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package ffjson
/**
* Copyright 2015 Paul Querna, Klaus Post
*
* 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.
*
*/
import (
"encoding/json"
"errors"
fflib "github.com/pquerna/ffjson/fflib/v1"
"reflect"
)
type marshalerFaster interface {
MarshalJSONBuf(buf fflib.EncodingBuffer) error
}
type unmarshalFaster interface {
UnmarshalJSONFFLexer(l *fflib.FFLexer, state fflib.FFParseState) error
}
// Marshal will act the same way as json.Marshal, except
// it will choose the ffjson marshal function before falling
// back to using json.Marshal.
// Using this function will bypass the internal copying and parsing
// the json library normally does, which greatly speeds up encoding time.
// It is ok to call this function even if no ffjson code has been
// generated for the data type you pass in the interface.
func Marshal(v interface{}) ([]byte, error) {
f, ok := v.(marshalerFaster)
if ok {
buf := fflib.Buffer{}
err := f.MarshalJSONBuf(&buf)
b := buf.Bytes()
if err != nil {
if len(b) > 0 {
Pool(b)
}
return nil, err
}
return b, nil
}
j, ok := v.(json.Marshaler)
if ok {
return j.MarshalJSON()
}
return json.Marshal(v)
}
// MarshalFast will marshal the data if fast marshal is available.
// This function can be used if you want to be sure the fast
// marshal is used or in testing.
// If you would like to have fallback to encoding/json you can use the
// Marshal() method.
func MarshalFast(v interface{}) ([]byte, error) {
_, ok := v.(marshalerFaster)
if !ok {
return nil, errors.New("ffjson marshal not available for type " + reflect.TypeOf(v).String())
}
return Marshal(v)
}
// Unmarshal will act the same way as json.Unmarshal, except
// it will choose the ffjson unmarshal function before falling
// back to using json.Unmarshal.
// The overhead of unmarshal is lower than on Marshal,
// however this should still provide a speedup for your encoding.
// It is ok to call this function even if no ffjson code has been
// generated for the data type you pass in the interface.
func Unmarshal(data []byte, v interface{}) error {
f, ok := v.(unmarshalFaster)
if ok {
fs := fflib.NewFFLexer(data)
return f.UnmarshalJSONFFLexer(fs, fflib.FFParse_map_start)
}
j, ok := v.(json.Unmarshaler)
if ok {
return j.UnmarshalJSON(data)
}
return json.Unmarshal(data, v)
}
// UnmarshalFast will unmarshal the data if fast marshall is available.
// This function can be used if you want to be sure the fast
// unmarshal is used or in testing.
// If you would like to have fallback to encoding/json you can use the
// Unmarshal() method.
func UnmarshalFast(data []byte, v interface{}) error {
_, ok := v.(unmarshalFaster)
if !ok {
return errors.New("ffjson unmarshal not available for type " + reflect.TypeOf(v).String())
}
return Unmarshal(data, v)
}
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