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(*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*)
unit ConsoleHelper;
interface
uses Classes, SysUtils, SyncObjs;
type
TThriftConsole = class
strict private
FLock : TCriticalSection;
strict protected
procedure Lock;
procedure UnLock;
public
constructor Create;
destructor Destroy; override;
procedure Write( const S: string); virtual;
procedure WriteLine( const S: string); virtual;
end;
TGUIConsole = class( TThriftConsole )
strict private
FLineBreak : Boolean;
FMemo : TStrings;
procedure InternalWrite( const S: string; bWriteLine: Boolean);
public
constructor Create( AMemo: TStrings);
procedure Write( const S: string); override;
procedure WriteLine( const S: string); override;
end;
function Console: TThriftConsole;
procedure ChangeConsole( AConsole: TThriftConsole );
procedure RestoreConsoleToDefault;
implementation
var
FDefaultConsole : TThriftConsole;
FConsole : TThriftConsole;
function Console: TThriftConsole;
begin
Result := FConsole;
end;
{ TThriftConsole }
constructor TThriftConsole.Create;
begin
inherited Create;
FLock := TCriticalSection.Create;
end;
destructor TThriftConsole.Destroy;
begin
FreeAndNil( FLock);
inherited Destroy;
end;
procedure TThriftConsole.Lock;
begin
FLock.Enter;
end;
procedure TThriftConsole.UnLock;
begin
FLock.Leave;
end;
procedure TThriftConsole.Write(const S: string);
begin
Lock;
try
System.Write( S );
finally
Unlock;
end;
end;
procedure TThriftConsole.WriteLine(const S: string);
begin
Lock;
try
System.Writeln( S );
finally
Unlock;
end;
end;
procedure ChangeConsole( AConsole: TThriftConsole );
begin
FConsole := AConsole;
end;
procedure RestoreConsoleToDefault;
begin
FConsole := FDefaultConsole;
end;
{ TGUIConsole }
constructor TGUIConsole.Create( AMemo: TStrings);
begin
inherited Create;
FMemo := AMemo;
FLineBreak := True;
end;
procedure TGUIConsole.InternalWrite(const S: string; bWriteLine: Boolean);
var idx : Integer;
begin
Lock;
try
if FLineBreak then begin
FMemo.Add( S )
end
else begin
idx := FMemo.Count - 1;
if idx < 0
then FMemo.Add( S )
else FMemo[idx] := FMemo[idx] + S;
end;
FLineBreak := bWriteLine;
finally
Unlock;
end;
end;
procedure TGUIConsole.Write(const S: string);
begin
InternalWrite( S, False);
end;
procedure TGUIConsole.WriteLine(const S: string);
begin
InternalWrite( S, True);
end;
initialization
FDefaultConsole := TThriftConsole.Create;
FConsole := FDefaultConsole;
finalization
FDefaultConsole.Free;
FDefaultConsole := nil;
end.
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