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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"
"io"
"io/ioutil"
"reflect"
)
// This is a reusable decoder.
// This should not be used by more than one goroutine at the time.
type Decoder struct {
fs *fflib.FFLexer
}
// NewDecoder returns a reusable Decoder.
func NewDecoder() *Decoder {
return &Decoder{}
}
// Decode the data in the supplied data slice.
func (d *Decoder) Decode(data []byte, v interface{}) error {
f, ok := v.(unmarshalFaster)
if ok {
if d.fs == nil {
d.fs = fflib.NewFFLexer(data)
} else {
d.fs.Reset(data)
}
return f.UnmarshalJSONFFLexer(d.fs, fflib.FFParse_map_start)
}
um, ok := v.(json.Unmarshaler)
if ok {
return um.UnmarshalJSON(data)
}
return json.Unmarshal(data, v)
}
// Decode the data from the supplied reader.
// You should expect that data is read into memory before it is decoded.
func (d *Decoder) DecodeReader(r io.Reader, v interface{}) error {
_, ok := v.(unmarshalFaster)
_, ok2 := v.(json.Unmarshaler)
if ok || ok2 {
data, err := ioutil.ReadAll(r)
if err != nil {
return err
}
defer fflib.Pool(data)
return d.Decode(data, v)
}
dec := json.NewDecoder(r)
return dec.Decode(v)
}
// DecodeFast will unmarshal the data if fast unmarshal 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
// regular Decode() method.
func (d *Decoder) DecodeFast(data []byte, v interface{}) error {
f, ok := v.(unmarshalFaster)
if !ok {
return errors.New("ffjson unmarshal not available for type " + reflect.TypeOf(v).String())
}
if d.fs == nil {
d.fs = fflib.NewFFLexer(data)
} else {
d.fs.Reset(data)
}
return f.UnmarshalJSONFFLexer(d.fs, fflib.FFParse_map_start)
}
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