org.openstreetmap.josm.data.preferences

Class FallbackProperty<T>

java.lang.Object

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

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

Type Parameters:

T - The content type

public class FallbackProperty<T>
extends AbstractProperty<T>

Property that wraps another property along with a fallback property that is used as default value.

Since:

12987

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 AbstractProperty<T>	fallback
private AbstractProperty<T>	property

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

defaultValue, key, preferences

Constructor Summary

Constructors

Constructor and Description
FallbackProperty(AbstractProperty<T> property, AbstractProperty<T> fallback) Constructs a new FallbackProperty.

Method Summary

Modifier and Type	Method and Description
protected void	addListenerImpl(PreferenceChangedListener adapter)
void	addWeakListener(AbstractProperty.ValueChangeListener<? super T> listener) Adds a weak listener that listens only for changes to this preference key.
T	get() Replies the value of this property.
T	getDefaultValue() Replies the default value of this property.
AbstractProperty<T>	getDelegateProperty() Get the wrapped property.
AbstractProperty<T>	getFallbackProperty() Get the fallback property.
boolean	isSet() Determines if this property is currently set in JOSM preferences.
boolean	put(T value) Sets this property to the specified value.
void	remove() Removes this property from JOSM preferences (i.e replace it by its default value).
protected void	removeListenerImpl(PreferenceChangedListener adapter)
protected void	storeDefaultValue() Store the default value to the preferences.

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

addListener, cached, equals, getKey, getPreferences, hashCode, removeListener

Methods inherited from class java.lang.Object

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

Field Detail

property

private final AbstractProperty<T> property

fallback

private final AbstractProperty<T> fallback

Constructor Detail

FallbackProperty

public FallbackProperty(AbstractProperty<T> property,
                        AbstractProperty<T> fallback)

Constructs a new FallbackProperty.

Parameters:

property - the wrapped property

fallback - fallback property that takes effect in the get() method when property is not set

Method Detail

getDelegateProperty

public AbstractProperty<T> getDelegateProperty()

Get the wrapped property.

Returns:

the wrapped property

getFallbackProperty

public AbstractProperty<T> getFallbackProperty()

Get the fallback property.

Returns:

the fallback property

storeDefaultValue

protected void storeDefaultValue()

Description copied from class: AbstractProperty

Store the default value to the preferences.

Overrides:

storeDefaultValue in class AbstractProperty<T>

isSet

public boolean isSet()

Description copied from class: AbstractProperty

Determines if this property is currently set in JOSM preferences.

Overrides:

isSet in class AbstractProperty<T>

Returns:

true if getPreferences() contains this property.

getDefaultValue

public T getDefaultValue()

Description copied from class: AbstractProperty

Replies the default value of this property.

Overrides:

getDefaultValue in class AbstractProperty<T>

Returns:

The default value of this property

remove

public void remove()

Description copied from class: AbstractProperty

Removes this property from JOSM preferences (i.e replace it by its default value).

Overrides:

remove in class AbstractProperty<T>

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)

addListenerImpl

protected void addListenerImpl(PreferenceChangedListener adapter)

Overrides:

addListenerImpl in class AbstractProperty<T>

addWeakListener

public void addWeakListener(AbstractProperty.ValueChangeListener<? super T> listener)

Description copied from class: AbstractProperty

Adds a weak listener that listens only for changes to this preference key.

Overrides:

addWeakListener in class AbstractProperty<T>

Parameters:

listener - The listener to add.

removeListenerImpl

protected void removeListenerImpl(PreferenceChangedListener adapter)

Overrides:

removeListenerImpl in class AbstractProperty<T>