91 lines
2.4 KiB
Go
91 lines
2.4 KiB
Go
/*
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Copyright 2022 The Karmada Authors.
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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 genericresource
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import (
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utilerrors "k8s.io/apimachinery/pkg/util/errors"
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)
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// Result contains helper methods for dealing with the outcome of a Builder.
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type Result struct {
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err error
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visitor Visitor
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// populated by a call to Infos
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info []*Info
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ignoreErrors []utilerrors.Matcher
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}
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// Err returns one or more errors (via a util.ErrorList) that occurred prior
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// to visiting the elements in the visitor. To see all errors including those
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// that occur during visitation, invoke Infos().
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func (r *Result) Err() error {
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return r.err
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}
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// Objects returns the list of objects of all found resources.
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func (r *Result) Objects() ([]interface{}, error) {
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infos, err := r.Infos()
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if err != nil {
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return nil, err
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}
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objects := make([]interface{}, len(infos))
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for i, info := range infos {
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objects[i] = info.Object
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}
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return objects, err
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}
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// Infos returns an array of all of the resource infos retrieved via traversal.
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// Will attempt to traverse the entire set of visitors only once, and will return
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// a cached list on subsequent calls.
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func (r *Result) Infos() ([]*Info, error) {
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if r.err != nil {
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return nil, r.err
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}
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if r.info != nil {
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return r.info, nil
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}
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var infos []*Info
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err := r.visitor.Visit(func(info *Info, err error) error {
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if err != nil {
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return err
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}
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infos = append(infos, info)
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return nil
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})
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err = utilerrors.FilterOut(err, r.ignoreErrors...)
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r.info, r.err = infos, err
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return infos, err
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}
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// Visit implements the Visitor interface on the items described in the Builder.
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// Note that some visitor sources are not traversable more than once, or may
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// return different results. If you wish to operate on the same set of resources
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// multiple times, use the Infos() method.
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func (r *Result) Visit(fn VisitorFunc) error {
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if r.err != nil {
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return r.err
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}
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err := r.visitor.Visit(fn)
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return utilerrors.FilterOut(err, r.ignoreErrors...)
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}
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