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/*
* Copyright (C) 2015 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.messaging.datamodel;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import com.android.messaging.Factory;
import com.android.messaging.util.Assert;
import com.android.messaging.util.LogUtil;
public class DatabaseUpgradeHelper {
private static final String TAG = LogUtil.BUGLE_DATABASE_TAG;
public void doOnUpgrade(final SQLiteDatabase db, final int oldVersion, final int newVersion) {
Assert.isTrue(newVersion >= oldVersion);
if (oldVersion == newVersion) {
return;
}
LogUtil.i(TAG, "Database upgrade started from version " + oldVersion + " to " + newVersion);
try {
doUpgradeWithExceptions(db, oldVersion, newVersion);
LogUtil.i(TAG, "Finished database upgrade");
} catch (final Exception ex) {
LogUtil.e(TAG, "Failed to perform db upgrade from version " +
oldVersion + " to version " + newVersion, ex);
DatabaseHelper.rebuildTables(db);
}
}
public void doUpgradeWithExceptions(final SQLiteDatabase db, final int oldVersion,
final int newVersion) throws Exception {
int currentVersion = oldVersion;
if (currentVersion < 2) {
currentVersion = upgradeToVersion2(db);
}
// Rebuild all the views
final Context context = Factory.get().getApplicationContext();
DatabaseHelper.dropAllViews(db);
DatabaseHelper.rebuildAllViews(new DatabaseWrapper(context, db));
// Finally, check if we have arrived at the final version.
checkAndUpdateVersionAtReleaseEnd(currentVersion, Integer.MAX_VALUE, newVersion);
}
private int upgradeToVersion2(final SQLiteDatabase db) {
db.execSQL("ALTER TABLE " + DatabaseHelper.CONVERSATIONS_TABLE + " ADD COLUMN " +
DatabaseHelper.ConversationColumns.IS_ENTERPRISE + " INT DEFAULT(0)");
LogUtil.i(TAG, "Ugraded database to version 2");
return 2;
}
/**
* Checks db version correctness at the end of each milestone release. If target database
* version lies beyond the version range that the current release may handle, we snap the
* current version to the end of the release, so that we may go on to the next release' upgrade
* path. Otherwise, if target version is within reach of the current release, but we are not
* at the target version, then throw an exception to force a table rebuild.
*/
private int checkAndUpdateVersionAtReleaseEnd(final int currentVersion,
final int maxVersionForRelease, final int targetVersion) throws Exception {
if (maxVersionForRelease < targetVersion) {
// Target version is beyond the current release. Snap to max version for the
// current release so we can go on to the upgrade path for the next release.
return maxVersionForRelease;
}
// If we are here, this means the current release' upgrade handler should upgrade to
// target version...
if (currentVersion != targetVersion) {
// No more upgrade handlers. So we can't possibly upgrade to the final version.
throw new Exception("Missing upgrade handler from version " +
currentVersion + " to version " + targetVersion);
}
// Upgrade succeeded.
return targetVersion;
}
public void onDowngrade(final SQLiteDatabase db, final int oldVersion, final int newVersion) {
DatabaseHelper.rebuildTables(db);
LogUtil.e(TAG, "Database downgrade requested for version " +
oldVersion + " version " + newVersion + ", forcing db rebuild!");
}
}
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