/// <summary>
/// Gets the file data for the specified resource, storing a cached version if specified.
/// IMPORTANT:
/// NOTE: Make sure any and all await calls inside this function and its children
/// use ConfigureAwait(false). This is because the parent has to support
/// a synchronous version of this call, so the method cannot sync back with
/// its calling context without risk of deadlock.
/// </summary>
/// <param name="pathFormat">The path to the desired resource, containing {0} in place of the culture</param>
/// <param name="constructData">The function that takes the file data and converts it into the format required by the provider</param>
/// <param name="culture">The culture to use. If not specified, the default culture is used</param>
/// <returns></returns>
protected async Task <T> GetResourceDocumentAsync <T>(ResourceDefinition pathFormat, Func <Stream, T> constructData, string culture = null)
{
try
{
await mSelfLock.WaitAsync();
// Get culture path
var resourcePath = ResourceFormatProviderHelpers.GetCulturePath(pathFormat.Location, culture);
// Make sure list has been initialized
if (mCache == null)
{
mCache = new Dictionary <string, object>();
}
// If we have a document already, return that
if (mCache.ContainsKey(resourcePath))
{
return((T)mCache[resourcePath]);
}
// Otherwise try and get it
var resourceDocument = default(T);
try
{
// Try to get the stream for this resource
using (var stream = await ResourceFormatProviderHelpers.GetStreamAsync(pathFormat.Type, resourcePath).ConfigureAwait(false))
{
// If successful, try and convert that data into a usable resource object
if (stream != null)
{
resourceDocument = constructData(stream);
}
}
}
finally
{
// Add resource document if found or not (except for Urls, never add failed Urls in case of bad Internet connection
if (mCacheResourceFiles && pathFormat.Type != ResourceDefinitionType.Url)
{
mCache.Add(resourcePath, resourceDocument);
}
}
// Return what we found, if anything
return(resourceDocument);
}
finally
{
mSelfLock.Release();
}
}
/// <summary>
/// Gets the format of this resource
/// </summary>
/// <param name="resourceDefinition">The resource definition</param>
/// <returns></returns>
public static string GetFormat(ResourceDefinition resourceDefinition)
{
var extension = resourceDefinition.ExplicitFormat;
// If not, get it from the file extension
if (string.IsNullOrEmpty(resourceDefinition.ExplicitFormat))
{
extension = Path.GetExtension(resourceDefinition.Location);
if (extension != null && extension.StartsWith("."))
{
extension = extension.Substring(1);
}
}
return(extension);
}
/// <summary>
/// Finds a string of the given name, taking into account the culture information.
/// If no culture is specified, the default culture is used
///
/// IMPORTANT:
/// NOTE: Make sure any and all await calls inside this function and its children
/// use ConfigureAwait(false). This is because the parent has to support
/// a synchronous version of this call, so the method cannot sync back with
/// its calling context without risk of deadlock.
/// </summary>
public async Task <bool> GetStringAsync(ResourceDefinition resource, string name, string culture, Action <string> onResult)
{
// Get string document for this culture
var document = await GetResourceDocumentAsync(resource, XDocument.Load, culture).ConfigureAwait(false);
// If it is null, try and find the default culture if specified
if (document == null)
{
if (resource.UseDefaultCultureIfNotFound)
{
document = await GetResourceDocumentAsync(resource, XDocument.Load).ConfigureAwait(false);
}
// Document not found so return false
if (document == null)
{
return(false);
}
}
// Null check for root document
if (document.Root == null)
{
return(false);
}
// Get the first element that matches the given name (ignore case)
var element = document.Root.Elements().FirstOrDefault(
f => f.Attributes().Any(a => a.Name.LocalName == "Name") &&
string.Equals(name, f.Attributes().First(a => a.Name.LocalName == "Name").Value, StringComparison.CurrentCultureIgnoreCase));
// Return false if not found
if (element == null)
{
return(false);
}
// Otherwise we found the value so return it
onResult(element.Value);
return(true);
}
