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note
	description: "Concrete of an external iteration cursor for {HASH_TABLE}."
	library: "EiffelBase: Library of reusable components for Eiffel."
	status: "See notice at end of class."
	legal: "See notice at end of class."
	copyright: "Copyright (c) 1984-2011, Eiffel Software and others"
	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	date: "$Date: 2016-04-13 06:29:38 -0700 (Wed, 13 Apr 2016) $"
	revision: "$Revision: 98619 $"

class 
	HASH_TABLE_ITERATION_CURSOR [G, K -> detachable HASHABLE]

inherit
	READABLE_INDEXABLE_ITERATION_CURSOR [G]
		rename
			target_index as iteration_position
		redefine
			after,
			forth,
			item,
			target
		end

	TABLE_ITERATION_CURSOR [G, K]

create 
	make

feature -- Access

	item: G
			-- Item at current cursor position.
		do
			Result := target.content [iteration_position]
		end

	key: K
			-- Key at current cursor position
		do
			Result := target.keys [iteration_position]
		end
	
feature -- Status report

	after: BOOLEAN
			-- Are there no more items to iterate over?
		local
			l_pos: like iteration_position
		do
			l_pos := iteration_position
			Result := not is_valid or l_pos < 0 or l_pos >= target.keys.count
		end
	
feature -- Cursor movement

	forth
			-- Move to next position.
		local
			i, nb: like step
			l_pos: like iteration_position
		do
			l_pos := iteration_position
			nb := step
			if is_reversed then
				from
					i := 1
				until
					i > nb or else l_pos < 0
				loop
					l_pos := target.previous_iteration_position (l_pos)
					i := i + 1
				end
			else
				from
					i := 1
				until
					i > nb or else l_pos >= target.keys.count
				loop
					l_pos := target.next_iteration_position (l_pos)
					i := i + 1
				end
			end
			iteration_position := l_pos
		end
	
feature {ITERABLE, ITERATION_CURSOR} -- Access

	target: HASH_TABLE [G, K]
			-- Associated structure used for iteration.
	
note
	copyright: "Copyright (c) 1984-2016, Eiffel Software and others"
	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	source: "[
		Eiffel Software
		5949 Hollister Ave., Goleta, CA 93117 USA
		Telephone 805-685-1006, Fax 805-685-6869
		Website http://www.eiffel.com
		Customer support http://support.eiffel.com
	]"

end -- class HASH_TABLE_ITERATION_CURSOR


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