com.vaadin.event.dd.acceptcriteria

Class ClientSideCriterion

java.lang.Object

com.vaadin.event.dd.acceptcriteria.ClientSideCriterion

All Implemented Interfaces:

AcceptCriterion, Serializable

Direct Known Subclasses:

AcceptAll, And, ContainsDataFlavor, Not, Or, SourceIs, SourceIsTarget, TargetDetailIs

public abstract class ClientSideCriterion
extends Object
implements AcceptCriterion

Parent class for criteria that can be completely validated on client side. All classes that provide criteria that can be completely validated on client side should extend this class. It is recommended that subclasses of ClientSideCriterion re-validate the condition on the server side in AcceptCriterion.accept(com.vaadin.event.dd.DragAndDropEvent) after the client side validation has accepted a transfer.

Since:

6.3

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ClientSideCriterion()

Method Summary

Modifier and Type	Method and Description
protected String	getIdentifier()
boolean	isClientSideVerifiable() Returns whether the criteria can be checked on the client or whether a server request is needed to check the criteria.
void	paint(PaintTarget target)
protected void	paintContent(PaintTarget target)
void	paintResponse(PaintTarget target) This needs to be implemented if and only if a criterion does some lazy server side initialization.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.vaadin.event.dd.acceptcriteria.AcceptCriterion

accept

Constructor Detail

ClientSideCriterion

public ClientSideCriterion()

Method Detail

isClientSideVerifiable

public final boolean isClientSideVerifiable()

Description copied from interface: AcceptCriterion

Returns whether the criteria can be checked on the client or whether a server request is needed to check the criteria. This requirement may depend on the state of the criterion (e.g. logical operations between criteria), so this cannot be based on a marker interface.

Specified by:

isClientSideVerifiable in interface AcceptCriterion

paint

public void paint(PaintTarget target)
           throws PaintException

Specified by:

paint in interface AcceptCriterion

Throws:

PaintException

paintContent

protected void paintContent(PaintTarget target)
                     throws PaintException

Throws:

PaintException

getIdentifier

protected String getIdentifier()

paintResponse

public final void paintResponse(PaintTarget target)
                         throws PaintException

Description copied from interface: AcceptCriterion

This needs to be implemented if and only if a criterion does some lazy server side initialization. The UIDL painted in this method will be passed to client side drop handler implementation. Implementation can assume that AcceptCriterion.accept(DragAndDropEvent) is called before this method.

Specified by:

paintResponse in interface AcceptCriterion

Throws:

PaintException