it.polimi.dima.mediatracker.controllers

Class DatabaseManager

java.lang.Object

it.polimi.dima.mediatracker.controllers.DatabaseManager

public class DatabaseManager
extends java.lang.Object

Manages the application database (e.g. import/export) It does NOT manage: - insert/delete/update queries (taken care by the external library Sugar ORM) - select queries (taken care by the implementations of MediaItemsAbstractController and by CategoriesController)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	DatabaseManager.DBImportValidationException An exception thrown during DB import if data has some validation error

Method Summary

Modifier and Type	Method and Description
void	exportDatabase(Context context) Function to export the application database to a JSON file.
static DatabaseManager	getInstance() Singleton pattern
void	importDatabase(Context context, Uri fileUri) Function to import the application database from a JSON file

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getInstance

public static DatabaseManager getInstance()

Singleton pattern

exportDatabase

public void exportDatabase(Context context)

Function to export the application database to a JSON file. The method creates the JSON file and then opens a send intent to allow the user to save the file somewhere

Parameters:

context - the context

importDatabase

public void importDatabase(Context context,
                           Uri fileUri)
                    throws DatabaseManager.DBImportValidationException,
                           java.io.IOException,
                           JSONException

Function to import the application database from a JSON file

Parameters:

context - the context

fileUri - the URL of the file

Throws:

DatabaseManager.DBImportValidationException - if something went wrong with the import

java.io.IOException - if the file cannot be accessed

JSONException