Automatic generation produced by ISE Eiffel
note description: "Hash tables, used to store items identified by hashable keys using a EQUALITY_TESTER for comparison." legal: "See notice at end of class." status: "See notice at end of class." warning: "[ Modifying an object used as a key by an item present in a table will cause incorrect behavior. If you will be modifying key objects, pass a clone, not the object itself, as key argument to `put` and `replace_key`. ]" date: "$Date: 2013-05-20 15:15:17 -0800 (Mon, 20 May 2013) $" revision: "$Revision: 92557 $" class interface HASH_TABLE_EX [G -> , K -> HASHABLE] create make (n: INTEGER_32) -- Allocate hash table for at least n items. -- The table will be resized automatically -- if more than n items are inserted. -- (from HASH_TABLE) require -- from HASH_TABLE n_non_negative: n >= 0 ensure -- from HASH_TABLE breathing_space: n < capacity more_than_minimum: capacity > Minimum_capacity no_status: not special_status make_with_key_tester (n: INTEGER_32; a_key_tester: detachable EQUALITY_TESTER [K]) -- Allocate hash table for at least n items with a_key_tester to compare keys. -- The table will be resized automatically if more than n items are inserted. require n_non_negative: n >= 0 ensure breathing_space: n < capacity more_than_minimum: capacity > Minimum_capacity key_tester_set: key_tester = a_key_tester no_status: not special_status feature -- Initialization accommodate (n: INTEGER_32) -- Reallocate table with enough space for n items; -- keep all current items. -- (from HASH_TABLE) require -- from HASH_TABLE n >= 0 ensure -- from HASH_TABLE count_not_changed: count = old count breathing_space: count < capacity make (n: INTEGER_32) -- Allocate hash table for at least n items. -- The table will be resized automatically -- if more than n items are inserted. -- (from HASH_TABLE) require -- from HASH_TABLE n_non_negative: n >= 0 ensure -- from HASH_TABLE breathing_space: n < capacity more_than_minimum: capacity > Minimum_capacity no_status: not special_status make_equal (n: INTEGER_32) -- Allocate hash table for at least n items. -- The table will be resized automatically -- if more than n items are inserted. -- Use ~ to compare items. -- (from HASH_TABLE) require -- from HASH_TABLE n_non_negative: n >= 0 ensure -- from HASH_TABLE breathing_space: n < capacity more_than_minimum: capacity > Minimum_capacity no_status: not special_status compare_objects: object_comparison make_from_iterable_tuples (other: ITERABLE [TUPLE [G, K]]) -- (from HASH_TABLE) make_with_key_tester (n: INTEGER_32; a_key_tester: detachable EQUALITY_TESTER [K]) -- Allocate hash table for at least n items with a_key_tester to compare keys. -- The table will be resized automatically if more than n items are inserted. require n_non_negative: n >= 0 ensure breathing_space: n < capacity more_than_minimum: capacity > Minimum_capacity key_tester_set: key_tester = a_key_tester no_status: not special_status feature -- Access at alias "@" (key: K): detachable G assign force -- Item associated with key, if present -- otherwise default value of type G. -- Was declared in {HASH_TABLE} as synonym of `item`. -- (from HASH_TABLE) note option: stable ensure then -- from HASH_TABLE default_value_if_not_present: (not has (key)) implies (Result = computed_default_value) current_keys: ARRAY [K] -- New array containing actually used keys, from 1 to `count` -- (from HASH_TABLE) ensure -- from HASH_TABLE good_count: Result.count = count cursor: CURSOR -- Current cursor position -- (from HASH_TABLE) ensure -- from HASH_TABLE cursor_not_void: Result /= Void definite_item (key: K): G -- Entry of key k. -- (from HASH_TABLE) require -- from TABLE valid_key: has (key) require -- from TABLE valid_key: has (key) found_item: detachable G -- Item, if any, yielded by last search operation -- (from HASH_TABLE) generating_type: TYPE [detachable HASH_TABLE_EX [G, K]] -- Type of current object -- (type of which it is a direct instance) -- (from ANY) ensure -- from ANY generating_type_not_void: Result /= Void generator: STRING_8 -- Name of current object's generating class -- (base class of the type of which it is a direct instance) -- (from ANY) ensure -- from ANY generator_not_void: Result /= Void generator_not_empty: not Result.is_empty has (key: K): BOOLEAN -- Is there an item in the table with key key? -- (from HASH_TABLE) require -- from TABLE True ensure then -- from HASH_TABLE default_case: (key = computed_default_key) implies (Result = has_default) has_item (v: G): BOOLEAN -- Does structure include v? -- (Reference or object equality, based on `object_comparison`.) -- (from HASH_TABLE) ensure -- from CONTAINER not_found_in_empty: Result implies not is_empty has_key (key: K): BOOLEAN -- Is there an item in the table with key key? -- Set `found_item` to the found item. -- (from HASH_TABLE) ensure then -- from HASH_TABLE default_case: (key = computed_default_key) implies (Result = has_default) found: Result = found item_if_found: found implies (found_item = item (key)) hash_code_of (a_key: attached K): INTEGER_32 -- Hash_code value associated to a_key. -- (from HASH_TABLE) ensure -- from HASH_TABLE non_negative: Result >= 0 item alias "[]" (key: K): detachable G assign force -- Item associated with key, if present -- otherwise default value of type G. -- Was declared in {HASH_TABLE} as synonym of `at`. -- (from HASH_TABLE) note option: stable ensure then -- from HASH_TABLE default_value_if_not_present: (not has (key)) implies (Result = computed_default_value) item_for_iteration: G -- Element at current iteration position -- (from HASH_TABLE) require -- from HASH_TABLE not_off: not off iteration_item (i: INTEGER_32): G -- Entry at position i. -- (from HASH_TABLE) require -- from READABLE_INDEXABLE valid_index: valid_iteration_index (i) key_for_iteration: K -- Key at current iteration position -- (from HASH_TABLE) require -- from HASH_TABLE not_off: not off new_cursor: HASH_TABLE_ITERATION_CURSOR [G, K] -- Fresh cursor associated with current structure -- (from HASH_TABLE) require -- from ITERABLE True ensure -- from ITERABLE result_attached: Result /= Void feature -- Measurement capacity: INTEGER_32 -- Number of items that may be stored. -- (from HASH_TABLE) count: INTEGER_32 -- Number of items in table -- (from HASH_TABLE) iteration_lower: INTEGER_32 -- Minimum index. -- (from HASH_TABLE) iteration_upper: INTEGER_32 -- Maximum index. -- (from HASH_TABLE) occurrences (v: G): INTEGER_32 -- Number of table items equal to v. -- (from HASH_TABLE) ensure -- from BAG non_negative_occurrences: Result >= 0 feature -- Comparison frozen deep_equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void -- or attached to isomorphic object structures? -- (from ANY) ensure -- from ANY instance_free: class shallow_implies_deep: standard_equal (a, b) implies Result both_or_none_void: (a = Void) implies (Result = (b = Void)) same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b)) symmetric: Result implies deep_equal (b, a) disjoint (other: HASH_TABLE [G, K]): BOOLEAN -- Is Current and other disjoint on their keys? -- Use `same_keys` for comparison. -- (from HASH_TABLE) frozen equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void or attached -- to objects considered equal? -- (from ANY) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b)) frozen is_deep_equal alias "≡≡≡" (other: HASH_TABLE_EX [G, K]): BOOLEAN -- Are Current and other attached to isomorphic object structures? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY shallow_implies_deep: standard_is_equal (other) implies Result same_type: Result implies same_type (other) symmetric: Result implies other.is_deep_equal (Current) is_equal (other: like Current): BOOLEAN -- Does table contain the same information as other? require -- from ANY other_not_void: other /= Void ensure -- from ANY symmetric: Result implies other ~ Current consistent: standard_is_equal (other) implies Result same_keys (a_search_key, a_key: K): BOOLEAN -- If `key_tester` is attached, does a_search_key equal to a_key based on `key_tester`? -- Otherwise using ~. frozen standard_equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void or attached to -- field-by-field identical objects of the same type? -- Always uses default object comparison criterion. -- (from ANY) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b)) frozen standard_is_equal alias "≜" (other: HASH_TABLE_EX [G, K]): BOOLEAN -- Is other attached to an object of the same type -- as current object, and field-by-field identical to it? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY same_type: Result implies same_type (other) symmetric: Result implies other.standard_is_equal (Current) feature -- Status report after: BOOLEAN -- Is cursor past last item? -- Was declared in {HASH_TABLE} as synonym of `off`. -- (from HASH_TABLE) changeable_comparison_criterion: BOOLEAN -- May `object_comparison` be changed? -- (Answer: yes by default.) -- (from CONTAINER) conflict: BOOLEAN -- Did last operation cause a conflict? -- (from HASH_TABLE) conforms_to (other: ANY): BOOLEAN -- Does type of current object conform to type -- of other (as per Eiffel: The Language, chapter 13)? -- (from ANY) require -- from ANY other_not_void: other /= Void Extendible: BOOLEAN = False -- May new items be added? -- (from HASH_TABLE) found: BOOLEAN -- Did last operation find the item sought? -- (from HASH_TABLE) Full: BOOLEAN = False -- Is structure filled to capacity? -- (from HASH_TABLE) inserted: BOOLEAN -- Did last operation insert an item? -- (from HASH_TABLE) is_empty: BOOLEAN -- Is structure empty? -- (from FINITE) require -- from CONTAINER True is_inserted (v: G): BOOLEAN -- Has v been inserted by the most recent insertion? -- (By default, the value returned is equivalent to calling -- has (v). However, descendants might be able to provide more -- efficient implementations.) -- (from COLLECTION) not_found: BOOLEAN -- Did last operation fail to find the item sought? -- (from HASH_TABLE) object_comparison: BOOLEAN -- Must search operations use `equal` rather than = -- for comparing references? (Default: no, use =.) -- (from CONTAINER) off: BOOLEAN -- Is cursor past last item? -- Was declared in {HASH_TABLE} as synonym of `after`. -- (from HASH_TABLE) prunable: BOOLEAN -- May items be removed? (Answer: yes.) -- (from DYNAMIC_TABLE) removed: BOOLEAN -- Did last operation remove an item? -- (from HASH_TABLE) replaced: BOOLEAN -- Did last operation replace an item? -- (from HASH_TABLE) same_type (other: ANY): BOOLEAN -- Is type of current object identical to type of other? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY definition: Result = (conforms_to (other) and other.conforms_to (Current)) valid_cursor (c: CURSOR): BOOLEAN -- Can cursor be moved to position c? -- (from HASH_TABLE) require -- from HASH_TABLE c_not_void: c /= Void valid_iteration_index (i: INTEGER_32): BOOLEAN -- Is i a valid index? -- (from HASH_TABLE) ensure -- from READABLE_INDEXABLE only_if_in_index_set: Result implies (iteration_lower <= i and i <= iteration_upper) feature -- Status setting compare_objects -- Ensure that future search operations will use `equal` -- rather than = for comparing references. -- (from CONTAINER) require -- from CONTAINER changeable_comparison_criterion: changeable_comparison_criterion ensure -- from CONTAINER object_comparison compare_references -- Ensure that future search operations will use = -- rather than `equal` for comparing references. -- (from CONTAINER) require -- from CONTAINER changeable_comparison_criterion: changeable_comparison_criterion ensure -- from CONTAINER reference_comparison: not object_comparison feature -- Cursor movement forth -- Advance cursor to next occupied position, -- or `off` if no such position remains. -- (from HASH_TABLE) require -- from HASH_TABLE not_off: not off go_to (c: CURSOR) -- Move to position c. -- (from HASH_TABLE) require -- from HASH_TABLE c_not_void: c /= Void valid_cursor: valid_cursor (c) search (key: K) -- Search for item of key key. -- If found, set `found` to true, and set -- `found_item` to item associated with key. -- (from HASH_TABLE) ensure -- from HASH_TABLE found_or_not_found: found or not_found item_if_found: found implies (found_item = item (key)) start -- Bring cursor to first position. -- (from HASH_TABLE) feature -- Element change extend (new: G; key: K) -- Assuming there is no item of key key, -- insert new with key. -- Set `inserted`. -- -- To choose between various insert/replace procedures, -- see usage instructions at end of class. -- (from HASH_TABLE) require -- from HASH_TABLE not_present: not has (key) ensure -- from HASH_TABLE inserted: inserted insertion_done: item (key) = new one_more: count = old count + 1 default_property: has_default = ((key = computed_default_key) or (old has_default)) fill (other: CONTAINER [G]) -- Fill with as many items of other as possible. -- The representations of other and current structure -- need not be the same. -- (from COLLECTION) require -- from COLLECTION other_not_void: other /= Void extendible: Extendible force (new: G; key: K) -- Update table so that new will be the item associated -- with key. -- If there was an item for that key, set `found` -- and set `found_item` to that item. -- If there was none, set `not_found` and set -- `found_item` to the default value. -- -- To choose between various insert/replace procedures, -- see usage instructions at end of class. -- (from HASH_TABLE) require -- from TABLE valid_key: has (key) require else -- from HASH_TABLE True ensure -- from TABLE inserted: definite_item (key) = new ensure then -- from HASH_TABLE insertion_done: item (key) = new now_present: has (key) found_or_not_found: found or not_found not_found_if_was_not_present: not_found = not (old has (key)) same_count_or_one_more: (count = old count) or (count = old count + 1) found_item_is_old_item: found implies (found_item = old (item (key))) default_value_if_not_found: not_found implies (found_item = computed_default_value) default_property: has_default = ((key = computed_default_key) or ((key /= computed_default_key) and (old has_default))) merge (other: HASH_TABLE [G, K]) -- Merge other into Current. If other has some elements -- with same key as in Current, replace them by one from -- other. -- (from HASH_TABLE) require -- from HASH_TABLE other_not_void: other /= Void ensure -- from HASH_TABLE inserted: ∀ o: other ¦ item (@o.key) = o put (new: G; key: K) -- Insert new with key if there is no other item -- associated with the same key. -- Set `inserted` if and only if an insertion has -- been made (i.e. key was not present). -- If so, set `position` to the insertion position. -- If not, set `conflict`. -- In either case, set `found_item` to the item -- now associated with key (previous item if -- there was one, new otherwise). -- -- To choose between various insert/replace procedures, -- see usage instructions at end of class. -- (from HASH_TABLE) require -- from TABLE valid_key: has (key) require else -- from HASH_TABLE True ensure then -- from HASH_TABLE conflict_or_inserted: conflict or inserted insertion_done: inserted implies item (key) = new now_present: inserted implies has (key) one_more_if_inserted: inserted implies (count = old count + 1) unchanged_if_conflict: conflict implies (count = old count) same_item_if_conflict: conflict implies (item (key) = old (item (key))) found_item_associated_with_key: found_item = item (key) new_item_if_inserted: inserted implies (found_item = new) old_item_if_conflict: conflict implies (found_item = old (item (key))) default_property: has_default = ((inserted and (key = computed_default_key)) or ((conflict or (key /= computed_default_key)) and (old has_default))) replace (new: G; key: K) -- Replace item at key, if present, -- with new; do not change associated key. -- Set `replaced` if and only if a replacement has been made -- (i.e. key was present); otherwise set `not_found`. -- Set `found_item` to the item previously associated -- with key (default value if there was none). -- -- To choose between various insert/replace procedures, -- see usage instructions at end of class. -- (from HASH_TABLE) ensure -- from HASH_TABLE replaced_or_not_found: replaced or not_found insertion_done: replaced implies item (key) = new no_change_if_not_found: not_found implies item (key) = old item (key) found_item_is_old_item: found_item = old item (key) replace_key (new_key: K; old_key: K) -- If there is an item of key old_key and no item of key -- new_key, replace the former's key by new_key, -- set `replaced`, and set `found_item` to the item -- previously associated with old_key. -- Otherwise set `not_found` or `conflict` respectively. -- If `conflict`, set `found_item` to the item previously -- associated with new_key. -- -- To choose between various insert/replace procedures, -- see usage instructions at end of class. -- (from HASH_TABLE) ensure -- from HASH_TABLE same_count: count = old count replaced_or_conflict_or_not_found: replaced or conflict or not_found old_absent: (replaced and not same_keys (new_key, old_key)) implies (not has (old_key)) new_present: (replaced or conflict) = has (new_key) new_item: replaced implies (item (new_key) = old (item (old_key))) not_found_implies_no_old_key: not_found implies old (not has (old_key)) conflict_iff_already_present: conflict = old has (new_key) not_inserted_if_conflict: conflict implies (item (new_key) = old item (new_key)) feature -- Removal prune (v: G) -- Remove first occurrence of v, if any, -- after cursor position. -- Move cursor to right neighbor. -- (or after if no right neighbor or v does not occur) -- (from HASH_TABLE) require -- from COLLECTION prunable: prunable prune_all (v: G) -- Remove all occurrences of v. -- (Reference or object equality, -- based on `object_comparison`.) -- (from COLLECTION) require -- from COLLECTION prunable: prunable ensure -- from COLLECTION no_more_occurrences: not has_item (v) remove (key: K) -- Remove item associated with key, if present. -- Set `removed` if and only if an item has been -- removed (i.e. key was present); -- if so, set `position` to index of removed element. -- If not, set `not_found`. -- Reset `found_item` to its default value if `removed`. -- (from HASH_TABLE) require -- from DYNAMIC_TABLE prunable: prunable valid_key: has (key) require else -- from HASH_TABLE prunable ensure then -- from HASH_TABLE removed_or_not_found: removed or not_found not_present: not has (key) one_less: found implies (count = old count - 1) default_case: (key = computed_default_key) implies (not has_default) non_default_case: (key /= computed_default_key) implies (has_default = old has_default) wipe_out -- Reset all items to default values; reset status. -- (from HASH_TABLE) require -- from COLLECTION prunable: prunable ensure -- from COLLECTION wiped_out: is_empty ensure then -- from HASH_TABLE position_equal_to_zero: item_position = 0 count_equal_to_zero: count = 0 has_default_set: not has_default no_status: not special_status feature -- Transformation correct_mismatch -- Attempt to correct object mismatch during retrieve using `mismatch_information`. -- (from HASH_TABLE) feature -- Conversion linear_representation: ARRAYED_LIST [G] -- Representation as a linear structure -- (from HASH_TABLE) require -- from CONTAINER True ensure then -- from HASH_TABLE result_exists: Result /= Void good_count: Result.count = count feature -- Duplication copy (other: like Current) -- Re-initialize from other. require -- from ANY other_not_void: other /= Void type_identity: same_type (other) ensure -- from ANY is_equal: Current ~ other frozen deep_copy (other: HASH_TABLE_EX [G, K]) -- Effect equivalent to that of: -- `copy` (other . `deep_twin`) -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY deep_equal: deep_equal (Current, other) frozen deep_twin: HASH_TABLE_EX [G, K] -- New object structure recursively duplicated from Current. -- (from ANY) ensure -- from ANY deep_twin_not_void: Result /= Void deep_equal: deep_equal (Current, Result) frozen standard_copy (other: HASH_TABLE_EX [G, K]) -- Copy every field of other onto corresponding field -- of current object. -- (from ANY) require -- from ANY other_not_void: other /= Void type_identity: same_type (other) ensure -- from ANY is_standard_equal: standard_is_equal (other) frozen standard_twin: HASH_TABLE_EX [G, K] -- New object field-by-field identical to other. -- Always uses default copying semantics. -- (from ANY) ensure -- from ANY standard_twin_not_void: Result /= Void equal: standard_equal (Result, Current) frozen twin: HASH_TABLE_EX [G, K] -- New object equal to Current -- `twin` calls `copy`; to change copying/twinning semantics, redefine `copy`. -- (from ANY) ensure -- from ANY twin_not_void: Result /= Void is_equal: Result ~ Current feature -- Basic operations frozen default: detachable HASH_TABLE_EX [G, K] -- Default value of object's type -- (from ANY) frozen default_pointer: POINTER -- Default value of type POINTER -- (Avoid the need to write p.`default` for -- some p of type POINTER.) -- (from ANY) ensure -- from ANY instance_free: class default_rescue -- Process exception for routines with no Rescue clause. -- (Default: do nothing.) -- (from ANY) frozen do_nothing -- Execute a null action. -- (from ANY) ensure -- from ANY instance_free: class feature -- Inapplicable bag_put (v: G) -- Ensure that structure includes v. -- (from TABLE) require -- from COLLECTION extendible: Extendible ensure -- from COLLECTION item_inserted: is_inserted (v) collection_extend (v: G) -- Insert a new occurrence of v. -- (from HASH_TABLE) require -- from COLLECTION extendible: Extendible ensure -- from COLLECTION item_inserted: is_inserted (v) feature -- Correction Mismatch_information: MISMATCH_INFORMATION -- Original attribute values of mismatched object -- (from MISMATCH_CORRECTOR) feature -- Output Io: STD_FILES -- Handle to standard file setup -- (from ANY) ensure -- from ANY instance_free: class io_not_void: Result /= Void out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY out_not_void: Result /= Void print (o: detachable ANY) -- Write terse external representation of o -- on standard output. -- (from ANY) ensure -- from ANY instance_free: class frozen tagged_out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY tagged_out_not_void: Result /= Void feature -- Platform Operating_environment: OPERATING_ENVIRONMENT -- Objects available from the operating system -- (from ANY) ensure -- from ANY instance_free: class operating_environment_not_void: Result /= Void invariant -- from HASH_TABLE keys_not_void: keys /= Void content_not_void: content /= Void keys_enough_capacity: keys.count <= capacity + 1 content_enough_capacity: content.count <= capacity + 1 valid_iteration_position: off or truly_occupied (iteration_position) control_non_negative: control >= 0 special_status: special_status = (conflict or inserted or replaced or removed or found or not_found) count_big_enough: 0 <= count count_small_enough: count <= capacity slot_count_big_enough: 0 <= count -- from FINITE empty_definition: is_empty = (count = 0) -- from ANY reflexive_equality: standard_is_equal (Current) reflexive_conformance: conforms_to (Current) -- from READABLE_INDEXABLE consistent_boundaries: iteration_lower <= iteration_upper or else iteration_lower = iteration_upper + 1 note copyright: "Copyright (c) 1984-2009, 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_EX -- Generated by Eiffel Studio --
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