nl.knowledgeplaza.util.collection
Class ObservableSortedMap

java.lang.Object
  java.util.AbstractMap<K,V>
      java.util.TreeMap
          nl.knowledgeplaza.util.collection.ObservableSortedMap

All Implemented Interfaces:

Serializable, Cloneable, Map, SortedMap, ObservableCollection

public class ObservableSortedMap
extends TreeMap
implements ObservableCollection

The ObservableSortedMap subclasses the TreeMap and overrides all the functions that change the internally stored collection. In the overridden function, it simply calls the super class's function and fires a CollectionEvent to let observers know the collection has changed.

See Also:

Serialized Form

Field Summary

protected ArrayList

listeners the observers of this collection

Constructor Summary

ObservableSortedMap()
Constructs a new, empty map, sorted according to the keys' natural order.

ObservableSortedMap(Comparator c)
Constructs a new, empty map, sorted according to the given comparator.

ObservableSortedMap(Map m)
Constructs a new map containing the same mappings as the given map, sorted according to the keys' natural order.

ObservableSortedMap(SortedMap m)
Constructs a new map containing the same mappings as the given SortedMap, sorted according to the same ordering.

Method Summary

void	addCollectionListener(CollectionListener l) Adds a listener to this collection.
void	clear() Calls the super class's corresponding method and fires a CollectionEvent.
protected void	fireCollectionEvent(CollectionEvent e) Fires a CollectionEvent to all listeners.
Object	getObservedCollection() To access the collection that is being observed.
Object	put(Object key, Object value) Calls the super class's corresponding method and fires a CollectionEvent.
void	putAll(Map t) Calls the super class's corresponding method and fires a CollectionEvent.
Object	remove(Object key) Calls the super class's corresponding method and fires a CollectionEvent.
void	removeCollectionListener(CollectionListener l) Removes the listener from this collection.

Methods inherited from class java.util.TreeMap

clone, comparator, containsKey, containsValue, entrySet, firstKey, get, headMap, keySet, lastKey, size, subMap, tailMap, values

Methods inherited from class java.util.AbstractMap

equals, hashCode, isEmpty, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

equals, hashCode, isEmpty

Field Detail

listeners

protected ArrayList listeners

the observers of this collection

Constructor Detail

ObservableSortedMap

public ObservableSortedMap()

Constructs a new, empty map, sorted according to the keys' natural order. All keys inserted into the map must implement the Comparable interface. Furthermore, all such keys must be mutually comparable: k1.compareTo(k2) must not throw a ClassCastException for any elements k1 and k2 in the map. If the user attempts to put a key into the map that violates this constraint (for example, the user attempts to put a string key into a map whose keys are integers), the put(Object key, Object value) call will throw a ClassCastException.

ObservableSortedMap

public ObservableSortedMap(Comparator c)

Constructs a new, empty map, sorted according to the given comparator. All keys inserted into the map must be mutually comparable by the given comparator: comparator.compare(k1, k2) must not throw a ClassCastException for any keys k1 and k2 in the map. If the user attempts to put a key into the map that violates this constraint, the put(Object key, Object value) call will throw a ClassCastException.

Parameters:

c - the comparator that will be used to sort this map. A null value indicates that the keys' natural ordering should be used.

ObservableSortedMap

public ObservableSortedMap(Map m)

Constructs a new map containing the same mappings as the given map, sorted according to the keys' natural order. All keys inserted into the new map must implement the Comparable interface. Furthermore, all such keys must be mutually comparable: k1.compareTo(k2) must not throw a ClassCastException for any elements k1 and k2 in the map. This method runs in n*log(n) time.

Parameters:

m - the map whose mappings are to be placed in this map.

ObservableSortedMap

public ObservableSortedMap(SortedMap m)

Constructs a new map containing the same mappings as the given SortedMap, sorted according to the same ordering. This method runs in linear time.

Parameters:

m - the sorted map whose mappings are to be placed in this map, and whose comparator is to be used to sort this map.

Method Detail

put

public Object put(Object key,
                  Object value)

Calls the super class's corresponding method and fires a CollectionEvent.

Specified by:

put in interface Map

Overrides:

put in class TreeMap

remove

public Object remove(Object key)

Calls the super class's corresponding method and fires a CollectionEvent.

Specified by:

remove in interface Map

Overrides:

remove in class TreeMap

putAll

public void putAll(Map t)

Calls the super class's corresponding method and fires a CollectionEvent.

Specified by:

putAll in interface Map

Overrides:

putAll in class TreeMap

clear

public void clear()

Calls the super class's corresponding method and fires a CollectionEvent.

Specified by:

clear in interface Map

Overrides:

clear in class TreeMap

addCollectionListener

public void addCollectionListener(CollectionListener l)

Adds a listener to this collection.

Specified by:

addCollectionListener in interface ObservableCollection

Parameters:

l - the CollectionListener

removeCollectionListener

public void removeCollectionListener(CollectionListener l)

Removes the listener from this collection.

Specified by:

removeCollectionListener in interface ObservableCollection

Parameters:

l - the CollectionListener

fireCollectionEvent

protected void fireCollectionEvent(CollectionEvent e)

Fires a CollectionEvent to all listeners.

Parameters:

e - the CollectionEvent

getObservedCollection

public Object getObservedCollection()

To access the collection that is being observed. Unfortunately not all collections implement one interface.

Specified by:

getObservedCollection in interface ObservableCollection

Returns:

Unfortunately not all collections implement one interface, so the return type depends on the observed collection.