/// <summary>
/// Generate an expression tree to deserialize a class
/// </summary>
/// <param name="inputStream">Stream to read from</param>
/// <param name="objTracker">Reference tracker</param>
/// <param name="leftSide">Left side of the assignment</param>
/// <param name="typeExpr">Type of the class as an expression</param>
/// <param name="typeName">Type of the class as a string</param>
/// <param name="typeHashCode">Hashcode of the class</param>
/// <param name="deserializer">Temporary deserializer variable</param>
/// <param name="itemType">Type of the class</param>
/// <returns>An expression tree to deserialize a class</returns>
internal static Expression GetReadClassExpression(ParameterExpression inputStream,
ParameterExpression objTracker,
Expression leftSide,
ParameterExpression typeExpr,
ParameterExpression typeName,
ParameterExpression typeHashCode,
ParameterExpression deserializer,
Type itemType)
{
var readType = Expression.IfThenElse(Expression.Equal(Expression.Convert(PrimitiveHelpers.ReadByte(inputStream, objTracker), typeof(byte)), Expression.Constant(SerializerObjectTracker.Value0)),
Expression.Assign(typeExpr, Expression.Call(SerializedTypeResolverMih.GetTypeFromFullName_Type(), Expression.Constant(itemType))),
Expression.Block(Expression.Assign(typeName, Deserializer.GenerateStringExpression(inputStream, objTracker)),
Expression.Assign(typeHashCode, PrimitiveHelpers.ReadInt32(inputStream, objTracker)),
Expression.Assign(typeExpr, Expression.Call(SerializedTypeResolverMih.GetTypeFromFullName_String(), typeName)),
Expression.IfThen(Expression.NotEqual(typeHashCode, Expression.Property(typeExpr, "HashCode")),
Expression.Throw(Expression.New(TypeWasModifiedSinceSerializationException.GetConstructor(), typeExpr)))));
var invokeDeserializer = Expression.Invoke(deserializer, inputStream, objTracker);
Expression convertExpression = Expression.Convert(Expression.Call(SerializerMih.ConvertObjectToExpectedType(), invokeDeserializer, Expression.Constant(itemType)), itemType);
return(Expression.IfThenElse(Expression.Equal(Expression.Convert(PrimitiveHelpers.ReadByte(inputStream, objTracker), typeof(byte)), Expression.Constant(SerializerObjectTracker.Value0)),
Expression.Assign(leftSide, Expression.Constant(null, itemType)),
Expression.Block(
readType,
Expression.Assign(deserializer, Expression.Call(DeserializerMih.GetTypeToObjectDeserializer(), Expression.Property(typeExpr, "Type"))),
Expression.Assign(leftSide, convertExpression))));
}
/// <summary>
/// Generate an expression that call the clone implementation method
/// </summary>
/// <param name="source">Source object</param>
/// <param name="refTrackerParam">Reference tracker</param>
/// <param name="expectedType">Expected type....mostly used for IQueryable detection</param>
/// <returns>An expression that call the clone implementation method</returns>
internal static Expression CallCopyExpression(Expression source, ParameterExpression refTrackerParam, Expression expectedType)
{
var itemAsObject = Expression.Parameter(typeof(object), "itemAsObject");
var variables = new List <ParameterExpression>();
variables.Add(itemAsObject);
var expressions = new List <Expression>();
expressions.Add(Expression.Assign(itemAsObject, Expression.Call(SerializerMih.PrepareObjectForSerialization(), source)));
expressions.Add(Expression.Assign(itemAsObject, Expression.Call(Expression.Call(ObjectClonerMih.CloneImpl(),
Expression.Call(itemAsObject, ObjectMih.GetTypeMethod())),
FuncMih.CloneMethodInvoke(),
Expression.Convert(itemAsObject, typeof(object)),
refTrackerParam)));
expressions.Add(Expression.Call(SerializerMih.ConvertObjectToExpectedType(),
itemAsObject,
expectedType));
return(Expression.Block(variables, expressions));
}
/// <summary>
/// Generates an expression tree to handle class type serialization
/// </summary>
/// <param name="outputStream">Stream to write to</param>
/// <param name="objTracking">Reference tracker</param>
/// <param name="item">Source object</param>
/// <param name="itemAsObj">Source object as an object</param>
/// <param name="typeExpr">Type of the object as an expression</param>
/// <param name="serializer">Serializer temporary variable</param>
/// <param name="itemType">Type of the element</param>
/// <returns>An expression tree to handle class type serialization</returns>
internal static Expression GetWriteClassTypeExpression(ParameterExpression outputStream,
ParameterExpression objTracking,
Expression item,
Expression itemAsObj,
ParameterExpression typeExpr,
ParameterExpression serializer,
Type itemType)
{
var writeType = Expression.IfThenElse(Expression.Equal(Expression.Call(item, ObjectMih.GetTypeMethod()), Expression.Constant(itemType)),
Expression.Block(PrimitiveHelpers.WriteByte(outputStream, Expression.Constant(SerializerObjectTracker.Value0), objTracking),
Expression.Assign(typeExpr, Expression.Constant(itemType)),
Expression.Assign(itemAsObj, Expression.Convert(item, typeof(object)))),
Expression.Block(PrimitiveHelpers.WriteByte(outputStream, Expression.Constant(SerializerObjectTracker.Value1), objTracking),
Expression.Assign(itemAsObj, Expression.Call(SerializerMih.PrepareObjectForSerialization(), item)),
Expression.Assign(typeExpr, Expression.Call(itemAsObj, ObjectMih.GetTypeMethod())),
GenerateStringExpression(outputStream, Expression.Call(SerializedTypeResolverMih.GetShortNameFromType(), typeExpr), objTracking),
PrimitiveHelpers.WriteInt32(outputStream, Expression.Call(SerializedTypeResolverMih.GetHashCodeFromType(), typeExpr), objTracking)));
return(Expression.IfThenElse(Expression.Equal(item, Expression.Constant(null)),
PrimitiveHelpers.WriteByte(outputStream, Expression.Constant(SerializerObjectTracker.Value0), objTracking),
Expression.Block(PrimitiveHelpers.WriteByte(outputStream, Expression.Constant(SerializerObjectTracker.Value1), objTracking),
writeType,
Expression.Assign(serializer, Expression.Call(SerializerMih.GetTypeToObjectSerializer(), typeExpr)),
Expression.Invoke(serializer, outputStream, itemAsObj, objTracking))));
}
internal static void GenerateCopyFieldsExpressions(IEnumerable <FieldInfo> fields,
ParameterExpression source,
ParameterExpression clone,
List <Expression> expressions,
ParameterExpression refTrackerParam,
ParameterExpression clonedItem)
{
foreach (var field in fields)
{
var cloneField = Expression.Field(clone, field);
var sourceField = Expression.Field(source, field);
if (field.FieldType.IsPrimitive || field.FieldType.IsValueType || (field.FieldType == typeof(string)))
{
if (field.IsInitOnly)
{
expressions.Add(Expression.Call(CopyReadOnlyFieldMethodInfo.GetMethodInfo(),
Expression.Constant(field),
Expression.Convert(sourceField, typeof(object)),
clone));
}
else
{
var from = sourceField;
var to = cloneField;
expressions.Add(Expression.Assign(to, from));
}
}
else
{
var es = new List <Expression>();
es.Add(Expression.Assign(clonedItem, Expression.Call(SerializerMih.PrepareObjectForSerialization(), sourceField)));
es.Add(Expression.Assign(clonedItem, CallCopyExpression(clonedItem, refTrackerParam, Expression.Constant(field.FieldType))));
if (IQueryableCloner.IsGenericIQueryableType(field.FieldType))
{
Type queryableInterface = IQueryableCloner.GetInterfaceType(field.FieldType, typeof(IQueryable <>));
var genericArgumentType = queryableInterface.GetGenericArguments()[0];
var copy2 = Expression.Convert(clonedItem, field.FieldType);
var m = Expression.Call(typeof(Queryable), "AsQueryable", new Type[] { genericArgumentType }, Expression.Convert(copy2, typeof(IEnumerable <>).MakeGenericType(genericArgumentType)));
es.Add(Expression.Assign(clonedItem, m));
}
if (field.FieldType == typeof(IQueryable))
{
es.Add(Expression.Assign(clonedItem, Expression.Call(IQueryableMih.ConvertToNonGenericQueryable(), clonedItem)));
}
if (field.IsInitOnly)
{
Func <Expression, Expression> assignExpr = exx => Expression.Call(CopyReadOnlyFieldMethodInfo.GetMethodInfo(),
Expression.Constant(field),
Expression.Convert(exx, typeof(object)),
clone);
var assignNullExpr = Expression.Call(CopyReadOnlyFieldMethodInfo.GetMethodInfo(),
Expression.Constant(field),
Expression.Constant(null, typeof(object)),
clone);
es.Add(clonedItem);
var conditionalExpression = Expression.IfThenElse(Expression.NotEqual(sourceField, Expression.Constant(null)),
assignExpr(Expression.Block(es)),
assignNullExpr);
expressions.Add(ObjectCloner.GenerateNullTrackedOrUntrackedExpression(sourceField,
cloneField,
field.FieldType,
refTrackerParam,
conditionalExpression,
trackedExpression: assignExpr)); // todo refactor this horrible method
}
else
{
es.Add(Expression.Assign(cloneField, Expression.Convert(clonedItem, field.FieldType)));
var conditionalExpression = Expression.IfThenElse(Expression.Equal(sourceField, Expression.Constant(null)),
Expression.Assign(cloneField, Expression.Constant(null, field.FieldType)),
Expression.Block(es));
expressions.Add(ObjectCloner.GenerateNullTrackedOrUntrackedExpression(sourceField,
cloneField,
field.FieldType,
refTrackerParam,
conditionalExpression));
}
}
}
}
