public boolean canCastFrom(SqlTypeName to, SqlTypeName from, boolean coerce) {
assert (null != to);
assert (null != from);
Map<SqlTypeName, Set<SqlTypeName>> ruleset = coerce ? coerceRules : rules;
if (to.equals(SqlTypeName.NULL)) {
return false;
} else if (from.equals(SqlTypeName.NULL)) {
return true;
}
Set<SqlTypeName> rule = ruleset.get(to);
if (null == rule) {
// if you hit this assert, see the constructor of this class on how
// to add new rule
throw Util.newInternal("No assign rules for " + to + " defined");
}
return rule.contains(from);
}
