chore: import upstream snapshot with attribution

2026-07-13 13:02:50 +08:00
commit 0fc60fdcb1
5008 changed files with 910633 additions and 0 deletions
@@ -0,0 +1,62 @@
+/*
+ * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
+ * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
+ * 
+ * Licensed 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.Collections.Generic;
+using System.IO;
+
+namespace QuantConnect.ToolBox
+{
+    /// <summary>
+    /// Provides an implementation of <see cref="IStreamProvider"/> that just returns a file stream
+    /// </summary>
+    public class FileStreamProvider : IStreamProvider
+    {
+        private readonly Dictionary<string, FileStream> _files = new Dictionary<string, FileStream>();
+
+        /// <summary>
+        /// Opens the specified source as read to be consumed stream
+        /// </summary>
+        /// <param name="source">The source file to be opened</param>
+        /// <returns>The stream representing the specified source</returns>
+        public IEnumerable<Stream> Open(string source)
+        {
+            yield return File.OpenRead(source);
+        }
+
+        /// <summary>
+        /// Closes the specified source file stream
+        /// </summary>
+        /// <param name="source">The source file to be closed</param>
+        public void Close(string source)
+        {
+            // it's expected that users will dispose the stream
+            // from the open call, this is used to clean up any
+            // other resources, for example a ZipFile stream
+            // when we returned a ZipEntry stream
+            _files.Remove(source);
+        }
+
+        /// <summary>
+        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
+        /// </summary>
+        public void Dispose()
+        {
+            foreach (var kvp in _files)
+            {
+                kvp.Value.Dispose();
+            }
+        }
+    }
+}