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 +1,70 @@
+/*
+ * 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;
+using System.Collections.Generic;
+using System.IO;
+
+namespace QuantConnect.ToolBox
+{
+    /// <summary>
+    /// Defines how to open/close a source file
+    /// </summary>
+    public interface IStreamProvider : IDisposable
+    {
+        /// <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>
+        IEnumerable<Stream> Open(string source);
+
+        /// <summary>
+        /// Closes the specified source file stream
+        /// </summary>
+        /// <param name="source">The source file to be closed</param>
+        void Close(string source);
+    }
+
+    /// <summary>
+    /// Provides factor method for creating an <see cref="IStreamProvider"/> from a file name
+    /// </summary>
+    public static class StreamProvider
+    {
+        /// <summary>
+        /// Creates a new <see cref="IStreamProvider"/> capable of reading a file with the specified extenson
+        /// </summary>
+        /// <param name="extension">The file extension</param>
+        /// <returns>A new stream provider capable of reading files with the specified extension</returns>
+        public static IStreamProvider ForExtension(string extension)
+        {
+            var ext = Path.GetExtension(extension);
+            if (ext == ".zip")
+            {
+                return new ZipStreamProvider();
+            }
+            if (ext == ".bz2")
+            {
+                return new Bz2StreamProvider();
+            }
+            if (ext == ".gz")
+            {
+                return new GzipStreamProvider();
+            }
+
+            return new FileStreamProvider();
+        }
+    }
+}