public static Expression MapToArray(
IGlobalConfiguration configurationProvider,
ProfileMap profileMap,
Expression sourceExpression,
Type destinationType
)
{
var destinationElementType = destinationType.GetElementType();
if (destinationType.GetArrayRank() > 1)
{
return(Call(
MapMultidimensionalMethod,
sourceExpression,
Constant(destinationElementType),
ContextParameter
));
}
var sourceType = sourceExpression.Type;
Type sourceElementType = typeof(object);
Expression createDestination;
var destination = Parameter(destinationType, "destinationArray");
if (sourceType.IsArray)
{
var mapFromArray = MapFromArray();
if (mapFromArray != null)
{
return(mapFromArray);
}
}
else
{
var mapFromIEnumerable = MapFromIEnumerable();
if (mapFromIEnumerable != null)
{
return(mapFromIEnumerable);
}
var count = Call(
CountMethod.MakeGenericMethod(sourceElementType),
sourceExpression
);
createDestination = Assign(
destination,
NewArrayBounds(destinationElementType, count)
);
}
var itemParam = Parameter(sourceElementType, "sourceItem");
var itemExpr = configurationProvider.MapExpression(
profileMap,
new TypePair(sourceElementType, destinationElementType),
itemParam
);
var indexParam = Parameter(typeof(int), "destinationArrayIndex");
var setItem = Assign(
ArrayAccess(destination, PostIncrementAssign(indexParam)),
itemExpr
);
return(Block(
new[] { destination, indexParam },
createDestination,
Assign(indexParam, Zero),
ForEach(itemParam, sourceExpression, setItem),
destination
));
Expression MapFromArray()
{
sourceElementType = sourceType.GetElementType();
createDestination = Assign(
destination,
NewArrayBounds(destinationElementType, ArrayLength(sourceExpression))
);
if (
!destinationElementType.IsAssignableFrom(sourceElementType) ||
configurationProvider.FindTypeMapFor(
sourceElementType,
destinationElementType
) != null
)
{
return(null);
}
return(Block(
new[] { destination },
createDestination,
Call(sourceExpression, CopyToMethod, destination, Zero),
destination
));
}
Expression MapFromIEnumerable()
{
var iEnumerableType = sourceType.GetIEnumerableType();
if (
iEnumerableType == null ||
(sourceElementType = iEnumerableType.GenericTypeArguments[0])
!= destinationElementType ||
configurationProvider.FindTypeMapFor(
sourceElementType,
destinationElementType
) != null
)
{
return(null);
}
return(Call(
ToArrayMethod.MakeGenericMethod(sourceElementType),
sourceExpression
));
}
}
