org.jminor.common

Interface ValueObserver<V>

Type Parameters:

V - the type of the value

All Superinterfaces:

EventObserver<V>

All Known Subinterfaces:

PropertyValue<T>, StringValue<V>, Value<V>

All Known Implementing Classes:

Values.AbstractObservableValue, Values.AbstractValue

public interface ValueObserver<V>
extends EventObserver<V>

A read only value observer

Method Summary

Modifier and Type	Method and Description
default void	addDataListener(EventDataListener<V> listener) Adds a listener notified with the new value each time the value being observed changes
default void	addListener(EventListener listener) Adds a listener notified each time the value being observed changes
V	get()
EventObserver<V>	getChangeObserver() Returns an observer notified each time this value changes, may not return null.
boolean	isNullable() If false then get() is guaranteed to never return null.
default void	removeDataListener(EventDataListener listener) Removes listener from this EventObserver
default void	removeListener(EventListener listener) Removes listener from this EventObserver

Method Detail

get

V get()

Returns:

the value

isNullable

boolean isNullable()

If false then get() is guaranteed to never return null.

Returns:

true if this value can be null

getChangeObserver

EventObserver<V> getChangeObserver()

Returns an observer notified each time this value changes, may not return null.

Returns:

an observer notified each time the value changes

addListener

default void addListener(EventListener listener)

Adds a listener notified each time the value being observed changes

Specified by:

addListener in interface EventObserver<V>

Parameters:

listener - the listener to add

removeListener

default void removeListener(EventListener listener)

Removes listener from this EventObserver

Specified by:

removeListener in interface EventObserver<V>

Parameters:

listener - the listener to remove

addDataListener

default void addDataListener(EventDataListener<V> listener)

Adds a listener notified with the new value each time the value being observed changes

Specified by:

addDataListener in interface EventObserver<V>

Parameters:

listener - the listener to add

removeDataListener

default void removeDataListener(EventDataListener listener)

Removes listener from this EventObserver

Specified by:

removeDataListener in interface EventObserver<V>

Parameters:

listener - the listener to remove