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// Copyright 2020 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package meta
import (
"fmt"
"reflect"
)
var (
// ErrValidate is an empty ValidateErr object, useful for type checking
ErrValidate = &ValidateErr{}
)
// error types
const (
TypeConflict = "conflict"
TypeMismatch = "mismatch"
)
// ValidateErr is the error when meta validation fails with conflicts
type ValidateErr struct {
Type string // conflict type
Target string // conflict Target
Value any // conflict Value
LHS string // object 1
RHS string // object 2
}
// Error implements the error interface
func (e *ValidateErr) Error() string {
return fmt.Sprintf("%s %s for '%v' between '%s' and '%s'", e.Target, e.Type, e.Value, e.LHS, e.RHS)
}
// Unwrap implements the error interface
func (e *ValidateErr) Unwrap() error { return nil }
// Is implements the error interface
func (e *ValidateErr) Is(target error) bool {
t, ok := target.(*ValidateErr)
if !ok {
return false
}
// check for interface Value separately
if e.Value != nil && t.Value != nil &&
(!reflect.ValueOf(e.Value).IsValid() && !reflect.ValueOf(t.Value).IsValid()) {
return false
}
// not supporting non-comparable values for now
if e.Value != nil && t.Value != nil &&
!(reflect.TypeOf(e.Value).Comparable() && reflect.TypeOf(t.Value).Comparable()) {
return false
}
return (e.Type == t.Type || t.Type == "") &&
(e.Target == t.Target || t.Target == "") &&
(e.Value == t.Value || t.Value == nil || reflect.ValueOf(t.Value).IsZero()) &&
(e.LHS == t.LHS || t.LHS == "") &&
(e.RHS == t.RHS || t.RHS == "")
}
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