Package com.tangosol.util

Class NullImplementation.NullObservableMap

java.lang.Object

java.util.AbstractMap

com.tangosol.util.NullImplementation.NullMap

com.tangosol.util.NullImplementation.NullObservableMap

All Implemented Interfaces:

ExternalizableLite, PortableObject, ObservableMap, Serializable, Map

Enclosing class:

NullImplementation

public static class NullImplementation.NullObservableMap
extends NullImplementation.NullMap
implements ObservableMap

An immutable ObservableMap which contains nothing.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field	Description
static final ObservableMap	INSTANCE	Since the Map contains no information, only one ever has to exist.

Constructor Summary

Constructors

Constructor	Description
NullObservableMap()	Default constructor (for ExternalizableLite and PortableObject).

Method Summary

Modifier and Type	Method	Description
void	addMapListener(MapListener listener)	Add a standard map listener that will receive all events (inserts, updates, deletes) that occur against the map, with the key, old-value and new-value included.
void	addMapListener(MapListener listener, Filter filter, boolean fLite)	Add a map listener that receives events based on a filter evaluation.
void	addMapListener(MapListener listener, Object oKey, boolean fLite)	Add a map listener for a specific key.
void	removeMapListener(MapListener listener)	Remove a standard map listener that previously signed up for all events.
void	removeMapListener(MapListener listener, Filter filter)	Remove a map listener that previously signed up for events based on a filter evaluation.
void	removeMapListener(MapListener listener, Object oKey)	Remove a map listener that previously signed up for events about a specific key.

Methods inherited from class com.tangosol.util.NullImplementation.NullMap

containsKey, containsValue, entrySet, equals, get, hashCode, keySet, put, putAll, readExternal, readExternal, remove, size, values, writeExternal, writeExternal

Methods inherited from class java.util.AbstractMap

clear, clone, isEmpty, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

clear, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, equals, forEach, get, getOrDefault, hashCode, isEmpty, keySet, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size, values

Field Details

INSTANCE

public static final ObservableMap INSTANCE

Since the Map contains no information, only one ever has to exist.

Constructor Details

NullObservableMap

public NullObservableMap()

Default constructor (for ExternalizableLite and PortableObject).

Method Details

addMapListener

public void addMapListener(MapListener listener)

Add a standard map listener that will receive all events (inserts, updates, deletes) that occur against the map, with the key, old-value and new-value included. This has the same result as the following call:

   addMapListener(listener, (Filter) null, false);
 

Specified by:

addMapListener in interface ObservableMap

Parameters:

listener - the MapEvent listener to add

removeMapListener

public void removeMapListener(MapListener listener)

Remove a standard map listener that previously signed up for all events. This has the same result as the following call:

   removeMapListener(listener, (Filter) null);
 

Specified by:

removeMapListener in interface ObservableMap

Parameters:

listener - the listener to remove

addMapListener

public void addMapListener(MapListener listener,
 Object oKey,
 boolean fLite)

Add a map listener for a specific key.

The listeners will receive MapEvent objects, but if fLite is passed as true, they might not contain the OldValue and NewValue properties.

To unregister the MapListener, use the ObservableMap.removeMapListener(MapListener, Object) method.

Specified by:

addMapListener in interface ObservableMap

Parameters:

listener - the MapEvent listener to add

oKey - the key that identifies the entry for which to raise events

fLite - true to indicate that the MapEvent objects do not have to include the OldValue and NewValue property values in order to allow optimizations

removeMapListener

public void removeMapListener(MapListener listener,
 Object oKey)

Remove a map listener that previously signed up for events about a specific key.

Specified by:

removeMapListener in interface ObservableMap

Parameters:

listener - the listener to remove

oKey - the key that identifies the entry for which to raise events

addMapListener

public void addMapListener(MapListener listener,
 Filter filter,
 boolean fLite)

Add a map listener that receives events based on a filter evaluation.

The listeners will receive MapEvent objects, but if fLite is passed as true, they might not contain the OldValue and NewValue properties.

To unregister the MapListener, use the ObservableMap.removeMapListener(MapListener, Filter) method.

Specified by:

addMapListener in interface ObservableMap

Parameters:

listener - the MapEvent listener to add

filter - a filter that will be passed MapEvent objects to select from; a MapEvent will be delivered to the listener only if the filter evaluates to true for that MapEvent (see MapEventFilter); null is equivalent to a filter that alway returns true

fLite - true to indicate that the MapEvent objects do not have to include the OldValue and NewValue property values in order to allow optimizations

removeMapListener

public void removeMapListener(MapListener listener,
 Filter filter)

Remove a map listener that previously signed up for events based on a filter evaluation.

Specified by:

removeMapListener in interface ObservableMap

Parameters:

listener - the listener to remove

filter - the filter that was passed into the corresponding addMapListener() call