DefaultResourceProvider.cs :  » 2.6.4-mono-.net-core » System.Web » System » Web » Compilation » C# / CSharp Open Source

// DefaultResourceProvider.cs
//
// Authors:
//  Marek Habersack (mhabersack@novell.com)
//
// (C) 2009 Novell, Inc (http://novell.com)

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Resources;
using System.Reflection;
using System.Web;

namespace System.Web.Compilation{
  sealed class DefaultResourceProvider : IResourceProvider
  {
    sealed class ResourceManagerCacheKey
    {
      readonly string _name;
      readonly Assembly _asm;

      public ResourceManagerCacheKey (string name, Assembly asm)
      {
        _name = name;
        _asm = asm;
      }

      public override bool Equals (object obj)
      {
        if (!(obj is ResourceManagerCacheKey))
          return false;
        ResourceManagerCacheKey key = (ResourceManagerCacheKey) obj;
        return key._asm == _asm && _name.Equals (key._name, StringComparison.Ordinal);
      }

      public override int GetHashCode ()
      {
        return _name.GetHashCode () + _asm.GetHashCode ();
      }
    }
    
    [ThreadStatic]
    static Dictionary <ResourceManagerCacheKey, ResourceManager> resourceManagerCache;
    
    string resource;
    bool isGlobal;
    
    public IResourceReader ResourceReader {
      get {
        Assembly asm;
        string path;
          
        if (isGlobal) {
          asm = HttpContext.AppGlobalResourcesAssembly;
          path = resource;
        } else {
          asm = GetLocalResourcesAssembly ();
          path = Path.GetFileName (resource);

          if (String.IsNullOrEmpty (path))
            return null;

          path += ".resources";
        }
              
        if (asm == null)
          return null;

        Stream ms = asm.GetManifestResourceStream (path);
        if (ms == null)
          return null;
        
        return new ResourceReader (ms);
      }
    }
    
    public DefaultResourceProvider (string resource, bool isGlobal)
    {
      if (String.IsNullOrEmpty (resource))
        throw new ArgumentNullException ("resource");
      
      this.resource = resource;
      this.isGlobal = isGlobal;
    }

    public object GetObject (string resourceKey, CultureInfo culture)
    {
       if (String.IsNullOrEmpty (resourceKey))
        return null;
      
      ResourceManager rm = GetResourceManager ();
      if (rm == null)
        return null;

      return rm.GetObject (resourceKey, culture);
    }

    Assembly GetLocalResourcesAssembly ()
    {
      string path;
      Assembly asm;

      path = VirtualPathUtility.GetDirectory (resource);
      asm = AppResourcesCompiler.GetCachedLocalResourcesAssembly (path);
      if (asm == null) {
        AppResourcesCompiler ac = new AppResourcesCompiler (path);
        asm = ac.Compile ();
        if (asm == null)
          throw new MissingManifestResourceException ("A resource object was not found at the specified virtualPath.");
      }

      return asm;
    }
    
    ResourceManager GetResourceManager ()
    {
      string path;
      Assembly asm;

      if (isGlobal) {
        asm = HttpContext.AppGlobalResourcesAssembly;
        path = resource;
      } else {
        asm = GetLocalResourcesAssembly ();
        path = Path.GetFileName (resource);

        if (String.IsNullOrEmpty (path))
          return null;
      }

      if (asm == null)
        return null;
      
      ResourceManager rm;
      try {
        if (resourceManagerCache == null)
          resourceManagerCache = new Dictionary <ResourceManagerCacheKey, ResourceManager> ();
        
        ResourceManagerCacheKey key = new ResourceManagerCacheKey (path, asm);
        if (!resourceManagerCache.TryGetValue (key, out rm)) {
          rm = new ResourceManager (path, asm);
          rm.IgnoreCase = true;
          resourceManagerCache.Add (key, rm);
        }
        
        return rm;
      } catch (MissingManifestResourceException) {
        throw;
      } catch (Exception ex) {
        throw new HttpException ("Failed to retrieve the specified global resource object.", ex);
      }
    }
  }
}