Pull out library needed for Notification CTS test. (a83de9e4) · Commits · e / os / android_frameworks_base

services/core/Android.bp

+4 −0

Original line number	Diff line number	Diff line
		@@ -154,6 +154,10 @@ java_library {
		static_libs: ["services.core.priorityboosted"],
		}

		java_library_host {
		name: "core_cts_test_resources",
		srcs: ["java/com/android/server/notification/SmallHash.java"]
		}

		prebuilt_etc {
		name: "gps_debug.conf",

services/core/java/com/android/server/notification/NotificationChannelLogger.java

+2 −2

Original line number	Diff line number	Diff line
		@@ -184,14 +184,14 @@ public interface NotificationChannelLogger {
		* @return Small hash of the channel ID, if present, or 0 otherwise.
		*/
		static int getIdHash(@NonNull NotificationChannel channel) {
		return NotificationRecordLogger.smallHash(channel.getId());
		return SmallHash.hash(channel.getId());
		}

		/**
		* @return Small hash of the channel ID, if present, or 0 otherwise.
		*/
		static int getIdHash(@NonNull NotificationChannelGroup group) {
		return NotificationRecordLogger.smallHash(group.getId());
		return SmallHash.hash(group.getId());
		}

		/**

services/core/java/com/android/server/notification/NotificationRecordLogger.java

+3 −22

Original line number	Diff line number	Diff line
		@@ -359,43 +359,24 @@ public interface NotificationRecordLogger {
		* @return Small hash of the notification ID, and tag (if present).
		*/
		int getNotificationIdHash() {
		return smallHash(Objects.hashCode(r.getSbn().getTag()) ^ r.getSbn().getId());
		return SmallHash.hash(Objects.hashCode(r.getSbn().getTag()) ^ r.getSbn().getId());
		}

		/**
		* @return Small hash of the channel ID, if present, or 0 otherwise.
		*/
		int getChannelIdHash() {
		return smallHash(r.getSbn().getNotification().getChannelId());
		return SmallHash.hash(r.getSbn().getNotification().getChannelId());
		}

		/**
		* @return Small hash of the group ID, respecting group override if present. 0 otherwise.
		*/
		int getGroupIdHash() {
		return smallHash(r.getSbn().getGroup());
		return SmallHash.hash(r.getSbn().getGroup());
		}

		}

		// "Small" hashes will be in the range [0, MAX_HASH).
		int MAX_HASH = (1 << 13);

		/**
		* Maps in to the range [0, MAX_HASH), keeping similar values distinct.
		* @param in An arbitrary integer.
		* @return in mod MAX_HASH, signs chosen to stay in the range [0, MAX_HASH).
		*/
		static int smallHash(int in) {
		return Math.floorMod(in, MAX_HASH);
		}

		/**
		* @return Small hash of the string, if non-null, or 0 otherwise.
		*/
		static int smallHash(@Nullable String in) {
		return smallHash(Objects.hashCode(in));
		}


		}

services/core/java/com/android/server/notification/SmallHash.java

0 → 100644

+44 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2020 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.server.notification;

		import java.util.Objects;

		/**
		* A simple hash function for use in privacy-sensitive logging. Few bits = lots of collisions.
		* See {@link NotificationRecordLogger}.
		*/
		public class SmallHash {
		// Hashes will be in the range [0, MAX_HASH).
		public static final int MAX_HASH = (1 << 13);

		/**
		* @return Small hash of the string, if non-null, or 0 otherwise.
		*/
		public static int hash(String in) {
		return hash(Objects.hashCode(in));
		}

		/**
		* Maps in to the range [0, MAX_HASH), keeping similar values distinct.
		* @param in An arbitrary integer.
		* @return in mod MAX_HASH, signs chosen to stay in the range [0, MAX_HASH).
		*/
		public static int hash(int in) {
		return Math.floorMod(in, MAX_HASH);
		}
		}

services/tests/uiservicestests/src/com/android/server/notification/NotificationRecordLoggerTest.java

+13 −13

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		@@ -60,16 +60,16 @@ public class NotificationRecordLoggerTest extends UiServiceTestCase {

		@Test
		public void testSmallHash() {
		assertEquals(0, NotificationRecordLogger.smallHash(0));
		final int maxHash = NotificationRecordLogger.MAX_HASH;
		assertEquals(0, SmallHash.hash(0));
		final int maxHash = SmallHash.MAX_HASH;
		assertEquals(0,
		NotificationRecordLogger.smallHash(maxHash));
		SmallHash.hash(maxHash));
		assertEquals(0,
		NotificationRecordLogger.smallHash(17 * maxHash));
		SmallHash.hash(17 * maxHash));
		assertEquals(maxHash - 1,
		NotificationRecordLogger.smallHash(maxHash - 1));
		SmallHash.hash(maxHash - 1));
		assertEquals(maxHash - 1,
		NotificationRecordLogger.smallHash(-1));
		SmallHash.hash(-1));
		}

		@Test
		@@ -78,10 +78,10 @@ public class NotificationRecordLoggerTest extends UiServiceTestCase {
		getNotificationRecordPair(0, null).getNotificationIdHash());
		assertEquals(1,
		getNotificationRecordPair(1, null).getNotificationIdHash());
		assertEquals(NotificationRecordLogger.MAX_HASH - 1,
		assertEquals(SmallHash.MAX_HASH - 1,
		getNotificationRecordPair(-1, null).getNotificationIdHash());
		final String tag = "someTag";
		final int hash = NotificationRecordLogger.smallHash(tag.hashCode());
		final int hash = SmallHash.hash(tag.hashCode());
		assertEquals(hash, getNotificationRecordPair(0, tag).getNotificationIdHash());
		// We xor the tag and hashcode together before compressing the range. The order of
		// operations doesn't matter if id is small.
		@@ -89,19 +89,19 @@ public class NotificationRecordLoggerTest extends UiServiceTestCase {
		getNotificationRecordPair(1, tag).getNotificationIdHash());
		// But it does matter for an id with more 1 bits than fit in the small hash.
		assertEquals(
		NotificationRecordLogger.smallHash(-1 ^ tag.hashCode()),
		SmallHash.hash(-1 ^ tag.hashCode()),
		getNotificationRecordPair(-1, tag).getNotificationIdHash());
		assertNotEquals(-1 ^ hash,
		NotificationRecordLogger.smallHash(-1 ^ tag.hashCode()));
		SmallHash.hash(-1 ^ tag.hashCode()));
		}

		@Test
		public void testGetChannelIdHash() {
		assertEquals(
		NotificationRecordLogger.smallHash(CHANNEL_ID.hashCode()),
		SmallHash.hash(CHANNEL_ID.hashCode()),
		getNotificationRecordPair(0, null).getChannelIdHash());
		assertNotEquals(
		NotificationRecordLogger.smallHash(CHANNEL_ID.hashCode()),
		SmallHash.hash(CHANNEL_ID.hashCode()),
		CHANNEL_ID.hashCode());
		}

		@@ -113,7 +113,7 @@ public class NotificationRecordLoggerTest extends UiServiceTestCase {
		final String group = "someGroup";
		p.r.setOverrideGroupKey(group);
		assertEquals(
		NotificationRecordLogger.smallHash(group.hashCode()),
		SmallHash.hash(group.hashCode()),
		p.getGroupIdHash());
		}
		}