java.lang.Object
javafx.beans.binding.MapExpression<K,V>
- Type Parameters:
K
- the type of the key elementsV
- the type of the value elements
- All Implemented Interfaces:
Map<K,
,V> Observable
,ObservableMapValue<K,
,V> ObservableObjectValue<ObservableMap<K,
,V>> ObservableValue<ObservableMap<K,
,V>> ObservableMap<K,
V>
- Direct Known Subclasses:
MapBinding
,ReadOnlyMapProperty
MapExpression
is an
ObservableMapValue
plus additional convenience
methods to generate bindings in a fluent style.
A concrete sub-class of MapExpression
has to implement the method
ObservableObjectValue.get()
, which provides the
actual value of this expression.
If the wrapped list of a MapExpression
is null
, all methods implementing the Map
interface will behave as if they were applied to an immutable empty list.
- Since:
- JavaFX 2.1
-
Property Summary
TypePropertyDescriptionabstract ReadOnlyBooleanProperty
A boolean property that istrue
, if the map is empty.abstract ReadOnlyIntegerProperty
An integer property that represents the size of the map. -
Nested Class Summary
-
Constructor Summary
-
Method Summary
Modifier and TypeMethodDescriptionasString()
void
clear()
boolean
containsKey
(Object obj) boolean
containsValue
(Object obj) abstract ReadOnlyBooleanProperty
A boolean property that istrue
, if the map is empty.entrySet()
int
getSize()
The size of the mapgetValue()
Returns the current value of thisObservableValue
boolean
isEmpty()
Gets the value of theempty
property.isEqualTo
(ObservableMap<?, ?> other) isNotEqualTo
(ObservableMap<?, ?> other) isNull()
keySet()
static <K,
V> MapExpression <K, V> mapExpression
(ObservableMapValue<K, V> value) Returns aMapExpression
that wraps aObservableMapValue
.void
int
size()
abstract ReadOnlyIntegerProperty
An integer property that represents the size of the map.valueAt
(ObservableValue<K> key) Creates a newObjectBinding
that contains the mapping of the specified key.Creates a newObjectBinding
that contains the mapping of the specified key.values()
Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods declared in interface java.util.Map
compute, computeIfAbsent, computeIfPresent, equals, forEach, getOrDefault, hashCode, merge, putIfAbsent, remove, replace, replace, replaceAll
Methods declared in interface javafx.beans.Observable
addListener, removeListener, subscribe
Methods declared in interface javafx.collections.ObservableMap
addListener, removeListener
Methods declared in interface javafx.beans.value.ObservableObjectValue
get
Methods declared in interface javafx.beans.value.ObservableValue
addListener, flatMap, map, orElse, removeListener, subscribe, subscribe, when
-
Property Details
-
size
An integer property that represents the size of the map.- See Also:
-
empty
A boolean property that istrue
, if the map is empty.- See Also:
-
-
Constructor Details
-
MapExpression
public MapExpression()Creates a defaultMapExpression
.
-
-
Method Details
-
getValue
Description copied from interface:ObservableValue
Returns the current value of thisObservableValue
- Specified by:
getValue
in interfaceObservableValue<K>
- Returns:
- The current value
-
mapExpression
Returns aMapExpression
that wraps aObservableMapValue
. If theObservableMapValue
is already aMapExpression
, it will be returned. Otherwise a newMapBinding
is created that is bound to theObservableMapValue
.- Type Parameters:
K
- the type of the key elementsV
- the type of the value elements- Parameters:
value
- The sourceObservableMapValue
- Returns:
- A
MapExpression
that wraps theObservableMapValue
if necessary - Throws:
NullPointerException
- ifvalue
isnull
-
getSize
public int getSize()The size of the map- Returns:
- the size
-
sizeProperty
An integer property that represents the size of the map.- Returns:
- the property
- See Also:
-
emptyProperty
A boolean property that istrue
, if the map is empty.- Returns:
- the
ReadOnlyBooleanProperty
- See Also:
-
valueAt
Creates a newObjectBinding
that contains the mapping of the specified key.- Parameters:
key
- the key of the mapping- Returns:
- the
ObjectBinding
-
valueAt
Creates a newObjectBinding
that contains the mapping of the specified key.- Parameters:
key
- the key of the mapping- Returns:
- the
ObjectBinding
- Throws:
NullPointerException
- ifkey
isnull
-
isEqualTo
- Parameters:
other
- the otherObservableMap
- Returns:
- the new
BooleanBinding
- Throws:
NullPointerException
- ifother
isnull
-
isNotEqualTo
- Parameters:
other
- the otherObservableMap
- Returns:
- the new
BooleanBinding
- Throws:
NullPointerException
- ifother
isnull
-
isNull
- Returns:
- the new
BooleanBinding
-
isNotNull
- Returns:
- the new
BooleanBinding
-
asString
Creates aStringBinding
that holds the value of theMapExpression
turned into aString
. If the value of thisMapExpression
changes, the value of theStringBinding
will be updated automatically.- Returns:
- the new
StringBinding
-
size
public int size() -
isEmpty
public boolean isEmpty()Gets the value of theempty
property. -
containsKey
- Specified by:
containsKey
in interfaceMap<K,
V>
-
containsValue
- Specified by:
containsValue
in interfaceMap<K,
V>
-
put
-
remove
-
putAll
-
clear
public void clear() -
keySet
-
values
-
entrySet
-
get
-