mirror of https://github.com/knative/client.git
66 lines
1.4 KiB
Go
66 lines
1.4 KiB
Go
/*
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Copyright 2021 The CloudEvents Authors
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SPDX-License-Identifier: Apache-2.0
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*/
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package utils
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import (
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"fmt"
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"strconv"
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"strings"
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cesql "github.com/cloudevents/sdk-go/sql/v2"
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)
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func Cast(val interface{}, target cesql.Type) (interface{}, error) {
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if target.IsSameType(val) {
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return val, nil
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}
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switch target {
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case cesql.StringType:
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switch val.(type) {
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case int32:
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return strconv.Itoa(int(val.(int32))), nil
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case bool:
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if val.(bool) {
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return "true", nil
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} else {
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return "false", nil
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}
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}
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// Casting to string is always defined
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return fmt.Sprintf("%v", val), nil
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case cesql.IntegerType:
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switch val.(type) {
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case string:
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v, err := strconv.Atoi(val.(string))
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if err != nil {
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err = fmt.Errorf("cannot cast from String to Integer: %w", err)
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}
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return int32(v), err
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}
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return 0, fmt.Errorf("undefined cast from %v to %v", cesql.TypeFromVal(val), target)
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case cesql.BooleanType:
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switch val.(type) {
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case string:
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lowerCase := strings.ToLower(val.(string))
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if lowerCase == "true" {
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return true, nil
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} else if lowerCase == "false" {
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return false, nil
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}
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return false, fmt.Errorf("cannot cast String to Boolean, actual value: %v", val)
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}
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return false, fmt.Errorf("undefined cast from %v to %v", cesql.TypeFromVal(val), target)
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}
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// AnyType doesn't need casting
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return val, nil
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}
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func CanCast(val interface{}, target cesql.Type) bool {
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_, err := Cast(val, target)
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return err == nil
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}
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