flickr.albums.list.pas

// Copyright (c) 2015, Jordi Corbilla
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// - Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// - Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// - Neither the name of this library nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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unit flickr.albums.list;

interface

uses
  Contnrs, Generics.Collections, flickr.albums;

type
  TAlbumList = class(TDictionary<String, IAlbum>)
  public
    function AddItem(album : IAlbum) : integer;
    function Exists(const album : IAlbum; var existing: IAlbum) : boolean; overload;
    function Exists(const album : string; var existing: IAlbum) : boolean; overload;
  end;

implementation

{ TPoolList }

function TAlbumList.AddItem(album: IAlbum): integer;
var
  albumRet : IAlbum;
begin
  result := 0;
  if not Exists(album, albumRet) then
    Add(album.Id, album)
  else
    album := nil;
end;

function TAlbumList.Exists(const album: IAlbum; var existing: IAlbum): boolean;
begin
  result := TryGetValue(album.Id, existing);
end;

function TAlbumList.Exists(const album: string; var existing: IAlbum): boolean;
begin
  result := TryGetValue(album, existing);
end;

end.