private static IFormatter <T> GetBaseFormatter(ISerializationPolicy serializationPolicy)
{
// This is an optimization - it's a lot cheaper to compare three references and do a null check,
// than it is to look something up in a dictionary. By far most of the time, we will be using
// one of these three policies.
if (object.ReferenceEquals(serializationPolicy, UnityPolicy))
{
if (UnityPolicyFormatter == null)
{
UnityPolicyFormatter = FormatterLocator.GetFormatter <T>(UnityPolicy);
}
return(UnityPolicyFormatter);
}
else if (object.ReferenceEquals(serializationPolicy, EverythingPolicy))
{
if (EverythingPolicyFormatter == null)
{
EverythingPolicyFormatter = FormatterLocator.GetFormatter <T>(EverythingPolicy);
}
return(EverythingPolicyFormatter);
}
else if (object.ReferenceEquals(serializationPolicy, StrictPolicy))
{
if (StrictPolicyFormatter == null)
{
StrictPolicyFormatter = FormatterLocator.GetFormatter <T>(StrictPolicy);
}
return(StrictPolicyFormatter);
}
IFormatter <T> formatter;
lock (FormattersByPolicy_LOCK)
{
if (!FormattersByPolicy.TryGetValue(serializationPolicy, out formatter))
{
formatter = FormatterLocator.GetFormatter <T>(serializationPolicy);
FormattersByPolicy.Add(serializationPolicy, formatter);
}
}
return(formatter);
}
/// <summary>
/// Reads a value of type <see cref="T" />.
/// </summary>
/// <param name="reader">The reader to use.</param>
/// <returns>
/// The value which has been read.
/// </returns>
public override T ReadValue(IDataReader reader)
{
var context = reader.Context;
if (context.Config.SerializationPolicy.AllowNonSerializableTypes == false && TypeOf_T.IsSerializable == false)
{
context.Config.DebugContext.LogError("The type " + TypeOf_T.Name + " is not marked as serializable.");
return(default(T));
}
bool exitNode = true;
string name;
var entry = reader.PeekEntry(out name);
if (ComplexTypeIsValueType)
{
if (entry == EntryType.Null)
{
context.Config.DebugContext.LogWarning("Expecting complex struct of type " + TypeOf_T.GetNiceFullName() + " but got null value.");
reader.ReadNull();
return(default(T));
}
else if (entry != EntryType.StartOfNode)
{
context.Config.DebugContext.LogWarning("Unexpected entry '" + name + "' of type " + entry.ToString() + ", when " + EntryType.StartOfNode + " was expected. A value has likely been lost.");
reader.SkipEntry();
return(default(T));
}
try
{
Type expectedType = TypeOf_T;
Type serializedType;
if (reader.EnterNode(out serializedType))
{
if (serializedType != expectedType)
{
if (serializedType != null)
{
context.Config.DebugContext.LogWarning("Expected complex struct value " + expectedType.Name + " but the serialized value is of type " + serializedType.Name + ".");
if (serializedType.IsCastableTo(expectedType))
{
object value = FormatterLocator.GetFormatter(serializedType, context.Config.SerializationPolicy).Deserialize(reader);
bool serializedTypeIsNullable = serializedType.IsGenericType && serializedType.GetGenericTypeDefinition() == typeof(Nullable <>);
bool allowCastMethod = !ComplexTypeIsNullable && !serializedTypeIsNullable;
var castMethod = allowCastMethod ? serializedType.GetCastMethodDelegate(expectedType) : null;
if (castMethod != null)
{
return((T)castMethod(value));
}
else
{
return((T)value);
}
}
else if (AllowDeserializeInvalidDataForT || reader.Context.Config.AllowDeserializeInvalidData)
{
context.Config.DebugContext.LogWarning("Can't cast serialized type " + serializedType.Name + " into expected type " + expectedType.Name + ". Attempting to deserialize with possibly invalid data. Value may be lost or corrupted for node '" + name + "'.");
return(GetBaseFormatter(context.Config.SerializationPolicy).Deserialize(reader));
}
else
{
context.Config.DebugContext.LogWarning("Can't cast serialized type " + serializedType.Name + " into expected type " + expectedType.Name + ". Value lost for node '" + name + "'.");
return(default(T));
}
}
else if (AllowDeserializeInvalidDataForT || reader.Context.Config.AllowDeserializeInvalidData)
{
context.Config.DebugContext.LogWarning("Expected complex struct value " + expectedType.Name + " but the serialized type could not be resolved. Attempting to deserialize with possibly invalid data. Value may be lost or corrupted for node '" + name + "'.");
return(GetBaseFormatter(context.Config.SerializationPolicy).Deserialize(reader));
}
else
{
context.Config.DebugContext.LogWarning("Expected complex struct value " + expectedType.Name + " but the serialized type could not be resolved. Value lost for node '" + name + "'.");
return(default(T));
}
}
else
{
return(GetBaseFormatter(context.Config.SerializationPolicy).Deserialize(reader));
}
}
else
{
context.Config.DebugContext.LogError("Failed to enter node '" + name + "'.");
return(default(T));
}
}
catch (SerializationAbortException ex)
{
exitNode = false;
throw ex;
}
catch (Exception ex)
{
context.Config.DebugContext.LogException(ex);
return(default(T));
}
finally
{
if (exitNode)
{
reader.ExitNode();
}
}
}
else
{
switch (entry)
{
case EntryType.Null:
{
reader.ReadNull();
return(default(T));
}
case EntryType.ExternalReferenceByIndex:
{
int index;
reader.ReadExternalReference(out index);
object value = context.GetExternalObject(index);
try
{
return((T)value);
}
catch (InvalidCastException)
{
context.Config.DebugContext.LogWarning("Can't cast external reference type " + value.GetType().Name + " into expected type " + TypeOf_T.Name + ". Value lost for node '" + name + "'.");
return(default(T));
}
}
case EntryType.ExternalReferenceByGuid:
{
Guid guid;
reader.ReadExternalReference(out guid);
object value = context.GetExternalObject(guid);
try
{
return((T)value);
}
catch (InvalidCastException)
{
context.Config.DebugContext.LogWarning("Can't cast external reference type " + value.GetType().Name + " into expected type " + TypeOf_T.Name + ". Value lost for node '" + name + "'.");
return(default(T));
}
}
case EntryType.ExternalReferenceByString:
{
string id;
reader.ReadExternalReference(out id);
object value = context.GetExternalObject(id);
try
{
return((T)value);
}
catch (InvalidCastException)
{
context.Config.DebugContext.LogWarning("Can't cast external reference type " + value.GetType().Name + " into expected type " + TypeOf_T.Name + ". Value lost for node '" + name + "'.");
return(default(T));
}
}
case EntryType.InternalReference:
{
int id;
reader.ReadInternalReference(out id);
object value = context.GetInternalReference(id);
try
{
return((T)value);
}
catch (InvalidCastException)
{
context.Config.DebugContext.LogWarning("Can't cast internal reference type " + value.GetType().Name + " into expected type " + TypeOf_T.Name + ". Value lost for node '" + name + "'.");
return(default(T));
}
}
case EntryType.StartOfNode:
{
try
{
Type expectedType = TypeOf_T;
Type serializedType;
int id;
if (reader.EnterNode(out serializedType))
{
id = reader.CurrentNodeId;
T result;
if (serializedType != null && expectedType != serializedType) // We have type metadata different from the expected type
{
bool success = false;
var isPrimitive = FormatterUtilities.IsPrimitiveType(serializedType);
bool assignableCast;
if (ComplexTypeMayBeBoxedValueType && isPrimitive)
{
// It's a boxed primitive type, so simply read that straight and register success
var serializer = Serializer.Get(serializedType);
result = (T)serializer.ReadValueWeak(reader);
success = true;
}
else if ((assignableCast = expectedType.IsAssignableFrom(serializedType)) || serializedType.HasCastDefined(expectedType, false))
{
try
{
object value;
if (isPrimitive)
{
var serializer = Serializer.Get(serializedType);
value = serializer.ReadValueWeak(reader);
}
else
{
var alternateFormatter = FormatterLocator.GetFormatter(serializedType, context.Config.SerializationPolicy);
value = alternateFormatter.Deserialize(reader);
}
if (assignableCast)
{
result = (T)value;
}
else
{
var castMethod = serializedType.GetCastMethodDelegate(expectedType);
if (castMethod != null)
{
result = (T)castMethod(value);
}
else
{
// Let's just give it a go anyways
result = (T)value;
}
}
success = true;
}
catch (SerializationAbortException ex)
{
exitNode = false;
throw ex;
}
catch (InvalidCastException)
{
success = false;
result = default(T);
}
}
else if (!ComplexTypeIsAbstract && (AllowDeserializeInvalidDataForT || reader.Context.Config.AllowDeserializeInvalidData))
{
// We will try to deserialize an instance of T with the invalid data.
context.Config.DebugContext.LogWarning("Can't cast serialized type " + serializedType.Name + " into expected type " + expectedType.Name + ". Attempting to deserialize with invalid data. Value may be lost or corrupted for node '" + name + "'.");
result = GetBaseFormatter(context.Config.SerializationPolicy).Deserialize(reader);
success = true;
}
else
{
// We couldn't cast or use the type, but we still have to deserialize it and register
// the reference so the reference isn't lost if it is referred to further down
// the data stream.
var alternateFormatter = FormatterLocator.GetFormatter(serializedType, context.Config.SerializationPolicy);
object value = alternateFormatter.Deserialize(reader);
if (id >= 0)
{
context.RegisterInternalReference(id, value);
}
result = default(T);
}
if (!success)
{
// We can't use this
context.Config.DebugContext.LogWarning("Can't cast serialized type " + serializedType.Name + " into expected type " + expectedType.Name + ". Value lost for node '" + name + "'.");
result = default(T);
}
}
else if (ComplexTypeIsAbstract)
{
result = default(T);
}
else
{
result = GetBaseFormatter(context.Config.SerializationPolicy).Deserialize(reader);
}
if (id >= 0)
{
context.RegisterInternalReference(id, result);
}
return(result);
}
else
{
context.Config.DebugContext.LogError("Failed to enter node '" + name + "'.");
return(default(T));
}
}
catch (SerializationAbortException ex)
{
exitNode = false;
throw ex;
}
catch (Exception ex)
{
context.Config.DebugContext.LogException(ex);
return(default(T));
}
finally
{
if (exitNode)
{
reader.ExitNode();
}
}
}
//
// The below cases are for when we expect an object, but have
// serialized a straight primitive type. In such cases, we can
// often box the primitive type as an object.
//
// Sadly, the exact primitive type might be lost in case of
// integer and floating points numbers, as we don't know what
// type to expect.
//
// To be safe, we read and box the most precise type available.
//
case EntryType.Boolean:
{
if (!ComplexTypeMayBeBoxedValueType)
{
goto default;
}
bool value;
reader.ReadBoolean(out value);
return((T)(object)value);
}
case EntryType.FloatingPoint:
{
if (!ComplexTypeMayBeBoxedValueType)
{
goto default;
}
double value;
reader.ReadDouble(out value);
return((T)(object)value);
}
case EntryType.Integer:
{
if (!ComplexTypeMayBeBoxedValueType)
{
goto default;
}
long value;
reader.ReadInt64(out value);
return((T)(object)value);
}
case EntryType.String:
{
if (!ComplexTypeMayBeBoxedValueType)
{
goto default;
}
string value;
reader.ReadString(out value);
return((T)(object)value);
}
case EntryType.Guid:
{
if (!ComplexTypeMayBeBoxedValueType)
{
goto default;
}
Guid value;
reader.ReadGuid(out value);
return((T)(object)value);
}
default:
// Lost value somehow
context.Config.DebugContext.LogWarning("Unexpected entry of type " + entry.ToString() + ", when a reference or node start was expected. A value has been lost.");
reader.SkipEntry();
return(default(T));
}
}
}
/// <summary>
/// Writes a value of type <see cref="T" />.
/// </summary>
/// <param name="name">The name of the value to write.</param>
/// <param name="value">The value to write.</param>
/// <param name="writer">The writer to use.</param>
public override void WriteValue(string name, T value, IDataWriter writer)
{
var context = writer.Context;
var policy = context.Config.SerializationPolicy;
if (policy.AllowNonSerializableTypes == false && TypeOf_T.IsSerializable == false)
{
context.Config.DebugContext.LogError("The type " + TypeOf_T.Name + " is not marked as serializable.");
return;
}
FireOnSerializedType();
if (ComplexTypeIsValueType)
{
bool endNode = true;
try
{
writer.BeginStructNode(name, TypeOf_T);
GetBaseFormatter(policy).Serialize(value, writer);
}
catch (SerializationAbortException ex)
{
endNode = false;
throw ex;
}
finally
{
if (endNode)
{
writer.EndNode(name);
}
}
}
else
{
int id;
int index;
string strId;
Guid guid;
bool endNode = true;
if (object.ReferenceEquals(value, null))
{
writer.WriteNull(name);
}
else if (context.TryRegisterExternalReference(value, out index))
{
writer.WriteExternalReference(name, index);
}
else if (context.TryRegisterExternalReference(value, out guid))
{
writer.WriteExternalReference(name, guid);
}
else if (context.TryRegisterExternalReference(value, out strId))
{
writer.WriteExternalReference(name, strId);
}
else if (context.TryRegisterInternalReference(value, out id))
{
Type type = value.GetType(); // Get type of actual stored object
if (ComplexTypeMayBeBoxedValueType && FormatterUtilities.IsPrimitiveType(type))
// It's a boxed primitive type
{
try
{
writer.BeginReferenceNode(name, type, id);
var serializer = Serializer.Get(type);
serializer.WriteValueWeak(value, writer);
}
catch (SerializationAbortException ex)
{
endNode = false;
throw ex;
}
finally
{
if (endNode)
{
writer.EndNode(name);
}
}
}
else
{
IFormatter formatter;
if (object.ReferenceEquals(type, TypeOf_T))
{
formatter = GetBaseFormatter(policy);
}
else
{
formatter = FormatterLocator.GetFormatter(type, policy);
}
try
{
writer.BeginReferenceNode(name, type, id);
formatter.Serialize(value, writer);
}
catch (SerializationAbortException ex)
{
endNode = false;
throw ex;
}
finally
{
if (endNode)
{
writer.EndNode(name);
}
}
}
}
else
{
writer.WriteInternalReference(name, id);
}
}
}
/// <summary>
/// Skips the next entry value, unless it is an <see cref="EntryType.EndOfNode"/> or an <see cref="EntryType.EndOfArray"/>. If the next entry value is an <see cref="EntryType.StartOfNode"/> or an <see cref="EntryType.StartOfArray"/>, all of its contents will be processed, deserialized and registered in the deserialization context, so that internal reference values are not lost to entries further down the stream.
/// </summary>
public virtual void SkipEntry()
{
var peekedEntry = this.PeekEntry();
if (peekedEntry == EntryType.StartOfNode)
{
Type type;
bool exitNode = true;
this.EnterNode(out type);
try
{
if (type != null)
{
// We have the necessary metadata to read this type, and register all of its reference values (perhaps including itself) in the serialization context
// Sadly, we have no choice but to risk boxing of structs here
// Luckily, this is a rare case
if (FormatterUtilities.IsPrimitiveType(type))
{
// It is a boxed primitive type; we read the value and register it
var serializer = Serializer.Get(type);
object value = serializer.ReadValueWeak(this);
if (this.CurrentNodeId >= 0)
{
this.Context.RegisterInternalReference(this.CurrentNodeId, value);
}
}
else
{
var formatter = FormatterLocator.GetFormatter(type, this.Context.Config.SerializationPolicy);
object value = formatter.Deserialize(this);
if (this.CurrentNodeId >= 0)
{
this.Context.RegisterInternalReference(this.CurrentNodeId, value);
}
}
}
else
{
// We have no metadata, and reference values might be lost
// We must read until a node on the same level terminates
while (true)
{
peekedEntry = this.PeekEntry();
if (peekedEntry == EntryType.EndOfStream)
{
break;
}
else if (peekedEntry == EntryType.EndOfNode)
{
break;
}
else if (peekedEntry == EntryType.EndOfArray)
{
this.ReadToNextEntry(); // Consume end of arrays that we can potentially get stuck on
}
else
{
this.SkipEntry();
}
}
}
}
catch (SerializationAbortException ex)
{
exitNode = false;
throw ex;
}
finally
{
if (exitNode)
{
this.ExitNode();
}
}
}
else if (peekedEntry == EntryType.StartOfArray)
{
// We must read until an array on the same level terminates
this.ReadToNextEntry(); // Consume start of array
while (true)
{
peekedEntry = this.PeekEntry();
if (peekedEntry == EntryType.EndOfStream)
{
break;
}
else if (peekedEntry == EntryType.EndOfArray)
{
this.ReadToNextEntry(); // Consume end of array and break
break;
}
else if (peekedEntry == EntryType.EndOfNode)
{
this.ReadToNextEntry(); // Consume end of nodes that we can potentially get stuck on
}
else
{
this.SkipEntry();
}
}
}
else if (peekedEntry != EntryType.EndOfArray && peekedEntry != EntryType.EndOfNode) // We can't skip end of arrays and end of nodes
{
this.ReadToNextEntry(); // We can just skip a single value entry
}
}
