Package com.vaadin.flow.component.internal

Class AbstractFieldSupport<C extends Component & HasValue<AbstractField.ComponentValueChangeEvent<C,T>,T>,T>

java.lang.Object

com.vaadin.flow.component.internal.AbstractFieldSupport<C,T>

Type Parameters:

C - the value change source type

T - the value type

All Implemented Interfaces:

Serializable

public class AbstractFieldSupport<C extends Component & HasValue<AbstractField.ComponentValueChangeEvent<C,T>,T>,T>
extends Object
implements Serializable

Encapsulates all the logic required for a typical field implementation. This reduces the risk of implementing logic changes in AbstractField but not in AbstractCompositeField, or vice versa.

For internal use only. May be renamed or removed in a future release.

Since:

1.0

Author:

Vaadin Ltd

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
AbstractFieldSupport(C component, T defaultValue, SerializableBiPredicate<T,T> valueEquals, SerializableConsumer<T> setPresentationValue)	Creates a new field support.

Method Summary

Modifier and Type	Method	Description
Registration	addValueChangeListener(HasValue.ValueChangeListener<? super AbstractField.ComponentValueChangeEvent<C,T>> listener)	Delegate method for HasValue.addValueChangeListener(com.vaadin.flow.component.HasValue.ValueChangeListener)
T	getEmptyValue()	Delegate method for HasValue.getEmptyValue().
T	getValue()	Delegate method for HasValue.getValue().
void	setModelValue(T newModelValue, boolean fromClient)	Delegate method corresponding to AbstractField.setModelValue(Object, boolean).
void	setValue(T value)	Delegate method for HasValue.setValue(Object).
boolean	valueEquals(T value1, T value2)	Delegate method corresponding to AbstractField.valueEquals(Object, Object).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AbstractFieldSupport

public AbstractFieldSupport(C component,
 T defaultValue,
 SerializableBiPredicate<T,T> valueEquals,
 SerializableConsumer<T> setPresentationValue)

Creates a new field support.

Parameters:

component - the owning field component

defaultValue - the default field value

valueEquals - a callback for comparing values

setPresentationValue - a callback for setting presentation values

Method Details

addValueChangeListener

public Registration addValueChangeListener(HasValue.ValueChangeListener<? super AbstractField.ComponentValueChangeEvent<C,T>> listener)

Delegate method for HasValue.addValueChangeListener(com.vaadin.flow.component.HasValue.ValueChangeListener)

Parameters:

listener - the listener to add

Returns:

a registration for the listener

getValue

public T getValue()

Delegate method for HasValue.getValue().

Returns:

the field value

getEmptyValue

public T getEmptyValue()

Delegate method for HasValue.getEmptyValue().

Returns:

the empty value of this field

setValue

public void setValue(T value)

Delegate method for HasValue.setValue(Object).

Parameters:

value - the value to set

valueEquals

public boolean valueEquals(T value1,
 T value2)

Delegate method corresponding to AbstractField.valueEquals(Object, Object).

Parameters:

value1 - the first instance

value2 - the second instance

Returns:

true if the instances are equal; otherwise false

setModelValue

public void setModelValue(T newModelValue,
 boolean fromClient)

Delegate method corresponding to AbstractField.setModelValue(Object, boolean).

Parameters:

newModelValue - the new internal value to use

fromClient - true if the new value originates from the client; otherwise false