Golang Map.Get方法代碼示例

func (m Manifest) getAppMaps(data generic.Map) (apps []generic.Map, errs []error) {
	globalProperties := data.Except([]interface{}{"applications"})

	if data.Has("applications") {
		appMaps, ok := data.Get("applications").([]interface{})
		if !ok {
			errs = append(errs, errors.New(T("Expected applications to be a list")))
			return
		}

		for _, appData := range appMaps {
			if !generic.IsMappable(appData) {
				errs = append(errs, errors.NewWithFmt(T("Expected application to be a list of key/value pairs\nError occurred in manifest near:\n'{{.YmlSnippet}}'",
					map[string]interface{}{"YmlSnippet": appData})))
				continue
			}

			appMap := generic.DeepMerge(globalProperties, generic.NewMap(appData))
			apps = append(apps, appMap)
		}
	} else {
		apps = append(apps, globalProperties)
	}

	return
}

func formatDescription(metadata generic.Map, keys []string) string {
	parts := []string{}
	for _, key := range keys {
		value := metadata.Get(key)
		if value != nil {
			parts = append(parts, fmt.Sprintf("%s: %s", key, formatDescriptionPart(value)))
		}
	}
	return strings.Join(parts, ", ")
}

func stringVal(yamlMap generic.Map, key string, errs *[]error) *string {
	val := yamlMap.Get(key)
	if val == nil {
		return nil
	}
	result, ok := val.(string)
	if !ok {
		*errs = append(*errs, errors.NewWithFmt(T("{{.PropertyName}} must be a string value", map[string]interface{}{"PropertyName": key})))
		return nil
	}
	return &result
}

func bytesVal(yamlMap generic.Map, key string, errs *[]error) *int64 {
	yamlVal := yamlMap.Get(key)
	if yamlVal == nil {
		return nil
	}
	value, err := formatters.ToMegabytes(yamlVal.(string))
	if err != nil {
		*errs = append(*errs, errors.NewWithFmt(T("Unexpected value for {{.PropertyName}} :\n{{.Error}}",
			map[string]interface{}{"PropertyName": key, "Error": err.Error()})))
		return nil
	}
	return &value
}

func sliceOrEmptyVal(yamlMap generic.Map, key string, errs *[]error) *[]string {
	if !yamlMap.Has(key) {
		return new([]string)
	}

	var (
		stringSlice []string
		err         error
	)

	sliceErr := errors.NewWithFmt(T("Expected {{.PropertyName}} to be a list of strings.",
		map[string]interface{}{"PropertyName": key}))

	switch input := yamlMap.Get(key).(type) {
	case []interface{}:
		for _, value := range input {
			stringValue, ok := value.(string)
			if !ok {
				err = sliceErr
				break
			}
			stringSlice = append(stringSlice, stringValue)
		}
	default:
		err = sliceErr
	}

	if err != nil {
		*errs = append(*errs, err)
		return nil
	}

	return &stringSlice
}

func intVal(yamlMap generic.Map, key string, errs *[]error) *int {
	var (
		intVal int
		err    error
	)

	switch val := yamlMap.Get(key).(type) {
	case string:
		intVal, err = strconv.Atoi(val)
	case int:
		intVal = val
	case int64:
		intVal = int(val)
	case nil:
		return nil
	default:
		err = errors.NewWithFmt(T("Expected {{.PropertyName}} to be a number, but it was a {{.PropertyType}}.",
			map[string]interface{}{"PropertyName": key, "PropertyType": val}))
	}

	if err != nil {
		*errs = append(*errs, err)
		return nil
	}

	return &intVal
}

func envVarOrEmptyMap(yamlMap generic.Map, errs *[]error) *map[string]string {
	key := "env"
	switch envVars := yamlMap.Get(key).(type) {
	case nil:
		aMap := make(map[string]string, 0)
		return &aMap
	case map[string]interface{}:
		yamlMap.Set(key, generic.NewMap(yamlMap.Get(key)))
		return envVarOrEmptyMap(yamlMap, errs)
	case map[interface{}]interface{}:
		yamlMap.Set(key, generic.NewMap(yamlMap.Get(key)))
		return envVarOrEmptyMap(yamlMap, errs)
	case generic.Map:
		merrs := validateEnvVars(envVars)
		if merrs != nil {
			*errs = append(*errs, merrs...)
			return nil
		}

		result := make(map[string]string, envVars.Count())
		generic.Each(envVars, func(key, value interface{}) {

			switch value.(type) {
			case string:
				result[key.(string)] = value.(string)
			case int64, int, int32:
				result[key.(string)] = fmt.Sprintf("%d", value)
			case float32, float64:
				result[key.(string)] = fmt.Sprintf("%f", value)
			default:
				*errs = append(*errs, errors.NewWithFmt(T("Expected environment variable {{.PropertyName}} to have a string value, but it was a {{.PropertyType}}.",
					map[string]interface{}{"PropertyName": key, "PropertyType": value})))
			}

		})
		return &result
	default:
		*errs = append(*errs, errors.NewWithFmt(T("Expected {{.Name}} to be a set of key => value, but it was a {{.Type}}.",
			map[string]interface{}{"Name": key, "Type": envVars})))
		return nil
	}
}

func boolVal(yamlMap generic.Map, key string, errs *[]error) bool {
	switch val := yamlMap.Get(key).(type) {
	case nil:
		return false
	case bool:
		return val
	case string:
		return val == "true"
	default:
		*errs = append(*errs, errors.NewWithFmt(T("Expected {{.PropertyName}} to be a boolean.", map[string]interface{}{"PropertyName": key})))
		return false
	}
}

func stringValOrDefault(yamlMap generic.Map, key string, errs *[]error) *string {
	if !yamlMap.Has(key) {
		return nil
	}
	empty := ""
	switch val := yamlMap.Get(key).(type) {
	case string:
		if val == "default" {
			return &empty
		} else {
			return &val
		}
	case nil:
		return &empty
	default:
		*errs = append(*errs, errors.NewWithFmt(T("{{.PropertyName}} must be a string or null value", map[string]interface{}{"PropertyName": key})))
		return nil
	}
}