forked from scionproto/scion
/
action_map.go
88 lines (77 loc) · 2.17 KB
/
action_map.go
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// Copyright 2017 ETH Zurich
//
// 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 pktcls
import (
"encoding/json"
"github.com/scionproto/scion/go/lib/common"
)
// ActionMap is a container for Actions, keyed by their unique name. Attempting
// to add an Action with the same name twice returns an error. ActionMap can be
// used to marshal Actions to JSON. Unmarshaling back to ActionMap is
// guaranteed to yield an object that is identical to the initial one.
type ActionMap map[string]Action
func NewActionMap() ActionMap {
return make(ActionMap)
}
func (am ActionMap) Add(c Action) error {
_, ok := am[c.GetName()]
if ok {
return common.NewBasicError("Action name exists", nil, "name", c.GetName())
}
am[c.GetName()] = c
return nil
}
func (am ActionMap) Get(name string) (Action, error) {
class, ok := am[name]
if !ok {
return nil, common.NewBasicError("Action not found", nil, "name", name)
}
return class, nil
}
func (am ActionMap) Remove(name string) error {
_, ok := am[name]
if !ok {
return common.NewBasicError("Action not found", nil, "name", name)
}
delete(am, name)
return nil
}
func (am ActionMap) MarshalJSON() ([]byte, error) {
m := make(map[string]*json.RawMessage)
for k, v := range am {
b, err := marshalInterface(v)
if err != nil {
return nil, err
}
m[k] = (*json.RawMessage)(&b)
}
return json.Marshal(m)
}
func (am *ActionMap) UnmarshalJSON(b []byte) error {
m := make(map[string]*json.RawMessage)
err := json.Unmarshal(b, &m)
if err != nil {
return err
}
*am = make(map[string]Action)
for k, v := range m {
action, err := unmarshalAction(*v)
if err != nil {
return err
}
action.setName(k)
(*am)[k] = action
}
return nil
}