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| ///////////////////////////////////////////////////////////////////////////
// //
// Copyright (c) 2015 by Charta Software B.V. //
// All rights reserved //
// //
// Version: 1.7.0.83525 //
// Web site: https://pascal.chartasoftware.com/ //
// //
// This code and information are provided "as is" without warranty of //
// any kind. Dissemination of this information or reproduction of //
// this material is strictly forbidden unless prior written permission //
// is obtained from Charta Software B.V.. //
// //
///////////////////////////////////////////////////////////////////////////
unit Type_;
interface
uses
Boolean,
Collection.List,
Comparator,
StructuredDocument.Node,
Value;
type
TStorageType = class;
TType = class(TValue)
protected
function IsValueSubtype(Type_: TType): TBoolean;
public
function GetStorageType(): TStorageType; virtual; abstract;
function GetDecoratedType(): TType; virtual;
function GetCaption(): TDocumentNode; virtual;
function IsNullable(): TBoolean; virtual;
function IsNumeric(): TBoolean; virtual;
function CheckValue(Messages: TList<TDocumentNode>; Value: TValue): TBoolean; virtual;
function IsValidValue(Messages: TList<TDocumentNode>; Value: TValue): TBoolean; overload;
function IsValidValue(Value: TValue): TBoolean; overload;
function GetValueComparator(): TComparator<TValue>; virtual;
function IsEquivalentTo(OtherType: TType): TBoolean; virtual;
function IsSupertypeOf(OtherType: TType): TBoolean; virtual;
function OverlapsWith(OtherType: TType): TBoolean; virtual;
function CommonType(OtherType: TType): TType; virtual;
function SharesTypePath(OtherType: TType): TBoolean;
function IsProperSupertypeOf(OtherType: TType): TBoolean;
function IsSubtypeOf(OtherType: TType): TBoolean;
function IsProperSubtypeOf(OtherType: TType): TBoolean;
function Optional(): TType;
end;
// TODO: TStorageType should be replaced by something different. Storage types are dependent on the system that stores the
// values and values of a certain type probably can be stored in many different ways. Indicating one specific storage
// type with the type itself is both limited and cumbersome.
TStorageType = class(TType);
TUnstoredType = class(TStorageType)
public
function GetStorageType(): TStorageType; override;
end;
implementation
uses
Object_.List,
Object_.Reference.Counter,
StructuredDocument.Node.Text,
Type_.Nullable,
Type_.Value;
{ TType }
function TType.CheckValue(Messages: TList<TDocumentNode>; Value: TValue): TBoolean;
begin
Result := False;
end;
function TType.CommonType(OtherType: TType): TType;
begin
// TODO: This is not correct, we should provide a real implementation
Result := Self;
if (Result is TValueType) and not (OtherType is TValueType) then
Result := OtherType;
end;
function TType.GetValueComparator(): TComparator<TValue>;
begin
Result := TValue.TCompare.Instance;
end;
function TType.GetCaption(): TDocumentNode;
begin
Result := TDocumentText.Create(ToText());
end;
function TType.GetDecoratedType(): TType;
begin
Result := Self;
end;
function TType.IsEquivalentTo(OtherType: TType): TBoolean;
begin
Result := Self = OtherType;
end;
function TType.IsNullable(): TBoolean;
begin
Result := False;
end;
function TType.IsNumeric(): TBoolean;
begin
Result := False;
end;
function TType.IsProperSubtypeOf(OtherType: TType): TBoolean;
begin
Result := OtherType.IsSupertypeOf(Self) and not IsEquivalentTo(OtherType);
end;
function TType.IsProperSupertypeOf(OtherType: TType): TBoolean;
begin
Result := IsSupertypeOf(OtherType) and not IsEquivalentTo(OtherType);
end;
function TType.IsSubtypeOf(OtherType: TType): TBoolean;
begin
Result := OtherType.IsSupertypeOf(Self);
end;
function TType.IsSupertypeOf(OtherType: TType): TBoolean;
begin
Result := IsEquivalentTo(OtherType) or IsValueSubtype(OtherType);
end;
function TType.IsValidValue(Value: TValue): TBoolean;
var
Messages: TList<TDocumentNode>;
begin
Messages := TObjectList<TDocumentNode>.Create();
Messages.ElementManager := TReferenceCounter<TDocumentNode>.Create();
Result := CheckValue(Messages, Value);
Messages.Free();
end;
function TType.IsValidValue(Messages: TList<TDocumentNode>; Value: TValue): TBoolean;
begin
Result := CheckValue(Messages, Value);
end;
function TType.IsValueSubtype(Type_: TType): TBoolean;
begin
Result := (Type_ is TValueType) and IsValidValue((Type_ as TValueType).Value);
end;
function TType.Optional(): TType;
begin
Result := TNullableType.Create(Self);
end;
function TType.OverlapsWith(OtherType: TType): TBoolean;
begin
Result := SharesTypePath(OtherType);
end;
function TType.SharesTypePath(OtherType: TType): TBoolean;
begin
Result := IsSupertypeOf(OtherType) or OtherType.IsSupertypeOf(Self);
end;
{ TUnstoredType }
function TUnstoredType.GetStorageType(): TStorageType;
begin
Result := Self;
end;
end.
|