series_validation.go

// Copyright 2018-20 PJ Engineering and Business Solutions Pty. Ltd. All rights reserved.

package dataframe

import (
	"fmt"
	"reflect"
)

// checkConcreteType checks if ct is the zero-value of a concrete data type
func checkConcreteType(ct interface{}) error {

	if ct == nil {
		return fmt.Errorf("%v is not a valid concrete type", ct)
	}

	// Reject unacceptable types
	s := reflect.ValueOf(ct)
	switch s.Kind() {
	case reflect.Bool, reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
		reflect.Float32, reflect.Float64, reflect.Complex64, reflect.Complex128,
		reflect.String, reflect.Struct:

		// Make sure concrete type is zero value
		if !reflect.DeepEqual(ct, reflect.Zero(reflect.TypeOf(ct)).Interface()) {
			return fmt.Errorf("%v is not the zero value", ct)
		}
	default:
		return fmt.Errorf("%T is not a valid concrete type", ct)
	}

	return nil
}

// checkValue checks if an input value is valid.
// In order to be valid, it must be either nil or
// a non-pointer of the same type as the series's
// concrete type.
func (s *SeriesGeneric) checkValue(v interface{}) error {

	if v == nil {
		return nil
	}

	// Check if v is a pointer
	if reflect.TypeOf(v) != reflect.TypeOf(s.concreteType) {
		return fmt.Errorf("%v: value is invalid type", v)
	}

	return nil
}