Added HasAll utility method for string set.

Added HasAll method which detects if one set contains all
of the memebers of another set.

A.HasAll(B) returns true if A is a superset of B.

pkg/api/validation_test.go

@@ -34,7 +34,8 @@ func TestValidateVolumes(t *testing.T) {
 	if len(errs) != 0 {
 		t.Errorf("expected success: %v", errs)
 	}
-	if len(names) != 4 || !names.Has("abc") || !names.Has("123") || !names.Has("abc-123") || !names.Has("empty") {
+	expectedSet := util.NewStringSet("abc", "123", "abc-123", "empty")
+	if len(names) != 4 || !names.HasAll(expectedSet) {
 		t.Errorf("wrong names result: %v", names)
 	}
 

pkg/util/set.go

@@ -50,6 +50,16 @@ func (s StringSet) Has(item string) bool {
 	return contained
 }
 
+// HasAll returns true iff all items are contained in the set.
+func (s1 StringSet) HasAll(s2 StringSet) bool {
+	for item, _ := range s2 {
+		if !s1.Has(item) {
+			return false
+		}
+	}
+	return true
+}
+
 // List returns the contents as a sorted string slice.
 func (s StringSet) List() []string {
 	res := make([]string, 0, len(s))

pkg/util/set_test.go

@@ -23,6 +23,7 @@ import (
 
 func TestStringSet(t *testing.T) {
 	s := StringSet{}
+	s2 := StringSet{}
 	if len(s) != 0 {
 		t.Errorf("Expected len=0: %d", len(s))
 	}
@@ -41,6 +42,15 @@ func TestStringSet(t *testing.T) {
 	if s.Has("a") {
 		t.Errorf("Unexpected contents: %#v", s)
 	}
+	s.Insert("a")
+	s2.Insert("a","b","d")
+	if s.HasAll(s2) {
+		t.Errorf("Unexpected contents: %#v", s)
+	}
+	s2.Delete("d")
+	if !s.HasAll(s2) {
+		t.Errorf("Missing contents: %#v", s)
+	}
 }
 
 func TestNewStringSet(t *testing.T) {