return true;
}
}
private static void addBuiltInFunction(Class<? extends FunctionExpression> f) throws Exception {
BuiltInFunction d = f.getAnnotation(BuiltInFunction.class);
if (d == null) {
return;
}
int nArgs = d.args().length;
BuiltInFunctionInfo value = new BuiltInFunctionInfo(f, d);
do {
// Add function to function map, throwing if conflicts found
// Add entry for each possible version of function based on arguments that are not required to be present (i.e. arg with default value)
BuiltInFunctionKey key = new BuiltInFunctionKey(value.getName(), nArgs);
if (BUILT_IN_FUNCTION_MAP.put(key, value) != null) {
throw new IllegalStateException("Multiple " + value.getName() + " functions with " + nArgs + " arguments");
}
} while (--nArgs >= 0 && d.args()[nArgs].defaultValue().length() > 0);
// Look for default values that aren't at the end and throw
while (--nArgs >= 0) {
if (d.args()[nArgs].defaultValue().length() > 0) {
throw new IllegalStateException("Function " + value.getName() + " has non trailing default value of '" + d.args()[nArgs].defaultValue() + "'. Only trailing arguments may have default values");
}
}
}