/
validation.go
39 lines (36 loc) · 1.39 KB
/
validation.go
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// Copyright (c) 2022 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 validation
// ShouldEnforceImmutability compares the given slices and returns if a immutability should be enforced.
// It mainly checks if the order of the same elements in `new` and `old` is the same, i.e. only an addition
// of elements to `new` is allowed.
func ShouldEnforceImmutability(new, old []string) bool {
sizeDelta := len(new) - len(old)
if sizeDelta > 0 {
newA := new[:len(new)-sizeDelta]
if equal(newA, old) {
return false
}
return ShouldEnforceImmutability(newA, old)
}
return sizeDelta < 0 || sizeDelta == 0
}
func equal(new, old []string) bool {
for i := range new {
if new[i] != old[i] {
return false
}
}
return true
}