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//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
namespace IceInternal
{
using System;
using System.Runtime.InteropServices;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
public sealed class AssemblyUtil
{
#if NET5_0 || NETSTANDARD2_0
public static readonly bool isWindows = RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
public static readonly bool isMacOS = RuntimeInformation.IsOSPlatform(OSPlatform.OSX);
public static readonly bool isLinux = RuntimeInformation.IsOSPlatform(OSPlatform.Linux);
public static readonly bool isMono = RuntimeInformation.FrameworkDescription.Contains("Mono");
#else
public static readonly bool isWindows = true;
public static readonly bool isMacOS = false;
public static readonly bool isLinux = false;
public static readonly bool isMono = false;
#endif
public static Type findType(Instance instance, string csharpId)
{
lock(_mutex)
{
Type t;
if (_typeTable.TryGetValue(csharpId, out t))
{
return t;
}
loadAssemblies(); // Lazy initialization
foreach (Assembly a in _loadedAssemblies.Values)
{
if((t = a.GetType(csharpId)) != null)
{
_typeTable[csharpId] = t;
return t;
}
}
}
return null;
}
public static Type[] findTypesWithPrefix(string prefix)
{
LinkedList<Type> l = new LinkedList<Type>();
lock(_mutex)
{
loadAssemblies(); // Lazy initialization
foreach(Assembly a in _loadedAssemblies.Values)
{
try
{
Type[] types = a.GetTypes();
foreach(Type t in types)
{
if(t.AssemblyQualifiedName.IndexOf(prefix, StringComparison.Ordinal) == 0)
{
l.AddLast(t);
}
}
}
catch(ReflectionTypeLoadException)
{
// Failed to load types from the assembly, ignore and continue
}
}
}
Type[] result = new Type[l.Count];
if(l.Count > 0)
{
l.CopyTo(result, 0);
}
return result;
}
public static object createInstance(Type t)
{
try
{
return Activator.CreateInstance(t);
}
catch(MemberAccessException)
{
return null;
}
}
public static void preloadAssemblies()
{
lock(_mutex)
{
loadAssemblies(); // Lazy initialization
}
}
//
// Make sure that all assemblies that are referenced by this process
// are actually loaded. This is necessary so we can use reflection
// on any type in any assembly because the type we are after will
// most likely not be in the current assembly and, worse, may be
// in an assembly that has not been loaded yet. (Type.GetType()
// is no good because it looks only in the calling object's assembly
// and mscorlib.dll.)
//
private static void loadAssemblies()
{
Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();
List<Assembly> newAssemblies = null;
foreach(Assembly a in assemblies)
{
if(!_loadedAssemblies.Contains(a.FullName))
{
if(newAssemblies == null)
{
newAssemblies = new List<Assembly>();
}
newAssemblies.Add(a);
_loadedAssemblies[a.FullName] = a;
}
}
if(newAssemblies != null)
{
foreach(Assembly a in newAssemblies)
{
loadReferencedAssemblies(a);
}
}
}
private static void loadReferencedAssemblies(Assembly a)
{
try
{
AssemblyName[] names = a.GetReferencedAssemblies();
foreach(AssemblyName name in names)
{
if(!_loadedAssemblies.ContainsKey(name.FullName))
{
try
{
Assembly ra = Assembly.Load(name);
//
// The value of name.FullName may not match that of ra.FullName, so
// we record the assembly using both keys.
//
_loadedAssemblies[name.FullName] = ra;
_loadedAssemblies[ra.FullName] = ra;
loadReferencedAssemblies(ra);
}
catch(Exception)
{
// Ignore assemblies that cannot be loaded.
}
}
}
}
catch(PlatformNotSupportedException)
{
// Some platforms like UWP do not support using GetReferencedAssemblies
}
}
private static Hashtable _loadedAssemblies = new Hashtable(); // <string, Assembly> pairs.
private static Dictionary<string, Type> _typeTable = new Dictionary<string, Type>(); // <type name, Type> pairs.
private static object _mutex = new object();
}
}
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