Package org.ngengine.store

Class DataStore

java.lang.Object

org.ngengine.store.DataStore

public class DataStore
extends Object

A data store is key-value storage that can be used to store $Savable and serializable objects and primitives to a persistent storage.

It uses VStore internally and differentiates between cache and data stores, however the actual implementation is platform dependent and will use whatever form of storage is the most appropriate and efficient for the platform and the intended use case.

Constructor Summary

Constructors

Constructor	Description
DataStore(String appName, AssetManager assetManager, String name, boolean isCache)

Method Summary

Modifier and Type	Method	Description
void	delete(String key)	Deletes a key from the store.
boolean	exists(String key)	Checks if a key exists in the store.
org.ngengine.platform.VStore	getVStore()
List<String>	list()	Clears the store, deleting all keys.
<T> T	read(String key)	Reads a savable or serializable object or a primitive from the store.
void	write(String key, Object value)	Fully writes and commits a savable or serializable object or a primitive.

Methods inherited from class java.lang.Object

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

Constructor Details

DataStore

public DataStore(String appName,
 AssetManager assetManager,
 String name,
 boolean isCache)

Method Details

getVStore

public org.ngengine.platform.VStore getVStore()

write

public void write(String key,
 Object value)
           throws IOException

Fully writes and commits a savable or serializable object or a primitive.

Parameters:

key - the key to store the object under

value - the object to store, must be a Savable or serializable object

Throws:

IOException

read

public <T> T read(String key)
           throws IOException

Reads a savable or serializable object or a primitive from the store.

Parameters:

key - the key to read the object from

Returns:

the object read from the store, can be a Savable or a serializable object

Throws:

IOException - if reading fails

exists

public boolean exists(String key)

Checks if a key exists in the store.

Parameters:

key - the key to check

Returns:

true if the key exists, false otherwise

delete

public void delete(String key)

Deletes a key from the store.

Parameters:

key - the key to delete

list

public List<String> list()

Clears the store, deleting all keys.