48 lines
1.2 KiB
Go
48 lines
1.2 KiB
Go
|
// Copyright 2014 Google Inc. All Rights Reserved.
|
||
|
|
//
|
||
|
|
// 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.
|
||
|
|
|
||
|
|
// This file provides error functions for common API failure modes.
|
||
|
|
|
||
|
|
package datastore
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
)
|
||
|
|
|
||
|
|
// MultiError is returned by batch operations when there are errors with
|
||
|
|
// particular elements. Errors will be in a one-to-one correspondence with
|
||
|
|
// the input elements; successful elements will have a nil entry.
|
||
|
|
type MultiError []error
|
||
|
|
|
||
|
|
func (m MultiError) Error() string {
|
||
|
|
s, n := "", 0
|
||
|
|
for _, e := range m {
|
||
|
|
if e != nil {
|
||
|
|
if n == 0 {
|
||
|
|
s = e.Error()
|
||
|
|
}
|
||
|
|
n++
|
||
|
|
}
|
||
|
|
}
|
||
|
|
switch n {
|
||
|
|
case 0:
|
||
|
|
return "(0 errors)"
|
||
|
|
case 1:
|
||
|
|
return s
|
||
|
|
case 2:
|
||
|
|
return s + " (and 1 other error)"
|
||
|
|
}
|
||
|
|
return fmt.Sprintf("%s (and %d other errors)", s, n-1)
|
||
|
|
}
|