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-- File: PCollection_HDataMap.cdl
-- Created: Wed Feb 19 14:24:56 1992
-- Author: Jean Pierre TIRAULT
-- <jpt@topsn1>
-- Revised: Thu Jan 7 17:26:12 1993
-- By : Mireille MERCIEN
-- <mip@sdsun4>
---Copyright: Matra Datavision 1993
generic class HDataMap from PCollection (Key as Storable;
Item as Storable;
FH as Hash(Key) )
inherits Persistent
---Purpose: A map is a Collection of bindings
-- between two objects. One is considered as
-- the key and a hash code value must be
-- computed for it.
raises MultiplyDefined from Standard,
NoMoreObject from Standard,
NoSuchObject from Standard
class MapNode inherits PManaged
---Purpose: This class is used in the implementation of Map class.
is
Create( aKey : Key ; anItem : Item ; aNext : MapNode)
returns mutable MapNode from PCollection;
GetKey (me) returns any Key is static;
---Level: Internal
---Purpose: Returns myKey
Value(me) returns any Item is static;
---Level: Internal
---Purpose: Returns myItem.
Next(me) returns mutable MapNode is static;
---Level: Internal
---Purpose: Returns myNext.
SetKey (me : mutable ; aKey : Key) is static;
---Level: Internal
---Purpose: Modifies myKey.
SetValue( me : mutable; anItem: Item) is static;
---Level: Internal
---Purpose: Modifies myItem.
SetNext( me : mutable; aNode: MapNode) is static;
---Level: Internal
---Purpose: Modifies myNext.
ShallowCopy(me) returns mutable like me
is redefined;
---Level: Internal
---Purpose: ShallowCopy redefinition
---C++: function call
ShallowDump (me; s: in out OStream)
is redefined;
---Level: Internal
---Purpose: ShallowDump redefinition
---C++: function call
fields
myKey : Key;
myItem : Item;
myNext : MapNode;
end;
class Array instantiates HArray1 from PCollection(MapNode);
class MapIterator
raises NoMoreObject from Standard,
NoSuchObject from Standard
is
---Purpose: This class provides to iterate on a Map from the
-- first bucket entry to the last one in the table;
-- Going through the associated list for each bucket entry.
Create( aMap: HDataMap)
---Purpose: Creates an iterator on <aMap> .
returns MapIterator;
More( me)
---Level: Public
---Purpose: Returns True if there is still an element to be read.
returns Boolean from Standard;
Next( me: in out) raises NoMoreObject from Standard;
---Level: Public
---Purpose: Goes to next element of <me>.
Value( me)
---Level: Public
returns any Item
raises NoSuchObject from Standard;
GetKey( me)
---Level: Public
returns Key
raises NoSuchObject from Standard;
fields
Buckets : Array;
NbBuck : Integer;
Index : Integer;
Node : MapNode;
HasMore : Boolean;
end;
is
Create(NbBuckets : Integer ; F : FH) returns mutable HDataMap;
---Purpose: Creation of a map of NbBuckets entries.
-- the table is empty.
-- If NbBuckets eq. 0 an exception will be raised.
NbBuckets(me) returns Integer from Standard;
---Level: Public
---Purpose: Returns the number of entries in the table.
IsEmpty(me) returns Boolean from Standard;
---Level: Public
---Purpose: Returns true if the table is empty.
Extent(me) returns Integer from Standard ;
---Level: Public
---Purpose: Returns the number of elements in the table.
---Example: if me is the hash table ((a x)(b y)(c z)) Extent
-- returns 3
IsBound(me; K : Key) returns Boolean;
---Level: Public
---Purpose: Returns True if an element is bounded to K
Find(me; K : Key) returns any Item raises NoSuchObject;
---Level: Public
---Purpose: Returns the element bounded to K.
-- Raises an exception if the binding does not exist.
---Example: before
-- me = ((a x)(b y)(c z)) , K = b
-- returns y
Clear(me:mutable);
---Level: Public
---Purpose: Removes all the element in the table.
---Example: before
-- me = ((a x)(b y)(c z))
-- after
-- me = ()
Bind(me:mutable; K : Key; T : Item)
raises MultiplyDefined;
---Level: Public
---Purpose: Creates a binding between a key K and an item T.
-- Raises an exception if the binding already exists.
---Example: before
-- me = ((a x)(b y)) , K = c , T = z
-- after
-- me = ((a x)(b y)(c z))
Rebind(me:mutable; K : Key; T : Item) raises NoSuchObject;
---Level: Public
---Purpose: Replaces the object binded to the key K by T.
-- Raises an exception if the binding does not exist.
---Example: before
-- me = ((a x)(b y)) , K = b , T = z
-- after
-- me = ((a x)(b z))
Unbind(me:mutable; K : Key) raises NoSuchObject;
---Level: Public
---Purpose: Removes the binding keyed by K.
-- Raises an exception if the binding does not exist.
---Example: before
-- me = ((a x)(b y)(c z)) , K = b
-- after
-- me = ((a x)(c z))
ShallowCopy(me) returns mutable like me
is redefined;
---Level: Advanced
---Purpose: ShallowCopy redefinition
---C++: function call
ShallowDump (me; s: in out OStream)
is redefined;
---Level: Advanced
---Purpose: ShallowDump redefinition
---C++: function call
GetArray (me) returns Array is private;
---Level: Internal
---Purpose :Returns the field Buckets associated to the object.
---C++: inline
GetFH (me) returns FH is private;
---Level: Internal
---Purpose :Returns the field Hash associated to the object.
---C++: inline
fields
Buckets : Array;
Hash : FH;
friends class MapIterator from PCollection
end HDataMap;
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