com.googlecode.objectify.util

Class DatastoreUtils

java.lang.Object

com.googlecode.objectify.util.DatastoreUtils

public class DatastoreUtils
extends Object

Some static utility methods for interacting with basic datastore objects like keys and queries.

Constructor Summary

Constructors

Constructor and Description
DatastoreUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static com.google.appengine.api.datastore.Query	cloneQuery(com.google.appengine.api.datastore.Query orig) Make a new Query object that is exactly like the old.
static <T> Key<T>	createKey(Key<?> parent, Class<T> kind, Object id) Construct a Key from a Long or String id
static com.google.appengine.api.datastore.Key	createKey(com.google.appengine.api.datastore.Key parent, String kind, Object id) Construct a Key from a Long or String id
static <T> List<Key<T>>	createKeys(Key<?> parent, Class<T> kind, Iterable<?> ids) Make a list of Keys
static List<com.google.appengine.api.datastore.Key>	createKeys(com.google.appengine.api.datastore.Key parent, String kind, Iterable<?> ids) Make a list of keys
static <S> S	getId(com.google.appengine.api.datastore.Key key) Gets the String or Long id from the key, or null if incomplete
static <S> S	getId(Key<?> key) Gets the String or Long id from the key, or null if incomplete
static List<com.google.appengine.api.datastore.Key>	getRawKeys(Iterable<? extends Ref<?>> refs) Turn a list of refs into a list of raw keys.

Methods inherited from class java.lang.Object

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

Constructor Detail

DatastoreUtils

public DatastoreUtils()

Method Detail

getRawKeys

public static List<com.google.appengine.api.datastore.Key> getRawKeys(Iterable<? extends Ref<?>> refs)

Turn a list of refs into a list of raw keys.

cloneQuery

public static com.google.appengine.api.datastore.Query cloneQuery(com.google.appengine.api.datastore.Query orig)

Make a new Query object that is exactly like the old. Too bad Query isn't Cloneable.

createKey

public static <T> Key<T> createKey(Key<?> parent,
                   Class<T> kind,
                   Object id)

Construct a Key from a Long or String id

Parameters:

id - must be either Long or String

createKey

public static com.google.appengine.api.datastore.Key createKey(com.google.appengine.api.datastore.Key parent,
                                               String kind,
                                               Object id)

Construct a Key from a Long or String id

Parameters:

id - must be either Long or String

createKeys

public static List<com.google.appengine.api.datastore.Key> createKeys(com.google.appengine.api.datastore.Key parent,
                                                      String kind,
                                                      Iterable<?> ids)

Make a list of keys

Parameters:

ids - must contain either Long or String

createKeys

public static <T> List<Key<T>> createKeys(Key<?> parent,
                          Class<T> kind,
                          Iterable<?> ids)

Make a list of Keys

Parameters:

ids - must contain either Long or String

getId

public static <S> S getId(com.google.appengine.api.datastore.Key key)

Gets the String or Long id from the key, or null if incomplete

getId

public static <S> S getId(Key<?> key)

Gets the String or Long id from the key, or null if incomplete