public void ConstructionWithTail()
{
ObjectConstructor ctor = new ObjectConstructor(typeof(Point));
ImportContext context = JsonConvert.CreateImportContext();
const string json = "{ y: 456, z: 789, x: 123 }";
ObjectConstructionResult result = ctor.CreateObject(context, JsonText.CreateReader(json));
Point point = (Point)result.Object;
Assert.AreEqual(123, point.X);
Assert.AreEqual(456, point.Y);
NamedJsonBuffer[] tail = JsonBuffer.From(result.TailReader).GetMembersArray();
Assert.AreEqual(1, tail.Length);
NamedJsonBuffer z = tail[0];
Assert.AreEqual("z", z.Name);
Assert.AreEqual(789, z.Buffer.GetNumber().ToInt32());
}
private static int FindMember(NamedJsonBuffer[] members, string name)
{
for (int i = 0; i < members.Length; i++)
{
NamedJsonBuffer member = members[i];
if (member.IsEmpty)
{
throw new ArgumentException(null, "members");
}
if (0 == CultureInfo.InvariantCulture.CompareInfo.Compare(name, member.Name, CompareOptions.IgnoreCase))
{
return(i);
}
}
return(-1);
}
public ObjectConstructionResult CreateObject(ImportContext context, NamedJsonBuffer[] members)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
if (members == null)
{
throw new ArgumentNullException("members");
}
if (_ctors.Length > 0)
{
foreach (ConstructorInfo ctor in _ctors)
{
ObjectConstructionResult result = TryCreateObject(context, ctor, members);
if (result != null)
{
return(result);
}
}
}
if (_type.IsValueType)
{
//
// Value types always have a default constructor available
// but one which does not show up in reflection. If no other
// constructors matched then just use the default one.
//
object obj = Activator.CreateInstance(_type);
JsonReader tail = NamedJsonBuffer.ToObject(members).CreateReader();
return(new ObjectConstructionResult(obj, tail));
}
throw new JsonException(string.Format("None constructor could be used to create {0} object from JSON.", _ctors[0].DeclaringType));
}
private static ObjectConstructionResult TryCreateObject(ImportContext context, ConstructorInfo ctor, NamedJsonBuffer[] members)
{
Debug.Assert(context != null);
Debug.Assert(ctor != null);
Debug.Assert(members != null);
ParameterInfo[] parameters = ctor.GetParameters();
if (parameters.Length > members.Length)
{
return(null);
}
int[] bindings = Bind(context, parameters, members);
int argc = 0;
object[] args = null;
JsonBufferWriter tailw = null;
for (int i = 0; i < bindings.Length; i++)
{
int binding = bindings[i] - 1;
if (binding >= 0)
{
if (args == null)
{
args = new object[parameters.Length];
}
Type type = parameters[binding].ParameterType;
JsonBuffer arg = members[i].Buffer;
args[binding] = context.Import(type, arg.CreateReader());
argc++;
}
else
{
if (tailw == null)
{
tailw = new JsonBufferWriter();
tailw.WriteStartObject();
}
NamedJsonBuffer member = members[i];
tailw.WriteMember(member.Name);
tailw.WriteFromReader(member.Buffer.CreateReader());
}
}
if (tailw != null)
{
tailw.WriteEndObject();
}
if (argc != parameters.Length)
{
return(null);
}
object obj = ctor.Invoke(args);
JsonBuffer tail = tailw != null
? tailw.GetBuffer()
: StockJsonBuffers.EmptyObject;
return(new ObjectConstructionResult(obj, tail.CreateReader()));
}
public ObjectConstructionResult CreateObject(ImportContext context, NamedJsonBuffer[] members)
{
if (context == null) throw new ArgumentNullException("context");
if (members == null) throw new ArgumentNullException("members");
if (_ctors.Length > 0)
{
foreach (ConstructorInfo ctor in _ctors)
{
ObjectConstructionResult result = TryCreateObject(context, ctor, members);
if (result != null)
return result;
}
}
if (_type.IsValueType)
{
//
// Value types always have a default constructor available
// but one which does not show up in reflection. If no other
// constructors matched then just use the default one.
//
object obj = Activator.CreateInstance(_type);
JsonReader tail = NamedJsonBuffer.ToObject(members).CreateReader();
return new ObjectConstructionResult(obj, tail);
}
throw new JsonException(string.Format("None constructor could be used to create {0} object from JSON.", _ctors[0].DeclaringType));
}
private static int FindMember(NamedJsonBuffer[] members, string name)
{
for (int i = 0; i < members.Length; i++)
{
NamedJsonBuffer member = members[i];
if (member.IsEmpty)
throw new ArgumentException(null, "members");
if (0 == CultureInfo.InvariantCulture.CompareInfo.Compare(name, member.Name, CompareOptions.IgnoreCase))
return i;
}
return -1;
}
/// <remarks>
/// Bound indicies returned in the resulting array are one-based
/// therefore zero means unbound.
/// </remarks>
private static int[] Bind(ImportContext context, ParameterInfo[] parameters, NamedJsonBuffer[] members)
{
if (context == null) throw new ArgumentNullException("context");
if (parameters == null) throw new ArgumentNullException("parameters");
if (members == null) throw new ArgumentNullException("members");
int[] bindings = new int[members.Length];
for (int i = 0; i < parameters.Length; i++)
{
ParameterInfo parameter = parameters[i];
if (parameter == null)
throw new ArgumentException(null, "parameters");
int mi = FindMember(members, parameter.Name);
if (mi >= 0)
bindings[mi] = i + 1;
}
return bindings;
}
private static ObjectConstructionResult TryCreateObject(ImportContext context, ConstructorInfo ctor, NamedJsonBuffer[] members)
{
Debug.Assert(context != null);
Debug.Assert(ctor != null);
Debug.Assert(members != null);
ParameterInfo[] parameters = ctor.GetParameters();
if (parameters.Length > members.Length)
return null;
int[] bindings = Bind(context, parameters, members);
int argc = 0;
object[] args = null;
JsonBufferWriter tailw = null;
for (int i = 0; i < bindings.Length; i++)
{
int binding = bindings[i] - 1;
if (binding >= 0)
{
if (args == null)
args = new object[parameters.Length];
Type type = parameters[binding].ParameterType;
JsonBuffer arg = members[i].Buffer;
args[binding] = context.Import(type, arg.CreateReader());
argc++;
}
else
{
if (tailw == null)
{
tailw = new JsonBufferWriter();
tailw.WriteStartObject();
}
NamedJsonBuffer member = members[i];
tailw.WriteMember(member.Name);
tailw.WriteFromReader(member.Buffer.CreateReader());
}
}
if (tailw != null)
tailw.WriteEndObject();
if (argc != parameters.Length)
return null;
object obj = ctor.Invoke(args);
JsonBuffer tail = tailw != null
? tailw.GetBuffer()
: StockJsonBuffers.EmptyObject;
return new ObjectConstructionResult(obj, tail.CreateReader());
}
