wehub-resource-sync
101 lines
4.7 KiB
C#
101 lines
4.7 KiB
C#
/*
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* QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
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* Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System.Dynamic;
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using System.Linq.Expressions;
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using System.Reflection;
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namespace QuantConnect.Data
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{
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/// <summary>
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/// Provides an implementation of <see cref="DynamicMetaObject"/> that uses get/set methods to update
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/// values in the dynamic object.
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/// </summary>
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public class GetSetPropertyDynamicMetaObject : DynamicMetaObject
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{
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private readonly MethodInfo _setPropertyMethodInfo;
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private readonly MethodInfo _getPropertyMethodInfo;
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/// <summary>
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/// Initializes a new instance of the <see cref="T:QuantConnect.Data.GetSetPropertyDynamicMetaObject" /> class.
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/// </summary>
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/// <param name="expression">The expression representing this <see cref="T:System.Dynamic.DynamicMetaObject" /></param>
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/// <param name="value">The value represented by the <see cref="T:System.Dynamic.DynamicMetaObject" /></param>
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/// <param name="setPropertyMethodInfo">The set method to use for updating this dynamic object</param>
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/// <param name="getPropertyMethodInfo">The get method to use for updating this dynamic object</param>
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public GetSetPropertyDynamicMetaObject(
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Expression expression,
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object value,
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MethodInfo setPropertyMethodInfo,
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MethodInfo getPropertyMethodInfo
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)
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: base(expression, BindingRestrictions.Empty, value)
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{
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_setPropertyMethodInfo = setPropertyMethodInfo;
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_getPropertyMethodInfo = getPropertyMethodInfo;
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}
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/// <summary>
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/// Performs the binding of the dynamic set member operation.
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/// </summary>
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/// <param name="binder">An instance of the <see cref="T:System.Dynamic.SetMemberBinder" /> that represents the details of the dynamic operation.</param>
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/// <param name="value">The <see cref="T:System.Dynamic.DynamicMetaObject" /> representing the value for the set member operation.</param>
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/// <returns>The new <see cref="T:System.Dynamic.DynamicMetaObject" /> representing the result of the binding.</returns>
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public override DynamicMetaObject BindSetMember(SetMemberBinder binder, DynamicMetaObject value)
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{
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// we need to build up an expression tree that represents accessing our instance
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var restrictions = BindingRestrictions.GetTypeRestriction(Expression, LimitType);
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var args = new Expression[]
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{
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// this is the name of the property to set
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Expression.Constant(binder.Name),
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// this is the value
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Expression.Convert(value.Expression, typeof (object))
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};
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// set the 'this' reference
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var self = Expression.Convert(Expression, LimitType);
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var call = Expression.Call(self, _setPropertyMethodInfo, args);
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return new DynamicMetaObject(call, restrictions);
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}
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/// <summary>Performs the binding of the dynamic get member operation.</summary>
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/// <param name="binder">An instance of the <see cref="T:System.Dynamic.GetMemberBinder" /> that represents the details of the dynamic operation.</param>
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/// <returns>The new <see cref="T:System.Dynamic.DynamicMetaObject" /> representing the result of the binding.</returns>
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public override DynamicMetaObject BindGetMember(GetMemberBinder binder)
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{
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// we need to build up an expression tree that represents accessing our instance
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var restrictions = BindingRestrictions.GetTypeRestriction(Expression, LimitType);
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// arguments for 'call'
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var args = new Expression[]
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{
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// this is the name of the property to set
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Expression.Constant(binder.Name)
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};
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// set the 'this' reference
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var self = Expression.Convert(Expression, LimitType);
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var call = Expression.Call(self, _getPropertyMethodInfo, args);
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return new DynamicMetaObject(call, restrictions);
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}
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}
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} |