/*
* Copyright 2000-2016 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.event.dd.acceptcriteria;
import java.io.Serializable;
import com.vaadin.server.PaintException;
import com.vaadin.server.PaintTarget;
/**
* 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
* {@link AcceptCriterion#accept(com.vaadin.event.dd.DragAndDropEvent)} after
* the client side validation has accepted a transfer.
*
* @since 6.3
*/
public abstract class ClientSideCriterion
implements Serializable, AcceptCriterion {
/*
* All criteria that extend this must be completely validatable on client
* side.
*
* (non-Javadoc)
*
* @see
* com.vaadin.event.dd.acceptCriteria.AcceptCriterion#isClientSideVerifiable
* ()
*/
@Override
public final boolean isClientSideVerifiable() {
return true;
}
@Override
public void paint(PaintTarget target) throws PaintException {
target.startTag("-ac");
target.addAttribute("name", getIdentifier());
paintContent(target);
target.endTag("-ac");
}
protected void paintContent(PaintTarget target) throws PaintException {
}
protected String getIdentifier() {
return getClass().getCanonicalName();
}
@Override
public final void paintResponse(PaintTarget target) throws PaintException {
// NOP, nothing to do as this is client side verified criterion
}
}