Method Detail

• supports

  boolean supports(java.lang.String key)
            throws PolicyContextException

  This public method returns a boolean result indicating whether or not the handler supports the context object identified by the (case-sensitive) key value.

  Parameters:

  key - a String value identifying a context object that could be supported by the handler. The value of this parameter must not be null.

  Returns:

  a boolean indicating whether or not the context object corresponding to the argument key is handled by the handler.

  Throws:

  PolicyContextException - if the implementation throws a checked exception that has not been accounted for by the method signature. The exception thrown by the implementation class will be encapsulated (during construction) in the thrown PolicyContextException

• getKeys

  java.lang.String[] getKeys()
                      throws PolicyContextException

  This public method returns the keys identifying the context objects supported by the handler. The value of each key supported by a handler must be a non-null String value.

  Returns:

  an array containing String values identifying the context objects supported by the handler. The array must not contain duplicate key values. In the unlikely case that the Handler supports no keys, the handler must return a zero length array. The value null must never be returned by this method.

  Throws:

  PolicyContextException - if the implementation throws a checked exception that has not been accounted for by the method signature. The exception thrown by the implementation class will be encapsulated (during construction) in the thrown PolicyContextException

• getContext

  java.lang.Object getContext(java.lang.String key,
                              java.lang.Object data)
                       throws PolicyContextException

  This public method is used by the PolicyContext class to activate the handler and obtain from it the context object identified by the (case-sensitive) key. In addition to the key, the handler will be activated with the handler data value associated within the PolicyContext class with the thread on which the call to this method is made.

  Note that the policy context identifier associated with a thread is available to the handler by calling PolicyContext.getContextID().

  Parameters:

  key - a String that identifies the context object to be returned by the handler. The value of this parameter must not be null.

  data - the handler data Object associated with the thread on which the call to this method has been made. Note that the value passed through this parameter may be null.

  Returns:

  The container and handler specific Object containing the desired context. A null value may be returned if the value of the corresponding context is null.

  Throws:

  PolicyContextException - if the implementation throws a checked exception that has not been accounted for by the method signature. The exception thrown by the implementation class will be encapsulated (during construction) in the thrown PolicyContextException