current/DataAccess/DataAccess.pas

unit DataAccess;
interface

uses TypeDefs, Classes, StrUtils, SysUtils, _MetaManager;

type
  TDataAccess = class
  private
  protected
    FConnectionID:  Integer;
    FFileName:      String;
    FBackend:       TDataBackend;
    FDataOS:        TDataOS;
    FLevelNumber:   Integer;
    FChangeRights:  TChangeRights;
    FMeta:          TMetaManager;
    procedure SetDataOS(DataOS: TDataOS);
  public
    property ConnectionID: Integer      read FConnectionID;
    property FileName:     String       read FFileName;
    property Backend:      TDataBackend read FBackend;
    property DataOS:       TDataOS      read FDataOS write SetDataOS;
    property LevelNumber:  Integer      read FLevelNumber;
    property ChangeRights: TChangeRights read FChangeRights;
    property MetaData:     TMetaManager read FMeta;

    constructor Create(FileName: String; ConnectionID: Integer; var Msg: TStatusMessages); virtual;
    procedure Close; virtual; abstract;

    function ExtractFileIDOfName(Name: String): Integer; virtual;
    function GetFileInfo(FileID: Integer): TFileInfo; virtual;
    function GetFileInfoByName(Name: String): TFileInfo; virtual;
    function GetFilesList(Ext: String; Pattern: String;
      NoEmptyFiles: Boolean; SortType: TSortType): TStrings; virtual; abstract;
    function GetFileCount: Integer; virtual; abstract;
    function GetExtensionsList(ExtListFormat: TExtensionFormat): TStrings; virtual; abstract;

    procedure LoadDatFile(FileID: Integer; var Target: TStream); overload; virtual; abstract;
    procedure LoadDatFile(FileID: Integer; var Target: TByteData); overload;
    procedure UpdateDatFile(FileID: Integer; Src: TStream); overload; virtual; abstract;
    procedure UpdateDatFile(FileID: Integer; Src: TByteData); overload;
    procedure LoadDatFilePart(FileID, Offset, Size: Integer; var Target: TStream); overload; virtual; abstract;
    procedure LoadDatFilePart(FileID, Offset, Size: Integer; var Target: TByteData); overload;
    procedure LoadDatFilePart(FileID, Offset, Size: Integer; Target: Pointer); overload;
    procedure UpdateDatFilePart(FileID, Offset, Size: Integer; Src: TStream); overload; virtual; abstract;
    procedure UpdateDatFilePart(FileID, Offset, Size: Integer; Src: Pointer); overload;

    function GetDatLinks(FileID: Integer): TDatLinkList; virtual; abstract;
    function GetDatLink(FileID, DatOffset: Integer): TDatLink; virtual; abstract;
    function GetRawList(FileID: Integer): TRawDataList; virtual; abstract;
    function GetRawInfo(FileID, DatOffset: Integer): TRawDataInfo; virtual; abstract;

    procedure LoadRawFile(FileID, DatOffset: Integer; var Target: TStream); overload; virtual; abstract;
    procedure LoadRawFile(FileID, DatOffset: Integer; var Target: TByteData); overload;
    procedure UpdateRawFile(FileID, DatOffset: Integer; Src: TStream); overload; virtual; abstract;
    procedure UpdateRawFile(FileID, DatOffset: Integer; Src: TByteData); overload;
    procedure LoadRawFilePart(FileID, DatOffset, Offset, Size: Integer; var Target: TStream); overload; virtual; abstract;
    procedure LoadRawFilePart(FileID, DatOffset, Offset, Size: Integer; var Target: TByteData); overload;
    procedure LoadRawFilePart(FileID, DatOffset, Offset, Size: Integer; Target: Pointer); overload;
    procedure UpdateRawFilePart(FileID, DatOffset, Offset, Size: Integer; Src: TStream); overload; virtual; abstract;
    procedure UpdateRawFilePart(FileID, DatOffset, Offset, Size: Integer; Src: Pointer); overload;

    function AppendRawFile(LocSep: Boolean; Src: TStream): Integer; overload; virtual;
    function AppendRawFile(LocSep: Boolean; Src: TByteData): Integer; overload;
//    function AppendRawFile(LocSep: Boolean; Size: Integer; Src: Pointer): Integer; overload;
  published
  end;


implementation


(*
 Implementation of TDataAccess
*)

constructor TDataAccess.Create(FileName: String; ConnectionID: Integer;
  var Msg: TStatusMessages);
begin
  FMeta := TMetaManager.Create(FConnectionID, Self);
end;


function TDataAccess.ExtractFileIDOfName(Name: String): Integer;
begin
  if Name[5] = '-' then
    Result := StrToInt(MidStr(Name, 1, 4))
  else
    Result := StrToInt(MidStr(Name, 1, 5));
end;


function TDataAccess.GetFileInfo(FileID: Integer): TFileInfo;
begin
  Result.ID := -1;
  Result.Name := '';
  Result.Extension := '';
  Result.Size := -1;
  Result.FileType := 0;
  Result.DatAddr := -1;
end;


function TDataAccess.GetFileInfoByName(Name: String): TFileInfo;
var
  i:     Integer;
  files: TStrings;
begin
  Result := GetFileInfo(-1);
  files  := GetFilesList('', Name, False, ST_IDAsc);
  if files.Count = 0 then
  else
  begin
    for i := 0 to files.Count - 1 do
    begin
      if MidStr(files.Strings[i], Pos('-', files.Strings[i]) + 1,
            Length(files.Strings[i]) - Pos('-', files.Strings[i]) - 5) = name then
      begin
        Result := GetFileInfo(ExtractFileIDOfName(files.Strings[i]));
        Break;
      end;
    end;
  end;
  files.Free;
end;


procedure TDataAccess.LoadDatFile(FileID: Integer; var Target: TByteData);
var
  data: TStream;
begin
  if fileid < GetFileCount then
  begin
    data := nil;
    LoadDatFile(FileID, data);
    SetLength(Target, data.Size);
    data.Read(Target[0], data.Size);
    data.Free;
  end;
end;

procedure TDataAccess.UpdateDatFile(FileID: Integer; Src: TByteData);
var
  data: TStream;
begin
  if fileid < GetFileCount then
  begin
    data := TMemoryStream.Create;
    data.Write(Src[0], Length(Src));
    data.Seek(0, soFromBeginning);
    UpdateDatFile(FileID, data);
    data.Free;
  end;
end;

procedure TDataAccess.LoadDatFilePart(FileID, Offset, Size: Integer; var Target: TByteData);
var
  data: TStream;
begin
  if fileid < GetFileCount then
  begin
    data := nil;
    LoadDatFilePart(FileID, offset, size, data);
    SetLength(Target, data.Size);
    data.Read(Target[0], data.Size);
    data.Free;
  end;
end;

procedure TDataAccess.LoadDatFilePart(FileID, Offset, Size: Integer; Target: Pointer);
var
  data: TStream;
begin
  if fileid < GetFileCount then
  begin
    data := nil;
    LoadDatFilePart(FileID, offset, size, data);
    data.Read(Target^, data.Size);
    data.Free;
  end;
end;

procedure TDataAccess.UpdateDatFilePart(FileID, Offset, Size: Integer; Src: Pointer);
var
  data: TStream;
begin
  if fileid < GetFileCount then
  begin
    data := TMemoryStream.Create;
    data.Write(Src^, Size);
    data.Seek(0, soFromBeginning);
    UpdateDatFilePart(FileID, offset, size, data);
    data.Free;
  end;
end;


procedure TDataAccess.LoadRawFile(FileID, DatOffset: Integer; var Target: TByteData);
var
  data: TStream;
begin
  if fileid < GetFileCount then
  begin
    data := nil;
    LoadRawFile(FileID, DatOffset, data);
    SetLength(Target, data.Size);
    data.Read(Target[0], data.Size);
    data.Free;
  end;
end;

procedure TDataAccess.UpdateRawFile(FileID, DatOffset: Integer; Src: TByteData);
var
  data: TStream;
begin
  if fileid < GetFileCount then
  begin
    data := TMemoryStream.Create;
    data.Write(Src[0], Length(Src));
    data.Seek(0, soFromBeginning);
    UpdateRawFile(FileID, DatOffset, data);
    data.Free;
  end;
end;

procedure TDataAccess.LoadRawFilePart(FileID, DatOffset, Offset, Size: Integer; var Target: TByteData);
var
  data: TStream;
begin
  if fileid < GetFileCount then
  begin
    data := nil;
    SetLength(Target, Size);
    LoadRawFile(FileID, DatOffset, Data);
    Data.Seek(Offset, soFromBeginning);
    Data.Read(Target[0], Size);
    Data.Free;
  end;
end;

procedure TDataAccess.LoadRawFilePart(FileID, DatOffset, Offset, Size: Integer; Target: Pointer);
var
  data: TStream;
begin
  if fileid < GetFileCount then
  begin
    data := nil;
    LoadRawFile(FileID, DatOffset, Data);
    Data.Seek(Offset, soFromBeginning);
    Data.Read(Target^, Size);
    Data.Free;
  end;
end;

procedure TDataAccess.UpdateRawFilePart(FileID, DatOffset, Offset, Size: Integer; Src: Pointer);
var
  data: TStream;
begin
  if fileid < GetFileCount then
  begin
    data := TMemoryStream.Create;
    data.Write(Src^, Size);
    data.Seek(0, soFromBeginning);
    UpdateRawFilePart(FileID, DatOffset, Offset, Size, data);
    data.Free;
  end;
end;


function TDataAccess.AppendRawFile(LocSep: Boolean; Src: TStream): Integer;
begin
  raise ENotImplemented.Create('ERROR: AppendRawFile not implemented here!!!');
end;


function TDataAccess.AppendRawFile(LocSep: Boolean; Src: TByteData): Integer;
var
  data: TStream;
begin
  data := TMemoryStream.Create;
  data.Write(Src[0], Length(Src));
  data.Seek(0, soFromBeginning);
  Result := AppendRawFile(LocSep, data);
  data.Free;
end;
{
function TDataAccess.AppendRawFile(LocSep: Boolean; Size: Integer; Src: Pointer): Integer;
var
  data: TStream;
begin
  data := TMemoryStream.Create;
  data.Write(Src^, Size);
  data.Seek(0, soFromBeginning);
  Result := AppendRawFile(LocSep, data);
  data.Free;
end;
}


procedure TDataAccess.SetDataOS(DataOS: TDataOS);
begin
  raise ENotImplemented.Create('TDataAccess.SetDataOS: TBD!');
end;

end.
Revision:	229
Committed:	Wed Jun 20 10:57:51 2007 UTC (18 years, 3 months ago) by alloc
Content type:	text/x-pascal
File size:	9344 byte(s)
Log Message:
#	Content
1	unit DataAccess;
2	interface
3
4	uses TypeDefs, Classes, StrUtils, SysUtils, _MetaManager;
5
6	type
7	TDataAccess = class
8	private
9	protected
10	FConnectionID: Integer;
11	FFileName: String;
12	FBackend: TDataBackend;
13	FDataOS: TDataOS;
14	FLevelNumber: Integer;
15	FChangeRights: TChangeRights;
16	FMeta: TMetaManager;
17	procedure SetDataOS(DataOS: TDataOS);
18	public
19	property ConnectionID: Integer read FConnectionID;
20	property FileName: String read FFileName;
21	property Backend: TDataBackend read FBackend;
22	property DataOS: TDataOS read FDataOS write SetDataOS;
23	property LevelNumber: Integer read FLevelNumber;
24	property ChangeRights: TChangeRights read FChangeRights;
25	property MetaData: TMetaManager read FMeta;
26
27	constructor Create(FileName: String; ConnectionID: Integer; var Msg: TStatusMessages); virtual;
28	procedure Close; virtual; abstract;
29
30	function ExtractFileIDOfName(Name: String): Integer; virtual;
31	function GetFileInfo(FileID: Integer): TFileInfo; virtual;
32	function GetFileInfoByName(Name: String): TFileInfo; virtual;
33	function GetFilesList(Ext: String; Pattern: String;
34	NoEmptyFiles: Boolean; SortType: TSortType): TStrings; virtual; abstract;
35	function GetFileCount: Integer; virtual; abstract;
36	function GetExtensionsList(ExtListFormat: TExtensionFormat): TStrings; virtual; abstract;
37
38	procedure LoadDatFile(FileID: Integer; var Target: TStream); overload; virtual; abstract;
39	procedure LoadDatFile(FileID: Integer; var Target: TByteData); overload;
40	procedure UpdateDatFile(FileID: Integer; Src: TStream); overload; virtual; abstract;
41	procedure UpdateDatFile(FileID: Integer; Src: TByteData); overload;
42	procedure LoadDatFilePart(FileID, Offset, Size: Integer; var Target: TStream); overload; virtual; abstract;
43	procedure LoadDatFilePart(FileID, Offset, Size: Integer; var Target: TByteData); overload;
44	procedure LoadDatFilePart(FileID, Offset, Size: Integer; Target: Pointer); overload;
45	procedure UpdateDatFilePart(FileID, Offset, Size: Integer; Src: TStream); overload; virtual; abstract;
46	procedure UpdateDatFilePart(FileID, Offset, Size: Integer; Src: Pointer); overload;
47
48	function GetDatLinks(FileID: Integer): TDatLinkList; virtual; abstract;
49	function GetDatLink(FileID, DatOffset: Integer): TDatLink; virtual; abstract;
50	function GetRawList(FileID: Integer): TRawDataList; virtual; abstract;
51	function GetRawInfo(FileID, DatOffset: Integer): TRawDataInfo; virtual; abstract;
52
53	procedure LoadRawFile(FileID, DatOffset: Integer; var Target: TStream); overload; virtual; abstract;
54	procedure LoadRawFile(FileID, DatOffset: Integer; var Target: TByteData); overload;
55	procedure UpdateRawFile(FileID, DatOffset: Integer; Src: TStream); overload; virtual; abstract;
56	procedure UpdateRawFile(FileID, DatOffset: Integer; Src: TByteData); overload;
57	procedure LoadRawFilePart(FileID, DatOffset, Offset, Size: Integer; var Target: TStream); overload; virtual; abstract;
58	procedure LoadRawFilePart(FileID, DatOffset, Offset, Size: Integer; var Target: TByteData); overload;
59	procedure LoadRawFilePart(FileID, DatOffset, Offset, Size: Integer; Target: Pointer); overload;
60	procedure UpdateRawFilePart(FileID, DatOffset, Offset, Size: Integer; Src: TStream); overload; virtual; abstract;
61	procedure UpdateRawFilePart(FileID, DatOffset, Offset, Size: Integer; Src: Pointer); overload;
62
63	function AppendRawFile(LocSep: Boolean; Src: TStream): Integer; overload; virtual;
64	function AppendRawFile(LocSep: Boolean; Src: TByteData): Integer; overload;
65	// function AppendRawFile(LocSep: Boolean; Size: Integer; Src: Pointer): Integer; overload;
66	published
67	end;
68
69
70
71	implementation
72
73
74	(*
75	Implementation of TDataAccess
76	*)
77
78	constructor TDataAccess.Create(FileName: String; ConnectionID: Integer;
79	var Msg: TStatusMessages);
80	begin
81	FMeta := TMetaManager.Create(FConnectionID, Self);
82	end;
83
84
85
86	function TDataAccess.ExtractFileIDOfName(Name: String): Integer;
87	begin
88	if Name[5] = '-' then
89	Result := StrToInt(MidStr(Name, 1, 4))
90	else
91	Result := StrToInt(MidStr(Name, 1, 5));
92	end;
93
94
95	function TDataAccess.GetFileInfo(FileID: Integer): TFileInfo;
96	begin
97	Result.ID := -1;
98	Result.Name := '';
99	Result.Extension := '';
100	Result.Size := -1;
101	Result.FileType := 0;
102	Result.DatAddr := -1;
103	end;
104
105
106	function TDataAccess.GetFileInfoByName(Name: String): TFileInfo;
107	var
108	i: Integer;
109	files: TStrings;
110	begin
111	Result := GetFileInfo(-1);
112	files := GetFilesList('', Name, False, ST_IDAsc);
113	if files.Count = 0 then
114	else
115	begin
116	for i := 0 to files.Count - 1 do
117	begin
118	if MidStr(files.Strings[i], Pos('-', files.Strings[i]) + 1,
119	Length(files.Strings[i]) - Pos('-', files.Strings[i]) - 5) = name then
120	begin
121	Result := GetFileInfo(ExtractFileIDOfName(files.Strings[i]));
122	Break;
123	end;
124	end;
125	end;
126	files.Free;
127	end;
128
129
130	procedure TDataAccess.LoadDatFile(FileID: Integer; var Target: TByteData);
131	var
132	data: TStream;
133	begin
134	if fileid < GetFileCount then
135	begin
136	data := nil;
137	LoadDatFile(FileID, data);
138	SetLength(Target, data.Size);
139	data.Read(Target[0], data.Size);
140	data.Free;
141	end;
142	end;
143
144	procedure TDataAccess.UpdateDatFile(FileID: Integer; Src: TByteData);
145	var
146	data: TStream;
147	begin
148	if fileid < GetFileCount then
149	begin
150	data := TMemoryStream.Create;
151	data.Write(Src[0], Length(Src));
152	data.Seek(0, soFromBeginning);
153	UpdateDatFile(FileID, data);
154	data.Free;
155	end;
156	end;
157
158	procedure TDataAccess.LoadDatFilePart(FileID, Offset, Size: Integer; var Target: TByteData);
159	var
160	data: TStream;
161	begin
162	if fileid < GetFileCount then
163	begin
164	data := nil;
165	LoadDatFilePart(FileID, offset, size, data);
166	SetLength(Target, data.Size);
167	data.Read(Target[0], data.Size);
168	data.Free;
169	end;
170	end;
171
172	procedure TDataAccess.LoadDatFilePart(FileID, Offset, Size: Integer; Target: Pointer);
173	var
174	data: TStream;
175	begin
176	if fileid < GetFileCount then
177	begin
178	data := nil;
179	LoadDatFilePart(FileID, offset, size, data);
180	data.Read(Target^, data.Size);
181	data.Free;
182	end;
183	end;
184
185	procedure TDataAccess.UpdateDatFilePart(FileID, Offset, Size: Integer; Src: Pointer);
186	var
187	data: TStream;
188	begin
189	if fileid < GetFileCount then
190	begin
191	data := TMemoryStream.Create;
192	data.Write(Src^, Size);
193	data.Seek(0, soFromBeginning);
194	UpdateDatFilePart(FileID, offset, size, data);
195	data.Free;
196	end;
197	end;
198
199
200
201	procedure TDataAccess.LoadRawFile(FileID, DatOffset: Integer; var Target: TByteData);
202	var
203	data: TStream;
204	begin
205	if fileid < GetFileCount then
206	begin
207	data := nil;
208	LoadRawFile(FileID, DatOffset, data);
209	SetLength(Target, data.Size);
210	data.Read(Target[0], data.Size);
211	data.Free;
212	end;
213	end;
214
215	procedure TDataAccess.UpdateRawFile(FileID, DatOffset: Integer; Src: TByteData);
216	var
217	data: TStream;
218	begin
219	if fileid < GetFileCount then
220	begin
221	data := TMemoryStream.Create;
222	data.Write(Src[0], Length(Src));
223	data.Seek(0, soFromBeginning);
224	UpdateRawFile(FileID, DatOffset, data);
225	data.Free;
226	end;
227	end;
228
229	procedure TDataAccess.LoadRawFilePart(FileID, DatOffset, Offset, Size: Integer; var Target: TByteData);
230	var
231	data: TStream;
232	begin
233	if fileid < GetFileCount then
234	begin
235	data := nil;
236	SetLength(Target, Size);
237	LoadRawFile(FileID, DatOffset, Data);
238	Data.Seek(Offset, soFromBeginning);
239	Data.Read(Target[0], Size);
240	Data.Free;
241	end;
242	end;
243
244	procedure TDataAccess.LoadRawFilePart(FileID, DatOffset, Offset, Size: Integer; Target: Pointer);
245	var
246	data: TStream;
247	begin
248	if fileid < GetFileCount then
249	begin
250	data := nil;
251	LoadRawFile(FileID, DatOffset, Data);
252	Data.Seek(Offset, soFromBeginning);
253	Data.Read(Target^, Size);
254	Data.Free;
255	end;
256	end;
257
258	procedure TDataAccess.UpdateRawFilePart(FileID, DatOffset, Offset, Size: Integer; Src: Pointer);
259	var
260	data: TStream;
261	begin
262	if fileid < GetFileCount then
263	begin
264	data := TMemoryStream.Create;
265	data.Write(Src^, Size);
266	data.Seek(0, soFromBeginning);
267	UpdateRawFilePart(FileID, DatOffset, Offset, Size, data);
268	data.Free;
269	end;
270	end;
271
272
273	function TDataAccess.AppendRawFile(LocSep: Boolean; Src: TStream): Integer;
274	begin
275	raise ENotImplemented.Create('ERROR: AppendRawFile not implemented here!!!');
276	end;
277
278
279	function TDataAccess.AppendRawFile(LocSep: Boolean; Src: TByteData): Integer;
280	var
281	data: TStream;
282	begin
283	data := TMemoryStream.Create;
284	data.Write(Src[0], Length(Src));
285	data.Seek(0, soFromBeginning);
286	Result := AppendRawFile(LocSep, data);
287	data.Free;
288	end;
289	{
290	function TDataAccess.AppendRawFile(LocSep: Boolean; Size: Integer; Src: Pointer): Integer;
291	var
292	data: TStream;
293	begin
294	data := TMemoryStream.Create;
295	data.Write(Src^, Size);
296	data.Seek(0, soFromBeginning);
297	Result := AppendRawFile(LocSep, data);
298	data.Free;
299	end;
300	}
301
302
303	procedure TDataAccess.SetDataOS(DataOS: TDataOS);
304	begin
305	raise ENotImplemented.Create('TDataAccess.SetDataOS: TBD!');
306	end;
307
308	end.