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errors.go
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/
errors.go
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// Copyright 2020 The ZKits Project Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package runner
import (
"strings"
)
// Errors defines a collection of errors, which is usually used to represent
// errors of the same type within a cycle within an application.
type Errors struct {
errs []error
}
// Error method is an implementation of the error interface.
func (e *Errors) Error() string {
switch l := len(e.errs); l {
case 0:
return "<empty errors>"
case 1:
return e.errs[0].Error()
default:
s := make([]string, 0, l)
for i := 0; i < l; i++ {
s = append(s, e.errs[i].Error())
}
return strings.Join(s, "; ")
}
}
// Add method adds an error to the current error list.
// If the given error is nil, it is automatically ignored.
func (e *Errors) Add(err error) {
if err == nil {
return
}
if v, ok := err.(*Errors); ok {
if len(v.errs) > 0 {
e.errs = append(e.errs, v.errs...)
}
} else {
e.errs = append(e.errs, err)
}
}
// First method returns the first error in the current error list
// or nil if the list is empty.
func (e *Errors) First() error {
if len(e.errs) == 0 {
return nil
}
return e.errs[0]
}
// Last method returns the last error in the current error list
// or nil if the list is empty.
func (e *Errors) Last() error {
if len(e.errs) == 0 {
return nil
}
return e.errs[len(e.errs)-1]
}
// Len method returns the length of the current error list.
func (e *Errors) Len() int {
return len(e.errs)
}
// All method returns all errors in the current error list.
func (e *Errors) All() []error {
return e.errs
}