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emptyBag.go
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/
emptyBag.go
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// Copyright 2017 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package attribute
// emptyBag is an attribute bag that is always empty. It is primarily used as a backstop in a
// chain of bags
type emptyBag struct{}
var empty = &emptyBag{}
var emptySlice = []string{}
func (eb *emptyBag) Get(name string) (interface{}, bool) { return nil, false }
func (eb *emptyBag) Names() []string { return emptySlice }
func (eb *emptyBag) Contains(key string) bool { return false }
func (eb *emptyBag) Done() {}
func (eb *emptyBag) String() string { return "" }