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/*
* Copyright (C) 2012 Google Inc.
* Licensed to 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.mail.preferences;
import android.content.Context;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* Interface to allow migrating preferences from other projects into the UnifiedEmail code, so apps
* can slowly move their preferences into the shared code.
*/
public abstract class BasePreferenceMigrator {
/** If <code>true</code>, we have not attempted a migration since the app started. */
private static final AtomicBoolean sMigrationNecessary = new AtomicBoolean(true);
public final boolean performMigration(
final Context context, final int oldVersion, final int newVersion) {
// Ensure we only run this once
if (sMigrationNecessary.getAndSet(false)) {
migrate(context, oldVersion, newVersion);
return true;
}
return false;
}
/**
* Migrates preferences to UnifiedEmail.
*
* @param oldVersion The previous version of UnifiedEmail's preferences
* @param newVersion The new version of UnifiedEmail's preferences
*/
protected abstract void migrate(final Context context, int oldVersion, int newVersion);
}
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