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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 java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import com.vaadin.client.ComponentConnector;
import com.vaadin.event.dd.DragSource;

/**
 * Client side counterpart for Transferable in com.vaadin.event.Transferable
 *
 */
public class VTransferable {

    private ComponentConnector component;

    private final Map variables = new HashMap<>();

    /**
     * Returns the component from which the transferable is created (eg. a tree
     * which node is dragged).
     *
     * @return the component
     */
    public ComponentConnector getDragSource() {
        return component;
    }

    /**
     * Sets the component currently being dragged or from which the transferable
     * is created (eg. a tree which node is dragged).
     * 
     * The server side counterpart of the component may implement
     * {@link DragSource} interface if it wants to translate or complement the
     * server side instance of this Transferable.
     *
     * @param component
     *            the component to set
     */
    public void setDragSource(ComponentConnector component) {
        this.component = component;
    }

    public Object getData(String dataFlavor) {
        return variables.get(dataFlavor);
    }

    public void setData(String dataFlavor, Object value) {
        variables.put(dataFlavor, value);
    }

    public Collection getDataFlavors() {
        return variables.keySet();
    }

    /**
     * This helper method should only be called by {@link VDragAndDropManager}.
     *
     * @return data in this Transferable that needs to be moved to server.
     */
    Map getVariableMap() {
        return variables;
    }

}