/
stringmap.go
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/
stringmap.go
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// Copyright 2018 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
import (
"fmt"
"reflect"
mixerpb "istio.io/api/mixer/v1"
)
// StringMap wraps a map[string]string and optionally reference counts it
type StringMap struct {
// name of the stringmap -- request.headers
name string
// entries in the stringmap
entries map[string]string
// protoBag that owns this stringmap
pb *ProtoBag
}
// NewStringMap instantiates a new string map.
func NewStringMap(name string) StringMap {
return StringMap{
name: name,
entries: make(map[string]string, 1),
}
}
// WrapStringMap wraps a string map value without reference tracking.
func WrapStringMap(entries map[string]string) StringMap {
return StringMap{entries: entries}
}
// Set wraps a string map set operation.
func (s StringMap) Set(key, val string) {
s.entries[key] = val
}
// Get returns a stringmap value and records access
func (s StringMap) Get(key string) (string, bool) {
str, found := s.entries[key]
// the string map may be detached from the owning bag
if s.pb != nil {
cond := mixerpb.ABSENCE
if found {
cond = mixerpb.EXACT
}
// TODO add REGEX condition
s.pb.trackMapReference(s.name, key, cond)
}
return str, found
}
// Entries returns the wrapped string map.
func (s StringMap) Entries() map[string]string {
return s.entries
}
func (s StringMap) copyValue() StringMap {
c := make(map[string]string, len(s.entries))
for k2, v2 := range s.entries {
c[k2] = v2
}
return StringMap{name: s.name, entries: c, pb: s.pb}
}
// String returns a string representation of the entries in the string map
func (s StringMap) String() string {
return fmt.Sprintf("string%v", s.entries)
}
// Equal compares the string map entries
func (s StringMap) Equal(t StringMap) bool {
return reflect.DeepEqual(s.entries, t.entries)
}