Package javax.jdo.identity
Class ObjectIdentity
- java.lang.Object
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- javax.jdo.identity.SingleFieldIdentity
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- javax.jdo.identity.ObjectIdentity
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- All Implemented Interfaces:
java.io.Externalizable
,java.io.Serializable
,java.lang.Comparable
public class ObjectIdentity extends SingleFieldIdentity
This class is for identity with a single Object type field.- Version:
- 2.0
- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description private static JDOImplHelper
helper
The JDOImplHelper instance used for parsing the String to an Object.private static java.lang.String
STRING_DELIMITER
The delimiter for String constructor.-
Fields inherited from class javax.jdo.identity.SingleFieldIdentity
hashCode, keyAsObject, msg
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Constructor Summary
Constructors Constructor Description ObjectIdentity()
Constructor only for Externalizable.ObjectIdentity(java.lang.Class pcClass, java.lang.Object param)
Constructor with class and key.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
compareTo(java.lang.Object o)
Determine the ordering of identity objects.boolean
equals(java.lang.Object obj)
Determine if the other object represents the same object id.java.lang.Object
getKey()
Return the key.void
readExternal(java.io.ObjectInput in)
Read this object.java.lang.String
toString()
Return the String form of the object id.void
writeExternal(java.io.ObjectOutput out)
Write this object.-
Methods inherited from class javax.jdo.identity.SingleFieldIdentity
assertKeyNotNull, compare, createKeyAsObject, getKeyAsObject, getTargetClass, getTargetClassName, hashClassName, hashCode, setKeyAsObject
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Field Detail
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helper
private static JDOImplHelper helper
The JDOImplHelper instance used for parsing the String to an Object.
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STRING_DELIMITER
private static final java.lang.String STRING_DELIMITER
The delimiter for String constructor.- See Also:
- Constant Field Values
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Method Detail
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getKey
public java.lang.Object getKey()
Return the key.- Returns:
- the key
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toString
public java.lang.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 classjava.lang.Object
- Returns:
- the String form of the key
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equals
public boolean equals(java.lang.Object obj)
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
public int compareTo(java.lang.Object o)
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
public void writeExternal(java.io.ObjectOutput out) throws java.io.IOException
Write this object. Write the superclass first.- Specified by:
writeExternal
in interfacejava.io.Externalizable
- Overrides:
writeExternal
in classSingleFieldIdentity
- Parameters:
out
- the output- Throws:
java.io.IOException
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readExternal
public void readExternal(java.io.ObjectInput in) throws java.io.IOException, java.lang.ClassNotFoundException
Read this object. Read the superclass first.- Specified by:
readExternal
in interfacejava.io.Externalizable
- Overrides:
readExternal
in classSingleFieldIdentity
- Parameters:
in
- the input- Throws:
java.io.IOException
java.lang.ClassNotFoundException
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