2 // Copyright (c) 2007 James Newton-King
4 // Permission is hereby granted, free of charge, to any person
5 // obtaining a copy of this software and associated documentation
6 // files (the "Software"), to deal in the Software without
7 // restriction, including without limitation the rights to use,
8 // copy, modify, merge, publish, distribute, sublicense, and/or sell
9 // copies of the Software, and to permit persons to whom the
10 // Software is furnished to do so, subject to the following
13 // The above copyright notice and this permission notice shall be
14 // included in all copies or substantial portions of the Software.
16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
18 // OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
20 // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 // WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 // OTHER DEALINGS IN THE SOFTWARE.
27 using System.Collections.Generic;
29 using System.Reflection;
30 using Newtonsoft.Json.Utilities;
31 using System.Collections;
33 namespace Newtonsoft.Json.Serialization
36 /// Contract details for a <see cref="Type"/> used by the <see cref="JsonSerializer"/>.
38 public class JsonArrayContract : JsonContract
40 internal Type CollectionItemType { get; private set; }
42 private readonly bool _isCollectionItemTypeNullableType;
43 private readonly Type _genericCollectionDefinitionType;
44 private Type _genericWrapperType;
45 private MethodCall<object, object> _genericWrapperCreator;
48 /// Initializes a new instance of the <see cref="JsonArrayContract"/> class.
50 /// <param name="underlyingType">The underlying type for the contract.</param>
51 public JsonArrayContract(Type underlyingType)
52 : base(underlyingType)
54 if (ReflectionUtils.ImplementsGenericDefinition(underlyingType, typeof(ICollection<>), out _genericCollectionDefinitionType))
56 CollectionItemType = _genericCollectionDefinitionType.GetGenericArguments()[0];
60 CollectionItemType = ReflectionUtils.GetCollectionItemType(UnderlyingType);
63 if (CollectionItemType != null)
64 _isCollectionItemTypeNullableType = ReflectionUtils.IsNullableType(CollectionItemType);
66 if (IsTypeGenericCollectionInterface(UnderlyingType))
68 CreatedType = ReflectionUtils.MakeGenericType(typeof(List<>), CollectionItemType);
72 internal IWrappedCollection CreateWrapper(object list)
74 if ((list is IList && (CollectionItemType == null || !_isCollectionItemTypeNullableType))
75 || UnderlyingType.IsArray)
76 return new CollectionWrapper<object>((IList)list);
78 if (_genericCollectionDefinitionType != null)
80 EnsureGenericWrapperCreator();
81 return (IWrappedCollection) _genericWrapperCreator(null, list);
85 IList values = ((IEnumerable) list).Cast<object>().ToList();
87 if (CollectionItemType != null)
89 Array array = Array.CreateInstance(CollectionItemType, values.Count);
90 for (int i = 0; i < values.Count; i++)
92 array.SetValue(values[i], i);
98 return new CollectionWrapper<object>(values);
102 private void EnsureGenericWrapperCreator()
104 if (_genericWrapperType == null)
106 _genericWrapperType = ReflectionUtils.MakeGenericType(typeof (CollectionWrapper<>), CollectionItemType);
108 Type constructorArgument = (ReflectionUtils.InheritsGenericDefinition(_genericCollectionDefinitionType, typeof (List<>)))
109 ? ReflectionUtils.MakeGenericType(typeof (ICollection<>), CollectionItemType)
110 : _genericCollectionDefinitionType;
112 ConstructorInfo genericWrapperConstructor = _genericWrapperType.GetConstructor(new[] { constructorArgument });
113 _genericWrapperCreator = JsonTypeReflector.ReflectionDelegateFactory.CreateMethodCall<object>(genericWrapperConstructor);
117 private bool IsTypeGenericCollectionInterface(Type type)
119 if (!type.IsGenericType)
122 Type genericDefinition = type.GetGenericTypeDefinition();
124 return (genericDefinition == typeof(IList<>)
125 || genericDefinition == typeof(ICollection<>)
126 || genericDefinition == typeof(IEnumerable<>));