#region License // Copyright (c) 2007 James Newton-King // // Permission is hereby granted, free of charge, to any person // obtaining a copy of this software and associated documentation // files (the "Software"), to deal in the Software without // restriction, including without limitation the rights to use, // copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following // conditions: // // The above copyright notice and this permission notice shall be // included in all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES // OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, // WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR // OTHER DEALINGS IN THE SOFTWARE. #endregion #if !(NET20 || NET35) using System; using System.Collections.Generic; #if NET20 using Newtonsoft.Json.Utilities.LinqBridge; #endif using System.Text; using System.Reflection; using Newtonsoft.Json.Utilities; using System.Globalization; namespace Newtonsoft.Json.Serialization { /// <summary> /// Get and set values for a <see cref="MemberInfo"/> using dynamic methods. /// </summary> internal class ExpressionValueProvider : IValueProvider { private readonly MemberInfo _memberInfo; private Func<object, object> _getter; private Action<object, object> _setter; /// <summary> /// Initializes a new instance of the <see cref="ExpressionValueProvider"/> class. /// </summary> /// <param name="memberInfo">The member info.</param> public ExpressionValueProvider(MemberInfo memberInfo) { ValidationUtils.ArgumentNotNull(memberInfo, nameof(memberInfo)); _memberInfo = memberInfo; } /// <summary> /// Sets the value. /// </summary> /// <param name="target">The target to set the value on.</param> /// <param name="value">The value to set on the target.</param> public void SetValue(object target, object value) { try { if (_setter == null) { _setter = ExpressionReflectionDelegateFactory.Instance.CreateSet<object>(_memberInfo); } #if DEBUG // dynamic method doesn't check whether the type is 'legal' to set // add this check for unit tests if (value == null) { if (!ReflectionUtils.IsNullable(ReflectionUtils.GetMemberUnderlyingType(_memberInfo))) { throw new JsonSerializationException("Incompatible value. Cannot set {0} to null.".FormatWith(CultureInfo.InvariantCulture, _memberInfo)); } } else if (!ReflectionUtils.GetMemberUnderlyingType(_memberInfo).IsAssignableFrom(value.GetType())) { throw new JsonSerializationException("Incompatible value. Cannot set {0} to type {1}.".FormatWith(CultureInfo.InvariantCulture, _memberInfo, value.GetType())); } #endif _setter(target, value); } catch (Exception ex) { throw new JsonSerializationException("Error setting value to '{0}' on '{1}'.".FormatWith(CultureInfo.InvariantCulture, _memberInfo.Name, target.GetType()), ex); } } /// <summary> /// Gets the value. /// </summary> /// <param name="target">The target to get the value from.</param> /// <returns>The value.</returns> public object GetValue(object target) { try { if (_getter == null) { _getter = ExpressionReflectionDelegateFactory.Instance.CreateGet<object>(_memberInfo); } return _getter(target); } catch (Exception ex) { throw new JsonSerializationException("Error getting value from '{0}' on '{1}'.".FormatWith(CultureInfo.InvariantCulture, _memberInfo.Name, target.GetType()), ex); } } } } #endif