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47 lines
1.2 KiB
Go
47 lines
1.2 KiB
Go
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// This file provides error functions for common API failure modes.
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package datastore
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import (
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"fmt"
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)
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// MultiError is returned by batch operations when there are errors with
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// particular elements. Errors will be in a one-to-one correspondence with
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// the input elements; successful elements will have a nil entry.
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type MultiError []error
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func (m MultiError) Error() string {
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s, n := "", 0
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for _, e := range m {
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if e != nil {
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if n == 0 {
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s = e.Error()
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}
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n++
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}
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}
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switch n {
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case 0:
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return "(0 errors)"
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case 1:
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return s
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case 2:
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return s + " (and 1 other error)"
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}
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return fmt.Sprintf("%s (and %d other errors)", s, n-1)
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}
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