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// System.MonoCustomAttrs.cs
// Hooks into the runtime to get custom attributes for reflection handles
//
// Paolo Molaro (lupus@ximian.com)
//
// (c) 2002 Ximian, Inc.
using System;
using System.Reflection;
using System.Collections;
using System.Runtime.CompilerServices;
namespace System {
internal class MonoCustomAttrs {
static Hashtable handle_to_attrs = new Hashtable ();
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal static extern object[] GetCustomAttributes (ICustomAttributeProvider obj);
private static object[] from_cache (ICustomAttributeProvider obj) {
object[] res = (object[])handle_to_attrs [obj];
if (res != null)
return res;
res = GetCustomAttributes (obj);
handle_to_attrs.Add (obj, res);
return res;
}
internal static object[] GetCustomAttributes (ICustomAttributeProvider obj, Type attributeType, bool inherit) {
object[] res = from_cache (obj);
// shortcut
if (res.Length == 1 && res[0].GetType () == attributeType)
return (object[])res.Clone ();
ArrayList a = new ArrayList ();
Type btype = obj as Type;
do {
foreach (object attr in res) {
if (attributeType.Equals (attr.GetType ()))
a.Add (attr);
}
if (btype != null && ((btype = btype.BaseType) != null)) {
res = from_cache (btype);
} else {
break;
}
} while (inherit && btype != null && ((btype = btype.BaseType) != null));
Attribute[] r = new Attribute [a.Count];
a.CopyTo (r);
return r;
}
internal static object[] GetCustomAttributes (ICustomAttributeProvider obj, bool inherit) {
Type btype = obj as Type;
if (!inherit || btype == null) {
return (Object[])from_cache (obj).Clone ();
} else {
ArrayList a = new ArrayList ();
a.AddRange (from_cache (obj));
while ((btype = btype.BaseType) != null) {
a.AddRange (from_cache (btype));
}
Attribute[] r = new Attribute [a.Count];
a.CopyTo (r);
return (object[])r;
}
}
internal static bool IsDefined (ICustomAttributeProvider obj, Type attributeType, bool inherit) {
object[] res = from_cache (obj);
foreach (object attr in res) {
if (attributeType.Equals (attr.GetType ()))
return true;
}
Type btype = obj as Type;
if (inherit && (btype != null) && ((btype = btype.BaseType) != null))
return IsDefined (btype, attributeType, inherit);
return false;
}
}
}
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