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java.lang.Objectjavax.jdo.identity.SingleFieldIdentity
public abstract class SingleFieldIdentity
This class is the abstract base class for all single field identity classes. A common case of application identity uses exactly one persistent field in the class to represent identity. In this case, the application can use a standard JDO class instead of creating a new user-defined class for the purpose.
Field Summary | |
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protected int |
hashCode
The hashCode. |
protected Object |
keyAsObject
The key as an Object. |
protected static I18NHelper |
msg
The Internationalization message helper. |
Constructor Summary | |
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SingleFieldIdentity()
Constructor only for Externalizable. |
protected |
SingleFieldIdentity(Class pcClass)
Constructor with target class. |
Method Summary | |
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protected void |
assertKeyNotNull(Object key)
Assert that the key is not null. |
protected int |
compare(SingleFieldIdentity o)
Determine the ordering of identity objects. |
protected Object |
createKeyAsObject()
Create the key as an Object. |
boolean |
equals(Object obj)
Check the class and class name and object type. |
Object |
getKeyAsObject()
Return the key as an Object. |
Class |
getTargetClass()
Return the target class. |
String |
getTargetClassName()
Return the target class name. |
protected int |
hashClassName()
Return the hash code of the class name. |
int |
hashCode()
Return the cached hash code. |
void |
readExternal(ObjectInput in)
Read from the input stream. |
protected void |
setKeyAsObject(Object key)
Set the given key as the key for this instance. |
void |
writeExternal(ObjectOutput out)
Write to the output stream. |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface java.lang.Comparable |
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compareTo |
Field Detail |
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protected static I18NHelper msg
protected int hashCode
protected Object keyAsObject
Constructor Detail |
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protected SingleFieldIdentity(Class pcClass)
pcClass
- the class of the targetpublic SingleFieldIdentity()
Method Detail |
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protected void setKeyAsObject(Object key)
protected void assertKeyNotNull(Object key)
public Class getTargetClass()
public String getTargetClassName()
public Object getKeyAsObject()
protected Object createKeyAsObject()
public boolean equals(Object obj)
equals
in class Object
obj
- the other object
protected int hashClassName()
public int hashCode()
hashCode
in class Object
public void writeExternal(ObjectOutput out) throws IOException
writeExternal
in interface Externalizable
out
- the stream
IOException
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException
readExternal
in interface Externalizable
IOException
ClassNotFoundException
protected int compare(SingleFieldIdentity o)
o
- Other identity
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