Merge "Revert "Implement country-dependent detection logic"" (95c5e40d) · Commits · e / os / android_frameworks_opt_telephony

src/java/com/android/internal/telephony/NitzStateMachineImpl.java

+8 −39

Original line number	Diff line number	Diff line
		@@ -202,7 +202,6 @@ public final class NitzStateMachineImpl implements NitzStateMachine {
		} else {
		OffsetResult lookupResult =
		mTimeZoneLookupHelper.lookupByNitzCountry(nitzData, isoCountryCode);
		if (lookupResult != null) {
		if (DBG) {
		Rlog.d(LOG_TAG, "updateTimeZoneFromCountryAndNitz: using"
		+ " lookupByNitzCountry(nitzData, isoCountryCode),"
		@@ -210,35 +209,7 @@ public final class NitzStateMachineImpl implements NitzStateMachine {
		+ " isoCountryCode=" + isoCountryCode
		+ " lookupResult=" + lookupResult);
		}
		zoneId = lookupResult.getTimeZone().getID();
		} else {
		// The country + offset provided no match, so see if the country by itself
		// would be enough.
		CountryResult countryResult = mTimeZoneLookupHelper.lookupByCountry(
		isoCountryCode, nitzData.getCurrentTimeInMillis());
		if (DBG) {
		Rlog.d(LOG_TAG, "updateTimeZoneFromCountryAndNitz: fallback to"
		+ " lookupByCountry(isoCountryCode, whenMillis),"
		+ " nitzData=" + nitzData
		+ " isoCountryCode=" + isoCountryCode
		+ " countryResult=" + countryResult);
		}
		if (countryResult != null) {
		// If the country has a single zone, or it has multiple zones but the
		// default is "boosted" (i.e. it is considered a good result in most cases)
		// then use it.
		if (countryResult.quality == CountryResult.QUALITY_SINGLE_ZONE
		\|\| countryResult.quality == CountryResult.QUALITY_DEFAULT_BOOSTED) {
		zoneId = countryResult.zoneId;
		} else {
		// Quality is not high enough.
		zoneId = null;
		}
		} else {
		// Country not recognized.
		zoneId = null;
		}
		}
		zoneId = lookupResult != null ? lookupResult.getTimeZone().getID() : null;
		}

		String logMsg = "updateTimeZoneFromCountryAndNitz:"
		@@ -519,9 +490,7 @@ public final class NitzStateMachineImpl implements NitzStateMachine {
		private void updateTimeZoneFromNetworkCountryCode(String iso) {
		CountryResult lookupResult = mTimeZoneLookupHelper.lookupByCountry(
		iso, mDeviceState.currentTimeMillis());
		if (lookupResult != null
		&& (lookupResult.quality == CountryResult.QUALITY_SINGLE_ZONE
		\|\| lookupResult.quality == CountryResult.QUALITY_DEFAULT_BOOSTED)) {
		if (lookupResult != null && lookupResult.allZonesHaveSameOffset) {
		String logMsg = "updateTimeZoneFromNetworkCountryCode: tz result found"
		+ " iso=" + iso
		+ " lookupResult=" + lookupResult;

src/java/com/android/internal/telephony/TimeZoneLookupHelper.java

+79 −77

Original line number	Diff line number	Diff line
		@@ -16,10 +16,6 @@

		package com.android.internal.telephony;

		import static com.android.internal.telephony.TimeZoneLookupHelper.CountryResult.QUALITY_MULTIPLE_ZONES_DIFFERENT_OFFSETS;
		import static com.android.internal.telephony.TimeZoneLookupHelper.CountryResult.QUALITY_MULTIPLE_ZONES_SAME_OFFSET;

		import android.annotation.IntDef;
		import android.icu.util.TimeZone;
		import android.text.TextUtils;

		@@ -27,8 +23,6 @@ import libcore.timezone.CountryTimeZones;
		import libcore.timezone.CountryTimeZones.TimeZoneMapping;
		import libcore.timezone.TimeZoneFinder;

		import java.lang.annotation.Retention;
		import java.lang.annotation.RetentionPolicy;
		import java.util.List;
		import java.util.Objects;

		@@ -100,35 +94,32 @@ public class TimeZoneLookupHelper {
		*/
		public static final class CountryResult {

		@IntDef({ QUALITY_SINGLE_ZONE, QUALITY_DEFAULT_BOOSTED, QUALITY_MULTIPLE_ZONES_SAME_OFFSET,
		QUALITY_MULTIPLE_ZONES_DIFFERENT_OFFSETS })
		@Retention(RetentionPolicy.SOURCE)
		public @interface Quality {}

		public static final int QUALITY_SINGLE_ZONE = 1;
		public static final int QUALITY_DEFAULT_BOOSTED = 2;
		public static final int QUALITY_MULTIPLE_ZONES_SAME_OFFSET = 3;
		public static final int QUALITY_MULTIPLE_ZONES_DIFFERENT_OFFSETS = 4;

		/** A time zone to use for the country. */
		public final String zoneId;

		/**
		* The quality of the match.
		* True if the country has multiple effective zones to choose from at {@link #whenMillis}.
		*/
		public final boolean multipleZonesInCountry;

		/**
		* True if all the effective time zones in the country have the same offset at
		* {@link #whenMillis}.
		*/
		@Quality
		public final int quality;
		public final boolean allZonesHaveSameOffset;

		/**
		* Freeform information about why the value of {@link #quality} was chosen. Not used for
		* {@link #equals(Object)}.
		* The time associated with {@link #allZonesHaveSameOffset} and
		* {@link #multipleZonesInCountry}.
		*/
		private final String mDebugInfo;
		public final long whenMillis;

		public CountryResult(String zoneId, @Quality int quality, String debugInfo) {
		public CountryResult(String zoneId, boolean multipleZonesInCountry,
		boolean allZonesHaveSameOffset, long whenMillis) {
		this.zoneId = zoneId;
		this.quality = quality;
		mDebugInfo = debugInfo;
		this.multipleZonesInCountry = multipleZonesInCountry;
		this.allZonesHaveSameOffset = allZonesHaveSameOffset;
		this.whenMillis = whenMillis;
		}

		@Override
		@@ -139,22 +130,37 @@ public class TimeZoneLookupHelper {
		if (o == null \|\| getClass() != o.getClass()) {
		return false;
		}

		CountryResult that = (CountryResult) o;
		return quality == that.quality
		&& zoneId.equals(that.zoneId);

		if (multipleZonesInCountry != that.multipleZonesInCountry) {
		return false;
		}
		if (allZonesHaveSameOffset != that.allZonesHaveSameOffset) {
		return false;
		}
		if (whenMillis != that.whenMillis) {
		return false;
		}
		return zoneId.equals(that.zoneId);
		}

		@Override
		public int hashCode() {
		return Objects.hash(zoneId, quality);
		int result = zoneId.hashCode();
		result = 31 * result + (multipleZonesInCountry ? 1 : 0);
		result = 31 * result + (allZonesHaveSameOffset ? 1 : 0);
		result = 31 * result + (int) (whenMillis ^ (whenMillis >>> 32));
		return result;
		}

		@Override
		public String toString() {
		return "CountryResult{"
		+ "zoneId='" + zoneId + '\''
		+ ", quality=" + quality
		+ ", mDebugInfo=" + mDebugInfo
		+ ", multipleZonesInCountry=" + multipleZonesInCountry
		+ ", allZonesHaveSameOffset=" + allZonesHaveSameOffset
		+ ", whenMillis=" + whenMillis
		+ '}';
		}
		}
		@@ -220,48 +226,42 @@ public class TimeZoneLookupHelper {
		// Unknown country code.
		return null;
		}
		TimeZone countryDefaultZone = countryTimeZones.getDefaultTimeZone();
		if (countryDefaultZone == null) {
		// This is not expected: the country default should have been validated before.
		if (countryTimeZones.getDefaultTimeZoneId() == null) {
		return null;
		}

		String debugInfo;
		int matchQuality;
		if (countryTimeZones.getDefaultTimeZoneBoost()) {
		matchQuality = CountryResult.QUALITY_DEFAULT_BOOSTED;
		debugInfo = "Country default is boosted";
		} else {
		List<TimeZoneMapping> effectiveTimeZoneMappings =
		countryTimeZones.getEffectiveTimeZoneMappingsAt(whenMillis);
		if (effectiveTimeZoneMappings.isEmpty()) {
		// This should never happen unless there's been an error loading the data.
		// Treat it the same as a low quality answer.
		matchQuality = QUALITY_MULTIPLE_ZONES_DIFFERENT_OFFSETS;
		debugInfo = "No effective time zones found at whenMillis=" + whenMillis;
		} else if (effectiveTimeZoneMappings.size() == 1) {
		boolean multipleZonesInCountry = effectiveTimeZoneMappings.size() > 1;
		boolean defaultOkForCountryTimeZoneDetection = isDefaultOkForCountryTimeZoneDetection(
		countryTimeZones.getDefaultTimeZone(), effectiveTimeZoneMappings, whenMillis);
		return new CountryResult(
		countryTimeZones.getDefaultTimeZoneId(), multipleZonesInCountry,
		defaultOkForCountryTimeZoneDetection, whenMillis);
		}

		/**
		* Returns {@code true} if the default time zone for the country is either the only zone used or
		* if it has the same offsets as all other zones used by the country <em>at the specified time
		* </em> making the default equivalent to all other zones used by the country <em>at that time
		* </em>.
		*/
		private static boolean isDefaultOkForCountryTimeZoneDetection(
		TimeZone countryDefault, List<TimeZoneMapping> timeZoneMappings, long whenMillis) {
		if (timeZoneMappings.isEmpty()) {
		// Should never happen unless there's been an error loading the data.
		return false;
		} else if (timeZoneMappings.size() == 1) {
		// The default is the only zone so it's a good candidate.
		matchQuality = CountryResult.QUALITY_SINGLE_ZONE;
		debugInfo = "One effective time zone found at whenMillis=" + whenMillis;
		return true;
		} else {
		boolean countryUsesDifferentOffsets = countryUsesDifferentOffsets(
		whenMillis, effectiveTimeZoneMappings, countryDefaultZone);
		matchQuality = countryUsesDifferentOffsets
		? QUALITY_MULTIPLE_ZONES_DIFFERENT_OFFSETS
		: QUALITY_MULTIPLE_ZONES_SAME_OFFSET;
		debugInfo = "countryUsesDifferentOffsets=" + countryUsesDifferentOffsets + " at"
		+ " whenMillis=" + whenMillis;
		}
		}
		return new CountryResult(countryDefaultZone.getID(), matchQuality, debugInfo);
		if (countryDefault == null) {
		return false;
		}

		private static boolean countryUsesDifferentOffsets(
		long whenMillis, List<TimeZoneMapping> effectiveTimeZoneMappings,
		TimeZone countryDefaultZone) {
		String countryDefaultId = countryDefaultZone.getID();
		int countryDefaultOffset = countryDefaultZone.getOffset(whenMillis);
		for (TimeZoneMapping timeZoneMapping : effectiveTimeZoneMappings) {
		String countryDefaultId = countryDefault.getID();
		int countryDefaultOffset = countryDefault.getOffset(whenMillis);
		for (TimeZoneMapping timeZoneMapping : timeZoneMappings) {
		if (timeZoneMapping.timeZoneId.equals(countryDefaultId)) {
		continue;
		}
		@@ -273,10 +273,12 @@ public class TimeZoneLookupHelper {

		int candidateOffset = timeZone.getOffset(whenMillis);
		if (countryDefaultOffset != candidateOffset) {
		return true;
		// Multiple different offsets means the default should not be used.
		return false;
		}
		}
		return false;
		return true;
		}
		}

		/**

tests/telephonytests/src/com/android/internal/telephony/NitzStateMachineImplTest.java

+11 −136

Original line number	Diff line number	Diff line
		@@ -19,10 +19,7 @@ package com.android.internal.telephony;
		import static com.android.internal.telephony.NitzStateMachineTestSupport.ARBITRARY_SYSTEM_CLOCK_TIME;
		import static com.android.internal.telephony.NitzStateMachineTestSupport.ARBITRARY_TIME_ZONE_ID;
		import static com.android.internal.telephony.NitzStateMachineTestSupport.CZECHIA_SCENARIO;
		import static com.android.internal.telephony.NitzStateMachineTestSupport.NEW_ZEALAND_DEFAULT_SCENARIO;
		import static com.android.internal.telephony.NitzStateMachineTestSupport.NEW_ZEALAND_OTHER_SCENARIO;
		import static com.android.internal.telephony.NitzStateMachineTestSupport.UNIQUE_US_ZONE_SCENARIO1;
		import static com.android.internal.telephony.NitzStateMachineTestSupport.UNIQUE_US_ZONE_SCENARIO2;
		import static com.android.internal.telephony.NitzStateMachineTestSupport.UNIQUE_US_ZONE_SCENARIO;
		import static com.android.internal.telephony.NitzStateMachineTestSupport.UNITED_KINGDOM_SCENARIO;
		import static com.android.internal.telephony.NitzStateMachineTestSupport.createTimeSignalFromNitzSignal;

		@@ -77,7 +74,7 @@ public class NitzStateMachineImplTest extends TelephonyTest {

		@Test
		public void test_uniqueUsZone_timeZoneEnabled_countryThenNitz() throws Exception {
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO1;
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO;
		Script script = new Script()
		.initializeSystemClock(ARBITRARY_SYSTEM_CLOCK_TIME)
		.initializeTimeZoneDetectionEnabled(true)
		@@ -123,131 +120,9 @@ public class NitzStateMachineImplTest extends TelephonyTest {
		assertEquals(nitzSignal.getValue(), mNitzStateMachine.getCachedNitzData());
		}

		@Test
		public void test_countryDefaultBoost_timeZoneEnabled_countryThenNitz() throws Exception {
		Script script = new Script()
		.initializeSystemClock(ARBITRARY_SYSTEM_CLOCK_TIME)
		.initializeTimeZoneDetectionEnabled(true)
		.initializeTimeZoneSetting("Europe/London");

		// Demonstrate the defaultTimeZoneBoost behavior: we can get a zone only from the
		// countryIsoCode.
		{
		Scenario scenario = NEW_ZEALAND_DEFAULT_SCENARIO;
		TimestampedValue<NitzData> nitzSignal =
		scenario.createNitzSignal(mFakeDeviceState.elapsedRealtime());
		script.countryReceived(scenario.getNetworkCountryIsoCode())
		// Even though there are multiple zones in the country, countryIsoCode is enough
		// to guess the time zone because the default zone is boosted.
		.verifyOnlyTimeZoneWasSetAndReset(scenario.getTimeZoneId());

		// Confirm what happens when NITZ doesn't conflict with the country-only result.
		script.nitzReceived(nitzSignal)
		// Country + NITZ is enough for both time + time zone detection.
		.verifyTimeSuggestedAndZoneSetAndReset(
		scenario.createTimeSignal(mFakeDeviceState.elapsedRealtime()),
		scenario.getTimeZoneId());

		// Check NitzStateMachine state.
		assertTrue(mNitzStateMachine.getNitzTimeZoneDetectionSuccessful());
		assertEquals(nitzSignal.getValue(), mNitzStateMachine.getCachedNitzData());
		}

		// A valid NITZ signal for the non-default zone should still be correctly detected.
		{
		Scenario scenario = NEW_ZEALAND_OTHER_SCENARIO;
		TimestampedValue<NitzData> nitzSignal =
		scenario.createNitzSignal(mFakeDeviceState.elapsedRealtime());
		script.nitzReceived(nitzSignal)
		// Time won't be set because the UTC signal will be the same.
		.verifyOnlyTimeZoneWasSetAndReset(scenario.getTimeZoneId());

		// Check NitzStateMachine state.
		assertTrue(mNitzStateMachine.getNitzTimeZoneDetectionSuccessful());
		assertEquals(nitzSignal.getValue(), mNitzStateMachine.getCachedNitzData());
		}

		// Demonstrate what happens with a bogus NITZ for NZ: because the default zone is boosted
		// then we should return to the country default zone.
		{
		// A scenario that has a different offset than NZ.
		Scenario scenario = CZECHIA_SCENARIO;
		TimestampedValue<NitzData> nitzSignal =
		scenario.createNitzSignal(mFakeDeviceState.elapsedRealtime());
		String expectedTimeZoneId = NEW_ZEALAND_DEFAULT_SCENARIO.getTimeZoneId();
		script.nitzReceived(nitzSignal)
		// Time won't be set because the UTC signal will be the same.
		.verifyOnlyTimeZoneWasSetAndReset(expectedTimeZoneId);

		// Check NitzStateMachine state.
		assertTrue(mNitzStateMachine.getNitzTimeZoneDetectionSuccessful());
		assertEquals(nitzSignal.getValue(), mNitzStateMachine.getCachedNitzData());
		}
		}

		@Test
		public void test_noCountryDefaultBoost_timeZoneEnabled_countryThenNitz() throws Exception {
		Script script = new Script()
		.initializeSystemClock(ARBITRARY_SYSTEM_CLOCK_TIME)
		.initializeTimeZoneDetectionEnabled(true)
		.initializeTimeZoneSetting("Europe/London");

		// Demonstrate the behavior without default country boost for a country with multiple zones:
		// we cannot get a zone only from the countryIsoCode.
		{
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO1;
		TimestampedValue<NitzData> nitzSignal =
		scenario.createNitzSignal(mFakeDeviceState.elapsedRealtime());
		script.countryReceived(scenario.getNetworkCountryIsoCode())
		// The country should no be enough to guess time zone.
		.verifyNothingWasSetAndReset();

		// The NITZ signal + country iso code will be enough.
		script.nitzReceived(nitzSignal)
		// Country + NITZ is enough for both time + time zone detection.
		.verifyTimeSuggestedAndZoneSetAndReset(
		scenario.createTimeSignal(mFakeDeviceState.elapsedRealtime()),
		scenario.getTimeZoneId());

		// Check NitzStateMachine state.
		assertTrue(mNitzStateMachine.getNitzTimeZoneDetectionSuccessful());
		assertEquals(nitzSignal.getValue(), mNitzStateMachine.getCachedNitzData());
		}

		// A valid NITZ signal for a different zone should also be correctly detected.
		{
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO2;
		TimestampedValue<NitzData> nitzSignal =
		scenario.createNitzSignal(mFakeDeviceState.elapsedRealtime());
		script.nitzReceived(nitzSignal)
		// Time won't be set because the UTC signal will be the same.
		.verifyOnlyTimeZoneWasSetAndReset(scenario.getTimeZoneId());

		// Check NitzStateMachine state.
		assertTrue(mNitzStateMachine.getNitzTimeZoneDetectionSuccessful());
		assertEquals(nitzSignal.getValue(), mNitzStateMachine.getCachedNitzData());
		}

		// Demonstrate what happens with a bogus NITZ for US: because the default zone is not
		// boosted we should not change anything.
		{
		// A scenario that has a different offset than US.
		Scenario scenario = CZECHIA_SCENARIO;
		TimestampedValue<NitzData> nitzSignal =
		scenario.createNitzSignal(mFakeDeviceState.elapsedRealtime());
		script.nitzReceived(nitzSignal)
		// Time won't be set because the UTC signal will be the same.
		.verifyNothingWasSetAndReset();

		// Check NitzStateMachine state.
		assertTrue(mNitzStateMachine.getNitzTimeZoneDetectionSuccessful());
		assertEquals(nitzSignal.getValue(), mNitzStateMachine.getCachedNitzData());
		}
		}

		@Test
		public void test_uniqueUsZone_timeZoneDisabled_countryThenNitz() throws Exception {
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO1;
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO;
		Script script = new Script()
		.initializeSystemClock(ARBITRARY_SYSTEM_CLOCK_TIME)
		.initializeTimeZoneDetectionEnabled(false)
		@@ -293,7 +168,7 @@ public class NitzStateMachineImplTest extends TelephonyTest {

		@Test
		public void test_uniqueUsZone_timeZoneEnabled_nitzThenCountry() throws Exception {
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO1;
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO;
		Script script = new Script()
		.initializeSystemClock(ARBITRARY_SYSTEM_CLOCK_TIME)
		.initializeTimeZoneDetectionEnabled(true)
		@@ -493,7 +368,7 @@ public class NitzStateMachineImplTest extends TelephonyTest {

		@Test
		public void test_bogusUniqueUsNitzSignal_nitzReceivedFirst() throws Exception {
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO1;
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO;
		Script script = new Script()
		.initializeSystemClock(ARBITRARY_SYSTEM_CLOCK_TIME)
		.initializeTimeZoneDetectionEnabled(true)
		@@ -533,7 +408,7 @@ public class NitzStateMachineImplTest extends TelephonyTest {

		@Test
		public void test_bogusUsUniqueNitzSignal_countryReceivedFirst() throws Exception {
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO1;
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO;
		Script script = new Script()
		.initializeSystemClock(ARBITRARY_SYSTEM_CLOCK_TIME)
		.initializeTimeZoneDetectionEnabled(true)
		@@ -572,7 +447,7 @@ public class NitzStateMachineImplTest extends TelephonyTest {

		@Test
		public void test_emulatorNitzExtensionUsedForTimeZone() throws Exception {
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO1;
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO;
		Script script = new Script()
		.initializeSystemClock(ARBITRARY_SYSTEM_CLOCK_TIME)
		.initializeTimeZoneDetectionEnabled(true)
		@@ -605,7 +480,7 @@ public class NitzStateMachineImplTest extends TelephonyTest {

		@Test
		public void test_emptyCountryStringUsTime_countryReceivedFirst() throws Exception {
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO1;
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO;
		Script script = new Script()
		.initializeSystemClock(ARBITRARY_SYSTEM_CLOCK_TIME)
		.initializeTimeZoneDetectionEnabled(true)
		@@ -635,7 +510,7 @@ public class NitzStateMachineImplTest extends TelephonyTest {

		@Test
		public void test_emptyCountryStringUsTime_nitzReceivedFirst() throws Exception {
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO1;
		Scenario scenario = UNIQUE_US_ZONE_SCENARIO;
		Script script = new Script()
		.initializeSystemClock(ARBITRARY_SYSTEM_CLOCK_TIME)
		.initializeTimeZoneDetectionEnabled(true)
		@@ -740,8 +615,8 @@ public class NitzStateMachineImplTest extends TelephonyTest {
		script.incrementTime(timeStepMillis);

		// Simulate the movement to the destination.
		scenario.changeCountry(UNIQUE_US_ZONE_SCENARIO1.getTimeZoneId(),
		UNIQUE_US_ZONE_SCENARIO1.getNetworkCountryIsoCode());
		scenario.changeCountry(UNIQUE_US_ZONE_SCENARIO.getTimeZoneId(),
		UNIQUE_US_ZONE_SCENARIO.getNetworkCountryIsoCode());

		// Simulate the device receiving NITZ signals again after the flight. Now the
		// NitzStateMachineImpl is opinionated again.

tests/telephonytests/src/com/android/internal/telephony/NitzStateMachineTestSupport.java

+4 −27

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tests/telephonytests/src/com/android/internal/telephony/NitzStateMachineTestSupportTest.java

+26 −80

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