json-convience.go

package myjson

import (
	"fmt"
	"strings"
)

type JsonData map[string]interface{}

func (d JsonData) Int64(dotPath string) (int64, error) {
	value := d.Value(dotPath)
	if val, ok := value.(float64); ok {
		return int64(val), nil
	} else {
		return 0, fmt.Errorf("parse error: expected %v at %v to be float64, but was %T", value, dotPath, value)
	}
}

func (d JsonData) String(dotPath string) (string, error) {
	value := d.Value(dotPath)
	if val, ok := value.(string); ok {
		return val, nil
	} else {
		return "", fmt.Errorf("parse error: expected %v at %v to be string, but was %T", value, dotPath, value)
	}
}

func (d JsonData) Value(dotPath string) interface{} {
	keys := strings.Split(dotPath, ".")
	var current interface{}
	current = d
	for i := 0; i < len(keys); i++ {
		switch current.(type) {
		case JsonData:
			current = (current.(JsonData))[keys[i]]
		case map[string]interface{}:
			current = (current.(map[string]interface{}))[keys[i]]
		default:
			return nil
		}
	}
	return current
}