JarCastingJava Observable Properties
This project contains properties which are able to notify registered listeners about changes.
Usage
Insert dependency into your maven pom.xml:
<dependency>
<groupId>de.borisskert</groupId>
<artifactId>java-observable-properties</artifactId>
<version>0.1.0-17</version>
</dependency>
Simple object properties
Simple properties are forced to contain a value. For optional values consider to use an OptionalProperty instance.
Generic object property
Instance creation
Property<Object> property = new SimpleObjectProperty<>(new Object());
Retrieve the value
Object object = property.get();
Update the value
property.set(new Object());
Register a listener
"Classical style"
public class MyChangeListener implements ChangeListener<Object> {
@Override
public void onChange(ReadonlyProperty<Object> property, Object oldValue, Object newValue) {
// property: the property instance which is currently notifying this listener
// oldValue: the value before this change occurred
// newValue: the new value
}
}
ChangeListener<Object> listener = new MyChangeListener();
property.addListener(listener);
Anonymous class
property.addListener(new ChangeListener<TestObject>() {
@Override
public void onChange(ReadonlyProperty<TestObject> property, TestObject oldValue, TestObject newValue) {
// property: the property instance which is currently notifying this listener
// oldValue: the value before this change occurred
// newValue: the new value
}
});
Lambda style
property.addListener((property, oldValue, newValue) -> {
// property: the property instance which is currently notifying this listener
// oldValue: the value before this change occurred
// newValue: the new value
});
Unregister a listener
property.removeListener(listener);
Bind a Property
property.bind(anotherProperty);
Unbind a Property
property.unbind(boundProperty);
Typed properties
String
Property<String> property = new StringProperty<>("your property value");
Integer
Property<Integer> property = new IntegerProperty<>(123);
Double
Property<Double> property = new DoubleProperty<>(1.23);
Boolean
Property<Boolean> property = new BooleanProperty<>(true);
Long
Property<Long> property = new LongProperty<>(123L);
Float
Property<Float> property = new FloatProperty<>(1.23f);
Short
short myShort = 123;
Property<Short> property = new ShortProperty<>(myShort);
Optional properties
Optional properties are able to be empty. Technically they contain a null value.
Generic optional property
Instance creation
OptionalProperty<Object> property = new SimpleOptionalProperty<>(new Object()); // this property is filled
OptionalProperty<Object> empty = new SimpleOptionalProperty<>(); // this one is empty
Retrieve the optional value
Optional<Object> maybeObject = property.asOptional();
Typed optional properties
String
OptionalProperty<String> property = new OptionalStringProperty<>("your property value");
OptionalProperty<String> empty = new OptionalStringProperty<>();
Integer
OptionalProperty<Integer> property = new OptionalIntegerProperty<>(123);
OptionalProperty<Integer> empty = new OptionalIntegerProperty<>();
Double
OptionalProperty<Double> property = new OptionalDoubleProperty<>(1.23);
OptionalProperty<Double> empty = new OptionalDoubleProperty<>();
Boolean
OptionalProperty<Boolean> property = new OptionalBooleanProperty<>(true);
OptionalProperty<Boolean> empty = new OptionalBooleanProperty<>();
Long
OptionalProperty<Long> property = new OptionalLongProperty<>(123L);
OptionalProperty<Long> empty = new OptionalLongProperty<>();
Float
OptionalProperty<Float> property = new OptionalFloatProperty<>(1.23f);
OptionalProperty<Float> empty = new OptionalFloatProperty<>();
Short
short myShort = 123;
OptionalProperty<Short> property = new OptionalShortProperty<>(myShort);
OptionalProperty<Short> empty = new OptionalShortProperty<>();