simpleparameters.java

pastry的java实现的2.0b版

  /**
   * Note, this method does not implicitly call store()
   *
   * @param name
   * @param value
   * @see #store()
   */
  protected void setProperty(String name, String value) {
    if ((defaults.getProperty(name) != null)
      && (defaults.getProperty(name).equals(value))) {
      // setting property back to default, remove override property if any
      if (properties.getProperty(name) != null) {
        properties.remove(name);
        fireChangeEvent(name, value);
      }
    } else {
      if ((properties.getProperty(name) == null)
        || (!properties.getProperty(name).equals(value))) {
        properties.setProperty(name, value);
        fireChangeEvent(name, value);
      }
    }
  }

  /**
   * Sets the Int attribute of the SimpleParameters object
   *
   * @param name The new Int value
   * @param value The new Int value
   */
  public void setInt(String name, int value) {
    setProperty(name, Integer.toString(value));
  }

  /**
   * Sets the Double attribute of the SimpleParameters object
   *
   * @param name The new Double value
   * @param value The new Double value
   */
  public void setDouble(String name, double value) {
    setProperty(name, Double.toString(value));
  }

  /**
   * Sets the Float attribute of the SimpleParameters object
   *
   * @param name The new Float value
   * @param value The new Float value
   */
  public void setFloat(String name, float value) {
    setProperty(name, Float.toString(value));
  }

  /**
   * Sets the Long attribute of the SimpleParameters object
   *
   * @param name The new Long value
   * @param value The new Long value
   */
  public void setLong(String name, long value) {
    setProperty(name, Long.toString(value));
  }

  /**
   * Sets the Boolean attribute of the SimpleParameters object
   *
   * @param name The new Boolean value
   * @param value The new Boolean value
   */
  public void setBoolean(String name, boolean value) {
    setProperty(name, "" + value);
  }

  /**
   * Sets the InetAddress attribute of the SimpleParameters object
   *
   * @param name The new InetAddress value
   * @param value The new InetAddress value
   */
  public void setInetAddress(String name, InetAddress value) {
    setProperty(name, value.getHostAddress());
  }

  /**
   * Sets the InetSocketAddress attribute of the SimpleParameters object
   *
   * @param name The new InetSocketAddress value
   * @param value The new InetSocketAddress value
   */
  public void setInetSocketAddress(String name, InetSocketAddress value) {
    setProperty(name, value.getAddress().getHostAddress() + ":"
      + value.getPort());
  }

  /**
   * Sets the InetSocketAddressArray attribute of the SimpleParameters object
   *
   * @param name The new InetSocketAddressArray value
   * @param value The new InetSocketAddressArray value
   */
  public void setInetSocketAddressArray(String name, InetSocketAddress[] value) {
    StringBuffer buffer = new StringBuffer();

    for (int i = 0; i < value.length; i++) {
      buffer.append(value[i].getAddress().getHostAddress() + ":"
        + value[i].getPort());
      if (i < value.length - 1) {
        buffer.append(ARRAY_SPACER);
      }
    }

    setProperty(name, buffer.toString());
  }

  /**
   * Sets the String attribute of the SimpleParameters object
   *
   * @param name The new String value
   * @param value The new String value
   */
  public void setString(String name, String value) {
    setProperty(name, value);
  }

  /**
   * Sets the StringArray attribute of the SimpleParameters object
   *
   * @param name The new StringArray value
   * @param value The new StringArray value
   */
  public void setStringArray(String name, String[] value) {
    StringBuffer buffer = new StringBuffer();

    for (int i = 0; i < value.length; i++) {
      buffer.append(value[i]);
      if (i < value.length - 1) {
        buffer.append(ARRAY_SPACER);
      }
    }

    setProperty(name, buffer.toString());
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @return DESCRIBE THE RETURN VALUE
   */
  public Enumeration enumerateDefaults() {
    return defaults.keys();
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @return DESCRIBE THE RETURN VALUE
   */
  public Enumeration enumerateNonDefaults() {
    return properties.keys();
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param name DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   * @exception UnknownHostException DESCRIBE THE EXCEPTION
   */
  protected InetSocketAddress parseInetSocketAddress(String name)
     throws UnknownHostException {
    String host = name.substring(0, name.indexOf(":"));
    String port = name.substring(name.indexOf(":") + 1);

    try {
      return new InetSocketAddress(InetAddress.getByName(host), Integer.parseInt(port));
    } catch (UnknownHostException uhe) {
      System.err.println("ERROR: Unable to find IP for ISA " + name
        + " - returning null.");
      return null;
    }
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param name DESCRIBE THE PARAMETER
   */
  public void remove(String name) {
    properties.remove(name);
    fireChangeEvent(name, null);
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param name DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   */
  public boolean contains(String name) {
    if (defaults.containsKey(name)) {
      return true;
    }
    return properties.containsKey(name);
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @exception IOException DESCRIBE THE EXCEPTION
   */
  public void store() throws IOException {
    if (configFileName == null) {
      return;
    }
    try {
      properties.store(new FileOutputStream(configFileName), null);
    } catch (IOException ioe) {
      System.err.println("[Loader       ]: Unable to store properties file "
        + configFileName + ", got error " + ioe);
      throw ioe;
    }
  }

  /**
   * Adds a feature to the ChangeListener attribute of the SimpleParameters
   * object
   *
   * @param p The feature to be added to the ChangeListener attribute
   */
  public void addChangeListener(ParameterChangeListener p) {
    changeListeners.add(p);
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param p DESCRIBE THE PARAMETER
   */
  public void removeChangeListener(ParameterChangeListener p) {
    changeListeners.remove(p);
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param name DESCRIBE THE PARAMETER
   * @param val DESCRIBE THE PARAMETER
   */
  private void fireChangeEvent(String name, String val) {
    Iterator i = changeListeners.iterator();
    while (i.hasNext()) {
      ParameterChangeListener p = (ParameterChangeListener) i.next();
      p.parameterChange(name, val);
    }
  }

  /**
   * DESCRIBE THE CLASS
   *
   * @version $Id: pretty.settings 2305 2005-03-11 20:22:33Z jeffh $
   * @author jeffh
   */
  protected class MyProperties extends Properties {
    /**
     * DESCRIBE THE METHOD
     *
     * @return DESCRIBE THE RETURN VALUE
     */
    public Enumeration keys() {
      final String[] keys = (String[]) keySet().toArray(new String[0]);
      Arrays.sort(keys);

      return
        new Enumeration() {
          int pos = 0;

          public boolean hasMoreElements() {
            return (pos < keys.length);
          }

          public Object nextElement() {
            return keys[pos++];
          }
        };
    }
  }
}