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64 lines
1.8 KiB
Go
64 lines
1.8 KiB
Go
// Copyright 2014 The Prometheus 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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//
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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 metric
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import "github.com/prometheus/common/model"
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// Metric wraps a model.Metric and copies it upon modification if Copied is false.
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type Metric struct {
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Copied bool
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Metric model.Metric
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}
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// Set sets a label name in the wrapped Metric to a given value and copies the
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// Metric initially, if it is not already a copy.
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func (m *Metric) Set(ln model.LabelName, lv model.LabelValue) {
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m.Copy()
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m.Metric[ln] = lv
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}
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// Del deletes a given label name from the wrapped Metric and copies the
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// Metric initially, if it is not already a copy.
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func (m *Metric) Del(ln model.LabelName) {
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m.Copy()
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delete(m.Metric, ln)
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}
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// Get the value for the given label name. An empty value is returned
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// if the label does not exist in the metric.
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func (m *Metric) Get(ln model.LabelName) model.LabelValue {
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return m.Metric[ln]
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}
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// Gets behaves as Get but the returned boolean is false iff the label
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// does not exist.
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func (m *Metric) Gets(ln model.LabelName) (model.LabelValue, bool) {
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lv, ok := m.Metric[ln]
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return lv, ok
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}
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// Copy the underlying Metric if it is not already a copy.
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func (m *Metric) Copy() *Metric {
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if !m.Copied {
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m.Metric = m.Metric.Clone()
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m.Copied = true
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}
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return m
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}
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// String implements fmt.Stringer.
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func (m Metric) String() string {
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return m.Metric.String()
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}
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