55 lines
1.5 KiB
Go
55 lines
1.5 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package util
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import (
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"fmt"
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)
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// []error is a collection of errors. This does not implement the error
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// interface to avoid confusion where an empty []error would still be an
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// error (non-nil). To produce a single error instance from an []error, use
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// the SliceToError() method, which will return nil for an empty []error.
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// This helper implements the error interface for []error, but prevents
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// accidental conversion of []error to error.
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type errorList []error
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// Error is part of the error interface.
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func (list errorList) Error() string {
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if len(list) == 0 {
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return ""
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}
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if len(list) == 1 {
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return list[0].Error()
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}
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result := fmt.Sprintf("[%s", list[0].Error())
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for i := 1; i < len(list); i++ {
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result += fmt.Sprintf(", %s", list[i].Error())
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}
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result += "]"
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return result
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}
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// SliceToError converts an []error into a "normal" error, or nil if the slice is empty.
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func SliceToError(errs []error) error {
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if len(errs) == 0 {
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return nil
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}
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return errorList(errs)
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}
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