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resolver.go
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/
resolver.go
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package findingaid
import (
"context"
"github.com/aaronland/go-roster"
"net/url"
)
type Resolver interface {
ResolveURI(context.Context, string) (interface{}, error)
}
type ResolverInitializationFunc func(ctx context.Context, uri string) (Resolver, error)
var resolvers roster.Roster
func ensureResolvers() error {
if resolvers == nil {
r, err := roster.NewDefaultRoster()
if err != nil {
return err
}
resolvers = r
}
return nil
}
func RegisterResolver(ctx context.Context, name string, c ResolverInitializationFunc) error {
err := ensureResolvers()
if err != nil {
return err
}
return resolvers.Register(ctx, name, c)
}
func NewResolver(ctx context.Context, uri string) (Resolver, error) {
u, err := url.Parse(uri)
if err != nil {
return nil, err
}
scheme := u.Scheme
i, err := resolvers.Driver(ctx, scheme)
if err != nil {
return nil, err
}
init := i.(ResolverInitializationFunc)
c, err := init(ctx, uri)
if err != nil {
return nil, err
}
return c, nil
}