a76f60df81
This patch adds TypeName attribute which can be used on custom class derived from GLib.Object in order to set GLib type name of the class.
467 lines
15 KiB
C#
467 lines
15 KiB
C#
// GLib.Type.cs - GLib GType class implementation
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//
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// Authors: Mike Kestner <mkestner@speakeasy.net>
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// Andres G. Aragoneses <knocte@gmail.com>
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//
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// Copyright (c) 2003 Mike Kestner
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// Copyright (c) 2003 Novell, Inc.
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// Copyright (c) 2013 Andres G. Aragoneses
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of version 2 of the Lesser GNU General
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// Public License as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this program; if not, write to the
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// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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namespace GLib {
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Reflection;
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using System.Runtime.InteropServices;
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using System.Text;
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public delegate System.Type TypeResolutionHandler (GLib.GType gtype, string gtype_name);
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[StructLayout(LayoutKind.Sequential)]
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public struct GType {
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IntPtr val;
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[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
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internal delegate void ClassInitDelegate (IntPtr gobject_class_handle);
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struct GTypeInfo {
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public ushort class_size;
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public IntPtr base_init;
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public IntPtr base_finalize;
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public ClassInitDelegate class_init;
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public IntPtr class_finalize;
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public IntPtr class_data;
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public ushort instance_size;
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public ushort n_preallocs;
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public IntPtr instance_init;
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public IntPtr value_table;
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}
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struct GTypeQuery {
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public IntPtr type;
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public IntPtr type_name;
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public uint class_size;
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public uint instance_size;
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}
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public GType (IntPtr val)
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{
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this.val = val;
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}
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public static GType FromName (string native_name)
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{
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return new GType (g_type_from_name (native_name));
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}
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public static readonly GType Invalid = new GType ((IntPtr) TypeFundamentals.TypeInvalid);
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public static readonly GType None = new GType ((IntPtr) TypeFundamentals.TypeNone);
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public static readonly GType Interface = new GType ((IntPtr) TypeFundamentals.TypeInterface);
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public static readonly GType Char = new GType ((IntPtr) TypeFundamentals.TypeChar);
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public static readonly GType UChar = new GType ((IntPtr) TypeFundamentals.TypeUChar);
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public static readonly GType Boolean = new GType ((IntPtr) TypeFundamentals.TypeBoolean);
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public static readonly GType Int = new GType ((IntPtr) TypeFundamentals.TypeInt);
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public static readonly GType UInt = new GType ((IntPtr) TypeFundamentals.TypeUInt);
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public static readonly GType Long = new GType ((IntPtr) TypeFundamentals.TypeLong);
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public static readonly GType ULong = new GType ((IntPtr) TypeFundamentals.TypeULong);
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public static readonly GType Int64 = new GType ((IntPtr) TypeFundamentals.TypeInt64);
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public static readonly GType UInt64 = new GType ((IntPtr) TypeFundamentals.TypeUInt64);
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public static readonly GType Enum = new GType ((IntPtr) TypeFundamentals.TypeEnum);
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public static readonly GType Flags = new GType ((IntPtr) TypeFundamentals.TypeFlags);
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public static readonly GType Float = new GType ((IntPtr) TypeFundamentals.TypeFloat);
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public static readonly GType Double = new GType ((IntPtr) TypeFundamentals.TypeDouble);
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public static readonly GType String = new GType ((IntPtr) TypeFundamentals.TypeString);
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public static readonly GType Pointer = new GType ((IntPtr) TypeFundamentals.TypePointer);
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public static readonly GType Boxed = new GType ((IntPtr) TypeFundamentals.TypeBoxed);
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public static readonly GType Param = new GType ((IntPtr) TypeFundamentals.TypeParam);
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public static readonly GType Object = new GType ((IntPtr) TypeFundamentals.TypeObject);
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public static readonly GType Variant = new GType ((IntPtr) TypeFundamentals.TypeVariant);
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static HashSet<GType> managedTypes = new HashSet<GType> ();
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static IDictionary<IntPtr, Type> types = new Dictionary<IntPtr, Type> ();
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static IDictionary<Type, GType> gtypes = new Dictionary<Type, GType> ();
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public static void Register (GType native_type, System.Type type)
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{
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Register (native_type, type, false);
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}
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public static void Register (GType native_type, System.Type type, bool managed)
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{
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lock (types) {
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if (native_type != GType.Pointer && native_type != GType.Boxed && native_type != ManagedValue.GType)
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types[native_type.Val] = type;
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if (type != null)
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gtypes[type] = native_type;
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if (managed)
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managedTypes.Add(native_type);
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}
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}
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public static bool IsManaged (GType gtype)
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{
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return managedTypes.Contains(gtype);
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}
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static GType ()
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{
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g_type_init ();
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Register (GType.Char, typeof (sbyte));
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Register (GType.UChar, typeof (byte));
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Register (GType.Boolean, typeof (bool));
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Register (GType.Int, typeof (int));
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Register (GType.UInt, typeof (uint));
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Register (GType.Int64, typeof (long));
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Register (GType.UInt64, typeof (ulong));
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Register (GType.Float, typeof (float));
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Register (GType.Double, typeof (double));
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Register (GType.String, typeof (string));
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Register (GType.Pointer, typeof (IntPtr));
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Register (GType.Object, typeof (GLib.Object));
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Register (GType.Pointer, typeof (IntPtr));
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Register (GType.Variant, typeof (GLib.Variant));
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// One-way mapping
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gtypes[typeof (char)] = GType.UInt;
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}
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public static explicit operator GType (System.Type type)
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{
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GType gtype;
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lock (types) {
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if (gtypes.ContainsKey (type))
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return gtypes[type];
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}
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if (type.IsSubclassOf (typeof (GLib.Object))) {
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gtype = GLib.Object.LookupGType (type);
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Register (gtype, type);
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return gtype;
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}
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PropertyInfo pi = type.GetProperty ("GType", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.FlattenHierarchy);
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if (pi != null)
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gtype = (GType) pi.GetValue (null, null);
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else if (type.IsDefined (typeof (GTypeAttribute), false)) {
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GTypeAttribute gattr = (GTypeAttribute)Attribute.GetCustomAttribute (type, typeof (GTypeAttribute), false);
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pi = gattr.WrapperType.GetProperty ("GType", BindingFlags.Public | BindingFlags.Static);
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gtype = (GType) pi.GetValue (null, null);
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} else if (type.IsSubclassOf (typeof (GLib.Opaque)))
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gtype = GType.Pointer;
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else
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gtype = ManagedValue.GType;
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Register (gtype, type);
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return gtype;
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}
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static string GetQualifiedName (string cname)
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{
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if (string.IsNullOrEmpty (cname))
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return null;
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for (int i = 1; i < cname.Length; i++) {
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if (System.Char.IsUpper (cname[i])) {
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if (i == 1 && cname [0] == 'G')
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return "GLib." + cname.Substring (1);
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else
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return cname.Substring (0, i) + "." + cname.Substring (i);
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}
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}
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return null;
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}
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public static explicit operator Type (GType gtype)
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{
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return LookupType (gtype.Val);
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}
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public static void Init ()
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{
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// cctor already calls g_type_init.
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}
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public static event TypeResolutionHandler ResolveType;
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public static Type LookupType (IntPtr typeid)
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{
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lock (types) {
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if (types.ContainsKey (typeid))
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return types[typeid];
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}
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string native_name = Marshaller.Utf8PtrToString (g_type_name (typeid));
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if (ResolveType != null) {
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GLib.GType gt = new GLib.GType (typeid);
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Delegate[] invocation_list = ResolveType.GetInvocationList ();
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foreach (Delegate d in invocation_list) {
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TypeResolutionHandler handler = (TypeResolutionHandler) d;
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System.Type tmp = handler (gt, native_name);
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if (tmp != null) {
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Register (gt, tmp);
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return tmp;
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}
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}
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}
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string type_name = GetQualifiedName (native_name);
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if (type_name == null)
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return null;
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Type result = null;
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Assembly[] assemblies = (Assembly[]) AppDomain.CurrentDomain.GetAssemblies ().Clone ();
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foreach (Assembly asm in assemblies) {
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result = asm.GetType (type_name);
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if (result != null)
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break;
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}
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if (result == null) {
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// Because of lazy loading of references, it's possible the type's assembly
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// needs to be loaded. We will look for it by name in the references of
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// the currently loaded assemblies. Hopefully a recursive traversal is
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// not needed. We avoid one for now because of problems experienced
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// in a patch from bug #400595, and a desire to keep memory usage low
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// by avoiding a complete loading of all dependent assemblies.
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string ns = type_name.Substring (0, type_name.LastIndexOf ('.'));
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string asm_name = ns.ToLower ().Replace ('.', '-') + "-sharp";
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foreach (Assembly asm in assemblies) {
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foreach (AssemblyName ref_name in asm.GetReferencedAssemblies ()) {
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if (ref_name.Name != asm_name)
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continue;
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try {
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string asm_dir = Path.GetDirectoryName (asm.Location);
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Assembly ref_asm;
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if (File.Exists (Path.Combine (asm_dir, ref_name.Name + ".dll")))
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ref_asm = Assembly.LoadFrom (Path.Combine (asm_dir, ref_name.Name + ".dll"));
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else
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ref_asm = Assembly.Load (ref_name);
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result = ref_asm.GetType (type_name);
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if (result != null)
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break;
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} catch (Exception) {
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/* Failure to load a referenced assembly is not an error */
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}
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}
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if (result != null)
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break;
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}
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}
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Register (new GType (typeid), result);
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return result;
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}
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public IntPtr Val {
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get { return val; }
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}
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public static bool operator == (GType a, GType b)
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{
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return a.Val == b.Val;
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}
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public static bool operator != (GType a, GType b)
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{
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return a.Val != b.Val;
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}
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public override bool Equals (object o)
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{
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if (!(o is GType))
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return false;
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return ((GType) o) == this;
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}
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public override int GetHashCode ()
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{
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return val.GetHashCode ();
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}
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public override string ToString ()
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{
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return Marshaller.Utf8PtrToString (g_type_name (val));
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}
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public IntPtr GetClassPtr ()
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{
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IntPtr klass = g_type_class_peek (val);
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if (klass == IntPtr.Zero)
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klass = g_type_class_ref (val);
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return klass;
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}
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public IntPtr GetDefaultInterfacePtr ()
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{
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IntPtr klass = g_type_default_interface_peek (val);
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if (klass == IntPtr.Zero)
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klass = g_type_default_interface_ref (val);
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return klass;
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}
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public GType GetBaseType ()
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{
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IntPtr parent = g_type_parent (this.Val);
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return parent == IntPtr.Zero ? GType.None : new GType (parent);
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}
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public GType GetThresholdType ()
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{
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GType curr_type = this;
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while (IsManaged (curr_type))
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curr_type = curr_type.GetBaseType ();
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return curr_type;
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}
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public uint GetClassSize ()
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{
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GTypeQuery query;
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g_type_query (this.Val, out query);
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return query.class_size;
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}
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internal void EnsureClass ()
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{
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if (g_type_class_peek (val) == IntPtr.Zero)
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g_type_class_ref (val);
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}
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static int type_uid;
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static string BuildEscapedName (System.Type t)
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{
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string qn = t.FullName;
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// Just a random guess
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StringBuilder sb = new StringBuilder (20 + qn.Length);
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sb.Append ("__gtksharp_");
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sb.Append (type_uid++);
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sb.Append ("_");
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foreach (char c in qn) {
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if ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
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sb.Append (c);
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else if (c == '.')
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sb.Append ('_');
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else if ((uint) c <= byte.MaxValue) {
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sb.Append ('+');
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sb.Append (((byte) c).ToString ("x2"));
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} else {
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sb.Append ('-');
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sb.Append (((uint) c).ToString ("x4"));
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}
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}
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return sb.ToString ();
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}
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internal static GType RegisterGObjectType (Object.ClassInitializer gobject_class_initializer)
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{
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GType parent_gtype = LookupGObjectType (gobject_class_initializer.Type.BaseType);
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TypeNameAttribute nattr = (TypeNameAttribute)Attribute.GetCustomAttribute (gobject_class_initializer.Type, typeof (TypeNameAttribute), false);
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string name = nattr != null ? nattr.Name : BuildEscapedName (gobject_class_initializer.Type);
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IntPtr native_name = GLib.Marshaller.StringToPtrGStrdup (name);
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GTypeQuery query;
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g_type_query (parent_gtype.Val, out query);
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GTypeInfo info = new GTypeInfo ();
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info.class_size = (ushort) query.class_size;
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info.instance_size = (ushort) query.instance_size;
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info.class_init = gobject_class_initializer.ClassInitManagedDelegate;
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GType gtype = new GType (g_type_register_static (parent_gtype.Val, native_name, ref info, 0));
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GLib.Marshaller.Free (native_name);
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Register (gtype, gobject_class_initializer.Type, true);
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return gtype;
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}
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internal static GType LookupGObjectType (System.Type t)
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{
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lock (types) {
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if (gtypes.ContainsKey (t))
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return gtypes [t];
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}
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PropertyInfo pi = t.GetProperty ("GType", BindingFlags.DeclaredOnly | BindingFlags.Static | BindingFlags.Public);
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if (pi != null)
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return (GType) pi.GetValue (null, null);
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return GLib.Object.RegisterGType (t);
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}
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internal static IntPtr ValFromInstancePtr (IntPtr handle)
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{
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if (handle == IntPtr.Zero)
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return IntPtr.Zero;
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// First field of instance is a GTypeClass*.
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IntPtr klass = Marshal.ReadIntPtr (handle);
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// First field of GTypeClass is a GType.
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return Marshal.ReadIntPtr (klass);
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}
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internal static bool Is (IntPtr type, GType is_a_type)
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{
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return g_type_is_a (type, is_a_type.Val);
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}
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public bool IsInstance (IntPtr raw)
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{
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return GType.Is (ValFromInstancePtr (raw), this);
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}
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[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
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static extern IntPtr g_type_class_peek (IntPtr gtype);
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[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
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static extern IntPtr g_type_class_ref (IntPtr gtype);
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[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
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static extern IntPtr g_type_default_interface_peek (IntPtr gtype);
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[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
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static extern IntPtr g_type_default_interface_ref (IntPtr gtype);
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[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
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static extern IntPtr g_type_from_name (string name);
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[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
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static extern void g_type_init ();
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[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
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static extern IntPtr g_type_name (IntPtr raw);
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[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
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static extern IntPtr g_type_parent (IntPtr type);
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[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
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static extern void g_type_query (IntPtr type, out GTypeQuery query);
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[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
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static extern IntPtr g_type_register_static (IntPtr parent, IntPtr name, ref GTypeInfo info, int flags);
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[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
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static extern bool g_type_is_a (IntPtr type, IntPtr is_a_type);
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}
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}
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