func appendComparisonCondition()

in dax/internal/client/legacy.go [466:524]
59 lines of code
20 McCabe index (conditional complexity)

func appendComparisonCondition(in []byte, a string, op string, avl []*dynamodb.AttributeValue, subs map[string]*string, vars map[string]*dynamodb.AttributeValue, keyCondition bool) ([]byte, map[string]*string, map[string]*dynamodb.AttributeValue, error) {
	switch op {
	case dynamodb.ComparisonOperatorBetween:
		return appendBetweenCondition(in, a, op, avl, subs, vars)
	case dynamodb.ComparisonOperatorBeginsWith:
		return appendBeginsWithCondition(in, a, op, avl, subs, vars)
	case dynamodb.ComparisonOperatorContains:
		if err := validateNotKeyCondition(keyCondition, op); err != nil {
			return in, subs, vars, err
		}
		return appendContainsCondition(in, a, op, avl, subs, vars, true)
	case dynamodb.ComparisonOperatorNotContains:
		if err := validateNotKeyCondition(keyCondition, op); err != nil {
			return in, subs, vars, err
		}
		return appendContainsCondition(in, a, op, avl, subs, vars, false)
	case dynamodb.ComparisonOperatorNull:
		if err := validateNotKeyCondition(keyCondition, op); err != nil {
			return in, subs, vars, err
		}
		var err error
		in, subs, err = appendNullCondition(in, a, op, avl, subs, true)
		return in, subs, vars, err
	case dynamodb.ComparisonOperatorNotNull:
		if err := validateNotKeyCondition(keyCondition, op); err != nil {
			return in, subs, vars, err
		}
		var err error
		in, subs, err = appendNullCondition(in, a, op, avl, subs, false)
		return in, subs, vars, err
	case dynamodb.ComparisonOperatorIn:
		if err := validateNotKeyCondition(keyCondition, op); err != nil {
			return in, subs, vars, err
		}
		return appendInCondition(in, a, op, avl, subs, vars)
	default:
		var eop string
		switch op {
		case dynamodb.ComparisonOperatorEq:
			eop = "="
		case dynamodb.ComparisonOperatorNe:
			if err := validateNotKeyCondition(keyCondition, op); err != nil {
				return in, subs, vars, err
			}
			eop = "<>"
		case dynamodb.ComparisonOperatorLe:
			eop = "<="
		case dynamodb.ComparisonOperatorGe:
			eop = ">="
		case dynamodb.ComparisonOperatorLt:
			eop = "<"
		case dynamodb.ComparisonOperatorGt:
			eop = ">"
		default:
			return in, subs, vars, awserr.New(ErrCodeValidationException, fmt.Sprintf("Unknown comparison operator: %s", op), nil)
		}
		return appendArithmeticComparisonCondition(in, a, eop, avl, subs, vars)
	}
}