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unknown.go
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unknown.go
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// Copyright 2018 Google LLC
//
// 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 (
"github.com/google/cel-go/common/types/ref"
"reflect"
)
// Unknown type implementation which collects expression ids which caused the
// current value to become unknown.
type Unknown []int64
var (
// UnknownType singleton.
UnknownType = NewTypeValue("unknown")
)
func (u Unknown) ConvertToNative(typeDesc reflect.Type) (interface{}, error) {
return u.Value(), nil
}
func (u Unknown) ConvertToType(typeVal ref.Type) ref.Value {
return u
}
func (u Unknown) Equal(other ref.Value) ref.Value {
return u
}
func (u Unknown) Type() ref.Type {
return UnknownType
}
func (u Unknown) Value() interface{} {
return []int64(u)
}
// IsUnknown returns whether the element ref.Type or ref.Value is equal to the
// UnknownType singleton.
func IsUnknown(elem interface{}) bool {
switch elem.(type) {
case ref.Type:
return elem == UnknownType
case ref.Value:
return IsUnknown(elem.(ref.Value).Type())
}
return false
}