com.google.cloud.datastore

Class BaseEntity<K extends IncompleteKey>

java.lang.Object

com.google.cloud.datastore.BaseEntity<K>

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

FullEntity, ProjectionEntity

public abstract class BaseEntity<K extends IncompleteKey>
extends Object
implements Serializable

A base class for entities (key and properties). An entity is a Google Cloud Datastore persistent data object. An entity holds one or more properties, represented by a name (as String) and a value (as Value), and may be associated with a key. For a list of possible values see ValueType.

See Also:

Google Cloud Datastore Entities, Properties, and Keys, Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	BaseEntity.Builder<K extends IncompleteKey,B extends BaseEntity.Builder<K,B>>

Method Summary

Modifier and Type	Method and Description
boolean	contains(String name) Returns true if the entity contains a property with the given name.
boolean	equals(Object obj)
Blob	getBlob(String name) Returns the property value as a blob.
boolean	getBoolean(String name) Returns the property value as a boolean.
double	getDouble(String name) Returns the property value as a double.
<K extends IncompleteKey> FullEntity<K>	getEntity(String name) Returns the property value as an entity.
K	getKey() Returns the associated key or null if it does not have one.
Key	getKey(String name) Returns the property value as a Key.
LatLng	getLatLng(String name) Returns the property value as a LatLng.
<T extends Value<?>> List<T>	getList(String name) Returns the property value as a list of values.
long	getLong(String name) Returns the property value as long.
Set<String>	getNames() Returns the properties name.
String	getString(String name) Returns the property value as a string.
Timestamp	getTimestamp(String name) Returns the property value as a Timestamp.
<V extends Value<?>> V	getValue(String name) Returns the Value for the given property name.
int	hashCode()
boolean	hasKey() Returns true if entity has a non-null key.
boolean	isNull(String name) Returns true if property is an instance of NullValue.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hasKey

public boolean hasKey()

Returns true if entity has a non-null key.

getKey

public K getKey()

Returns the associated key or null if it does not have one.

contains

public boolean contains(String name)

Returns true if the entity contains a property with the given name.

getValue

public <V extends Value<?>> V getValue(String name)

Returns the Value for the given property name.

Throws:

DatastoreException - if no such property

isNull

public boolean isNull(String name)

Returns true if property is an instance of NullValue.

Throws:

DatastoreException - if no such property

getString

public String getString(String name)

Returns the property value as a string.

Throws:

DatastoreException - if no such property

ClassCastException - if value is not a string

getLong

public long getLong(String name)

Returns the property value as long.

Throws:

DatastoreException - if no such property

ClassCastException - if value is not a long

getDouble

public double getDouble(String name)

Returns the property value as a double.

Throws:

DatastoreException - if no such property

ClassCastException - if value is not a double

getBoolean

public boolean getBoolean(String name)

Returns the property value as a boolean.

Throws:

DatastoreException - if no such property

ClassCastException - if value is not a boolean

getTimestamp

public Timestamp getTimestamp(String name)

Returns the property value as a Timestamp.

Throws:

DatastoreException - if no such property

ClassCastException - if value is not a Timestamp

getLatLng

public LatLng getLatLng(String name)

Returns the property value as a LatLng.

Throws:

DatastoreException - if no such property.

ClassCastException - if value is not a LatLng.

getKey

public Key getKey(String name)

Returns the property value as a Key.

Throws:

DatastoreException - if no such property

ClassCastException - if value is not a Key

getEntity

public <K extends IncompleteKey> FullEntity<K> getEntity(String name)

Returns the property value as an entity.

Throws:

DatastoreException - if no such property

ClassCastException - if value is not an entity

getList

public <T extends Value<?>> List<T> getList(String name)

Returns the property value as a list of values.

Throws:

DatastoreException - if no such property

ClassCastException - if value is not a list of values

getBlob

public Blob getBlob(String name)

Returns the property value as a blob.

Throws:

DatastoreException - if no such property

ClassCastException - if value is not a blob

getNames

public Set<String> getNames()

Returns the properties name.