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parco_builder_multi.go
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parco_builder_multi.go
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package parco
import (
"fmt"
"github.com/pkg/errors"
"io"
"sync/atomic"
)
type (
serializable[T comparable] interface {
ParcoID() T
}
parserAny interface {
ParseAny(io.Reader) (any, error)
}
compilerAny interface {
CompileAny(any, io.Writer) error
}
builderAny interface {
parserAny
compilerAny
}
ModelMultiBuilder[T comparable] struct {
header Type[T]
parsers map[T]parserAny
compilers map[T]compilerAny
}
)
func MultiBuilder[T comparable](header Type[T]) *ModelMultiBuilder[T] {
return &ModelMultiBuilder[T]{
header: header,
parsers: make(map[T]parserAny),
compilers: make(map[T]compilerAny),
}
}
func (b *ModelMultiBuilder[T]) Register(id T, builder builderAny) (*ModelMultiBuilder[T], error) {
if _, ok := b.parsers[id]; !ok {
b.parsers[id] = builder
b.compilers[id] = builder
return b, nil
}
return b, errors.Wrapf(ErrAlreadyRegistered, "id: %v", id)
}
func (b *ModelMultiBuilder[T]) MustRegister(id T, builder builderAny) *ModelMultiBuilder[T] {
if _, ok := b.parsers[id]; !ok {
b.parsers[id] = builder
b.compilers[id] = builder
return b
}
panic(fmt.Sprintf("this id is registered already: %v", id))
}
func (b *ModelMultiBuilder[T]) Parse(r io.Reader) (id T, res any, err error) {
id, err = b.header.Parse(r)
if err != nil {
return
}
p, ok := b.parsers[id]
if !ok {
err = errors.Wrapf(ErrUnknownType, "%v", id)
return
}
res, err = p.ParseAny(r)
return
}
func (b *ModelMultiBuilder[T]) Compile(item serializable[T], w io.Writer) (err error) {
return b.compile(item.ParcoID(), item, w)
}
func (b *ModelMultiBuilder[T]) CompileAny(id T, item any, w io.Writer) (err error) {
return b.compile(id, item, w)
}
func (b *ModelMultiBuilder[T]) compile(id T, item any, w io.Writer) (err error) {
err = b.header.Compile(id, w)
if err != nil {
return
}
c, ok := b.compilers[id]
if !ok {
err = errors.Wrapf(ErrUnknownType, "%v", id)
return
}
err = c.CompileAny(item, w)
return
}
func newAtomicPtr[T comparable](builder *ModelMultiBuilder[T]) *atomic.Pointer[ModelMultiBuilder[T]] {
ptr := &atomic.Pointer[ModelMultiBuilder[T]]{}
ptr.Store(builder)
return ptr
}
var (
globalMultiBuilder = newAtomicPtr(MultiBuilder[int](UInt8Header()))
)
func RegisterModel(id int, builder builderAny) (err error) {
_, err = globalMultiBuilder.Load().Register(id, builder)
return
}
func CompileModel(item serializable[int], w io.Writer) (err error) {
err = globalMultiBuilder.Load().Compile(item, w)
return
}
func CompileAnyModel(id int, item any, w io.Writer) (err error) {
err = globalMultiBuilder.Load().CompileAny(id, item, w)
return
}
func ParseModel(r io.Reader) (int, any, error) {
return globalMultiBuilder.Load().Parse(r)
}