51 lines
1.4 KiB
Go
51 lines
1.4 KiB
Go
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// Copyright (C) 2014 Space Monkey, Inc.
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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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package utils
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import (
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"errors"
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"strings"
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)
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// ErrorGroup collates errors
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type ErrorGroup struct {
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Errors []error
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}
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// Add adds an error to an existing error group
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func (e *ErrorGroup) Add(err error) {
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if err != nil {
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e.Errors = append(e.Errors, err)
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}
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}
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// Finalize returns an error corresponding to the ErrorGroup state. If there's
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// no errors in the group, finalize returns nil. If there's only one error,
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// Finalize returns that error. Otherwise, Finalize will make a new error
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// consisting of the messages from the constituent errors.
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func (e *ErrorGroup) Finalize() error {
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if len(e.Errors) == 0 {
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return nil
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}
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if len(e.Errors) == 1 {
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return e.Errors[0]
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}
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msgs := make([]string, 0, len(e.Errors))
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for _, err := range e.Errors {
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msgs = append(msgs, err.Error())
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}
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return errors.New(strings.Join(msgs, "\n"))
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}
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