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Vaadin is a web application framework for Rich Internet Applications (RIA). Vaadin enables easy development and maintenance of fast and secure rich web applications with a stunning look and feel and a wide browser support. It features a server-side architecture with the majority of the logic running on the server. Ajax technology is used at the browser-side to ensure a rich and interactive user experience.

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/*
 * 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.client.ui.dd;

import com.vaadin.client.UIDL;
import com.vaadin.event.dd.acceptcriteria.ServerSideCriterion;
import com.vaadin.shared.ui.dd.AcceptCriterion;

@AcceptCriterion(ServerSideCriterion.class)
final public class VServerAccept extends VAcceptCriterion {
    @Override
    public void accept(final VDragEvent drag, UIDL configuration,
            final VAcceptCallback callback) {

        VDragEventServerCallback acceptCallback = new VDragEventServerCallback() {
            @Override
            public void handleResponse(boolean accepted, UIDL response) {
                if (accepted) {
                    callback.accepted(drag);
                }
            }
        };
        VDragAndDropManager.get().visitServer(acceptCallback);
    }

    @Override
    public boolean needsServerSideCheck(VDragEvent drag, UIDL criterioUIDL) {
        return true;
    }

    @Override
    protected boolean accept(VDragEvent drag, UIDL configuration) {
        return false; // not used
    }
}