Add Parcelable implementation for ApfCapabilities

This is necessary to allow usage of ApfCapabilities as-is in AIDL,
instead of relying on ApfCapabilitiesParcelable, assuming that stable
AIDL starts allowing usage of @SystemApi classes. The Parcelable
implementation would be convenient for clients in any case.

Bug: 126477266
Test: atest FrameworksNetTests
Change-Id: Id2ef3cad261832a2918ccb6bb6bc154d99d75746

core/java/android/net/apf/ApfCapabilities.java

@@ -19,17 +19,20 @@ package android.net.apf;
 import android.annotation.SystemApi;
 import android.annotation.TestApi;
 import android.content.Context;
+import android.os.Parcel;
+import android.os.Parcelable;
 
 import com.android.internal.R;
 
 /**
  * APF program support capabilities.
  *
+ * This class is immutable.
  * @hide
  */
 @SystemApi
 @TestApi
-public class ApfCapabilities {
+public final class ApfCapabilities implements Parcelable {
     /**
      * Version of APF instruction set supported for packet filtering. 0 indicates no support for
      * packet filtering using APF programs.
@@ -53,6 +56,37 @@ public class ApfCapabilities {
         this.apfPacketFormat = apfPacketFormat;
     }
 
+    private ApfCapabilities(Parcel in) {
+        apfVersionSupported = in.readInt();
+        maximumApfProgramSize = in.readInt();
+        apfPacketFormat = in.readInt();
+    }
+
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+        dest.writeInt(apfVersionSupported);
+        dest.writeInt(maximumApfProgramSize);
+        dest.writeInt(apfPacketFormat);
+    }
+
+    public static final Creator<ApfCapabilities> CREATOR = new Creator<ApfCapabilities>() {
+        @Override
+        public ApfCapabilities createFromParcel(Parcel in) {
+            return new ApfCapabilities(in);
+        }
+
+        @Override
+        public ApfCapabilities[] newArray(int size) {
+            return new ApfCapabilities[size];
+        }
+    };
+
     @Override
     public String toString() {
         return String.format("%s{version: %d, maxSize: %d, format: %d}", getClass().getSimpleName(),

tests/net/java/android/net/apf/ApfCapabilitiesTest.java

@@ -0,0 +1,50 @@
+/*
+ * 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.apf;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+
+import android.net.shared.ParcelableTestUtil;
+
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import com.android.internal.util.TestUtils;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class ApfCapabilitiesTest {
+    @Test
+    public void testParcelUnparcel() {
+        final ApfCapabilities caps = new ApfCapabilities(123, 456, 789);
+        ParcelableTestUtil.assertFieldCountEquals(3, ApfCapabilities.class);
+
+        TestUtils.assertParcelingIsLossless(caps, ApfCapabilities.CREATOR);
+    }
+
+    @Test
+    public void testEquals() {
+        assertEquals(new ApfCapabilities(1, 2, 3), new ApfCapabilities(1, 2, 3));
+        assertNotEquals(new ApfCapabilities(2, 2, 3), new ApfCapabilities(1, 2, 3));
+        assertNotEquals(new ApfCapabilities(1, 3, 3), new ApfCapabilities(1, 2, 3));
+        assertNotEquals(new ApfCapabilities(1, 2, 4), new ApfCapabilities(1, 2, 3));
+    }
+}