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using System;
using System.Collections;
using System.Runtime.InteropServices;
using GLib;
namespace Gst {
internal class Enumerable : IEnumerable {
private class Enumerator : IEnumerator {
Hashtable seen = new Hashtable ();
IntPtr iterator;
private object current = null;
public object Current {
get {
return current;
}
}
public bool MoveNext () {
IntPtr raw_ret;
bool retry = false;
if (iterator == IntPtr.Zero)
return false;
do {
int ret = gst_iterator_next (iterator, out raw_ret);
switch (ret) {
case 0:
return false;
case 1:
if (seen.Contains (raw_ret)) {
retry = true;
break;
}
seen.Add (raw_ret, null);
current = GLib.Object.GetObject (raw_ret, true);
return true;
case 2:
gst_iterator_resync (iterator);
retry = true;
break;
default:
case 3:
throw new Exception ("Error while iterating pads");
}
} while (retry);
return false;
}
public void Reset () {
seen.Clear ();
if (iterator != IntPtr.Zero)
gst_iterator_resync (iterator);
}
public Enumerator (IntPtr iterator) {
this.iterator = iterator;
}
}
private IntPtr iterator;
private Enumerator enumerator;
public Enumerable (IntPtr iterator) {
this.iterator = iterator;
this.enumerator = new Enumerator (iterator);
}
public IEnumerator GetEnumerator () {
return enumerator;
}
~Enumerable () {
if (iterator != IntPtr.Zero)
gst_iterator_free (iterator);
}
[DllImport ("gstreamer-0.10.dll") ]
static extern int gst_iterator_next (IntPtr iterator, out IntPtr elem);
[DllImport ("gstreamer-0.10.dll") ]
static extern void gst_iterator_resync (IntPtr iterator);
[DllImport ("gstreamer-0.10.dll") ]
static extern void gst_iterator_free (IntPtr iterator);
}
}
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