indexing

	description: "COM IEnumUnknown interface"
	status: "See notice at end of class";
	date: "$Date$";
	revision: "$Revision$"

class
	EOLE_ENUM_UNKNOWN

inherit
	EOLE_UNKNOWN
		redefine
			interface_identifier,
			interface_identifier_list
		end

creation
	make
	
feature -- Access

	interface_identifier: STRING is
			-- Unique interface identifier
		once
			Result := Iid_enum_unknown
		end

	interface_identifier_list: LINKED_LIST [STRING] is
			-- List of supported interfaces
		once
			Result := Precursor
			Result.extend (Iid_enum_unknown)
		end

feature -- Message Transmission


	next(count: INTEGER): ARRAY[EOLE_UNKNOWN] is
			-- Retrieve `count' EOLE_UNKNOWN inteface(s) in enumeration sequence.
			-- Not meant to be redefined; redefine `on_next' instead.
		require
			valid_interface: is_valid_interface
		do
			Result := ole2_enum_unknown_next (ole_interface_ptr, count)
		end

	skip (count: INTEGER) is
			-- Skip over `count' EOLE_UNKNOWN interface(s) in enumeration sequence.
		require
			valid_interface: is_valid_interface
		do
			ole2_enum_unknown_skip (ole_interface_ptr, count)
		end

	reset is
			-- Reset enumeration sequence to beginning.  
		require
			valid_interface: is_valid_interface
		do
			ole2_enum_unknown_reset (ole_interface_ptr)
		end

	ole_clone: like Current is
			-- Create a clone of Current.
		require
			valid_interface: is_valid_interface
		do
			!! Result.make
			Result.attach_ole_interface_ptr (ole2_enum_unknown_clone (ole_interface_ptr))
		end
		
feature {EOLE_CALL_DISPATCHER} -- Callback

	on_next (count: INTEGER): ARRAY[EOLE_UNKNOWN] is
			-- Retrieve `count' EOLE_UNKNOWN interface(s) in enumeration sequence.
			-- By default: set status code with `Eole_e_notimpl'.
			-- Redefine in descendant if needed.
		do
			set_last_hresult (E_notimpl)
		end

	on_skip (count: INTEGER) is
			-- Skip over `count' EOLE_CONNECTDATA structure(s) in enumeration sequence.
			-- By default: set status code with `Eole_e_notimpl'.
			-- Redefine in descendant if needed.
		do
			set_last_hresult (E_notimpl)
		end

	on_reset is
			-- Reset enumeration sequence to beginning.  
			-- By default: set status code with `Eole_e_notimpl'.
			-- Redefine in descendant if needed.
		do
			set_last_hresult (E_notimpl)
		end

	on_clone: POINTER is
			-- Create a clone of Current.
		do
			Result := create_new_ole_interface_ptr
		end
		
feature {NONE} -- Implementation

	create_new_ole_interface_ptr: POINTER is
			-- Create a new OLE interface associated
			-- to Current.
		local
			wel_string: WEL_STRING
		do
			!! wel_string.make (Iid_enum_unknown)
			Result := ole2_create_interface_pointer ($Current, wel_string.item)
		end
		
feature {NONE} -- Externals

	ole2_enum_unknown_next (ptr: POINTER; count: INTEGER): ARRAY [EOLE_UNKNOWN] is
		external
			"C"
		alias
			"eole2_enum_unknown_next"
		end

	ole2_enum_unknown_skip (ptr: POINTER; count: INTEGER) is
		external
			"C"
		alias
			"eole2_enum_unknown_skip"
		end
		
	ole2_enum_unknown_reset (ptr: POINTER) is
		external
			"C"
		alias
			"eole2_enum_unknown_reset"
		end

	ole2_enum_unknown_clone (ptr: POINTER): POINTER is
		external
			"C"
		alias
			"eole2_enum_unknown_clone"
		end
		
end -- class EOLE_ENUM_UNKNOWN

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