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