EmbeddedEntity (Google App Engine API for Java)

com.google.appengine.api.datastore

Class EmbeddedEntity

• java.lang.Object
• • com.google.appengine.api.datastore.PropertyContainer
  • • com.google.appengine.api.datastore.EmbeddedEntity

• All Implemented Interfaces:

  java.io.Serializable, java.lang.Cloneable

  ---

  
  

  public final class EmbeddedEntity
  extends PropertyContainer

  A property value containing embedded entity properties (and optionally a Key).

  This class is similar to Entity, but differs in the following ways:

  • equals(Object) and hashCode() compare the embedded properties in addition to the Key.
  • It is not queryable when stored in the datastore.
  • A Key is optional.
  • Keys without a name or id are considered equal if all other aspects of the keys are equal (as they will not be assigned IDs by the datastore when embedded).

  To convert from an Entity use:

  
   EmbeddedEntity sv = new EmbeddedEntity();
   sv.setKey(entity.getKey())
   sv.setPropertiesFrom(entity)
   

  To convert to an Entity use:

  
   Entity entity = new Entity(sv.getKey())
   entity.setPropertiesFrom(sv);
   

  See Also:

  Serialized Form

• • Constructor Summary

    Constructors 

    Constructor and Description
    EmbeddedEntity()

  • Method Summary

    All Methods Instance Methods Concrete Methods 

    Modifier and Type	Method and Description
    EmbeddedEntity	clone()
    boolean	equals(java.lang.Object obj)
    Key	getKey()
    int	hashCode()
    void	setKey(Key key)
    java.lang.String	toString()

    • Methods inherited from class com.google.appengine.api.datastore.PropertyContainer

      getProperties, getProperty, hasProperty, isUnindexedProperty, removeProperty, setIndexedProperty, setPropertiesFrom, setProperty, setUnindexedProperty

    • Methods inherited from class java.lang.Object

      getClass, notify, notifyAll, wait, wait, wait

• • Constructor Detail

    • EmbeddedEntity

      public EmbeddedEntity()

  • Method Detail

    • getKey

      public Key getKey()

      Returns:

      the key or null.

    • setKey

      public void setKey(Key key)

      Parameters:

      key - the key to set

    • clone

      public EmbeddedEntity clone()

    • toString

      public java.lang.String toString()

      Overrides:

      toString in class java.lang.Object

    • hashCode

      public int hashCode()

      Overrides:

      hashCode in class java.lang.Object

    • equals

      public boolean equals(java.lang.Object obj)

      Overrides:

      equals in class java.lang.Object