/
encoding.go
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/
encoding.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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.
package beam
import (
"encoding/json"
"reflect"
"github.com/apache/beam/sdks/go/pkg/beam/core/runtime/graphx"
"github.com/apache/beam/sdks/go/pkg/beam/core/util/reflectx"
)
// EncodeType encodes a type as a string. Unless registered, the decoded type
// is only guaranteed to the isomorphic to the input and with no methods.
func EncodeType(t reflect.Type) (string, error) {
return graphx.EncodeType(t)
}
// DecodeType decodes a type. Unless registered, the decoded type
// is only guaranteed to the isomorphic to the input and with no methods.
func DecodeType(data string) (reflect.Type, error) {
return graphx.DecodeType(data)
}
// EncodedType is a serialization wrapper around a type for convenience.
type EncodedType struct {
// T is the type to preserve across serialization.
T reflect.Type
}
// MarshalJSON returns the JSON encoding this value.
func (w EncodedType) MarshalJSON() ([]byte, error) {
str, err := EncodeType(w.T)
if err != nil {
return nil, err
}
return json.Marshal(str)
}
// UnmarshalJSON sets the state of this instance from the passed in JSON.
func (w *EncodedType) UnmarshalJSON(buf []byte) error {
var s string
if err := json.Unmarshal(buf, &s); err != nil {
return err
}
t, err := DecodeType(s)
if err != nil {
return err
}
w.T = t
return nil
}
// EncodeFunc encodes a function and parameter types as a string. The function
// symbol must be resolvable via the runtime.GlobalSymbolResolver. The types must
// be encodable.
func EncodeFunc(fn reflectx.Func) (string, error) {
return graphx.EncodeFn(fn)
}
// DecodeFunc encodes a function as a string. The function symbol must be
// resolvable via the runtime.GlobalSymbolResolver. The parameter types must
// be encodable.
func DecodeFunc(data string) (reflectx.Func, error) {
return graphx.DecodeFn(data)
}
// EncodedFunc is a serialization wrapper around a function for convenience.
type EncodedFunc struct {
// Fn is the function to preserve across serialization.
Fn reflectx.Func
}
// MarshalJSON returns the JSON encoding this value.
func (w EncodedFunc) MarshalJSON() ([]byte, error) {
str, err := EncodeFunc(w.Fn)
if err != nil {
return nil, err
}
return json.Marshal(str)
}
// UnmarshalJSON sets the state of this instance from the passed in JSON.
func (w *EncodedFunc) UnmarshalJSON(buf []byte) error {
var s string
if err := json.Unmarshal(buf, &s); err != nil {
return err
}
fn, err := DecodeFunc(s)
if err != nil {
return err
}
w.Fn = fn
return nil
}
// EncodeCoder encodes a coder as a string. Any custom coder function
// symbol must be resolvable via the runtime.GlobalSymbolResolver. The types must
// be encodable.
func EncodeCoder(c Coder) (string, error) {
return graphx.EncodeCoder(c.coder)
}
// DecodeCoder decodes a coder. Any custom coder function symbol must be
// resolvable via the runtime.GlobalSymbolResolver. The types must be encodable.
func DecodeCoder(data string) (Coder, error) {
c, err := graphx.DecodeCoder(data)
if err != nil {
return Coder{}, err
}
return Coder{coder: c}, nil
}
// EncodedCoder is a serialization wrapper around a coder for convenience.
type EncodedCoder struct {
// Coder is the coder to preserve across serialization.
Coder Coder
}
// MarshalJSON returns the JSON encoding this value.
func (w EncodedCoder) MarshalJSON() ([]byte, error) {
str, err := EncodeCoder(w.Coder)
if err != nil {
return nil, err
}
return json.Marshal(str)
}
// UnmarshalJSON sets the state of this instance from the passed in JSON.
func (w *EncodedCoder) UnmarshalJSON(buf []byte) error {
var s string
if err := json.Unmarshal(buf, &s); err != nil {
return err
}
c, err := DecodeCoder(s)
if err != nil {
return err
}
w.Coder = c
return nil
}