org.datanucleus.identity

Class ObjectId

java.lang.Object

org.datanucleus.identity.SingleFieldId

org.datanucleus.identity.ObjectId

All Implemented Interfaces:

Externalizable, Serializable, Comparable

public class ObjectId
extends SingleFieldId

This class is for identity with a single Object type field.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.datanucleus.identity.SingleFieldId

hashCode, STRING_DELIMITER, targetClassName

Constructor Summary

Constructors

Constructor and Description
ObjectId()
ObjectId(Class pcClass, Object param) Constructor with class and key.

Method Summary

Modifier and Type	Method and Description
int	compareTo(Object o)
boolean	equals(Object obj) Check the class and class name and object type.
Object	getKey()
Object	getKeyAsObject()
void	readExternal(ObjectInput in) Read this object.
String	toString() Return the String form of the object id.
void	writeExternal(ObjectOutput out) Write this object.

Methods inherited from class org.datanucleus.identity.SingleFieldId

assertKeyNotNull, compare, getTargetClassName, hashCode

Methods inherited from class java.lang.Object

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

Constructor Detail

ObjectId

public ObjectId(Class pcClass,
                Object param)

Constructor with class and key.

Parameters:

pcClass - the class

param - the key

ObjectId

public ObjectId()

Method Detail

getKey

public Object getKey()

getKeyAsObject

public Object getKeyAsObject()

Specified by:

getKeyAsObject in class SingleFieldId

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)

Description copied from class: SingleFieldId

Check the class and class name and object type.

Overrides:

equals in class SingleFieldId

Parameters:

obj - the other object

Returns:

true if the class name is the same

compareTo

public int compareTo(Object o)

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 SingleFieldId

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 SingleFieldId

Parameters:

in - the input

Throws:

IOException

ClassNotFoundException