Class ObjectIdentity

java.lang.Object
javax.jdo.identity.SingleFieldIdentity
javax.jdo.identity.ObjectIdentity
All Implemented Interfaces:
Externalizable, Serializable, Comparable
public class ObjectIdentity extends SingleFieldIdentity
This class is for identity with a single Object type field.
Version:
2.0
See Also:

  • Field Details

    • helper

      private static JDOImplHelper helper
      The JDOImplHelper instance used for parsing the String to an Object.

    • STRING_DELIMITER

      private static final String STRING_DELIMITER
      The delimiter for String constructor.
      See Also:

  • Constructor Details

    • ObjectIdentity

      public ObjectIdentity(Class pcClass, Object param)
      Constructor with class and key.
      Parameters:
      pcClass - the class
      param - the key

    • ObjectIdentity

      public ObjectIdentity()
      Constructor only for Externalizable.

  • Method Details

    • getKey

      public Object getKey()
      Return the key.
      Returns:
      the key

    • toString

      public String toString()
      Return the String form of the object id. The class of the object id is written as the first part of the result so that the class can be reconstructed later. Then the toString of the key instance is appended. During construction, this process is reversed. The class is extracted from the first part of the String, and the String constructor of the key is used to construct the key itself.
      Overrides:
      toString in class Object
      Returns:
      the String form of the key

    • equals

      public boolean equals(Object obj)
      Determine if the other object represents the same object id.
      Overrides:
      equals in class SingleFieldIdentity
      Parameters:
      obj - the other object
      Returns:
      true if both objects represent the same object id

    • compareTo

      public int compareTo(Object o)
      Determine the ordering of identity objects.
      Parameters:
      o - Other identity
      Returns:
      The relative ordering between the objects
      Since:
      2.2

    • writeExternal

      public void writeExternal(ObjectOutput out) throws IOException
      Write this object. Write the superclass first.
      Specified by:
      writeExternal in interface Externalizable
      Overrides:
      writeExternal in class SingleFieldIdentity
      Parameters:
      out - the output
      Throws:
      IOException

    • readExternal

      public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException
      Read this object. Read the superclass first.
      Specified by:
      readExternal in interface Externalizable
      Overrides:
      readExternal in class SingleFieldIdentity
      Parameters:
      in - the input
      Throws:
      IOException
      ClassNotFoundException