java.lang.Object
- java.util.AbstractMap<K,V>
- - org.eclipse.core.databinding.observable.map.AbstractObservableMap<K,V>
  - - org.eclipse.core.databinding.observable.map.ComputedObservableMap<K,V>

Type Parameters:

K - type of the keys to the map

V - type of the values in the map

All Implemented Interfaces:

java.util.Map<K,V>, IObservable, IObservableMap<K,V>
```
public abstract class ComputedObservableMap<K,V>
extends AbstractObservableMap<K,V>
```
Maps objects to one of their attributes. Tracks changes to the underlying observable set of objects (keys), as well as changes to attribute values.

Nested Class Summary
- Nested classes/interfaces inherited from class java.util.AbstractMap
  java.util.AbstractMap.SimpleEntry<K extends java.lang.Object,V extends java.lang.Object>, java.util.AbstractMap.SimpleImmutableEntry<K extends java.lang.Object,V extends java.lang.Object>
- Nested classes/interfaces inherited from interface java.util.Map
  java.util.Map.Entry<K extends java.lang.Object,V extends java.lang.Object>

Constructor Summary

Constructors
Constructor	Description
`ComputedObservableMap(IObservableSet<K> keySet)`
`ComputedObservableMap(IObservableSet<K> keySet, java.lang.Object valueType)`

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`boolean`	`containsKey(java.lang.Object key)`
`void`	`dispose()`	Disposes of this observable object, removing all listeners registered with this object, and all listeners this object might have registered on other objects.
`protected abstract V`	`doGet(K key)`
`protected abstract V`	`doPut(K key, V value)`
`java.util.Set<java.util.Map.Entry<K,V>>`	`entrySet()`
`protected void`	`fireSingleChange(K key, V oldValue, V newValue)`
`protected void`	`firstListenerAdded()`
`V`	`get(java.lang.Object key)`
`java.lang.Object`	`getKeyType()`	Returns the element type for the `keyset` of this observable map, or `null` if the keyset is untyped.
`java.lang.Object`	`getValueType()`	Returns the element type for the `values` of this observable map, or `null` if the values collection is untyped.
`protected abstract void`	`hookListener(K addedKey)`
`protected void`	`init()`	Deprecated. Subclasses are no longer required to call this method.
`boolean`	`isStale()`	Returns whether the state of this observable is stale and is expected to change soon.
`java.util.Set<K>`	`keySet()`
`protected void`	`lastListenerRemoved()`
`V`	`put(K key, V value)`
`V`	`remove(java.lang.Object key)`
`protected abstract void`	`unhookListener(K removedKey)`

Methods inherited from class org.eclipse.core.databinding.observable.map.AbstractObservableMap
addChangeListener, addDisposeListener, addMapChangeListener, addStaleListener, checkRealm, fireChange, fireMapChange, fireStale, getRealm, hasListeners, isDisposed, removeChangeListener, removeDisposeListener, removeMapChangeListener, removeStaleListener, setStale

Methods inherited from class java.util.AbstractMap
clear, clone, containsValue, equals, hashCode, isEmpty, putAll, size, toString, values

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.eclipse.core.databinding.observable.map.IObservableMap
containsValue, equals, hashCode, isEmpty, size, values

Methods inherited from interface java.util.Map
clear, compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putAll, putIfAbsent, remove, replace, replace, replaceAll

- Constructor Detail
  - ComputedObservableMap
```
public ComputedObservableMap(IObservableSet<K> keySet)
```
    Parameters:
    
    keySet - the key set
  - ComputedObservableMap
```
public ComputedObservableMap(IObservableSet<K> keySet,
                             java.lang.Object valueType)
```
    Parameters:
    
    keySet - the key set
    
    valueType - the value type
    
    Since:
    
    1.2
- Method Detail
  - init
```
@Deprecated
protected void init()
```
    Deprecated.
    Subclasses are no longer required to call this method.
  - firstListenerAdded
```
protected void firstListenerAdded()
```
    Overrides:
    
    firstListenerAdded in class AbstractObservableMap<K,V>
  - lastListenerRemoved
```
protected void lastListenerRemoved()
```
    Overrides:
    
    lastListenerRemoved in class AbstractObservableMap<K,V>
  - fireSingleChange
```
protected final void fireSingleChange(K key,
                                      V oldValue,
                                      V newValue)
```
  - getKeyType
```
public java.lang.Object getKeyType()
```
    Description copied from interface: IObservableMap
    
    Returns the element type for the keyset of this observable map, or null if the keyset is untyped.
    
    Specified by:
    
    getKeyType in interface IObservableMap<K,V>
    
    Overrides:
    
    getKeyType in class AbstractObservableMap<K,V>
    
    Returns:
    
    the element type for the keyset of this observable map, or null if the keyset is untyped.
    
    Since:
    
    1.2
  - getValueType
```
public java.lang.Object getValueType()
```
    Description copied from interface: IObservableMap
    
    Returns the element type for the values of this observable map, or null if the values collection is untyped.
    
    Specified by:
    
    getValueType in interface IObservableMap<K,V>
    
    Overrides:
    
    getValueType in class AbstractObservableMap<K,V>
    
    Returns:
    
    the element type for the values of this observable map, or null if the values collection is untyped.
    
    Since:
    
    1.2
  - remove
```
public V remove(java.lang.Object key)
```
    Specified by:
    
    remove in interface IObservableMap<K,V>
    
    Specified by:
    
    remove in interface java.util.Map<K,V>
    
    Overrides:
    
    remove in class java.util.AbstractMap<K,V>
    
    Since:
    
    1.3
  - containsKey
```
public boolean containsKey(java.lang.Object key)
```
    Specified by:
    
    containsKey in interface IObservableMap<K,V>
    
    Specified by:
    
    containsKey in interface java.util.Map<K,V>
    
    Overrides:
    
    containsKey in class java.util.AbstractMap<K,V>
    
    Since:
    
    1.3
  - entrySet
```
public java.util.Set<java.util.Map.Entry<K,V>> entrySet()
```
    Specified by:
    
    entrySet in interface IObservableMap<K,V>
    
    Specified by:
    
    entrySet in interface java.util.Map<K,V>
    
    Specified by:
    
    entrySet in class java.util.AbstractMap<K,V>
  - keySet
```
public java.util.Set<K> keySet()
```
    Specified by:
    
    keySet in interface IObservableMap<K,V>
    
    Specified by:
    
    keySet in interface java.util.Map<K,V>
    
    Overrides:
    
    keySet in class java.util.AbstractMap<K,V>
  - get
```
public final V get(java.lang.Object key)
```
    Specified by:
    
    get in interface IObservableMap<K,V>
    
    Specified by:
    
    get in interface java.util.Map<K,V>
    
    Overrides:
    
    get in class java.util.AbstractMap<K,V>
  - put
```
public final V put(K key,
                   V value)
```
    Specified by:
    
    put in interface IObservableMap<K,V>
    
    Specified by:
    
    put in interface java.util.Map<K,V>
    
    Overrides:
    
    put in class java.util.AbstractMap<K,V>
  - unhookListener
```
protected abstract void unhookListener(K removedKey)
```
    Parameters:
    
    removedKey - element to remove listener from
  - hookListener
```
protected abstract void hookListener(K addedKey)
```
    Parameters:
    
    addedKey - element to add listener to
  - doGet
```
protected abstract V doGet(K key)
```
    Parameters:
    
    key - the key
    
    Returns:
    
    the value for the given key
  - doPut
```
protected abstract V doPut(K key,
                           V value)
```
    Parameters:
    
    key - the key
    
    value - key's new value
    
    Returns:
    
    the old value for the given key
  - isStale
```
public boolean isStale()
```
    Description copied from interface: IObservable
    
    Returns whether the state of this observable is stale and is expected to change soon. A non-stale observable that becomes stale will notify its stale listeners. A stale object that becomes non-stale does so by changing its state and notifying its change listeners, it does not notify its stale listeners about becoming non-stale. Clients that do not expect asynchronous changes may ignore staleness of observable objects.
    
    Specified by:
    
    isStale in interface IObservable
    
    Overrides:
    
    isStale in class AbstractObservableMap<K,V>
    
    Returns:
    
    true if this observable's state is stale and will change soon.
  - dispose
```
public void dispose()
```
    Description copied from interface: IObservable
    
    Disposes of this observable object, removing all listeners registered with this object, and all listeners this object might have registered on other objects.
    
    Specified by:
    
    dispose in interface IObservable
    
    Overrides:
    
    dispose in class AbstractObservableMap<K,V>

Class ComputedObservableMap<K,​V>

Nested Class Summary

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

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

Constructor Summary

Method Summary

Methods inherited from class org.eclipse.core.databinding.observable.map.AbstractObservableMap

Methods inherited from class java.util.AbstractMap

Methods inherited from class java.lang.Object

Methods inherited from interface org.eclipse.core.databinding.observable.map.IObservableMap

Methods inherited from interface java.util.Map

Constructor Detail

ComputedObservableMap

ComputedObservableMap

Method Detail

init

firstListenerAdded

lastListenerRemoved

fireSingleChange

getKeyType

getValueType

remove

containsKey

entrySet

keySet

get

put

unhookListener

hookListener

doGet

doPut

isStale

dispose

Class ComputedObservableMap<K,V>