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