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
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+/*
+ * 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.
+*/
+
+namespace QuantConnect.Securities
+{
+    /// <summary>
+    /// Represents a type capable of fetching the holdings for the specified symbol
+    /// </summary>
+    public interface ISecurityProvider
+    {
+        /// <summary>
+        /// Retrieves a summary of the holdings for the specified symbol
+        /// </summary>
+        /// <param name="symbol">The symbol to get holdings for</param>
+        /// <returns>The holdings for the symbol or null if the symbol is invalid and/or not in the portfolio</returns>
+        Security GetSecurity(Symbol symbol);
+    }
+
+    /// <summary>
+    /// Provides extension methods for the <see cref="ISecurityProvider"/> interface.
+    /// </summary>
+    public static class SecurityProviderExtensions
+    {
+        /// <summary>
+        /// Extension method to return the quantity of holdings, if no holdings are present, then zero is returned.
+        /// </summary>
+        /// <param name="provider">The <see cref="ISecurityProvider"/></param>
+        /// <param name="symbol">The symbol we want holdings quantity for</param>
+        /// <returns>The quantity of holdings for the specified symbol</returns>
+        public static decimal GetHoldingsQuantity(this ISecurityProvider provider, Symbol symbol)
+        {
+            var security = provider.GetSecurity(symbol);
+            return security == null ? 0 : security.Holdings.Quantity;
+        }
+    }
+}