type RESTMapper errors to better handle MultiRESTMapper errors

pkg/api/meta/errors.go

@@ -0,0 +1,72 @@
+/*
+Copyright 2014 The Kubernetes Authors All rights reserved.
+
+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 meta
+
+import (
+	"fmt"
+
+	"k8s.io/kubernetes/pkg/api/unversioned"
+)
+
+// AmbiguousResourceError is returned if the RESTMapper finds multiple matches for a resource
+type AmbiguousResourceError struct {
+	PartialResource unversioned.GroupVersionResource
+
+	MatchingResources []unversioned.GroupVersionResource
+	MatchingKinds     []unversioned.GroupVersionKind
+}
+
+func (e *AmbiguousResourceError) Error() string {
+	switch {
+	case len(e.MatchingKinds) > 0 && len(e.MatchingResources) > 0:
+		return fmt.Sprintf("%v matches multiple resources %v and kinds %v", e.PartialResource, e.MatchingResources, e.MatchingKinds)
+	case len(e.MatchingKinds) > 0:
+		return fmt.Sprintf("%v matches multiple kinds %v", e.PartialResource, e.MatchingKinds)
+	case len(e.MatchingResources) > 0:
+		return fmt.Sprintf("%v matches multiple resources %v", e.PartialResource, e.MatchingResources)
+
+	}
+
+	return fmt.Sprintf("%v matches multiple resources or kinds", e.PartialResource)
+}
+
+func IsAmbiguousResourceError(err error) bool {
+	if err == nil {
+		return false
+	}
+
+	_, ok := err.(*AmbiguousResourceError)
+	return ok
+}
+
+// NoResourceMatchError is returned if the RESTMapper can't find any match for a resource
+type NoResourceMatchError struct {
+	PartialResource unversioned.GroupVersionResource
+}
+
+func (e *NoResourceMatchError) Error() string {
+	return fmt.Sprintf("no matches for %v", e.PartialResource)
+}
+
+func IsNoResourceMatchError(err error) bool {
+	if err == nil {
+		return false
+	}
+
+	_, ok := err.(*NoResourceMatchError)
+	return ok
+}