GtkSharp/glib/ListBase.cs

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// ListBase.cs - List base class implementation
//
// Authors: Mike Kestner <mkestner@novell.com>
//
// Copyright (c) 2002 Mike Kestner
// Copyright (c) 2005 Novell, Inc.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 2 of the Lesser GNU General
// Public License as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this program; if not, write to the
// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
namespace GLib {
using System;
using System.Collections;
using System.Runtime.InteropServices;
public abstract class ListBase : IDisposable, ICollection, GLib.IWrapper, ICloneable {
private IntPtr list_ptr = IntPtr.Zero;
private int length = -1;
private bool managed = false;
internal bool elements_owned = false;
protected System.Type element_type = null;
abstract internal IntPtr NthData (uint index);
abstract internal int Length (IntPtr list);
abstract internal void Free (IntPtr list);
abstract internal IntPtr Append (IntPtr current, IntPtr raw);
abstract internal IntPtr Prepend (IntPtr current, IntPtr raw);
internal ListBase (IntPtr list, System.Type element_type, bool owned, bool elements_owned)
{
list_ptr = list;
this.element_type = element_type;
managed = owned;
this.elements_owned = elements_owned;
}
~ListBase ()
{
Dispose (false);
}
[Obsolete ("Replaced by owned parameter on ctor.")]
public bool Managed {
set { managed = value; }
}
public IntPtr Handle {
get {
return list_ptr;
}
}
public void Append (IntPtr raw)
{
list_ptr = Append (list_ptr, raw);
}
public void Append (string item)
{
this.Append (Marshaller.StringToPtrGStrdup (item));
}
public void Append (object item)
{
this.Append (AllocNativeElement (item));
}
public void Prepend (IntPtr raw)
{
list_ptr = Prepend (list_ptr, raw);
}
// ICollection
public int Count {
get {
if (length == -1)
length = Length (list_ptr);
return length;
}
}
public object this [int index] {
get {
IntPtr data = NthData ((uint) index);
object ret = null;
ret = DataMarshal (data);
return ret;
}
}
// Synchronization could be tricky here. Hmm.
public bool IsSynchronized {
get { return false; }
}
public object SyncRoot {
get { return null; }
}
public void CopyTo (Array array, int index)
{
object[] orig = new object[Count];
int i = 0;
foreach (object o in this)
orig [i++] = o;
orig.CopyTo (array, index);
}
public class FilenameString {
private FilenameString () {}
}
IntPtr AllocNativeElement (object element)
{
if (element_type == null) {
if (element is IWrapper)
return (element as IWrapper).Handle;
else
return (IntPtr) GCHandle.Alloc (element);
} else {
if (element_type == typeof (string))
return Marshaller.StringToPtrGStrdup (element as string);
else if (element_type == typeof (FilenameString))
return Marshaller.StringToFilenamePtr (element as string);
else if (element_type == typeof (IntPtr))
return (IntPtr) GCHandle.Alloc (element);
else if (typeof (IWrapper).IsAssignableFrom (element_type))
return (element as IWrapper).Handle;
else if (element_type == typeof (int))
return new IntPtr ((int) element);
else if (element_type.IsValueType)
return Marshaller.StructureToPtrAlloc (element);
}
return IntPtr.Zero;
}
internal object DataMarshal (IntPtr data)
{
object ret = null;
if (element_type != null) {
if (element_type == typeof (string))
ret = Marshaller.Utf8PtrToString (data);
else if (element_type == typeof (FilenameString))
ret = Marshaller.FilenamePtrToString (data);
else if (element_type == typeof (IntPtr))
ret = data;
else if (element_type.IsSubclassOf (typeof (GLib.Object)))
ret = GLib.Object.GetObject (data, false);
else if (element_type.IsSubclassOf (typeof (GLib.Opaque)))
ret = GLib.Opaque.GetOpaque (data, element_type, elements_owned);
else if (element_type == typeof (int))
ret = (int) data;
else if (element_type.IsValueType)
ret = Marshal.PtrToStructure (data, element_type);
else if (element_type.IsInterface) {
Type adapter_type = element_type.Assembly.GetType (InterfaceToAdapterTypeName (element_type));
System.Reflection.MethodInfo method = adapter_type.GetMethod ("GetObject", new Type[] {typeof(IntPtr), typeof(bool)});
ret = method.Invoke (null, new object[] {data, false});
} else
ret = Activator.CreateInstance (element_type, new object[] {data});
} else if (Object.IsObject (data))
ret = GLib.Object.GetObject (data, false);
return ret;
}
static string InterfaceToAdapterTypeName (Type type)
{
string fullname = type.Namespace;
if (!String.IsNullOrEmpty (fullname)) {
fullname += ".";
}
fullname += type.Name.Substring (1); // IActivatable -> Activatable
return fullname + "Adapter";
}
[DllImport (Global.GObjectNativeDll, CallingConvention = CallingConvention.Cdecl)]
static extern void g_object_unref (IntPtr item);
public void Empty ()
{
if (elements_owned) {
for (uint i = 0; i < Count; i++) {
if (typeof (GLib.Opaque).IsAssignableFrom (element_type)) {
GLib.Opaque.GetOpaque (NthData (i), element_type, true).Dispose ();
} else if (typeof (GLib.IWrapper).IsAssignableFrom (element_type)) {
g_object_unref (NthData (i));
} else {
Marshaller.Free (NthData (i));
}
}
}
if (managed)
FreeList ();
}
IntPtr GetData (IntPtr current)
{
// data field is at offset 0 for GList and GSList
return Marshal.ReadIntPtr (current);
}
IntPtr Next (IntPtr current)
{
// next field follows gpointer data field for GList and GSList
return Marshal.ReadIntPtr (current, IntPtr.Size);
}
private class ListEnumerator : IEnumerator
{
private IntPtr current = IntPtr.Zero;
private ListBase list;
public ListEnumerator (ListBase list)
{
this.list = list;
}
public object Current {
get {
IntPtr data = list.GetData (current);
object ret = null;
ret = list.DataMarshal (data);
return ret;
}
}
public bool MoveNext ()
{
if (current == IntPtr.Zero)
current = list.list_ptr;
else
current = list.Next (current);
return (current != IntPtr.Zero);
}
public void Reset ()
{
current = IntPtr.Zero;
}
}
// IEnumerable
public IEnumerator GetEnumerator ()
{
return new ListEnumerator (this);
}
// IDisposable
public void Dispose ()
{
Dispose (true);
GC.SuppressFinalize (this);
}
protected virtual void Dispose (bool disposing)
{
Empty ();
}
void FreeList ()
{
if (list_ptr != IntPtr.Zero)
Free (list_ptr);
list_ptr = IntPtr.Zero;
length = -1;
}
// ICloneable
abstract public object Clone ();
}
}