stardb/reflect.go

package stardb

import (
	"errors"
	"reflect"
	"time"
)

func (star *StarRows) setAllRefValue(stc interface{}, skey string, rows int) error {
	t := reflect.TypeOf(stc)
	v := reflect.ValueOf(stc)
	if t.Kind() == reflect.Ptr {
		v = v.Elem()
	}
	if t.Kind() != reflect.Ptr && !v.CanSet() {
		return errors.New("interface{} is not writable")
	}
	if t.Kind() == reflect.Ptr {
		t = t.Elem()
	}
	if v.Kind() != reflect.Struct {
		return errors.New("interface{} is not a struct")
	}

	for i := 0; i < t.NumField(); i++ {
		tp := t.Field(i)
		srFrd := v.Field(i)
		seg := tp.Tag.Get(skey)
		if seg == "" && !tp.IsExported() {
			continue
		}
		if srFrd.Kind() == reflect.Ptr && reflect.TypeOf(srFrd.Interface()).Elem().Kind() == reflect.Struct {
			if seg == "" {
				continue
			}
			if seg == "---" {
				sp := reflect.New(reflect.TypeOf(srFrd.Interface()).Elem()).Interface()
				star.setAllRefValue(sp, skey, rows)
				v.Field(i).Set(reflect.ValueOf(sp))
				continue
			}
		}
		if srFrd.Kind() == reflect.Struct {
			if seg == "" {
				continue
			}
			if seg == "---" {
				sp := reflect.New(reflect.TypeOf(v.Field(i).Interface())).Interface()
				star.setAllRefValue(sp, skey, rows)
				v.Field(i).Set(reflect.ValueOf(sp).Elem())
				continue
			}
		}
		if _, ok := star.Row(rows).columnref[seg]; !ok {
			continue
		}
		myInt64 := star.Row(rows).MustInt64(seg)
		myUint64 := star.Row(rows).MustUint64(seg)
		switch v.Field(i).Kind() {
		case reflect.String:
			v.Field(i).SetString(star.Row(rows).MustString(seg))
		case reflect.Int64:
			v.Field(i).SetInt(myInt64)
		case reflect.Int32:
			v.Field(i).SetInt(int64(star.Row(rows).MustInt32(seg)))
		case reflect.Int16:
			v.Field(i).SetInt(int64(int16(myInt64)))
		case reflect.Int8:
			v.Field(i).SetInt(int64(int8(myInt64)))
		case reflect.Uint64:
			v.Field(i).SetUint(myUint64)
		case reflect.Uint32:
			v.Field(i).SetUint(uint64(uint32(myUint64)))
		case reflect.Uint16:
			v.Field(i).SetUint(uint64(uint16(myUint64)))
		case reflect.Uint8:
			v.Field(i).SetUint(uint64(uint8(myUint64)))
		case reflect.Bool:
			v.Field(i).SetBool(star.Row(rows).MustBool(seg))
		case reflect.Float64:
			v.Field(i).SetFloat(star.Row(rows).MustFloat64(seg))
		case reflect.Float32:
			v.Field(i).SetFloat(float64(star.Row(rows).MustFloat32(seg)))
		case reflect.Slice, reflect.Array:
			if t.Field(i).Type.Elem().Kind() == reflect.Uint8 {
				v.Field(i).SetBytes(star.Row(rows).MustBytes(seg))
			}
		case reflect.Interface, reflect.Struct, reflect.Ptr:
			inf := star.Row(rows).Result[star.columnref[seg]]
			switch vtype := inf.(type) {
			case time.Time:
				v.Field(i).Set(reflect.ValueOf(vtype))
			}
		default:
		}

	}
	return nil
}

func setRefValue(stc interface{}, skey, key string, value interface{}) error {
	t := reflect.TypeOf(stc)
	v := reflect.ValueOf(stc).Elem()
	if t.Kind() != reflect.Ptr || !v.CanSet() {
		return errors.New("interface{} is not writable")
	}
	if v.Kind() != reflect.Struct {
		return errors.New("interface{} is not a struct")
	}
	t = t.Elem()
	for i := 0; i < t.NumField(); i++ {
		tp := t.Field(i)
		seg := tp.Tag.Get(skey)
		if seg == "" || key != seg {
			continue
		}
		v.Field(i).Set(reflect.ValueOf(value))
	}
	return nil
}

func getAllRefValue(stc interface{}, skey string) (map[string]interface{}, error) {
	result := make(map[string]interface{})
	t := reflect.TypeOf(stc)
	v := reflect.ValueOf(stc)
	if t.Kind() == reflect.Ptr {
		if v.IsNil() {
			return nil, errors.New("ptr interface{} is nil")
		}
		t = t.Elem()
		v = v.Elem()
	}
	if v.Kind() != reflect.Struct {
		return nil, errors.New("interface{} is not a struct")
	}
	for i := 0; i < t.NumField(); i++ {
		tp := t.Field(i)
		srFrd := v.Field(i)
		seg := tp.Tag.Get(skey)
		if seg == "" && !tp.IsExported() {
			continue
		}
		if srFrd.Kind() == reflect.Ptr && reflect.TypeOf(srFrd.Interface()).Elem().Kind() == reflect.Struct {
			if srFrd.IsNil() {
				continue
			}
			if seg == "---" {
				res, err := getAllRefValue(reflect.ValueOf(srFrd.Elem().Interface()).Interface(), skey)
				if err != nil {
					return result, err
				}
				for k, v := range res {
					result[k] = v
				}
				continue
			}
		}
		if v.Field(i).Kind() == reflect.Struct {
			res, err := getAllRefValue(v.Field(i).Interface(), skey)
			if seg == "---" {
				if err != nil {
					return result, err
				}
				for k, v := range res {
					result[k] = v
				}
				continue
			}
		}
		if seg == "" {
			continue
		}
		value := v.Field(i)
		if !value.CanInterface() {
			continue
		}
		result[seg] = value.Interface()
	}
	return result, nil
}

func getAllRefKey(stc interface{}, skey string) ([]string, error) {
	var result []string
	_, isStruct := isWritableStruct(stc)
	if !isStruct {
		return []string{}, errors.New("interface{} is not a struct")
	}
	t := reflect.TypeOf(stc)
	v := reflect.ValueOf(stc)
	if t.Kind() == reflect.Ptr {
		if v.IsNil() {
			return []string{}, errors.New("ptr interface{} is nil")
		}
		t = t.Elem()
		v = v.Elem()
	}
	for i := 0; i < t.NumField(); i++ {
		srFrd := v.Field(i)
		profile := t.Field(i)
		seg := profile.Tag.Get(skey)
		if seg == "" && !profile.IsExported() {
			continue
		}
		if srFrd.Kind() == reflect.Ptr && reflect.TypeOf(srFrd.Interface()).Elem().Kind() == reflect.Struct {
			if srFrd.IsNil() {
				continue
			}
			if seg == "---" {
				res, err := getAllRefKey(reflect.ValueOf(srFrd.Elem().Interface()).Interface(), skey)
				if err != nil {
					return result, err
				}
				for _, v := range res {
					result = append(result, v)
				}
				continue
			}
		}
		if v.Field(i).Kind() == reflect.Struct && seg == "---" {
			res, err := getAllRefKey(v.Field(i).Interface(), skey)
			if err != nil {
				return result, err
			}
			for _, v := range res {
				result = append(result, v)
			}
		}
		if seg != "" {
			result = append(result, seg)
		}
	}
	return result, nil
}

func isWritableStruct(stc interface{}) (isWritable bool, isStruct bool) {
	t := reflect.TypeOf(stc)
	v := reflect.ValueOf(stc)
	if t.Kind() == reflect.Ptr || v.CanSet() {
		isWritable = true
	}
	if v.Kind() == reflect.Struct {
		isStruct = true
	}
	return
}