Iterator: Added integration with IEnumerable

diff --git a/sources/custom/Iterator.cs b/sources/custom/Iterator.cs
new file mode 100644 (file)
index 0000000..5ac1282
--- /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 1eef09abe9fa4f231a8e555541d2c8841e844dcd..60f57818f451078cbcbf03454b971eddb1c137a8 100644 (file)
--- 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" />