| /* |
| * Copyright (c) 2010, Stanislav Muhametsin. All Rights Reserved. |
| * |
| * 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 org.qi4j.index.sql.support.common; |
| |
| /** |
| * Helper interface to let the user of SQL-Indexing decide when to re-build SQL schema. Rebuilding |
| * means first deleting all tables that are going to be used, and then creating them. Useful for |
| * tests or when your app is in dev mode. |
| * |
| * You can decide your application's re-building policy for example like this: |
| * {@code mainModule.addServices(RebuildingStrategy.class).withMixins(RebuildingStrategy.AlwaysNeed.class);} |
| * . This way your application will always re-build all index data at startup. |
| */ |
| public interface RebuildingStrategy |
| { |
| boolean rebuildingRequired( String dbAppVersion, String currentAppVersion ); |
| |
| /** |
| * The re-building strategy which ALWAYS re-builds the database schema. Useful with tests and |
| * during early development stage of application. |
| */ |
| public class AlwaysNeed |
| implements RebuildingStrategy |
| { |
| @Override |
| public boolean rebuildingRequired( String dbAppVersion, String currentAppVersion ) |
| { |
| return true; |
| } |
| } |
| |
| /** |
| * The re-building strategy which NEVER re-builds the database schema. Useful when current |
| * Zest-related database schema structure must be preserved at all costs. |
| */ |
| public class NeverNeed |
| implements RebuildingStrategy |
| { |
| @Override |
| public boolean rebuildingRequired( String dbAppVersion, String currentAppVersion ) |
| { |
| return false; |
| } |
| } |
| |
| /** |
| * The re-building strategy, which re-builds everything when application version changes. Useful |
| * when migration from versions is implemented, or when application structure changes along with |
| * version (but not during same version). |
| */ |
| public class NeedOnChange |
| implements RebuildingStrategy |
| { |
| @Override |
| public boolean rebuildingRequired( String dbAppVersion, String currentAppVersion ) |
| { |
| return !dbAppVersion.equals( currentAppVersion ); |
| } |
| } |
| |
| } |