org.openstreetmap.josm.data.preferences

Class CachingProperty<T>

java.lang.Object

org.openstreetmap.josm.data.preferences.AbstractProperty<T>

org.openstreetmap.josm.data.preferences.CachingProperty<T>

Type Parameters:

T - property type

All Implemented Interfaces:

AbstractProperty.ValueChangeListener<T>

public class CachingProperty<T>
extends AbstractProperty<T>
implements AbstractProperty.ValueChangeListener<T>

This is a special wrapper of AbstractProperty. The current preference value is cached. The value is invalidated if the preference was changed.

Since:

10824

Nested Class Summary

Nested classes/interfaces inherited from class org.openstreetmap.josm.data.preferences.AbstractProperty

AbstractProperty.InvalidPreferenceValueException, AbstractProperty.ValueChangeEvent<T>, AbstractProperty.ValueChangeListener<T>

Field Summary

Fields

Modifier and Type	Field and Description
private T	cache
private boolean	cacheValid
private AbstractProperty<T>	toCache

Fields inherited from class org.openstreetmap.josm.data.preferences.AbstractProperty

defaultValue, key, preferences

Constructor Summary

Constructors

Constructor and Description
CachingProperty(AbstractProperty<T> toCache) Create a new caching property.

Method Summary

Modifier and Type	Method and Description
T	get() Replies the value of this property.
boolean	put(T value) Sets this property to the specified value.
void	valueChanged(AbstractProperty.ValueChangeEvent<? extends T> e) Method called when a property value has changed.

Methods inherited from class org.openstreetmap.josm.data.preferences.AbstractProperty

addListener, addListenerImpl, addWeakListener, cached, equals, getDefaultValue, getKey, getPreferences, hashCode, isSet, remove, removeListener, removeListenerImpl, storeDefaultValue

Methods inherited from class java.lang.Object

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

Field Detail

cache

private T cache

cacheValid

private boolean cacheValid

toCache

private final AbstractProperty<T> toCache

Constructor Detail

CachingProperty

CachingProperty(AbstractProperty<T> toCache)

Create a new caching property.

Parameters:

toCache - The property to cache.

Method Detail

get

public T get()

Description copied from class: AbstractProperty

Replies the value of this property.

Specified by:

get in class AbstractProperty<T>

Returns:

the value of this property

put

public boolean put(T value)

Description copied from class: AbstractProperty

Sets this property to the specified value.

Specified by:

put in class AbstractProperty<T>

Parameters:

value - The new value of this property

Returns:

true if something has changed (i.e. value is different than before)

valueChanged

public void valueChanged(AbstractProperty.ValueChangeEvent<? extends T> e)

Description copied from interface: AbstractProperty.ValueChangeListener

Method called when a property value has changed.

Specified by:

valueChanged in interface AbstractProperty.ValueChangeListener<T>

Parameters:

e - property change event