/// <summary>
/// Returns the widener.
/// </summary>
/// <param name="columnName">name of column</param>
/// <param name="columnType">type of column</param>
/// <param name="writeablePropertyType">property type</param>
/// <param name="writeablePropertyName">propery name</param>
/// <param name="allowObjectArrayToCollectionConversion">whether we widen object-array to collection</param>
/// <param name="customizer">customization if any</param>
/// <param name="statementName">statement name</param>
/// <returns>type widener</returns>
/// <throws>TypeWidenerException if type validation fails</throws>
public static TypeWidenerSPI GetCheckPropertyAssignType(
string columnName,
Type columnType,
Type writeablePropertyType,
string writeablePropertyName,
bool allowObjectArrayToCollectionConversion,
TypeWidenerCustomizer customizer,
string statementName)
{
var columnTypeBoxed = columnType.GetBoxedType();
var targetTypeBoxed = writeablePropertyType.GetBoxedType();
var custom = customizer?.WidenerFor(
columnName,
columnType,
writeablePropertyType,
writeablePropertyName,
statementName);
if (custom != null) {
return custom;
}
if (columnType == null) {
if (writeablePropertyType.CanNotBeNull()) {
var message = "Invalid assignment of column '" +
columnName +
"' of null type to event property '" +
writeablePropertyName +
"' typed as '" +
writeablePropertyType.CleanName() +
"', nullable type mismatch";
throw new TypeWidenerException(message);
}
}
else if (columnTypeBoxed != targetTypeBoxed) {
if (columnTypeBoxed == typeof(string) && targetTypeBoxed == typeof(char?)) {
return STRING_TO_CHAR_COERCER;
}
if (allowObjectArrayToCollectionConversion &&
columnTypeBoxed.IsArray &&
!columnTypeBoxed.GetElementType().IsValueType &&
targetTypeBoxed.IsImplementsInterface(typeof(ICollection<object>))) {
return OBJECT_ARRAY_TO_COLLECTION_COERCER;
}
// Boxed types tend to be incompatible from an assignment perspective. We have both
// the boxed and unboxed values. The problem is that the boxed values will always
// be unboxed prior to assignment, so looking for assignment of boxed types is not
// a winning approach.
var columnTypeUnboxed = columnType.GetUnboxedType();
var targetTypeUnboxed = targetTypeBoxed.GetUnboxedType();
if (!columnType.IsAssignmentCompatible(writeablePropertyType) &&
!columnTypeUnboxed.IsAssignmentCompatible(targetTypeUnboxed)) {
// Arrays can be assigned to each other if the underlying target types
// can be assigned from one another.
if (columnType.IsArray &&
targetTypeBoxed.IsArray &&
columnType.GetArrayRank() == targetTypeBoxed.GetArrayRank()) {
var columnElementType = columnType.GetElementType();
var targetElementType = targetTypeBoxed.GetElementType();
if (columnElementType.IsAssignmentCompatible(targetElementType)) {
return new TypeWidenerCompatibleArrayCoercer(
columnElementType,
targetElementType);
}
}
var writablePropName = writeablePropertyType.CleanName();
if (writeablePropertyType.IsArray) {
writablePropName = writeablePropertyType.GetElementType().CleanName() + "[]";
}
var columnTypeName = columnType.CleanName();
if (columnType.IsArray) {
columnTypeName = columnType.GetElementType().CleanName() + "[]";
}
var message = "Invalid assignment of column '" +
columnName +
"' of type '" +
columnTypeName +
"' to event property '" +
writeablePropertyName +
"' typed as '" +
writablePropName +
"', column and parameter types mismatch";
throw new TypeWidenerException(message);
}
if (writeablePropertyType.IsNumeric()) {
return new TypeWidenerBoxedNumeric(
SimpleNumberCoercerFactory.GetCoercer(columnTypeBoxed, targetTypeBoxed));
}
}
return null;
}