Package org.biojava.utils
Class ChangeListener.AlwaysVetoListener
- java.lang.Object
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- org.biojava.utils.ChangeListener.AlwaysVetoListener
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- All Implemented Interfaces:
EventListener
,ChangeListener
- Enclosing interface:
- ChangeListener
public static class ChangeListener.AlwaysVetoListener extends Object implements ChangeListener
An implementation that always vetoes everything.- Since:
- 1.1
- Author:
- Thomas Down, Matthew Pocock
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Nested Class Summary
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Nested classes/interfaces inherited from interface org.biojava.utils.ChangeListener
ChangeListener.AlwaysVetoListener, ChangeListener.ChangeEventRecorder, ChangeListener.LoggingListener
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Field Summary
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Fields inherited from interface org.biojava.utils.ChangeListener
ALWAYS_VETO, LOG_TO_OUT
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Constructor Summary
Constructors Modifier Constructor Description protected
AlwaysVetoListener()
Private constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
postChange(ChangeEvent cev)
Called when a change has just taken place.void
preChange(ChangeEvent cev)
Called before a change takes place.
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Constructor Detail
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AlwaysVetoListener
protected AlwaysVetoListener()
Private constructor.
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Method Detail
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preChange
public void preChange(ChangeEvent cev) throws ChangeVetoException
Description copied from interface:ChangeListener
Called before a change takes place.
This is your chance to stop the change by throwing a ChangeVetoException. This method does not indicate that the change will definitely take place, so it is not recomended that you take any positive action within this handler.
- Specified by:
preChange
in interfaceChangeListener
- Parameters:
cev
- An event encapsulating the change which is about to take place.- Throws:
ChangeVetoException
- Description of Exception
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postChange
public void postChange(ChangeEvent cev)
Description copied from interface:ChangeListener
Called when a change has just taken place.
This method is the place to perform any behavior in response to the change event.
- Specified by:
postChange
in interfaceChangeListener
- Parameters:
cev
- An event encapsulating the change which has occured.- Throws:
AssertionFailure
- if this is called, as preChange should have vetoed any change already
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