validate method
- @protected
Throws if chain and type contains values not valid for a line string.
This method is designed to be used only on constructors.
Implementation
@protected
void validate() {
if (chain.isEmpty) return;
switch (type) {
case LineStringType.ring:
if (chain.length < 4) {
throw ArgumentError('A linear ring must have 0 or >= 4 points.');
}
if (!chain.isClosed) {
throw ArgumentError('A linear ring must be closed.');
}
break;
case LineStringType.any:
if (chain.length < 2) {
throw ArgumentError('LineString must have 0 or >= 2 points.');
}
break;
}
}