config/utils.go

/*
 * Copyright (C) 2017 eschao <esc.chao@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package config

import (
	"fmt"
	"reflect"
	"strconv"
	"strings"
)

func SetValueWithBool(value reflect.Value, boolValue string) error {
	b, err := strconv.ParseBool(boolValue)
	if err != nil {
		return fmt.Errorf("parse bool: %w", err)
	}

	value.SetBool(b)

	return nil
}

func SetValueWithFloatX(value reflect.Value, floatValue string, bitSize int) error {
	f, err := strconv.ParseFloat(floatValue, bitSize)
	if err != nil {
		return fmt.Errorf("parse float: %w", err)
	}

	value.SetFloat(f)

	return nil
}

func SetValueWithIntX(value reflect.Value, intValue string, bitSize int) error {
	v, err := strconv.ParseInt(intValue, 10, bitSize)
	if err != nil {
		return fmt.Errorf("parse int: %w", err)
	}

	value.SetInt(v)

	return nil
}

func SetValueWithUintX(value reflect.Value, uintValue string, bitSize int) error {
	v, err := strconv.ParseUint(uintValue, 10, bitSize)
	if err != nil {
		return fmt.Errorf("parse uint: %w", err)
	}

	value.SetUint(v)

	return nil
}

func SetValueWithSlice(value reflect.Value, slice string, sep string) error {
	data := strings.Split(slice, sep)

	size := len(data)
	if size > 0 {
		slice := reflect.MakeSlice(value.Type(), size, size)

		for index := range size {
			var err error

			ele := slice.Index(index)

			kind := ele.Kind()
			switch kind {
			case reflect.Bool:
				err = SetValueWithBool(ele, data[index])
			case reflect.String:
				ele.SetString(data[index])
			case reflect.Uint8:
				err = SetValueWithUintX(ele, data[index], Uint8Size)
			case reflect.Uint16:
				err = SetValueWithUintX(ele, data[index], Uint16Size)
			case reflect.Uint, reflect.Uint32:
				err = SetValueWithUintX(ele, data[index], Uint32Size)
			case reflect.Uint64:
				err = SetValueWithUintX(ele, data[index], Uint64Size)
			case reflect.Int8:
				err = SetValueWithIntX(ele, data[index], Int8Size)
			case reflect.Int16:
				err = SetValueWithIntX(ele, data[index], Int16Size)
			case reflect.Int, reflect.Int32:
				err = SetValueWithIntX(ele, data[index], Int32Size)
			case reflect.Int64:
				err = SetValueWithIntX(ele, data[index], Int64Size)
			case reflect.Float32:
				err = SetValueWithFloatX(ele, data[index], Float32Size)
			case reflect.Float64:
				err = SetValueWithFloatX(ele, data[index], Float64Size)
			default:
				return fmt.Errorf("unsupported type: %s", kind.String())
			}

			if err != nil {
				return err
			}
		}

		value.Set(slice)
	}

	return nil
}