From cd0c436ecec7407ef56c765ed286a410990726c6 Mon Sep 17 00:00:00 2001
From: Stephan Sundermann <stephansundermann@gmail.com>
Date: Fri, 11 Oct 2013 14:53:39 +0200
Subject: [PATCH] Iterator: Added integration with IEnumerable

---
 sources/custom/Iterator.cs       | 103 +++++++++++++++++++++++++++++++
 sources/gstreamer-sharp.metadata |   2 +
 2 files changed, 105 insertions(+)
 create mode 100644 sources/custom/Iterator.cs

diff --git a/sources/custom/Iterator.cs b/sources/custom/Iterator.cs
new file mode 100644
index 0000000000..5ac128213d
--- /dev/null
+++ b/sources/custom/Iterator.cs
@@ -0,0 +1,103 @@
+// Iterator.cs - Custom iterator wrapper for IEnumerable
+//
+// Author:  Sebastian Dröge
+//			Stephan Sundermann <stephansundermann@gmail.com>
+//
+// Copyright (c) 2004-2009 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 Gst {
+
+	using System;
+	using System.Collections;
+	using System.Collections.Generic;
+	using System.Runtime.InteropServices;
+	using GLib;
+
+	public partial class Iterator : IEnumerable {
+
+		private class Enumerator : IEnumerator {
+			Iterator iterator;
+			Hashtable seen = new Hashtable ();
+
+			private object current = null;
+			public object Current {
+				get {
+					return current;
+				}
+			}
+
+			public bool MoveNext () {
+				IntPtr raw_ret;
+				bool retry = false;
+
+				if (iterator.Handle == IntPtr.Zero)
+					return false;
+
+				do {
+					GLib.Value value;
+					IteratorResult ret = iterator.Next (out value);
+
+					switch (ret) {
+					case IteratorResult.Done:
+						return false;
+					case IteratorResult.Ok:
+						if (seen.Contains (value)) {
+							retry = true;
+							break;
+						}
+						seen.Add (value , null);
+						current = value.Val;
+						return true;
+					case IteratorResult.Resync:
+						iterator.Resync ();
+						retry = true;
+						break;
+						default:
+					case IteratorResult.Error:
+						throw new Exception ("Error while iterating pads");
+					}
+				} while (retry);
+
+				return false;
+			}
+
+			public void Reset () {
+				seen.Clear ();
+				if (iterator.Handle != IntPtr.Zero)
+					iterator.Resync ();
+			}
+
+			public Enumerator (Iterator iterator) {
+				this.iterator = iterator;
+			}
+		}
+
+		private Enumerator enumerator = null;
+
+		public IEnumerator GetEnumerator () {
+			if (this.enumerator == null)
+				this.enumerator = new Enumerator (this);
+			return this.enumerator;
+		}
+
+		~Iterator () {
+			if (Raw != IntPtr.Zero)
+				Free ();
+		}
+
+	}
+}
diff --git a/sources/gstreamer-sharp.metadata b/sources/gstreamer-sharp.metadata
index 1eef09abe9..60f57818f4 100644
--- a/sources/gstreamer-sharp.metadata
+++ b/sources/gstreamer-sharp.metadata
@@ -47,6 +47,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 	<attr path="/api/namespace//struct[field/@cname='mini_object']" name="native">true</attr>
 	<change-node-type path="/api/namespace//boxed[@cname='GstStructure']">struct</change-node-type>
 	<attr path="/api/namespace/struct[@cname='GstStructure']" name="native">true</attr>
+	<change-node-type path="/api/namespace//boxed[@cname='GstIterator']">struct</change-node-type>
+	<attr path="/api/namespace/struct[@cname='GstIterator']" name="native">true</attr>
 	<remove-node path="/api/namespace/boxed[@cname='GstStructure']/field[@cname='name']" />
 	<!-- Maybe some problems with the name -->
 	<remove-node path="/api/namespace/interface[@cname='GstURIHandler']/class_struct/method[@vm='get_type']" name="vm" />