public FilterPredicate(string propertyNameOverride, scan_context ctx, PropertyInfo pi, FilterBinaryOperator op = FilterBinaryOperator.Eq)
{
_contextExpression = ctx.Expression;
_propertyName = propertyNameOverride;
_path = ctx.Path + _propertyName;
_propInfo = ctx.CtxType.GetProperty(_propertyName); // ReflectionHelper.GetPropertyFromPath(ctx.CtxType, _path);
_operator = op;
_propertyValueSnapshot = null;
}
public Filter(FoType fo, FilterBinaryOperator op = FilterBinaryOperator.And)
{
Fo = fo;
_op = op;
//expression in destination object domain
_mainExpression = Expression.Parameter(typeof(ContextType), "o");
_predicates = new Dictionary <string, IFilterExpression <FoType> >();
scanCustomAttributes(fo.GetType(), "", typeof(ContextType), _mainExpression);
//GetSnapshot(fo);
}
private void handleOneProperty(PropertyInfo pi, PropertyInfo metaPi = null)
{
//we can have complex types
if (pi != null)
{
FilterBinaryOperator op = FilterBinaryOperator.Eq;
string propertyName = pi.Name;
string propertyPath = _scan_ctx.Path + pi.Name;
#if DEBUG_TRACE_LOG_ON
manager.SLogManager.getInstance().getClassLogger(this.GetType()).Debug("Make filter predicate for : " + propertyPath);
#endif
bool skip = false;
try {
var attr = pi.GetCustomAttributes(typeof(FilterPredicateAttribute), true);
if (attr.Count() > 0)
{
FilterPredicateAttribute fpa = (attr[0] as FilterPredicateAttribute);
// handle eventual overrides
op = fpa.Operator;
skip = fpa.SkipProperty;
}
//check also meta info if present
if (metaPi != null)
{
attr = metaPi.GetCustomAttributes(typeof(FilterPredicateAttribute), true);
if (attr.Count() > 0)
{
FilterPredicateAttribute fpa = (attr[0] as FilterPredicateAttribute);
// handle eventual overrides
op = fpa.Operator;
skip = fpa.SkipProperty;
}
}
}
catch (Exception) {}
if (skip)
{
return; //skipped property
}
if (pi.PropertyType.FullName == "System.String" || pi.PropertyType.IsPrimitive || pi.PropertyType.FullName == "System.DateTime" || pi.PropertyType.IsValueType) // || pi.PropertyType.IsGenericType)
{
// direct field
if (!_predicates.ContainsKey(propertyPath))
{
_predicates[propertyPath] = new FilterPredicate <FoType>(propertyName, _scan_ctx, pi, op);
}
}
else if (pi.PropertyType.IsClass) //do recursion only for classes
{
// nested object so we have to change contexts
Type t = _scan_ctx.CtxType?.GetProperty(propertyName)?.PropertyType;
if (t != null)
{
scanCustomAttributes(
// Fo domain
pi.PropertyType,
propertyName,
// Filtered domain
t,
Expression.Property(_scan_ctx.Expression, _scan_ctx.CtxType.GetProperty(propertyName))
);
}
}
}
}
