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namespace Nancy.Localization
{
using System;
using System.Collections.Generic;
using System.Linq;
using System.Resources;
/// <summary>
/// Resource based implementation of <see cref="ITextResource"/>
/// </summary>
public class ResourceBasedTextResource : ITextResource
{
private readonly IAssemblyProvider assemblyProvider;
private readonly IDictionary<string, ResourceManager> resourceManagers;
/// <summary>
/// Initializes a new instance of <see cref="ResourceBasedTextResource"/> to read strings from *.resx files
/// </summary>
public ResourceBasedTextResource(IAssemblyProvider assemblyProvider)
{
this.assemblyProvider = assemblyProvider;
var resources =
from assembly in this.assemblyProvider.GetAssembliesToScan()
from resourceName in assembly.GetManifestResourceNames()
where resourceName.EndsWith(".resources")
let parts = resourceName.Split(new[] { '.' })
let name = parts[parts.Length - 2]
let baseName = resourceName.Replace(".resources", string.Empty)
select new
{
Name = name,
Manager = new ResourceManager(baseName, assembly)
};
this.resourceManagers =
resources.ToDictionary(x => x.Name, x => x.Manager, StringComparer.OrdinalIgnoreCase);
}
/// <summary>
/// Used to return a string value from *.resx files
/// </summary>
/// <param name="key">The key to look for in the resource file</param>
/// <param name="context">The <see cref="NancyContext"/> used to determine the culture for returning culture specific values.</param>
/// <returns>Returns a string value from culture specific or default file or null if key does not exist as determined by <see cref="ResourceManager"/>.</returns>
public string this[string key, NancyContext context]
{
get
{
var components =
GetKeyComponents(key);
var manager = this.resourceManagers.ContainsKey(components.Item1) ?
this.resourceManagers[components.Item1] :
null;
return (manager == null) ? null : manager.GetString(components.Item2, context.Culture);
}
}
private static Tuple<string, string> GetKeyComponents(string key)
{
var index =
key.IndexOf(".", StringComparison.InvariantCulture);
if (index == -1)
{
throw new InvalidOperationException("The text key needs to be specified in the format resourcename.resourcekey.");
}
return new Tuple<string, string>(
key.Substring(0, index),
key.Substring(index + 1));
}
}
}
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