Module com.aoapps.lang

Package com.aoapps.lang.attribute

Class Attribute.OldValue

java.lang.Object

com.aoapps.lang.attribute.Attribute.OldValue

All Implemented Interfaces:

AutoCloseable

Enclosing class:

Attribute<C,T>

public abstract static class Attribute.OldValue
extends Object
implements AutoCloseable

A backup value from before attribute initialization, which must be closed to restore the old value. This is best used in try-with-resources.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	OldValue(Object oldValue)

Method Summary

Modifier and Type	Method	Description
abstract void	close()	Restores the old value of the attribute.
Object	getOldValue()	Gets the old value of the attribute, which will be restored on close().

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

OldValue

protected OldValue(Object oldValue)

Method Details

getOldValue

public Object getOldValue()

Gets the old value of the attribute, which will be restored on close(). This can be of any type, since this is used to backup arbitrary values before new scopes.

Returns:

the old attribute value or null when none

close

public abstract void close()

Restores the old value of the attribute.

Specified by:

close in interface AutoCloseable