package atom

import (
	"errors"
	"fmt"
)

type ID struct {
	*CommonAttributes
	URI IRI `xml:"uri"`
}

// NewID creates a new ID. It returns a *ID.
func NewID(id string) *ID {
	return &ID{URI: IRI(id)}
}

// Check checks the ID for incompatibilities with RFC4287. It returns an error.
func (i *ID) Check() error {
	if i.URI == "" {
		return errors.New("uri element of id empty")
	} else {
		if !isValidIRI(i.URI) {
			return fmt.Errorf("uri element %v of id not correctly formatted", i.URI)
		}
	}

	return nil
}