Added mutating methods for our forked version of DefaultRESTMapper

On-behalf-of: SAP [email protected]
Signed-off-by: Robert Vasek <[email protected]>

Author: gman0

pkg/dynamicrestmapper/defaultrestmapper_mutable.go

@@ -0,0 +1,68 @@
+/*
+Copyright 2025 The KCP 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 dynamicrestmapper
+
+import (
+	"slices"
+)
+
+// This file adds mutable methods to our fork of upstream's DefaultRESTMapper.
+
+func (m *DefaultRESTMapper) empty() bool {
+	// If one of the maps is empty, all of the maps are empty.
+	return len(m.resourceToKind) == 0
+}
+
+func (m *DefaultRESTMapper) add(typeMeta gvkr) {
+	kind := typeMeta.groupVersionKind()
+	singular := typeMeta.groupVersionResourceSingular()
+	plural := typeMeta.groupVersionResourcePlural()
+
+	m.singularToPlural[singular] = plural
+	m.pluralToSingular[plural] = singular
+
+	m.resourceToKind[singular] = kind
+	m.resourceToKind[plural] = kind
+
+	m.kindToPluralResource[kind] = plural
+}
+
+func (m *DefaultRESTMapper) remove(typeMeta gvkr) {
+	kind := typeMeta.groupVersionKind()
+	singular := m.kindToPluralResource[kind]
+	plural := m.singularToPlural[typeMeta.groupVersionResourceSingular()]
+
+	delete(m.kindToPluralResource, kind)
+	delete(m.kindToScope, kind)
+	delete(m.singularToPlural, singular)
+	delete(m.pluralToSingular, plural)
+	delete(m.resourceToKind, plural)
+}
+
+func (m *DefaultRESTMapper) apply(toRemove []gvkr, toAdd []gvkr) {
+	if slices.Equal(toRemove, toAdd) {
+		return
+	}
+
+	for i := range toRemove {
+		m.remove(toRemove[i])
+	}
+
+	for i := range toAdd {
+		m.add(toAdd[i])
+	}
+}