xmlobjectinputstream.java

pastry的java实现的2.0b版

          READ_RESOLVES.put(cl, meth);
          return meth;
        } else {
          READ_RESOLVES.put(cl, null);
          return null;
        }
      } else {
        READ_RESOLVES.put(cl, meth);
        return meth;
      }
    }
  }

  /**
   * This method returns the readResolve() method of a given class, if such a
   * method exists. This method searches the class's heirarchy for a
   * readResolve() method which is assessible by the given class. If no such
   * method is found, null is returned.
   *
   * @param cl The class to find the readResolve() of
   * @return The method, or null if none was found
   */
  private static Method getReadObject(Class cl) {
    synchronized (READ_OBJECTS) {
      if (READ_OBJECTS.containsKey(cl)) {
        return (Method) READ_OBJECTS.get(cl);
      }

      try {
        Method method = cl.getDeclaredMethod("readObject", new Class[]{ObjectInputStream.class});
        method.setAccessible(true);

        READ_OBJECTS.put(cl, method);
        return method;
      } catch (NoSuchMethodException e) {
        READ_OBJECTS.put(cl, null);
        return null;
      }
    }
  }


  // ----- Implementation of GetField -----

  /**
   * This class is an implementation of GetField which is compatible with the
   * XMLObjectInputStreamm. It works in the same manner as the
   * ObjectInputStreamm.GetField.
   *
   * @version $Id: pretty.settings 2305 2005-03-11 20:22:33Z jeffh $
   * @author jeffh
   */
  public class GetField extends ObjectInputStream.GetField {

    /**
     * DESCRIBE THE FIELD
     */
    protected HashMap primitives = new HashMap();

    /**
     * DESCRIBE THE FIELD
     */
    protected HashMap objects = new HashMap();

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     * @return DESCRIBE THE RETURN VALUE
     */
    public boolean get(String name, boolean value) {
      if (primitives.get(name) == null) {
        return value;
      }

      return ((Boolean) primitives.get(name)).booleanValue();
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     * @return DESCRIBE THE RETURN VALUE
     */
    public byte get(String name, byte value) {
      if (primitives.get(name) == null) {
        return value;
      }

      return ((Byte) primitives.get(name)).byteValue();
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     * @return DESCRIBE THE RETURN VALUE
     */
    public char get(String name, char value) {
      if (primitives.get(name) == null) {
        return value;
      }

      return ((Character) primitives.get(name)).charValue();
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     * @return DESCRIBE THE RETURN VALUE
     */
    public double get(String name, double value) {
      if (primitives.get(name) == null) {
        return value;
      }

      return ((Double) primitives.get(name)).doubleValue();
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     * @return DESCRIBE THE RETURN VALUE
     */
    public float get(String name, float value) {
      if (primitives.get(name) == null) {
        return value;
      }

      return ((Float) primitives.get(name)).floatValue();
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     * @return DESCRIBE THE RETURN VALUE
     */
    public int get(String name, int value) {
      if (primitives.get(name) == null) {
        return value;
      }

      return ((Integer) primitives.get(name)).intValue();
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     * @return DESCRIBE THE RETURN VALUE
     */
    public long get(String name, long value) {
      if (primitives.get(name) == null) {
        return value;
      }

      return ((Long) primitives.get(name)).longValue();
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     * @return DESCRIBE THE RETURN VALUE
     */
    public short get(String name, short value) {
      if (primitives.get(name) == null) {
        return value;
      }

      return ((Short) primitives.get(name)).shortValue();
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     * @return DESCRIBE THE RETURN VALUE
     */
    public Object get(String name, Object value) {
      if (objects.get(name) == null) {
        return value;
      }

      return objects.get(name);
    }

    /**
     * Gets the ObjectStreamClass attribute of the GetField object
     *
     * @return The ObjectStreamClass value
     */
    public ObjectStreamClass getObjectStreamClass() {
      throw new UnsupportedOperationException("CANNOT GET THE OBJECT STREAM CLASS!");
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @return DESCRIBE THE RETURN VALUE
     */
    public boolean defaulted(String name) {
      return (!(primitives.containsKey(name) || objects.containsKey(name)));
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     */
    protected void put(String name, boolean value) {
      primitives.put(name, new Boolean(value));
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     */
    protected void put(String name, byte value) {
      primitives.put(name, new Byte(value));
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     */
    protected void put(String name, char value) {
      primitives.put(name, new Character(value));
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     */
    protected void put(String name, double value) {
      primitives.put(name, new Double(value));
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     */
    protected void put(String name, float value) {
      primitives.put(name, new Float(value));
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     */
    protected void put(String name, int value) {
      primitives.put(name, new Integer(value));
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     */
    protected void put(String name, long value) {
      primitives.put(name, new Long(value));
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     */
    protected void put(String name, short value) {
      primitives.put(name, new Short(value));
    }

    /**
     * DESCRIBE THE METHOD
     *
     * @param name DESCRIBE THE PARAMETER
     * @param value DESCRIBE THE PARAMETER
     */
    protected void put(String name, Object value) {
      objects.put(name, value);
    }
  }

  // ----- VALIDATION LIST IMPLEMENTATION ----

  /**
   * Prioritized list of callbacks to be performed once object graph has been
   * completely deserialized.
   *
   * @version $Id: pretty.settings 2305 2005-03-11 20:22:33Z jeffh $
   * @author jeffh
   */
  private static class ValidationList {

    /**
     * linked list of callbacks
     */
    private Callback list;

    /**
     * Creates new (empty) ValidationList.
     */
    ValidationList() {
    }

    /**
     * Registers callback. Throws InvalidObjectException if callback object is
     * null.
     *
     * @param obj DESCRIBE THE PARAMETER
     * @param priority DESCRIBE THE PARAMETER
     * @exception InvalidObjectException DESCRIBE THE EXCEPTION
     */
    void register(ObjectInputValidation obj, int priority) throws InvalidObjectException {
      if (obj == null) {
        throw new InvalidObjectException("null callback");
      }

      Callback prev = null;

      Callback cur = list;
      while (cur != null && priority < cur.priority) {
        prev = cur;
        cur = cur.next;
      }
      if (prev != null) {
        prev.next = new Callback(obj, priority, cur);
      } else {
        list = new Callback(obj, priority, list);
      }
    }

    /**
     * Invokes all registered callbacks and clears the callback list. Callbacks
     * with higher priorities are called first; those with equal priorities may
     * be called in any order. If any of the callbacks throws an
     * InvalidObjectException, the callback process is terminated and the
     * exception propagated upwards.
     *
     * @exception InvalidObjectException DESCRIBE THE EXCEPTION
     */
    void doCallbacks() throws InvalidObjectException {
      try {
        while (list != null) {
          list.obj.validateObject();
          list = list.next;
        }
      } catch (InvalidObjectException ex) {
        list = null;
        throw ex;
      }
    }

    /**
     * Resets the callback list to its initial (empty) state.
     */
    public void clear() {
      list = null;
    }

    /**
     * DESCRIBE THE CLASS
     *
     * @version $Id: pretty.settings 2305 2005-03-11 20:22:33Z jeffh $
     * @author jeffh
     */
    private static class Callback {
      final ObjectInputValidation obj;
      final int priority;
      Callback next;

      /**
       * Constructor for Callback.
       *
       * @param obj DESCRIBE THE PARAMETER
       * @param priority DESCRIBE THE PARAMETER
       * @param next DESCRIBE THE PARAMETER
       */
      Callback(ObjectInputValidation obj, int priority, Callback next) {
        this.obj = obj;
        this.priority = priority;
        this.next = next;
      }
    }
  }
}