A class for managing application migration across updates

Migrator.java

/**
 * A simple class for managing application migration across updates.
 *
 * Created by aashreys on 24/04/17.
 */

public class Migrator {

    private static final String KEY_LAST_VERSION = "migrator_key_last_version";

    private static final int CURRENT_VERSION = Version.V10;

    private final KeyValueStore keyValueStore;

    @Inject
    public Migrator(KeyValueStore keyValueStore) {
        this.keyValueStore = keyValueStore;
    }

    private int getLastVersion() {
        return keyValueStore.getInt(KEY_LAST_VERSION, Version.V0);
    }

    public void migrate() {
        int lastVersion = getLastVersion();
        switch (lastVersion) {
            case Version.V0:
                migrateFromV0ToV10();
            // Add more migrations here
            case CURRENT_VERSION:
                break;
        }
        completeMigration();
    }
    
    private void completeMigration() {
        keyValueStore.getInt(KEY_LAST_VERSION, CURRENT_VERSION);
    }

    private void migrateFromV0ToV10() {
        // Migrate stuff here
    }

    private interface Version {

        int V0 = 0;
        int V10 = 10;

    }

}