocol = null;
          index = -1;
        } else {
          // Ignore case in protocol names.
          // Scheme is defined by ASCII characters.
          protocol = protocol.toLowerCase();
        }
      }
    }

    if (protocol != null) {
      // If the context was specified, and it had the same protocol
      // as the spec, then fill in the receiver's slots from the values
      // in the context but still allow them to be over-ridden later
      // by the values in the spec.
      if (context != null && protocol.equals(context.getProtocol())) {
        String cPath = context.getPath();
        if (cPath != null && cPath.startsWith("/")) {
          set(
              protocol,
              context.getHost(),
              context.getPort(),
              context.getAuthority(),
              context.getUserInfo(),
              cPath,
              context.getQuery(),
              null);
        }
      }
    } else {
      // If the spec did not include a protocol, then the context
      // *must* be specified. Fill in the receiver's slots from the
      // values in the context, but still allow them to be over-ridden
      // by the values in the ("relative") spec.
      if (context == null) {
        throw new MalformedURLException("Protocol not found: " + spec);
      }
      set(
          context.getProtocol(),
          context.getHost(),
          context.getPort(),
          context.getAuthority(),
          context.getUserInfo(),
          context.getPath(),
          context.getQuery(),
          null);
    }

    if (port < -1) {
      throw new MalformedURLException("Port out of range: " + port);
    }
  }