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/*
* 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 android.timezone;
import android.annotation.NonNull;
import android.annotation.Nullable;
import com.android.i18n.timezone.TimeZoneDataFiles;
import com.android.internal.annotations.VisibleForTesting;
import java.io.IOException;
import java.util.Objects;
/**
* Version information associated with the set of time zone data on a device.
*
* <p>Time Zone Data Sets have a major ({@link #getFormatMajorVersion()}) and minor
* ({@link #currentFormatMinorVersion()}) version number:
* <ul>
* <li>Major version numbers are mutually incompatible. e.g. v2 is not compatible with a v1 or a
* v3 device.</li>
* <li>Minor version numbers are backwards compatible. e.g. a v2.2 data set will work
* on a v2.1 device but not a v2.3 device. The minor version is reset to 1 when the major version
* is incremented.</li>
* </ul>
*
* <p>Data sets contain time zone rules and other data associated wtih a tzdb release
* ({@link #getRulesVersion()}) and an additional Android-specific revision number
* ({@link #getRevision()}).
*
* <p>See platform/system/timezone/README.android for more information.
* @hide
*/
@VisibleForTesting
public final class TzDataSetVersion {
/**
* Returns the major tz data format version supported by this device.
*/
public static int currentFormatMajorVersion() {
return com.android.i18n.timezone.TzDataSetVersion.currentFormatMajorVersion();
}
/**
* Returns the minor tz data format version supported by this device.
*/
public static int currentFormatMinorVersion() {
return com.android.i18n.timezone.TzDataSetVersion.currentFormatMinorVersion();
}
/**
* Returns true if the version information provided would be compatible with this device, i.e.
* with the current system image, and set of active modules.
*/
public static boolean isCompatibleWithThisDevice(TzDataSetVersion tzDataSetVersion) {
return com.android.i18n.timezone.TzDataSetVersion.isCompatibleWithThisDevice(
tzDataSetVersion.mDelegate);
}
/**
* Reads the current Android time zone data set version file.
*/
@NonNull
public static TzDataSetVersion read() throws IOException, TzDataSetException {
try {
return new TzDataSetVersion(TimeZoneDataFiles.readTimeZoneModuleVersion());
} catch (com.android.i18n.timezone.TzDataSetVersion.TzDataSetException e) {
throw new TzDataSetException(e.getMessage(), e);
}
}
/**
* A checked exception used in connection with time zone data sets.
* @hide
*/
public static final class TzDataSetException extends Exception {
/** Creates an instance with a message. */
public TzDataSetException(String message) {
super(message);
}
/** Creates an instance with a message and a cause. */
public TzDataSetException(String message, Throwable cause) {
super(message, cause);
}
}
@NonNull
private final com.android.i18n.timezone.TzDataSetVersion mDelegate;
private TzDataSetVersion(@NonNull com.android.i18n.timezone.TzDataSetVersion delegate) {
mDelegate = Objects.requireNonNull(delegate);
}
/** Returns the major version number. See {@link TzDataSetVersion}. */
public int getFormatMajorVersion() {
return mDelegate.getFormatMajorVersion();
}
/** Returns the minor version number. See {@link TzDataSetVersion}. */
public int getFormatMinorVersion() {
return mDelegate.getFormatMinorVersion();
}
/** Returns the tzdb version string. See {@link TzDataSetVersion}. */
@NonNull
public String getRulesVersion() {
return mDelegate.getRulesVersion();
}
/** Returns the Android revision. See {@link TzDataSetVersion}. */
public int getRevision() {
return mDelegate.getRevision();
}
@Override
public boolean equals(@Nullable Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
TzDataSetVersion that = (TzDataSetVersion) o;
return mDelegate.equals(that.mDelegate);
}
@Override
public int hashCode() {
return Objects.hash(mDelegate);
}
@Override
public String toString() {
return mDelegate.toString();
}
}
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