/// <summary>
/// Saves meta info for cached files such as Source, ContentType and Expiry date
/// </summary>
/// <param name="cacheFilePath">Full path to the cached (image) file.</param>
/// <param name="sourceLocation">External source url.</param>
/// <param name="response">Response object from the external server contining information we want to store in meta data.</param>
private async Task <AssetMeta> SaveMeta(string metaFilePath, Uri sourceLocation, HttpResponseMessage response)
{
if (response != null)
{
var meta = new AssetMeta()
{
SourceUrl = sourceLocation.AbsoluteUri,
ContentType = response.Content.Headers.ContentType?.MediaType,
ResponseCode = (int)response.StatusCode,
RequestTime = DateTimeOffset.UtcNow
//Expires = response.Content.Headers?.Expires //unfortunately expires does not always comply with standards (see below)
};
IEnumerable <string> expires;
if (response.Content.Headers.TryGetValues("Expires", out expires))
{
DateTimeOffset expiryDate;
var dateStr = expires.FirstOrDefault()?.Replace("UTC", "GMT"); //Flickr date is not compliant to ISO 8601
if (DateTimeOffset.TryParse(dateStr, out expiryDate))
{
meta.Expires = expiryDate;
}
}
using (var fileStream = new FileStream(metaFilePath, FileMode.Create, FileAccess.Write, FileShare.None, 4096, true))
using (var writer = new StreamWriter(fileStream))
await writer.WriteAsync(JsonConvert.SerializeObject(meta));
return(meta);
}
return(null);
}
public async ValueTask <Sprite> Load(AssetMeta meta)
{
if (null == meta)
{
throw new ArgumentNullException(nameof(meta));
}
if (null == meta.Properties)
{
throw new ArgumentException("properties missing", nameof(AssetMeta.Properties));
}
if (!meta.Properties.TryGetValue("width", out var tmp) ||
!int.TryParse(tmp.ToString(), out var width))
{
throw new ArgumentException("invalid width", nameof(AssetMeta.Properties));
}
if (!meta.Properties.TryGetValue("height", out tmp) ||
!int.TryParse(tmp.ToString(), out var height))
{
throw new ArgumentException("invalid height", nameof(AssetMeta.Properties));
}
var bounds = new Rectangle(0, 0, width, height);
var elementRef = new ElementReference(Guid.NewGuid().ToString());
return(new Sprite(meta.Path, elementRef, bounds, meta.Path));
}
public async ValueTask <AnimationCollection> Load(AssetMeta meta)
{
var dto = await _httpClient.GetFromJsonAsync <AnimationsFile>(meta.Path);
var asset = dto.ToAsset();
return(asset);
}
public ValueTask <Sound> Load(AssetMeta meta)
{
var type = meta.Properties["type"].ToString();
var name = meta.Properties["name"].ToString();
var sound = new Sound(meta.Path, name, type);
return(ValueTask.FromResult(sound));
}
public async ValueTask <MapObjects> Load(AssetMeta meta)
{
var dtos = await _httpClient.GetFromJsonAsync <MapObjectRaw[]>(meta.Path);
var mapObjects = dtos.Select(d => d.ToModel());
return(new MapObjects(meta.Path, mapObjects));
}
public async ValueTask <SpriteSheet> Load(AssetMeta meta)
{
var dto = await _httpClient.GetFromJsonAsync <SpriteSheetDTO>(meta.Path);
var elementRef = new ElementReference(Guid.NewGuid().ToString());
var sprites = dto.sprites
.Select(s => new SpriteBase(s.name, elementRef, new Rectangle(s.x, s.y, s.width, s.height)))
.ToArray();
return(new SpriteSheet(meta.Path, elementRef, dto.imagePath, sprites));
}
private AssetMeta GetOrNewMeta(string asset)
{
var id = HashAssetID(asset);
AssetMeta meta;
if (!mAssets.TryGetValue(id, out meta))
{
meta = new AssetMeta(asset);
mAssets[id] = meta;
}
return(meta);
}
public async ValueTask <TA> Load <TA>(AssetMeta meta) where TA : IAsset
{
if (meta == null)
{
throw new ArgumentNullException(nameof(meta));
}
var loader = _assetLoaderFactory.Get <TA>();
var asset = await loader.Load(meta);
if (null == asset)
{
throw new TypeLoadException($"unable to load asset type '{typeof(TA)}' from path '{meta.Path}'");
}
_assets.AddOrUpdate(meta.Path, k => asset, (k, v) => asset);
return(asset);
}
// 加载资源
private bool LoadAsset <T>(AssetMeta meta, AssetHandler <T> handler, ErrorHandler errorhandler) where T : Object
{
if (meta.assetInstence != null)
{
if (handler != null)
{
handler(meta.assetInstence as T);
}
return(false);
}
bool load = false;
if (meta.abData != null && meta.abData.assetBundle == null)
{
load |= LoadAB <AssetBundle>(meta.abData.name, meta.abData, null, null);
}
var assethandler = GetHandler(meta.Identify);
if (assethandler == null)
{
assethandler = new AssetObtain <T>(meta);
mHandlers.AddLast(assethandler);
mLoaders++;
load = true;
assethandler.DoComplete(FinishAndLoadNextAsset);
}
if (handler != null)
{
assethandler.RegistHandler(handler);
}
if (errorhandler != null)
{
assethandler.RegistErrorHandler(errorhandler);
}
return(load);
}
public AssetObtain(AssetMeta meta)
{
mMeta = meta;
}