vendor files

vendor/k8s.io/kubernetes/pkg/util/slice/slice.go

@@ -0,0 +1,70 @@
+/*
+Copyright 2015 The Kubernetes 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 slice provides utility methods for common operations on slices.
+package slice
+
+import (
+	"sort"
+
+	utilrand "k8s.io/apimachinery/pkg/util/rand"
+)
+
+// CopyStrings copies the contents of the specified string slice
+// into a new slice.
+func CopyStrings(s []string) []string {
+	if s == nil {
+		return nil
+	}
+	c := make([]string, len(s))
+	copy(c, s)
+	return c
+}
+
+// SortStrings sorts the specified string slice in place. It returns the same
+// slice that was provided in order to facilitate method chaining.
+func SortStrings(s []string) []string {
+	sort.Strings(s)
+	return s
+}
+
+// ShuffleStrings copies strings from the specified slice into a copy in random
+// order. It returns a new slice.
+func ShuffleStrings(s []string) []string {
+	if s == nil {
+		return nil
+	}
+	shuffled := make([]string, len(s))
+	perm := utilrand.Perm(len(s))
+	for i, j := range perm {
+		shuffled[j] = s[i]
+	}
+	return shuffled
+}
+
+// ContainsString checks if a given slice of strings contains the provided string.
+// If a modifier func is provided, it is called with the slice item before the comparation.
+func ContainsString(slice []string, s string, modifier func(s string) string) bool {
+	for _, item := range slice {
+		if item == s {
+			return true
+		}
+		if modifier != nil && modifier(item) == s {
+			return true
+		}
+	}
+	return false
+}