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isolator.go
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isolator.go
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// Copyright 2015 The appc 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 types
import (
"encoding/json"
)
var (
isolatorMap map[ACIdentifier]IsolatorValueConstructor
)
func init() {
isolatorMap = make(map[ACIdentifier]IsolatorValueConstructor)
}
type IsolatorValueConstructor func() IsolatorValue
func AddIsolatorValueConstructor(n ACIdentifier, i IsolatorValueConstructor) {
isolatorMap[n] = i
}
func AddIsolatorName(n ACIdentifier, ns map[ACIdentifier]struct{}) {
ns[n] = struct{}{}
}
type Isolators []Isolator
// GetByName returns the last isolator in the list by the given name.
func (is *Isolators) GetByName(name ACIdentifier) *Isolator {
var i Isolator
for j := len(*is) - 1; j >= 0; j-- {
i = []Isolator(*is)[j]
if i.Name == name {
return &i
}
}
return nil
}
// Unrecognized returns a set of isolators that are not recognized.
// An isolator is not recognized if it has not had an associated
// constructor registered with AddIsolatorValueConstructor.
func (is *Isolators) Unrecognized() Isolators {
u := Isolators{}
for _, i := range *is {
if i.value == nil {
u = append(u, i)
}
}
return u
}
type IsolatorValue interface {
UnmarshalJSON(b []byte) error
AssertValid() error
}
type Isolator struct {
Name ACIdentifier `json:"name"`
ValueRaw *json.RawMessage `json:"value"`
value IsolatorValue
}
type isolator Isolator
func (i *Isolator) Value() IsolatorValue {
return i.value
}
func (i *Isolator) UnmarshalJSON(b []byte) error {
var ii isolator
err := json.Unmarshal(b, &ii)
if err != nil {
return err
}
var dst IsolatorValue
con, ok := isolatorMap[ii.Name]
if ok {
dst = con()
err = dst.UnmarshalJSON(*ii.ValueRaw)
if err != nil {
return err
}
err = dst.AssertValid()
if err != nil {
return err
}
}
i.value = dst
i.ValueRaw = ii.ValueRaw
i.Name = ii.Name
return nil
}