public Object Compute(Object input, EvaluateParams evaluateParams)
{
return(_caster.Invoke(input));
}
public VariantPropertyDesc ResolveProperty(String propertyName, EventType[] variants)
{
bool existsInAll = true;
Type commonType = null;
bool mustCoerce = false;
for (int i = 0; i < variants.Length; i++)
{
Type type = variants[i].GetPropertyType(propertyName); //.GetBoxedType();
if (type == null)
{
existsInAll = false;
continue;
}
if (commonType == null)
{
commonType = type;
continue;
}
// compare types
if (type == commonType)
{
continue;
}
if (type.GetBoxedType() == commonType.GetBoxedType())
{
commonType = commonType.GetBoxedType();
continue;
}
// coercion
if (type.IsNumeric())
{
if (TypeHelper.CanCoerce(type, commonType))
{
mustCoerce = true;
continue;
}
if (TypeHelper.CanCoerce(commonType, type))
{
mustCoerce = true;
commonType = type;
}
}
else if (commonType == typeof(Object))
{
continue;
}
// common interface or base class
else if (!type.IsBuiltinDataType())
{
var supersForType = new FIFOHashSet <Type>();
TypeHelper.GetBase(type, supersForType);
supersForType.Remove(typeof(Object));
if (supersForType.Contains(commonType))
{
continue; // type, or : common type
}
if (TypeHelper.IsSubclassOrImplementsInterface(commonType, type))
{
commonType = type; // common type : type
continue;
}
// find common interface or type both implement
var supersForCommonType = new FIFOHashSet <Type>();
TypeHelper.GetBase(commonType, supersForCommonType);
supersForCommonType.Remove(typeof(Object));
// Take common classes first, ignoring interfaces
bool found = false;
foreach (Type superClassType in supersForType)
{
if (!superClassType.IsInterface && (supersForCommonType.Contains(superClassType)))
{
break;
}
}
if (found)
{
continue;
}
// Take common interfaces
foreach (var superClassType in supersForType)
{
if (superClassType.IsInterface && supersForCommonType.Contains(superClassType))
{
commonType = superClassType;
found = true;
break;
}
}
}
commonType = typeof(Object);
}
if (!existsInAll)
{
return(null);
}
if (commonType == null)
{
return(null);
}
// property numbers should start at zero since the serve as array index
var assignedPropertyNumber = currentPropertyNumber;
currentPropertyNumber++;
propertyGetterCache.AddGetters(assignedPropertyNumber, propertyName);
EventPropertyGetter getter;
if (mustCoerce)
{
SimpleTypeCaster caster = SimpleTypeCasterFactory.GetCaster(null, commonType);
getter = new ProxyEventPropertyGetter
{
ProcGet = eventBean =>
{
var variant = (VariantEvent)eventBean;
var propertyGetter = propertyGetterCache.GetGetter(assignedPropertyNumber, variant.UnderlyingEventBean.EventType);
if (propertyGetter == null)
{
return(null);
}
var value = propertyGetter.Get(variant.UnderlyingEventBean);
if (value == null)
{
return(value);
}
return(caster.Invoke(value));
},
ProcGetFragment = eventBean => null,
ProcIsExistsProperty = eventBean =>
{
var variant = (VariantEvent)eventBean;
var propertyGetter = propertyGetterCache.GetGetter(assignedPropertyNumber, variant.UnderlyingEventBean.EventType);
if (propertyGetter == null)
{
return(false);
}
return(propertyGetter.IsExistsProperty(variant.UnderlyingEventBean));
}
};
}
else
{
getter = new ProxyEventPropertyGetter
{
ProcGet = eventBean =>
{
var variant = (VariantEvent)eventBean;
var propertyGetter = propertyGetterCache.GetGetter(assignedPropertyNumber, variant.UnderlyingEventBean.EventType);
if (propertyGetter == null)
{
return(null);
}
return(propertyGetter.Get(variant.UnderlyingEventBean));
},
ProcGetFragment = eventBean => null,
ProcIsExistsProperty = eventBean =>
{
var variant = (VariantEvent)eventBean;
var propertyGetter = propertyGetterCache.GetGetter(assignedPropertyNumber, variant.UnderlyingEventBean.EventType);
if (propertyGetter == null)
{
return(false);
}
return(propertyGetter.IsExistsProperty(variant.UnderlyingEventBean));
}
};
}
return(new VariantPropertyDesc(commonType, getter, true));
}