//  Copyright (c) Microsoft Corporation, 2001
//
//  File:     ContentFileHelper.cs
//
//------------------------------------------------------------------------------
 
using System;
using System.Reflection;
using System.Windows.Resources;
using System.Windows.Navigation;
using System.Collections.Generic;
 
namespace MS.Internal.Resources
{
    // <summary>
    //  ContentFileHelper class provides helper method to get assembly 
    //  associated content files.
    // </summary>
    internal static class ContentFileHelper
    {
        internal static bool IsContentFile(string partName)
        {
            if (_contentFiles == null)
            {
                _contentFiles = GetContentFiles(BaseUriHelper.ResourceAssembly);
            }
 
            if (_contentFiles != null && _contentFiles.Count > 0)
            {                
                if (_contentFiles.ContainsKey(partName))
                {
                    return true;
                }
            }
            
            return false;
        }
        
        //
        // Get a list of Content Files for a given Assembly.
        //
        static internal Dictionary<string, string> GetContentFiles(Assembly asm)
        {
            Dictionary<string, string> contentFiles = null;
 
            Attribute[] assemblyAttributes;
 
            if (asm == null)
            {
                asm = BaseUriHelper.ResourceAssembly;
                if (asm == null)
                {
                    // If we have no entry assembly return an empty list because
                    // we can't have any content files.
                    return new Dictionary<string, string>();
                }
            }
 
            assemblyAttributes = Attribute.GetCustomAttributes(
                                   asm,
                                   typeof(AssemblyAssociatedContentFileAttribute));
 
            if (assemblyAttributes != null && assemblyAttributes.Length > 0)
            {
                contentFiles = new Dictionary<string, string>(assemblyAttributes.Length, StringComparer.OrdinalIgnoreCase);
 
                for (int i=0; i<assemblyAttributes.Length; i++)
                {
                    AssemblyAssociatedContentFileAttribute aacf;
 
                    aacf = (AssemblyAssociatedContentFileAttribute) assemblyAttributes[i];
                    contentFiles.Add(aacf.RelativeContentFilePath, null);
                }
            }
 
            return contentFiles;
        }
 
        private static Dictionary<string, string> _contentFiles;
    }
}