93 lines
2.4 KiB
Go
93 lines
2.4 KiB
Go
package ffjson
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/**
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* Copyright 2015 Paul Querna, Klaus Post
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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import (
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"encoding/json"
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"errors"
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fflib "github.com/pquerna/ffjson/fflib/v1"
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"io"
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"io/ioutil"
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"reflect"
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)
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// This is a reusable decoder.
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// This should not be used by more than one goroutine at the time.
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type Decoder struct {
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fs *fflib.FFLexer
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}
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// NewDecoder returns a reusable Decoder.
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func NewDecoder() *Decoder {
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return &Decoder{}
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}
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// Decode the data in the supplied data slice.
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func (d *Decoder) Decode(data []byte, v interface{}) error {
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f, ok := v.(unmarshalFaster)
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if ok {
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if d.fs == nil {
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d.fs = fflib.NewFFLexer(data)
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} else {
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d.fs.Reset(data)
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}
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return f.UnmarshalJSONFFLexer(d.fs, fflib.FFParse_map_start)
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}
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um, ok := v.(json.Unmarshaler)
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if ok {
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return um.UnmarshalJSON(data)
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}
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return json.Unmarshal(data, v)
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}
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// Decode the data from the supplied reader.
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// You should expect that data is read into memory before it is decoded.
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func (d *Decoder) DecodeReader(r io.Reader, v interface{}) error {
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_, ok := v.(unmarshalFaster)
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_, ok2 := v.(json.Unmarshaler)
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if ok || ok2 {
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data, err := ioutil.ReadAll(r)
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if err != nil {
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return err
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}
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defer fflib.Pool(data)
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return d.Decode(data, v)
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}
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dec := json.NewDecoder(r)
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return dec.Decode(v)
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}
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// DecodeFast will unmarshal the data if fast unmarshal is available.
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// This function can be used if you want to be sure the fast
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// unmarshal is used or in testing.
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// If you would like to have fallback to encoding/json you can use the
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// regular Decode() method.
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func (d *Decoder) DecodeFast(data []byte, v interface{}) error {
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f, ok := v.(unmarshalFaster)
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if !ok {
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return errors.New("ffjson unmarshal not available for type " + reflect.TypeOf(v).String())
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}
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if d.fs == nil {
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d.fs = fflib.NewFFLexer(data)
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} else {
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d.fs.Reset(data)
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}
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return f.UnmarshalJSONFFLexer(d.fs, fflib.FFParse_map_start)
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}
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