com.neurosys.events

Class ChangeListenerWrapperTransformer<T>

java.lang.Object

com.neurosys.events.ChangeListenerWrapperTransformer<T>

Type Parameters:

T - as event/change type TODO: Add Unit test case

All Implemented Interfaces:

ChangeListener<T>, ChangeListenerTransfomer<T>, Serializable, EventListener, org.apache.commons.collections.Transformer

Direct Known Subclasses:

FlowStatusChangeListenerWrapperTransformer

public class ChangeListenerWrapperTransformer<T>
extends Object
implements ChangeListenerTransfomer<T>

A ChangeListener that can wrap any Transformer

Author:

Arjun Dhar

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected org.apache.commons.collections.Predicate	predicate An optional Predicate that can filter events before they reach the transformer. If null then no filteration will apply.
protected org.apache.commons.collections.Transformer	transformer On predicateed event, call this for action

Constructor Summary

Constructors

Constructor and Description
ChangeListenerWrapperTransformer()
ChangeListenerWrapperTransformer(org.apache.commons.collections.Transformer t)

Method Summary

Modifier and Type	Method and Description
org.apache.commons.collections.Predicate	getPredicate() An optional Predicate that can filter events before they reach the transformer. If null then no filteration will apply.
org.apache.commons.collections.Transformer	getTransformer() On predicateed event, call this for action
void	onChange(ChangeGenerator<T> changeGenerator, T modelObject)
void	setPredicate(org.apache.commons.collections.Predicate predicate) An optional Predicate that can filter events before they reach the transformer. If null then no filteration will apply.
void	setTransformer(org.apache.commons.collections.Transformer transformer) On predicateed event, call this for action
Object	transform(Object input)

Methods inherited from class java.lang.Object

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

Field Detail

transformer

protected org.apache.commons.collections.Transformer transformer

On predicateed event, call this for action

Can be null:

false

predicate

protected org.apache.commons.collections.Predicate predicate

An optional Predicate that can filter events before they reach the transformer.
If null then no filteration will apply. If Predicate.evaluate(Object) = false then the event will be filtered hence will NOT reach the transformer
The filter acts on the input which will be passed to the Transformer.

Can be null:

true

Constructor Detail

ChangeListenerWrapperTransformer

public ChangeListenerWrapperTransformer()

ChangeListenerWrapperTransformer

public ChangeListenerWrapperTransformer(org.apache.commons.collections.Transformer t)

Method Detail

onChange

public void onChange(ChangeGenerator<T> changeGenerator,
                     T modelObject)

Specified by:

onChange in interface ChangeListener<T>

Parameters:

changeGenerator - as the generator that caused the change. Specially useful if the Listener is subscribing to multiple ChangeGenerators

modelObject - as the model change communicated

transform

public Object transform(Object input)

Specified by:

transform in interface org.apache.commons.collections.Transformer

getTransformer

public org.apache.commons.collections.Transformer getTransformer()

On predicateed event, call this for action

Can be null:

false

setTransformer

public void setTransformer(org.apache.commons.collections.Transformer transformer)

On predicateed event, call this for action

Can be null:

false

getPredicate

public org.apache.commons.collections.Predicate getPredicate()

An optional Predicate that can filter events before they reach the transformer.
If null then no filteration will apply. If Predicate.evaluate(Object) = false then the event will be filtered hence will NOT reach the transformer
The filter acts on the input which will be passed to the Transformer.

Can be null:

true

setPredicate

public void setPredicate(org.apache.commons.collections.Predicate predicate)

An optional Predicate that can filter events before they reach the transformer.
If null then no filteration will apply. If Predicate.evaluate(Object) = false then the event will be filtered hence will NOT reach the transformer
The filter acts on the input which will be passed to the Transformer.

Can be null:

true