github.com/e154/smart-home@v0.17.2-0.20240311175135-e530a6e5cd45/common/copy.go (about)

     1  // This file is part of the Smart Home
     2  // Program complex distribution https://github.com/e154/smart-home
     3  // Copyright (C) 2016-2023, Filippov Alex
     4  //
     5  // This library is free software: you can redistribute it and/or
     6  // modify it under the terms of the GNU Lesser General Public
     7  // License as published by the Free Software Foundation; either
     8  // version 3 of the License, or (at your option) any later version.
     9  //
    10  // This library is distributed in the hope that it will be useful,
    11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13  // Library General Public License for more details.
    14  //
    15  // You should have received a copy of the GNU Lesser General Public
    16  // License along with this library.  If not, see
    17  // <https://www.gnu.org/licenses/>.
    18  
    19  package common
    20  
    21  import (
    22  	"bytes"
    23  	"encoding/gob"
    24  	"encoding/json"
    25  
    26  	"github.com/francoispqt/gojay"
    27  	"github.com/jinzhu/copier"
    28  )
    29  
    30  // CopyEngine ...
    31  type CopyEngine string
    32  
    33  const (
    34  	// JsonEngine ...
    35  	JsonEngine = CopyEngine("json")
    36  	// GobEngine ...
    37  	GobEngine = CopyEngine("gob")
    38  	// GojayEngine ...
    39  	GojayEngine = CopyEngine("gojay")
    40  )
    41  
    42  func gobCopy(to, from interface{}) (err error) {
    43  	buff := new(bytes.Buffer)
    44  	if err = gob.NewEncoder(buff).Encode(from); err != nil {
    45  		return
    46  	}
    47  	err = gob.NewDecoder(buff).Decode(to)
    48  	return
    49  }
    50  
    51  func jsonCopy(to, from interface{}) (err error) {
    52  	var b []byte
    53  	if b, err = json.Marshal(from); err != nil {
    54  		return
    55  	}
    56  	err = json.Unmarshal(b, to)
    57  	return
    58  }
    59  
    60  func gojayCopy(to, from interface{}) (err error) {
    61  	var b []byte
    62  	if b, err = gojay.Marshal(from); err != nil {
    63  		return
    64  	}
    65  	err = gojay.Unmarshal(b, to)
    66  	return
    67  }
    68  
    69  // Copy ...
    70  func Copy(to, from interface{}, params ...CopyEngine) (err error) {
    71  
    72  	if len(params) == 0 {
    73  		err = copier.Copy(to, from)
    74  		return
    75  	}
    76  
    77  	switch params[0] {
    78  	case JsonEngine:
    79  		err = jsonCopy(to, from)
    80  	case GobEngine:
    81  		err = gobCopy(to, from)
    82  	default:
    83  		err = gojayCopy(to, from)
    84  
    85  	}
    86  
    87  	return
    88  }