Add hidden utils and constants to NetworkStack

Test: atest FrameworksNetTests NetworkStackTests
Bug: 112869080
Change-Id: I1a803f7954ab760294436226d6c1cffb934e98f9

1 files changed, 30 insertions, 0 deletions

diff --git a/src/android/net/util/NetworkStackUtils.java b/src/android/net/util/NetworkStackUtils.java
new file mode 100644
index 0000000..6dcf0c0
--- /dev/null
+++ b/src/android/net/util/NetworkStackUtils.java
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * 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 android.net.util;
+
+/**
+ * Collection of utilities for the network stack.
+ */
+public class NetworkStackUtils {
+
+    /**
+     * @return True if the array is null or 0-length.
+     */
+    public static <T> boolean isEmpty(T[] array) {
+        return array == null || array.length == 0;
+    }
+}