Package org.biojava.utils
Class ChangeListener.LoggingListener
java.lang.Object
org.biojava.utils.ChangeListener.LoggingListener
- All Implemented Interfaces:
EventListener
,ChangeListener
- Enclosing interface:
ChangeListener
A listener that writes information about the event stream to a PrintStream.
- Since:
- 1.1
- Author:
- Matthew Pocock
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Nested Class Summary
Nested classes/interfaces inherited from interface org.biojava.utils.ChangeListener
ChangeListener.AlwaysVetoListener, ChangeListener.ChangeEventRecorder, ChangeListener.LoggingListener
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Field Summary
Fields inherited from interface org.biojava.utils.ChangeListener
ALWAYS_VETO, LOG_TO_OUT
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Constructor Summary
ConstructorsConstructorDescriptionCreate a LoggingListener that will log all events to 'out'.LoggingListener
(PrintStream out, String prefix) Create a LoggingListener that will log all events to 'out' with a prefix. -
Method Summary
Modifier and TypeMethodDescriptionvoid
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 Details
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LoggingListener
Create a LoggingListener that will log all events to 'out'.- Parameters:
out
- the PrintStream to log events to
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LoggingListener
Create a LoggingListener that will log all events to 'out' with a prefix.- Parameters:
out
- the PrintStream to log events toprefix
- the prefix to attach to each line of the log
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Method Details
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preChange
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 ExceptionChangeVetoException
- if the receiver does not wish this change to occur at this time.
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postChange
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.
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