1 files changed, 49 insertions, 0 deletions
diff --git a/src/com/android/networkstack/apishim/SocketUtilsShim.java b/src/com/android/networkstack/apishim/SocketUtilsShim.java
new file mode 100644
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--- /dev/null
+++ b/src/com/android/networkstack/apishim/SocketUtilsShim.java
@@ -0,0 +1,49 @@
+/*
+ * 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 com.android.networkstack.apishim;
+
+import androidx.annotation.NonNull;
+
+import java.net.SocketAddress;
+
+/**
+ * Interface used to access API methods in {@link android.net.util.SocketUtils}, with appropriate
+ * fallbacks if the methods are not yet part of the released API.
+ *
+ * <p>This interface makes it easier for callers to use SocketUtilsShimImpl, as it's more obvious
+ * what methods must be implemented on each API level, and it abstracts from callers the need to
+ * reference classes that have different implementations (which also does not work well with IDEs).
+ */
+public interface SocketUtilsShim {
+    /**
+     * Create a new instance of SocketUtilsShim.
+     */
+    @NonNull
+    static SocketUtilsShim newInstance() {
+        // TODO: when the R API is finalized, rename the API 29 shim to SocketUtilsCompat, and
+        // return it here instead of SocketUtilsShimImpl for devices with Build.VERSION <= 29.
+        // For now, the switch between implementations is done at build time (swapping the java file
+        // with another), since production modules should not be built with a non-finalized API.
+        return new SocketUtilsShimImpl();
+    }
+
+    /**
+     * @see android.net.util.SocketUtils#makePacketSocketAddress(int, int, byte[])
+     */
+    @NonNull
+    SocketAddress makePacketSocketAddress(int protocol, int ifIndex, @NonNull byte[] hwAddr);
+}