60 lines
1.2 KiB
Go
60 lines
1.2 KiB
Go
// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.
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package resource
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import (
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"errors"
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"fmt"
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"net/url"
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"strings"
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)
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var (
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ErrUnknownResourceType = errors.New("Unknown resource type")
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ResourceTypes *Types = NewTypes()
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)
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type TypeName string //`json:"type"`
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type TypeFactory func(*url.URL) Resource
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type Types struct {
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registry map[string]TypeFactory
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}
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func NewTypes() *Types {
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return &Types{registry: make(map[string]TypeFactory)}
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}
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func (t *Types) Register(name string, factory TypeFactory) {
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t.registry[name] = factory
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}
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func (t *Types) New(uri string) (Resource, error) {
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u, e := url.Parse(uri)
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if u == nil || e != nil {
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return nil, fmt.Errorf("%w: %s", ErrUnknownResourceType, e)
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}
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if r, ok := t.registry[u.Scheme]; ok {
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return r(u), nil
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}
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return nil, fmt.Errorf("%w: %s", ErrUnknownResourceType, u.Scheme)
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}
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func (t *Types) Has(typename string) bool {
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if _, ok := t.registry[typename]; ok {
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return true
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}
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return false
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}
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func (n *TypeName) UnmarshalJSON(b []byte) error {
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ResourceTypeName := strings.Trim(string(b), "\"")
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if ResourceTypes.Has(ResourceTypeName) {
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*n = TypeName(ResourceTypeName)
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return nil
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}
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return fmt.Errorf("%w: %s", ErrUnknownResourceType, ResourceTypeName)
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}
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