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-- File: EntityIterator.cdl
-- Created: Mon Feb 3 14:08:35 1992
-- Author: Christian CAILLET
-- <cky@phobox>
---Copyright: Matra Datavision 1992
class EntityIterator from Interface
---Purpose : Defines an Iterator on Entities, complying with GraphTools
-- needs. Allows considering of various criteria
uses Transient, HSequenceOfTransient from TColStd,
IntVal, InterfaceModel
raises NoMoreObject, NoSuchObject
is
Create returns EntityIterator;
---Purpose : Defines an empty iterator (see AddList & AddItem)
Create (list : HSequenceOfTransient) returns EntityIterator;
---Purpose : Defines an iterator on a list, directly i.e. without copying it
AddList (me : in out; list : HSequenceOfTransient);
---Purpose : Gets a list of entities and adds its to the iteration list
AddItem (me : in out; anentity : any Transient);
---Purpose : Adds to the iteration list a defined entity
GetOneItem (me : in out; anentity : any Transient) is static;
---Purpose : same as AddItem (kept for compatibility)
Reset (me : in out) is protected;
---Purpose : Allows subclasses of EntityIterator to reevaluate an iteration
SelectType (me : in out; atype : Type; keep : Boolean);
---Purpose : Selects entities with are Kind of a given type, keep only
-- them (is keep is True) or reject only them (if keep is False)
NbEntities (me) returns Integer is static;
---Purpose : Returns count of entities which will be iterated on
-- Calls Start if not yet done
NbTyped (me; type : Type) returns Integer is static;
---Purpose : Returns count of entities of a given type (kind of)
Typed (me; type : Type) returns EntityIterator;
---Purpose : Returns the list of entities of a given type (kind of)
Start (me) is virtual;
---Purpose : Allows re-iteration (useless for the first iteration)
More (me) returns Boolean;
---Purpose : Says if there are other entities (vertices) to iterate
-- the first time, calls Start
Next (me) raises NoMoreObject;
---Purpose : Sets iteration to the next entity (vertex) to give
Value (me) returns any Transient raises NoSuchObject;
---Purpose : Returns the current Entity iterated, to be used by Interface
-- tools or by GraphTools (where Entity is a Vertex)
---C++ : return const &
Content (me) returns HSequenceOfTransient;
---Purpose : Returns the content of the Iterator, accessed through a Handle
-- to be used by a frontal-engine logic
-- Returns an empty Sequence if the Iterator is empty
-- Calls Start if not yet done
Destroy (me : in out) is virtual;
---Purpose : Clears data of iteration
---C++: alias "Standard_EXPORT virtual ~Interface_EntityIterator() { Destroy();}"
fields
thecurr : IntVal;
thelist : HSequenceOfTransient;
end EntityIterator;
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