@ -15,26 +15,6 @@ namespace Perspex.Shared.PlatformSupport
/// </summary>
/// </summary>
public class AssetLoader : IAssetLoader public class AssetLoader : IAssetLoader
{ {
class AssemblyDescriptor
{
public AssemblyDescriptor ( Assembly assembly )
{
Assembly = assembly ;
if ( assembly ! = null )
{
Resources = assembly . GetManifestResourceNames ( )
. ToDictionary ( n = > n , n = > ( IAssetDescriptor ) new AssemblyResourceDescriptor ( assembly , n ) ) ;
Name = assembly . GetName ( ) . Name ;
}
}
public Assembly Assembly { get ; }
public Dictionary < string , IAssetDescriptor > Resources { get ; }
public string Name { get ; }
}
private static readonly Dictionary < string , AssemblyDescriptor > AssemblyNameCache private static readonly Dictionary < string , AssemblyDescriptor > AssemblyNameCache
= new Dictionary < string , AssemblyDescriptor > ( ) ; = new Dictionary < string , AssemblyDescriptor > ( ) ;
@ -53,7 +33,94 @@ namespace Perspex.Shared.PlatformSupport
_d efaultAssembly = new AssemblyDescriptor ( assembly ) ; _d efaultAssembly = new AssemblyDescriptor ( assembly ) ;
} }
AssemblyDescriptor GetAssembly ( string name ) /// <summary>
/// Checks if an asset with the specified URI exists.
/// </summary>
/// <param name="uri">The URI.</param>
/// <param name="baseUri">
/// A base URI to use if <paramref name="uri"/> is relative.
/// </param>
/// <returns>True if the asset could be found; otherwise false.</returns>
public bool Exists ( Uri uri , Uri baseUri = null )
{
return GetAsset ( uri , baseUri ) ! = null ;
}
/// <summary>
/// Opens the resource with the requested URI.
/// </summary>
/// <param name="uri">The URI.</param>
/// <param name="baseUri">
/// A base URI to use if <paramref name="uri"/> is relative.
/// </param>
/// <returns>A stream containing the resource contents.</returns>
/// <exception cref="FileNotFoundException">
/// The resource was not found.
/// </exception>
public Stream Open ( Uri uri , Uri baseUri = null )
{
var asset = GetAsset ( uri , baseUri ) ;
if ( asset = = null )
{
throw new FileNotFoundException ( $"The resource {uri} could not be found." ) ;
}
return asset . GetStream ( ) ;
}
private IAssetDescriptor GetAsset ( Uri uri , Uri baseUri )
{
if ( ! uri . IsAbsoluteUri | | uri . Scheme = = "resm" )
{
var uriQueryParams = ParseQueryString ( uri ) ;
var baseUriQueryParams = uri ! = null ? ParseQueryString ( uri ) : null ;
var asm = GetAssembly ( uri ) ? ? GetAssembly ( baseUri ) ? ? _d efaultAssembly ;
if ( asm = = null & & _d efaultAssembly = = null )
{
throw new ArgumentException (
"No default assembly, entry assembly or explicit assembly specified; " +
"don't know where to look up for the resource, try specifiyng assembly explicitly." ) ;
}
IAssetDescriptor rv ;
var resourceKey = uri . AbsolutePath ;
#if __IOS__
// TODO: HACK: to get iOS up and running. Using Shared projects for resources
// is flawed as this alters the reource key locations across platforms
// I think we need to use Portable libraries from now on to avoid that.
if ( asm . Name . Contains ( "iOS" ) )
{
resourceKey = resourceKey . Replace ( "TestApplication" , "Perspex.iOSTestApplication" ) ;
}
#endif
asm . Resources . TryGetValue ( resourceKey , out rv ) ;
return rv ;
}
throw new ArgumentException ( $"Invalid uri, see https://github.com/Perspex/Perspex/issues/282#issuecomment-166982104" , nameof ( uri ) ) ;
}
private AssemblyDescriptor GetAssembly ( Uri uri )
{
if ( uri ! = null )
{
var qs = ParseQueryString ( uri ) ;
string assemblyName ;
if ( qs . TryGetValue ( "assembly" , out assemblyName ) )
{
return GetAssembly ( assemblyName ) ;
}
}
return null ;
}
private AssemblyDescriptor GetAssembly ( string name )
{ {
if ( name = = null ) if ( name = = null )
{ {
@ -82,13 +149,20 @@ namespace Perspex.Shared.PlatformSupport
return rv ; return rv ;
} }
interface IAssetDescriptor private Dictionary < string , string > ParseQueryString ( Uri uri )
{ {
Stream GetStream ( ) ; return uri . Query . TrimStart ( '?' )
. Split ( new [ ] { '&' } , StringSplitOptions . RemoveEmptyEntries )
. Select ( p = > p . Split ( '=' ) )
. ToDictionary ( p = > p [ 0 ] , p = > p [ 1 ] ) ;
} }
private interface IAssetDescriptor
{
Stream GetStream ( ) ;
}
class AssemblyResourceDescriptor : IAssetDescriptor private class AssemblyResourceDescriptor : IAssetDescriptor
{ {
private readonly Assembly _ asm ; private readonly Assembly _ asm ;
private readonly string _ name ; private readonly string _ name ;
@ -104,69 +178,24 @@ namespace Perspex.Shared.PlatformSupport
return _ asm . GetManifestResourceStream ( _ name ) ; return _ asm . GetManifestResourceStream ( _ name ) ;
} }
} }
IAssetDescriptor GetAsset ( Uri uri ) private class AssemblyDescriptor
{ {
if ( ! uri . IsAbsoluteUri | | uri . Scheme = = "resm" ) public AssemblyDescriptor ( Assembly assembly )
{ {
var qs = uri . Query . TrimStart ( '?' ) Assembly = assembly ;
. Split ( new [ ] { '&' } , StringSplitOptions . RemoveEmptyEntries )
. Select ( p = > p . Split ( '=' ) )
. ToDictionary ( p = > p [ 0 ] , p = > p [ 1 ] ) ;
//TODO: Replace _defaultAssembly by current one (need support from OmniXAML)
var asm = _d efaultAssembly ;
if ( qs . ContainsKey ( "assembly" ) )
asm = GetAssembly ( qs [ "assembly" ] ) ;
if ( asm = = null & & _d efaultAssembly = = null )
throw new ArgumentException (
"No defaultAssembly, entry assembly or explicit assembly specified, don't know where to look up for the resource, try specifiyng assembly explicitly" ) ;
IAssetDescriptor rv ;
var resourceKey = uri . AbsolutePath ;
#if __IOS__
if ( assembly ! = null )
// TODO: HACK: to get iOS up and running. Using Shared projects for resources
// is flawed as this alters the reource key locations across platforms
// I think we need to use Portable libraries from now on to avoid that.
if ( asm . Name . Contains ( "iOS" ) )
{ {
resourceKey = resourceKey . Replace ( "TestApplication" , "Perspex.iOSTestApplication" ) ; Resources = assembly . GetManifestResourceNames ( )
. ToDictionary ( n = > n , n = > ( IAssetDescriptor ) new AssemblyResourceDescriptor ( assembly , n ) ) ;
Name = assembly . GetName ( ) . Name ;
} }
#endif
asm . Resources . TryGetValue ( resourceKey , out rv ) ;
return rv ;
} }
throw new ArgumentException ( $"Invalid uri, see https://github.com/Perspex/Perspex/issues/282#issuecomment-166982104" , nameof ( uri ) ) ;
}
/// <summary>
/// Checks if an asset with the specified URI exists.
/// </summary>
/// <param name="uri">The URI.</param>
/// <returns>True if the asset could be found; otherwise false.</returns>
public bool Exists ( Uri uri )
{
return GetAsset ( uri ) ! = null ;
}
/// <summary>
public Assembly Assembly { get ; }
/// Opens the resource with the requested URI.
public Dictionary < string , IAssetDescriptor > Resources { get ; }
/// </summary>
public string Name { get ; }
/// <param name="uri">The URI.</param>
/// <returns>A stream containing the resource contents.</returns>
/// <exception cref="FileNotFoundException">
/// The resource was not found.
/// </exception>
public Stream Open ( Uri uri )
{
var asset = GetAsset ( uri ) ;
if ( asset = = null )
throw new FileNotFoundException ( $"The resource {uri} could not be found." ) ;
return asset . GetStream ( ) ;
} }
} }
} }
Steven Kirk
10 years ago