unit HashTable;

{******************************************************************************}
{                                                                              }
{                StarUML - The Open Source UML/MDA Platform.                   }
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{              Copyright (C) 2002-2005 - Plastic Software, Inc.                }
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{******************************************************************************}

{$WARN SYMBOL_PLATFORM OFF}

interface

uses
  Classes, ComObj, ActiveX, Generator_TLB, StdVcl, SysUtils;

const
  ERR_CANNOT_FIND_KEY = 'Key Value doesn''t exist.(%s)';

type
  // exceptions
  EHashTableError = class(Exception);

  // THashTable
  THashTable = class(TAutoObject, IHashTable)
  private
    SL: TStringList;
  protected
    procedure Clear; safecall;
    function Get(const Key: WideString): WideString; safecall;
    procedure Put(const Key, Value: WideString); safecall;
  public
    procedure Initialize; override;
    destructor Destroy; override;
  end;

implementation

uses
  ComServ;

////////////////////////////////////////////////////////////////////////////////
// THashTable

// (consider)
// Cant Recognize in case of multi-lined text ?

procedure THashTable.Initialize;
begin
  inherited;
  SL := TStringList.Create;
end;

destructor THashTable.Destroy;
begin
  SL.Free;
  inherited;
end;

procedure THashTable.Clear;
begin
  SL.Clear;
end;

function THashTable.Get(const Key: WideString): WideString;
var
  Idx: Integer;
begin
  Idx := SL.IndexOfName(Key);
  if Idx = -1 then
    raise EHashTableError.Create(Format(ERR_CANNOT_FIND_KEY, [Key]))
  else
    Result := SL.Values[Key];
end;

procedure THashTable.Put(const Key, Value: WideString);
var
  Idx: Integer;
begin
  Idx := SL.IndexOfName(Key);
  if Idx = -1 then
    SL.Add(Key + '=' + Value)
  else
    SL.Values[Key] := Value;
end;

// THashTable
////////////////////////////////////////////////////////////////////////////////

initialization
  TAutoObjectFactory.Create(ComServer, THashTable, Class_HashTable,
    ciMultiInstance, tmApartment);
end.
