com.google.api.client.util.store

Class AbstractDataStore<V extends Serializable>

java.lang.Object

com.google.api.client.util.store.AbstractDataStore<V>

Type Parameters:

V - serializable type of the mapped value

All Implemented Interfaces:

DataStore<V>

Direct Known Subclasses:

AbstractMemoryDataStore

public abstract class AbstractDataStore<V extends Serializable>
extends Object
implements DataStore<V>

Abstract data store implementation.

Since:

1.16

Author:

Yaniv Inbar

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractDataStore(DataStoreFactory dataStoreFactory, String id)

Method Summary

Modifier and Type	Method and Description
boolean	containsKey(String key) Returns whether the store contains the given key.
boolean	containsValue(V value) Returns whether the store contains the given value.
DataStoreFactory	getDataStoreFactory() Returns the data store factory.
String	getId() Returns the data store ID.
boolean	isEmpty() Returns whether there are any stored keys.
int	size() Returns the number of stored keys.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.google.api.client.util.store.DataStore

clear, delete, get, keySet, set, values

Constructor Detail

AbstractDataStore

protected AbstractDataStore(DataStoreFactory dataStoreFactory,
                            String id)

Parameters:

dataStoreFactory - data store factory

id - data store ID

Method Detail

getDataStoreFactory

public DataStoreFactory getDataStoreFactory()

Returns the data store factory.

Overriding is only supported for the purpose of calling the super implementation and changing the return type, but nothing else.

Specified by:

getDataStoreFactory in interface DataStore<V extends Serializable>

getId

public final String getId()

Description copied from interface: DataStore

Returns the data store ID.

Specified by:

getId in interface DataStore<V extends Serializable>

containsKey

public boolean containsKey(String key)
                    throws IOException

Returns whether the store contains the given key.

Default implementation is to call DataStore.get(String) and check if it is null.

Specified by:

containsKey in interface DataStore<V extends Serializable>

Throws:

IOException

containsValue

public boolean containsValue(V value)
                      throws IOException

Returns whether the store contains the given value.

Default implementation is to call Collection.contains(Object) on DataStore.values().

Specified by:

containsValue in interface DataStore<V extends Serializable>

Throws:

IOException

isEmpty

public boolean isEmpty()
                throws IOException

Returns whether there are any stored keys.

Default implementation is to check if size() is 0.

Specified by:

isEmpty in interface DataStore<V extends Serializable>

Throws:

IOException

size

public int size()
         throws IOException

Returns the number of stored keys.

Default implementation is to call Set.size() on DataStore.keySet().

Specified by:

size in interface DataStore<V extends Serializable>

Throws:

IOException