Package javax.jdo.identity
Class ObjectIdentity
java.lang.Object
javax.jdo.identity.SingleFieldIdentity
javax.jdo.identity.ObjectIdentity
- All Implemented Interfaces:
Externalizable
,Serializable
,Comparable
This class is for identity with a single Object type field.
- Version:
- 2.0
- See Also:
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate static JDOImplHelper
The JDOImplHelper instance used for parsing the String to an Object.private static final String
The delimiter for String constructor.Fields inherited from class javax.jdo.identity.SingleFieldIdentity
hashCode, keyAsObject, msg
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Constructor Summary
ConstructorsConstructorDescriptionConstructor only for Externalizable.ObjectIdentity
(Class pcClass, Object param) Constructor with class and key. -
Method Summary
Methods inherited from class javax.jdo.identity.SingleFieldIdentity
assertKeyNotNull, compare, createKeyAsObject, getKeyAsObject, getTargetClass, getTargetClassName, hashClassName, hashCode, setKeyAsObject
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Field Details
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helper
The JDOImplHelper instance used for parsing the String to an Object. -
STRING_DELIMITER
The delimiter for String constructor.- See Also:
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Constructor Details
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ObjectIdentity
Constructor with class and key.- Parameters:
pcClass
- the classparam
- the key
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ObjectIdentity
public ObjectIdentity()Constructor only for Externalizable.
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Method Details
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getKey
Return the key.- Returns:
- the key
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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. -
equals
Determine if the other object represents the same object id.- Overrides:
equals
in classSingleFieldIdentity
- Parameters:
obj
- the other object- Returns:
- true if both objects represent the same object id
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compareTo
Determine the ordering of identity objects.- Parameters:
o
- Other identity- Returns:
- The relative ordering between the objects
- Since:
- 2.2
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writeExternal
Write this object. Write the superclass first.- Specified by:
writeExternal
in interfaceExternalizable
- Overrides:
writeExternal
in classSingleFieldIdentity
- Parameters:
out
- the output- Throws:
IOException
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readExternal
Read this object. Read the superclass first.- Specified by:
readExternal
in interfaceExternalizable
- Overrides:
readExternal
in classSingleFieldIdentity
- Parameters:
in
- the input- Throws:
IOException
ClassNotFoundException
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