/// <summary>
/// Tries to get cached file as byte array.
/// </summary>
/// <returns>The get async.</returns>
/// <param name="key">Key.</param>
/// <param name="token">Token.</param>
public async Task <byte[]> TryGetAsync(string key, CancellationToken token)
{
key = SanitizeKey(key);
await WaitForPendingWriteIfExists(key).ConfigureAwait(false);
if (!entries.ContainsKey(key))
{
return(null);
}
try
{
string filepath = Path.Combine(basePath, key);
if (!FileStore.Exists(filepath))
{
return(null);
}
return(await FileStore.ReadBytesAsync(filepath, token).ConfigureAwait(false));
}
catch
{
return(null);
}
}
/// <summary>
/// Tries to get cached file as byte array.
/// </summary>
/// <returns>The get async.</returns>
/// <param name="key">Key.</param>
/// <param name="token">Token.</param>
public async Task <byte[]> TryGetAsync(string key, CancellationToken token)
{
key = SanitizeKey(key);
await WaitForPendingWriteIfExists(key).ConfigureAwait(false);
if (!entries.ContainsKey(key))
{
return(null);
}
try
{
string filepath = Path.Combine(basePath, key);
if (!FileStore.Exists(filepath))
{
return(null);
}
using (var fs = FileStore.GetInputStream(filepath))
{
using (var ms = new MemoryStream())
{
await fs.CopyToAsync(ms, BufferSize, token).ConfigureAwait(false);
return(ms.ToArray());
}
}
}
catch
{
return(null);
}
}
/// <summary>
/// Tries to get cached file as byte array.
/// </summary>
/// <returns>The get async.</returns>
/// <param name="key">Key.</param>
/// <param name="token">Token.</param>
public async Task <byte[]> TryGetAsync(string key, CancellationToken token)
{
var sanitizedKey = SanitizeKey(key);
await WaitForPendingWriteIfExists(sanitizedKey).ConfigureAwait(false);
try
{
CacheEntry entry;
if (!_entries.TryGetValue(sanitizedKey, out entry))
{
return(null);
}
string filepath = Path.Combine(_cachePath, entry.FileName);
if (!FileStore.Exists(filepath))
{
return(null);
}
return(await FileStore.ReadBytesAsync(filepath, token).ConfigureAwait(false));
}
catch
{
return(null);
}
}
public Task <UIImageData> GetData(string identifier, CancellationToken token)
{
int scale = (int)ScaleHelper.Scale;
if (scale > 1)
{
var filename = Path.GetFileNameWithoutExtension(identifier);
var extension = Path.GetExtension(identifier);
const string pattern = "{0}@{1}x{2}";
while (scale > 1)
{
var file = String.Format(pattern, filename, scale, extension);
if (FileStore.Exists(file))
{
return(GetDataInternal(file, token));
}
scale--;
}
}
if (FileStore.Exists(identifier))
{
return(GetDataInternal(identifier, token));
}
return(Task.FromResult((UIImageData)null));
}
public virtual Task <Tuple <Stream, LoadingResult, ImageInformation> > Resolve(string identifier, TaskParameter parameters, CancellationToken token)
{
string file = null;
int scale = (int)ScaleHelper.Scale;
if (scale > 1)
{
var filename = Path.GetFileNameWithoutExtension(identifier);
var extension = Path.GetExtension(identifier);
const string pattern = "{0}@{1}x{2}";
while (scale > 1)
{
token.ThrowIfCancellationRequested();
var tmpFile = string.Format(pattern, filename, scale, extension);
if (FileStore.Exists(tmpFile))
{
file = tmpFile;
break;
}
scale--;
}
}
if (string.IsNullOrEmpty(file) && FileStore.Exists(identifier))
{
file = identifier;
}
token.ThrowIfCancellationRequested();
if (!string.IsNullOrEmpty(file))
{
var stream = FileStore.GetInputStream(file, true);
var imageInformation = new ImageInformation();
imageInformation.SetPath(identifier);
imageInformation.SetFilePath(file);
var result = (LoadingResult)(int)parameters.Source;
if (parameters.LoadingPlaceholderPath == identifier)
{
result = (LoadingResult)(int)parameters.LoadingPlaceholderSource;
}
else if (parameters.ErrorPlaceholderPath == identifier)
{
result = (LoadingResult)(int)parameters.ErrorPlaceholderSource;
}
return(Task.FromResult(new Tuple <Stream, LoadingResult, ImageInformation>(
stream, result, imageInformation)));
}
throw new FileNotFoundException(identifier);
}
public Task <WithLoadingResult <Stream> > GetStream(string identifier, CancellationToken token)
{
if (!FileStore.Exists(identifier))
{
return(Task.FromResult(WithLoadingResult.Encapsulate((Stream)null, LoadingResult.NotFound)));
}
var result = WithLoadingResult.Encapsulate(FileStore.GetInputStream(identifier), LoadingResult.Disk);
return(Task.FromResult(result));
}
public Task <WithLoadingResult <Stream> > GetStream(string identifier, CancellationToken token)
{
if (!FileStore.Exists(identifier))
{
return(Task.FromResult(WithLoadingResult.Encapsulate((Stream)null, LoadingResult.NotFound)));
}
var imageInformation = new ImageInformation();
imageInformation.SetPath(identifier);
imageInformation.SetFilePath(identifier);
var result = WithLoadingResult.Encapsulate(FileStore.GetInputStream(identifier), LoadingResult.Disk, imageInformation);
return(Task.FromResult(result));
}
public string Read(int id)
{
log.Reading(id);
var path = GetFileName(id);
if (!fileStore.Exists(path))
{
log.DidNotFind(id);
return(string.Empty);
}
var message = fileStore.ReadAllText(path);
log.Returning(id);
return(message);
}
public async Task <UIImageData> GetData(string identifier, CancellationToken token)
{
if (!FileStore.Exists(identifier))
{
return(null);
}
var bytes = await FileStore.ReadBytesAsync(identifier).ConfigureAwait(false);
var result = (LoadingResult)(int)_source; // Some values of ImageSource and LoadingResult are shared
return(new UIImageData()
{
Data = bytes, Result = result, ResultIdentifier = identifier
});
}
public Task <Tuple <Stream, LoadingResult, ImageInformation> > Resolve(string identifier, TaskParameter parameters, CancellationToken token)
{
if (!FileStore.Exists(identifier))
{
throw new FileNotFoundException(identifier);
}
var stream = FileStore.GetInputStream(identifier, true);
var imageInformation = new ImageInformation();
imageInformation.SetPath(identifier);
imageInformation.SetFilePath(identifier);
return(Task.FromResult(new Tuple <Stream, LoadingResult, ImageInformation>(
stream, LoadingResult.Disk, imageInformation)));
}
public virtual Task <DataResolverResult> Resolve(string identifier, TaskParameter parameters, CancellationToken token)
{
if (!FileStore.Exists(identifier))
{
throw new FileNotFoundException(identifier);
}
token.ThrowIfCancellationRequested();
var stream = FileStore.GetInputStream(identifier, true);
var imageInformation = new ImageInformation();
imageInformation.SetPath(identifier);
imageInformation.SetFilePath(identifier);
return(Task.FromResult(new DataResolverResult(
stream, LoadingResult.Disk, imageInformation)));
}
/// <summary>
/// Ensures the file can actually be written to the path and will return the full path as string
/// </summary>
/// <param name="folder">The name of the folder</param>
/// <param name="fullName">The name of the file</param>
/// <returns>Full path of the file location</returns>
private string FileChecks(string folder, string fullName)
{
try
{
FileStore.EnsureFolderExists(folder);
}
catch (Exception ex)
{
Mvx.IoCProvider.Resolve <IMvxLog>().ErrorException("ExStorageService.FileChecks", ex);
}
var fullPath = FileStore.PathCombine(folder, fullName);
if (FileStore.Exists(fullPath))
{
DeleteFile(folder, fullName);
}
return(fullPath);
}
public bool TryGetValue <T>(object key, out T value)
{
if (!_memCache.TryGetValue(key, out value)) // check inside memory
{
if (_fileStore.Exists(key, cacheCluster)) // check inside disk
{
// check expiration
var cacheEntryOptions = _fileStore.LoadAttachment <FileCacheEntryOptions>(key, "FsCacheEntryOptions", cacheCluster);
var expired = false;
if (cacheEntryOptions != null)
{
expired = cacheEntryOptions.CheckExpired(_systemClock.UtcNow);
}
if (!expired)
{
value = _fileStore.Load <T>(key, cacheCluster); // load from disk
// create cache in-memory
var entry = CreateEntry(key);
if (cacheEntryOptions != null)
{
entry.SetOptions(cacheEntryOptions.ToMemoryOptions());
}
entry.SetValue(value);
// need to manually call dispose instead of having a using
// in case the factory passed in throws, in which case we
// do not want to add the entry to the cache
entry.Dispose();
}
return(!expired);
}
}
else
{
return(true);
}
return(false);
}
public async Task <byte[]> TryGetAsync(string key)
{
key = SanitizeKey(key);
byte[] data = null;
if (!entries.ContainsKey(key))
{
return(null);
}
try {
string filepath = Path.Combine(basePath, key);
if (!FileStore.Exists(filepath))
{
return(null);
}
data = await FileStore.ReadBytesAsync(filepath).ConfigureAwait(false);
} catch {
return(null);
}
return(data);
}
/// <summary>
/// Check if a file exists on a certain location
/// </summary>
/// <param name="folder">The name of the folder</param>
/// <param name="fullName">The name of the file</param>
/// <returns>True if the file exists, otherwise false.</returns>
public override bool Exists(string folder, string fullName)
{
var fullPath = FileStore.PathCombine(folder, fullName);
return(FileStore.Exists(fullPath));
}
protected virtual async Task <UIImage> GetImageAsync(string sourcePath, ImageSource source)
{
if (CancellationToken.IsCancellationRequested)
{
return(null);
}
byte[] bytes = null;
string path = sourcePath;
try
{
switch (source)
{
case ImageSource.ApplicationBundle:
case ImageSource.Filepath:
if (FileStore.Exists(path))
{
bytes = await FileStore.ReadBytesAsync(path).ConfigureAwait(false);
}
break;
case ImageSource.Url:
var downloadedData = await DownloadCache.GetAsync(path, Parameters.CacheDuration).ConfigureAwait(false);
bytes = downloadedData.Bytes;
path = downloadedData.CachedPath;
break;
}
}
catch (Exception ex)
{
Logger.Error("Unable to retrieve image data", ex);
Parameters.OnError(ex);
return(null);
}
if (bytes == null)
{
return(null);
}
return(await Task.Run(() =>
{
if (CancellationToken.IsCancellationRequested)
{
return null;
}
// Special case to handle WebP decoding on iOS
if (sourcePath.ToLowerInvariant().EndsWith(".webp", StringComparison.InvariantCulture))
{
return new WebP.Touch.WebPCodec().Decode(bytes);
}
nfloat scale = _imageScale >= 1 ? _imageScale : _screenScale;
var image = new UIImage(NSData.FromArray(bytes), scale);
if (Parameters.Transformations != null && Parameters.Transformations.Count > 0)
{
foreach (var transformation in Parameters.Transformations)
{
try
{
var bitmapHolder = transformation.Transform(new BitmapHolder(image));
image = bitmapHolder.ToNative();
}
catch (Exception ex)
{
Logger.Error("Can't apply transformation " + transformation.Key + " to image " + path, ex);
}
}
}
return image;
}).ConfigureAwait(false));
}
