org.omg.CORBA.portable
Class ObjectImpl

java.lang.Object
  |
  +--org.omg.CORBA.portable.ObjectImpl

All Implemented Interfaces:

Object

Direct Known Subclasses:

_BindingIteratorStub, _IDLTypeStub, _NamingContextStub, _PolicyStub, DynamicImplementation, ObjectImpl

public abstract class ObjectImpl

extends Object

implements Object

The common base class for all stub classes; provides default implementations of the org.omg.CORBA.Object methods. All method implementations are forwarded to a Delegate object stored in the ObjectImpl instance. ObjectImpl allows for portable stubs because the Delegate can be implemented by a different vendor-specific ORB.

Constructor Summary

ObjectImpl()

Method Summary

Request	_create_request(Context ctx, String operation, NVList arg_list, NamedValue result) Creates a Request object that contains the given context, method, argument list, and container for the result.
Request	_create_request(Context ctx, String operation, NVList arg_list, NamedValue result, ExceptionList exceptions, ContextList contexts) Creates a Request object that contains the given context, method, argument list, container for the result, exceptions, and list of property names to be used in resolving the context strings.
Object	_duplicate() Returns a duplicate of this ObjectImpl object.
Delegate	_get_delegate() Retrieves the reference to the vendor-specific Delegate object to which this ObjectImpl object delegates all methods invoked on it.
DomainManager[]	_get_domain_managers() Retrieves a list of the domain managers for this ObjectImpl object.
Object	_get_interface_def() Retrieves the interface definition for this ObjectImpl object.
Policy	_get_policy(int policy_type) Retrieves the Policy object for this ObjectImpl object that has the given policy type.
int	_hash(int maximum) Retrieves the hash code that serves as an ORB-internal identifier for this ObjectImpl object.
abstract String[]	_ids() Retrieves a string array containing the repository identifiers supported by this ObjectImpl object.
InputStream	_invoke(OutputStream output) Invokes an operation and returns an InputStream object for reading the response.
boolean	_is_a(String repository_id) Checks whether the object identified by the given repository identifier is an ObjectImpl object.
boolean	_is_equivalent(Object that) Checks whether the the given ObjectImpl object is equivalent to this ObjectImpl object.
boolean	_is_local() Checks whether this ObjectImpl object is implemented by a local servant.
boolean	_non_existent() Checks whether the server object for this ObjectImpl object has been destroyed.
ORB	_orb() Returns a reference to the ORB associated with this object and its delegate.
void	_release() Releases the resources associated with this ObjectImpl object.
void	_releaseReply(InputStream input) Releases the given reply stream back to the ORB when unmarshalling has completed after a call to the method _invoke.
Request	_request(String operation) Creates a Request object containing the given method that can be used with the Dynamic Invocation Interface.
OutputStream	_request(String operation, boolean responseExpected) Returns an OutputStream object to use for marshalling the arguments of the given method.
void	_servant_postinvoke(ServantObject servant) Is called by the local stub after it has invoked an operation on the local servant that was previously retrieved from a call to the method _servant_preinvoke.
ServantObject	_servant_preinvoke(String operation, Class expectedType) Returns a Java reference to the local servant that should be used for sending a request for the method specified.
void	_set_delegate(Delegate delegate) Sets the Delegate for this ObjectImpl instance to the given Delegate object.
Object	_set_policy_override(Policy[] policies, SetOverrideType set_add) Sets this ObjectImpl object's override type for the given policies to the given instance of SetOverrideType.
boolean	equals(Object obj) Compares this ObjectImpl object with the given one for equality.
int	hashCode() Returns the hash code for this ObjectImpl object.
String	toString() Returns a String object that represents this ObjectImpl object.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ObjectImpl

public ObjectImpl()

Method Detail

_get_delegate

public Delegate _get_delegate()

Retrieves the reference to the vendor-specific Delegate object to which this ObjectImpl object delegates all methods invoked on it.

Returns:

the Delegate contained in this ObjectImpl instance

Throws:

BAD_OPERATION - if the delegate has not been set

See Also:

_set_delegate(org.omg.CORBA.portable.Delegate)

_set_delegate

public void _set_delegate(Delegate delegate)

Sets the Delegate for this ObjectImpl instance to the given Delegate object. All method invocations on this ObjectImpl object will be forwarded to this delegate.

Parameters:

delegate - the Delegate instance to which all method calls on this ObjectImpl object will be delegated; may be implemented by a third-party ORB

See Also:

_get_delegate()

_ids

public abstract String[] _ids()

Retrieves a string array containing the repository identifiers supported by this ObjectImpl object. For example, for a stub, this method returns information about all the interfaces supported by the stub.

Returns:

the array of all repository identifiers supported by this ObjectImpl instance

_duplicate

public Object _duplicate()

Returns a duplicate of this ObjectImpl object.

Specified by:

_duplicate in interface Object

Returns:

an orb.omg.CORBA.Object object that is a duplicate of this object

_release

public void _release()

Releases the resources associated with this ObjectImpl object.

Specified by:

_release in interface Object

_is_a

public boolean _is_a(String repository_id)

Checks whether the object identified by the given repository identifier is an ObjectImpl object.

Specified by:

_is_a in interface Object

Parameters:

repository_id - a String object with the repository identifier to check

Returns:

true if the object identified by the given repository id is an instance of ObjectImpl; false otherwise

_is_equivalent

public boolean _is_equivalent(Object that)

Checks whether the the given ObjectImpl object is equivalent to this ObjectImpl object.

Specified by:

_is_equivalent in interface Object

Parameters:

that - an instance of ObjectImpl to compare with this ObjectImpl object

Returns:

true if the given object is equivalent to this ObjectImpl object; false otherwise

_non_existent

public boolean _non_existent()

Checks whether the server object for this ObjectImpl object has been destroyed.

Specified by:

_non_existent in interface Object

Returns:

true if the ORB knows authoritatively that the server object does not exist; false otherwise

_hash

public int _hash(int maximum)

Retrieves the hash code that serves as an ORB-internal identifier for this ObjectImpl object.

Specified by:

_hash in interface Object

Parameters:

maximum - an int indicating the upper bound on the hash value returned by the ORB

Returns:

an int representing the hash code for this ObjectImpl object

_request

public Request _request(String operation)

Creates a Request object containing the given method that can be used with the Dynamic Invocation Interface.

Specified by:

_request in interface Object

Parameters:

operation - the method to be invoked by the new Request object

Returns:

a new Request object initialized with the given method

_create_request

public Request _create_request(Context ctx,
                               String operation,
                               NVList arg_list,
                               NamedValue result)

Creates a Request object that contains the given context, method, argument list, and container for the result.

Specified by:

_create_request in interface Object

Parameters:

ctx - the Context for the request

operation - the method that the new Request object will invoke

arg_list - the arguments for the method; an NVList in which each argument is a NamedValue object

result - a NamedValue object to be used for returning the result of executing the request's method

Returns:

a new Request object initialized with the given context, method, argument list, and container for the return value

_create_request

public Request _create_request(Context ctx,
                               String operation,
                               NVList arg_list,
                               NamedValue result,
                               ExceptionList exceptions,
                               ContextList contexts)

Creates a Request object that contains the given context, method, argument list, container for the result, exceptions, and list of property names to be used in resolving the context strings. This Request object is for use in the Dynamic Invocation Interface.

Specified by:

_create_request in interface Object

Parameters:

ctx - the Context object that contains the context strings that must be resolved before they are sent along with the request

operation - the method that the new Request object will invoke

arg_list - the arguments for the method; an NVList in which each argument is a NamedValue object

result - a NamedValue object to be used for returning the result of executing the request's method

exceptions - a list of the exceptions that the given method throws

contexts - a list of the properties that are needed to resolve the contexts in ctx; the strings in contexts are used as arguments to the method Context.get_values, which returns the value associated with the given property

Returns:

a new Request object initialized with the given context strings to resolve, method, argument list, container for the result, exceptions, and list of property names to be used in resolving the context strings

_get_interface_def

public Object _get_interface_def()

Retrieves the interface definition for this ObjectImpl object.

Specified by:

_get_interface_def in interface Object

Returns:

the org.omg.CORBA.Object instance that is the interface definition for this ObjectImpl object

_orb

public ORB _orb()

Returns a reference to the ORB associated with this object and its delegate. This is the ORB object that created the delegate.

Returns:

the ORB instance that created the Delegate object contained in this ObjectImpl object

_get_policy

public Policy _get_policy(int policy_type)

Retrieves the Policy object for this ObjectImpl object that has the given policy type.

Specified by:

_get_policy in interface Object

Parameters:

policy_type - an int indicating the policy type

Returns:

the Policy object that is the specified policy type and that applies to this ObjectImpl object

See Also:

PolicyOperations.policy_type()

_get_domain_managers

public DomainManager[] _get_domain_managers()

Retrieves a list of the domain managers for this ObjectImpl object.

Specified by:

_get_domain_managers in interface Object

Returns:

an array containing the DomainManager objects for this instance of ObjectImpl

_set_policy_override

public Object _set_policy_override(Policy[] policies,
                                   SetOverrideType set_add)

Sets this ObjectImpl object's override type for the given policies to the given instance of SetOverrideType.

Specified by:

_set_policy_override in interface Object

Parameters:

policies - an array of Policy objects with the policies that will replace the current policies or be added to the current policies

set_add - either SetOverrideType.SET_OVERRIDE, indicating that the given policies will replace any existing ones, or SetOverrideType.ADD_OVERRIDE, indicating that the given policies should be added to any existing ones

Returns:

an Object with the given policies replacing or added to its previous policies

_is_local

public boolean _is_local()

Checks whether this ObjectImpl object is implemented by a local servant. If so, local invocation API's may be used.

Returns:

true if this object is implemented by a local servant; false otherwise

_servant_preinvoke

public ServantObject _servant_preinvoke(String operation,
                                        Class expectedType)

Returns a Java reference to the local servant that should be used for sending a request for the method specified. If this ObjectImpl object is a local stub, it will invoke the _servant_preinvoke method before sending a request in order to obtain the ServantObject instance to use.

If a ServantObject object is returned, its servant field has been set to an object of the expected type (Note: the object may or may not be the actual servant instance). The local stub may cast the servant field to the expected type, and then invoke the operation directly. The ServantRequest object is valid for only one invocation and cannot be used for more than one invocation.

Parameters:

operation - a String containing the name of the method to be invoked. This name should correspond to the method name as it would be encoded in a GIOP request.

expectedType - a Class object representing the expected type of the servant that is returned. This expected type is the Class object associated with the operations class for the stub's interface. For example, a stub for an interface Foo would pass the Class object for the FooOperations interface.

Returns:

(1) a ServantObject object, which may or may not be the actual servant instance, or (2) null if (a) the servant is not local or (b) the servant has ceased to be local due to a ForwardRequest from a POA ServantManager

Throws:

BAD_PARAM - if the servant is not the expected type

_servant_postinvoke

public void _servant_postinvoke(ServantObject servant)

Is called by the local stub after it has invoked an operation on the local servant that was previously retrieved from a call to the method _servant_preinvoke. The _servant_postinvoke method must be called if the _servant_preinvoke method returned a non-null value, even if an exception was thrown by the method invoked by the servant. For this reason, the call to the method _servant_postinvoke should be placed in a Java finally clause.

Parameters:

servant - the instance of the ServantObject returned by the _servant_preinvoke method

_request

public OutputStream _request(String operation,
                             boolean responseExpected)

Returns an OutputStream object to use for marshalling the arguments of the given method. This method is called by a stub, which must indicate if a response is expected, that is, whether or not the call is oneway.

Parameters:

operation - a String giving the name of the method

responseExpected - a boolean -- true if the request is not one way, that is, a response is expected

Returns:

an OutputStream object for dispatching the request

_invoke

public InputStream _invoke(OutputStream output)
                    throws ApplicationException,
                           RemarshalException

Invokes an operation and returns an InputStream object for reading the response. The stub provides the OutputStream object that was previously returned by a call to the _request method. The method specified as an argument to _request when it was called previously is the method that this method invokes.

If an exception occurs, the _invoke method may throw an ApplicationException object that contains an InputStream from which the user exception state may be unmarshalled.

Parameters:

output - an OutputStream object for dispatching the request

Returns:

an InputStream object containing the marshalled response to the method invoked

Throws:

ApplicationException - if the invocation meets application-defined exception

RemarshalException - if the invocation leads to a remarshalling error

See Also:

_request(java.lang.String)

_releaseReply

public void _releaseReply(InputStream input)

Releases the given reply stream back to the ORB when unmarshalling has completed after a call to the method _invoke. Calling this method is optional for the stub.

Parameters:

input - the InputStream object that was returned by the _invoke method or the ApplicationException.getInputStream method; may be null, in which case this method does nothing

See Also:

_invoke(org.omg.CORBA.portable.OutputStream)

toString

public String toString()

Returns a String object that represents this ObjectImpl object.

Overrides:

toString in class Object

Returns:

the String representation of this object

hashCode

public int hashCode()

Returns the hash code for this ObjectImpl object.

Overrides:

hashCode in class Object

Returns:

the hash code for this object

equals

public boolean equals(Object obj)

Compares this ObjectImpl object with the given one for equality.

Overrides:

equals in class Object

Parameters:

obj - the object with which to compare this object

Returns:

true if the two objects are equal; false otherwise