mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2025-01-22 03:38:42 +02:00
0bb12d9b1b
* New label set API * Checkpoint * Remove label.Labels interface * Fix trace * Remove label storage * Restore metric_test.go * Tidy tests * More comments * More comments * Same changes as 654 * Checkpoint * Fix batch labels * Avoid Resource.Attributes() where possible * Update comments and restore order in resource.go * From feedback * From feedback * Move iterator_test & feedback * Strenghten the label.Set test * Feedback on typos * Fix the set test per @krnowak * Nit
78 lines
2.0 KiB
Go
78 lines
2.0 KiB
Go
// Copyright The OpenTelemetry Authors
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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 label
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import (
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"go.opentelemetry.io/otel/api/core"
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)
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// Iterator allows iterating over the set of labels in order,
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// sorted by key.
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type Iterator struct {
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storage *Set
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idx int
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}
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// Next moves the iterator to the next position. Returns false if there
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// are no more labels.
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func (i *Iterator) Next() bool {
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i.idx++
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return i.idx < i.Len()
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}
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// Label returns current core.KeyValue. Must be called only after Next returns
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// true.
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func (i *Iterator) Label() core.KeyValue {
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kv, _ := i.storage.Get(i.idx)
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return kv
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}
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// Attribute is a synonym for Label().
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func (i *Iterator) Attribute() core.KeyValue {
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return i.Label()
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}
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// IndexedLabel returns current index and label. Must be called only
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// after Next returns true.
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func (i *Iterator) IndexedLabel() (int, core.KeyValue) {
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return i.idx, i.Label()
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}
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// IndexedAttribute is a synonym for IndexedLabel().
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func (i *Iterator) IndexedAttribute() (int, core.KeyValue) {
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return i.IndexedLabel()
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}
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// Len returns a number of labels in the iterator's `*Set`.
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func (i *Iterator) Len() int {
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return i.storage.Len()
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}
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// ToSlice is a convenience function that creates a slice of labels
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// from the passed iterator. The iterator is set up to start from the
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// beginning before creating the slice.
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func (i *Iterator) ToSlice() []core.KeyValue {
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l := i.Len()
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if l == 0 {
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return nil
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}
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i.idx = -1
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slice := make([]core.KeyValue, 0, l)
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for i.Next() {
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slice = append(slice, i.Label())
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}
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return slice
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}
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