THRIFT-309. Make Thrift's C# mapping .NET 2.0 (Mono 1.2.4) compatible
git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@743963 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/csharp/src/Collections/THashSet.cs b/lib/csharp/src/Collections/THashSet.cs
new file mode 100644
index 0000000..51a09b5
--- /dev/null
+++ b/lib/csharp/src/Collections/THashSet.cs
@@ -0,0 +1,142 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+namespace Thrift.Collections
+{
+ public class THashSet<T> : ICollection<T>
+ {
+#if NET_2_0
+ TDictSet<T> set = new TDictSet<T>();
+#else
+ HashSet<T> set = new HashSet<T>();
+#endif
+ public int Count
+ {
+ get { return set.Count; }
+ }
+
+ public bool IsReadOnly
+ {
+ get { return set.IsReadOnly; }
+ }
+
+ public void Add(T item)
+ {
+ set.Add(item);
+ }
+
+ public void Clear()
+ {
+ set.Clear();
+ }
+
+ public bool Contains(T item)
+ {
+ return set.Contains(item);
+ }
+
+ public void CopyTo(T[] array, int arrayIndex)
+ {
+ set.CopyTo(array, arrayIndex);
+ }
+
+ public IEnumerator GetEnumerator()
+ {
+ return set.GetEnumerator();
+ }
+
+ IEnumerator<T> IEnumerable<T>.GetEnumerator()
+ {
+ return ((IEnumerable<T>)set).GetEnumerator();
+ }
+
+ public bool Remove(T item)
+ {
+ return set.Remove(item);
+ }
+
+#if NET_2_0
+ private class TDictSet<V> : ICollection<V>
+ {
+ Dictionary<V, TDictSet<V>> dict = new Dictionary<V, TDictSet<V>>();
+
+ public int Count
+ {
+ get { return dict.Count; }
+ }
+
+ public bool IsReadOnly
+ {
+ get { return false; }
+ }
+
+ public IEnumerator GetEnumerator()
+ {
+ return ((IEnumerable)dict.Keys).GetEnumerator();
+ }
+
+ IEnumerator<V> IEnumerable<V>.GetEnumerator()
+ {
+ return dict.Keys.GetEnumerator();
+ }
+
+ public bool Add(V item)
+ {
+ if (!dict.ContainsKey(item))
+ {
+ dict[item] = this;
+ return true;
+ }
+
+ return false;
+ }
+
+ void ICollection<V>.Add(V item)
+ {
+ Add(item);
+ }
+
+ public void Clear()
+ {
+ dict.Clear();
+ }
+
+ public bool Contains(V item)
+ {
+ return dict.ContainsKey(item);
+ }
+
+ public void CopyTo(V[] array, int arrayIndex)
+ {
+ dict.Keys.CopyTo(array, arrayIndex);
+ }
+
+ public bool Remove(V item)
+ {
+ return dict.Remove(item);
+ }
+ }
+#endif
+ }
+
+}