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cursor.go
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cursor.go
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package database
import (
"github.com/sedracoin/sedrad/domain/consensus/model"
"github.com/sedracoin/sedrad/infrastructure/db/database"
"github.com/pkg/errors"
)
type dbCursor struct {
cursor database.Cursor
isClosed bool
}
func (d dbCursor) Next() bool {
if d.isClosed {
panic("Tried using a closed DBCursor")
}
return d.cursor.Next()
}
func (d dbCursor) First() bool {
if d.isClosed {
panic("Tried using a closed DBCursor")
}
return d.cursor.First()
}
func (d dbCursor) Seek(key model.DBKey) error {
if d.isClosed {
return errors.New("Tried using a closed DBCursor")
}
return d.cursor.Seek(dbKeyToDatabaseKey(key))
}
func (d dbCursor) Key() (model.DBKey, error) {
if d.isClosed {
return nil, errors.New("Tried using a closed DBCursor")
}
key, err := d.cursor.Key()
if err != nil {
return nil, err
}
return newDBKey(key), nil
}
func (d dbCursor) Value() ([]byte, error) {
if d.isClosed {
return nil, errors.New("Tried using a closed DBCursor")
}
return d.cursor.Value()
}
func (d dbCursor) Close() error {
if d.isClosed {
return errors.New("Tried using a closed DBCursor")
}
d.isClosed = true
err := d.cursor.Close()
if err != nil {
return err
}
d.cursor = nil
return nil
}
func newDBCursor(cursor database.Cursor) model.DBCursor {
return &dbCursor{cursor: cursor}
}