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.
+*/
+
+using System;
+using QuantConnect.Data;
+
+namespace QuantConnect.Indicators
+{
+    /// <summary>
+    /// An indicator that will always return the same value.
+    /// </summary>
+    /// <typeparam name="T">The type of input this indicator takes</typeparam>
+    public sealed class ConstantIndicator<T> : IndicatorBase<T>
+        where T : IBaseData
+    {
+        private readonly decimal _value;
+
+        /// <summary>
+        /// Gets true since the ConstantIndicator is always ready to return the same value
+        /// </summary>
+        public override bool IsReady => true;
+
+        /// <summary>
+        /// Creates a new ConstantIndicator that will always return the specified value
+        /// </summary>
+        /// <param name="name">The name of this indicator</param>
+        /// <param name="value">The constant value to be returned</param>
+        public ConstantIndicator(string name, decimal value)
+            : base(name)
+        {
+            _value = value;
+
+            // set this immediately so it always has the .Value property correctly set,
+            // the time will be updated anytime this indicators Update method gets called.
+            Current = new IndicatorDataPoint(DateTime.MinValue, value);
+        }
+
+        /// <summary>
+        /// Computes the next value of this indicator from the given state
+        /// </summary>
+        /// <param name="input">The input given to the indicator</param>
+        /// <returns>A new value for this indicator</returns>
+        protected override decimal ComputeNextValue(T input)
+        {
+            return _value;
+        }
+
+        /// <summary>
+        /// Resets this indicator to its initial state
+        /// </summary>
+        public override void Reset()
+        {
+            base.Reset();
+
+            // re-initialize the current value, constant should ALWAYS return this value
+            Current = new IndicatorDataPoint(DateTime.MinValue, _value);
+        }
+    }
+}