unit Myc.Data.Types.Float;

interface

uses
    Myc.Data.Types;

type
    TDataValueHelper = record helper for TDataValue
    public
        function AsFloat: IDataFloatValue;
    end;

    TDataTypeHelper = record helper for TDataType
    public
        function AsFloat: IDataFloatType;
    end;

    // Public factory for creating float values.
    TFloatType = record
    public
        class function CreateValue(Init: Double): IDataFloatValue; static;
    end;

implementation

uses
    System.SysUtils;

type
    // Implements the float data value.
    TImplDataFloatValue = class(TInterfacedObject, IDataValue, IDataFloatValue)
    private
        FValue: Double;
    public
        constructor Create(const AValue: Double);

        // IDataValue
        function GetDataType: IDataType;

        // IDataFloatValue
        function GetValue: Double;
    end;

    // Implements the float data type.
    TImplDataFloatType = class(TInterfacedObject, IDataType, IDataFloatType)
    strict private
        class var
            FSingleton: IDataFloatType;
        class constructor CreateClass;
    public
        function GetName: String;
        function CreateValue(Init: Double): IDataFloatValue;
        class property Singleton: IDataFloatType read FSingleton;
    end;

{ TImplDataFloatValue }

constructor TImplDataFloatValue.Create(const AValue: Double);
begin
    inherited Create;
    FValue := AValue;
end;

function TImplDataFloatValue.GetDataType: IDataType;
begin
    Result := TImplDataFloatType.Singleton;
end;

function TImplDataFloatValue.GetValue: Double;
begin
    Result := FValue;
end;

{ TImplDataFloatType }

class constructor TImplDataFloatType.CreateClass;
begin
    FSingleton := TImplDataFloatType.Create;
end;

function TImplDataFloatType.GetName: String;
begin
    Result := 'Float';
end;

function TImplDataFloatType.CreateValue(Init: Double): IDataFloatValue;
begin
    Result := TImplDataFloatValue.Create(Init);
end;

{ TFloatType }

class function TFloatType.CreateValue(Init: Double): IDataFloatValue;
begin
    Result := TImplDataFloatType.Singleton.CreateValue(Init);
end;

{ TDataValueHelper }

function TDataValueHelper.AsFloat: IDataFloatValue;
begin
    Result := Self.DataValue as IDataFloatValue;
end;

{ TDataTypeHelper }

function TDataTypeHelper.AsFloat: IDataFloatType;
begin
    Result := Self.DataType as IDataFloatType;
end;

end.