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/*
* Copyright (C) 2017 ~ 2018 Deepin Technology Co., Ltd.
*
* Author: jouyouyun <jouyouwen717@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package initializer
// Initializer is a chainable initializer. Init/InitOnSystemBus/InitOnSystemBus will accept a initializer,
// and then pass the successful return value to the next initializer. If error occurs, the rest initializers
// won't be executed any more. GetError is used to access the error.
type Initializer struct {
e error
}
func (i *Initializer) init(fn func() error) *Initializer {
if i.e != nil {
return i
}
if err := fn(); err != nil {
i.e = err
}
return i
}
// Do accepts a initializer function, stop other Do if any error occurs.
func (i *Initializer) Do(fn func() error) *Initializer {
return i.init(func() error {
err := fn()
if err != nil {
return err
}
return nil
})
}
// GetError returns the first error of initializers.
func (i *Initializer) GetError() error {
if i.e != nil {
return i.e
}
return nil
}
// Do starts the initialization.
func Do(fn func() error) *Initializer {
i := new(Initializer)
return i.Do(fn)
}
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