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279 lines
7 KiB
C#
279 lines
7 KiB
C#
// ListBase.cs - List base class implementation
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//
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// Authors: Mike Kestner <mkestner@novell.com>
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//
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// Copyright (c) 2002 Mike Kestner
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// Copyright (c) 2005 Novell, Inc.
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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 Gst.GLib {
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using System;
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using System.Collections;
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using System.Runtime.InteropServices;
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public abstract class ListBase : IDisposable, ICollection, Gst.GLib.IWrapper, ICloneable {
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private IntPtr list_ptr = IntPtr.Zero;
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private int length = -1;
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private bool managed = false;
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internal bool elements_owned = false;
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protected System.Type element_type = null;
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abstract internal IntPtr NthData (uint index);
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abstract internal int Length (IntPtr list);
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abstract internal void Free (IntPtr list);
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abstract internal IntPtr Append (IntPtr current, IntPtr raw);
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abstract internal IntPtr Prepend (IntPtr current, IntPtr raw);
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internal ListBase (IntPtr list, System.Type element_type, bool owned, bool elements_owned)
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{
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list_ptr = list;
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this.element_type = element_type;
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managed = owned;
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this.elements_owned = elements_owned;
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}
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~ListBase ()
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{
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Dispose (false);
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}
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[Obsolete ("Replaced by owned parameter on ctor.")]
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public bool Managed {
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set { managed = value; }
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}
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public IntPtr Handle {
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get {
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return list_ptr;
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}
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}
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public void Append (IntPtr raw)
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{
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list_ptr = Append (list_ptr, raw);
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}
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public void Append (string item)
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{
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this.Append (Marshaller.StringToPtrGStrdup (item));
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}
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public void Append (object item)
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{
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this.Append (AllocNativeElement (item));
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}
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public void Prepend (IntPtr raw)
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{
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list_ptr = Prepend (list_ptr, raw);
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}
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// ICollection
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public int Count {
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get {
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if (length == -1)
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length = Length (list_ptr);
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return length;
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}
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}
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public object this [int index] {
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get {
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IntPtr data = NthData ((uint) index);
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object ret = null;
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ret = DataMarshal (data);
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return ret;
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}
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}
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// Synchronization could be tricky here. Hmm.
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public bool IsSynchronized {
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get { return false; }
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}
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public object SyncRoot {
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get { return null; }
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}
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public void CopyTo (Array array, int index)
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{
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object[] orig = new object[Count];
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int i = 0;
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foreach (object o in this)
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orig [i++] = o;
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orig.CopyTo (array, index);
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}
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public class FilenameString {
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private FilenameString () {}
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}
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IntPtr AllocNativeElement (object element)
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{
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if (element_type == null) {
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if (element is IWrapper)
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return (element as IWrapper).Handle;
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else
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return (IntPtr) GCHandle.Alloc (element);
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} else {
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if (element_type == typeof (string))
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return Marshaller.StringToPtrGStrdup (element as string);
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else if (element_type == typeof (FilenameString))
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return Marshaller.StringToFilenamePtr (element as string);
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else if (element_type == typeof (IntPtr))
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return (IntPtr) GCHandle.Alloc (element);
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else if (typeof (IWrapper).IsAssignableFrom (element_type))
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return (element as IWrapper).Handle;
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else if (element_type == typeof (int))
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return new IntPtr ((int) element);
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else if (element_type.IsValueType)
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return Marshaller.StructureToPtrAlloc (element);
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}
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return IntPtr.Zero;
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}
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internal object DataMarshal (IntPtr data)
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{
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object ret = null;
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if (element_type != null) {
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if (element_type == typeof (string))
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ret = Marshaller.Utf8PtrToString (data);
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else if (element_type == typeof (FilenameString))
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ret = Marshaller.FilenamePtrToString (data);
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else if (element_type == typeof (IntPtr))
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ret = data;
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else if (element_type.IsSubclassOf (typeof (Gst.GLib.Object)))
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ret = Gst.GLib.Object.GetObject (data, false);
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else if (element_type.IsSubclassOf (typeof (Gst.GLib.Opaque)))
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ret = Gst.GLib.Opaque.GetOpaque (data, element_type, elements_owned);
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else if (element_type == typeof (int))
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ret = (int) data;
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else if (element_type.IsValueType)
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ret = Marshal.PtrToStructure (data, element_type);
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else if (element_type.IsInterface) {
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Type adapter_type = element_type.Assembly.GetType (element_type.FullName + "Adapter");
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System.Reflection.MethodInfo method = adapter_type.GetMethod ("GetObject", new Type[] {typeof(IntPtr), typeof(bool)});
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ret = method.Invoke (null, new object[] {data, false});
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} else
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ret = Activator.CreateInstance (element_type, new object[] {data});
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} else if (Object.IsObject (data))
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ret = Gst.GLib.Object.GetObject (data, false);
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return ret;
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}
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[DllImport ("libglib-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
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static extern void g_free (IntPtr item);
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[DllImport ("libgobject-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
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static extern void g_object_unref (IntPtr item);
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public void Empty ()
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{
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if (elements_owned)
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for (uint i = 0; i < Count; i++)
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if (typeof (Gst.GLib.Object).IsAssignableFrom (element_type))
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g_object_unref (NthData (i));
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else if (typeof (Gst.GLib.Opaque).IsAssignableFrom (element_type))
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Gst.GLib.Opaque.GetOpaque (NthData (i), element_type, true).Dispose ();
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else
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g_free (NthData (i));
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if (managed)
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FreeList ();
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}
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IntPtr GetData (IntPtr current)
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{
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// data field is at offset 0 for GList and GSList
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return Marshal.ReadIntPtr (current);
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}
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IntPtr Next (IntPtr current)
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{
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// next field follows gpointer data field for GList and GSList
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return Marshal.ReadIntPtr (current, IntPtr.Size);
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}
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private class ListEnumerator : IEnumerator
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{
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private IntPtr current = IntPtr.Zero;
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private ListBase list;
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public ListEnumerator (ListBase list)
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{
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this.list = list;
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}
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public object Current {
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get {
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IntPtr data = list.GetData (current);
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object ret = null;
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ret = list.DataMarshal (data);
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return ret;
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}
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}
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public bool MoveNext ()
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{
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if (current == IntPtr.Zero)
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current = list.list_ptr;
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else
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current = list.Next (current);
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return (current != IntPtr.Zero);
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}
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public void Reset ()
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{
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current = IntPtr.Zero;
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}
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}
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// IEnumerable
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public IEnumerator GetEnumerator ()
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{
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return new ListEnumerator (this);
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}
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// IDisposable
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public void Dispose ()
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{
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Dispose (true);
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GC.SuppressFinalize (this);
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}
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protected virtual void Dispose (bool disposing)
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{
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Empty ();
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}
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void FreeList ()
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{
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if (list_ptr != IntPtr.Zero)
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Free (list_ptr);
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list_ptr = IntPtr.Zero;
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length = -1;
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}
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// ICloneable
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abstract public object Clone ();
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}
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}
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