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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.connectors.grid;

import com.vaadin.client.ServerConnector;
import com.vaadin.client.annotations.OnStateChange;
import com.vaadin.client.connectors.AbstractRendererConnector;
import com.vaadin.client.extensions.AbstractExtensionConnector;
import com.vaadin.client.widgets.Grid.Column;
import com.vaadin.shared.data.DataCommunicatorConstants;
import com.vaadin.shared.ui.Connect;
import com.vaadin.shared.ui.grid.ColumnState;

import elemental.json.JsonObject;
import elemental.json.JsonValue;

/**
 * A connector class for columns of the Grid component.
 *
 * @author Vaadin Ltd
 * @since 8.0
 */
@Connect(com.vaadin.ui.Grid.Column.class)
public class ColumnConnector extends AbstractExtensionConnector {

    static abstract class CustomColumn extends Column {

        private final String connectorId;

        CustomColumn(String connectorId) {
            this.connectorId = connectorId;
        }

        public String getConnectorId() {
            return connectorId;
        }
    }

    private CustomColumn column;

    /* This parent is needed because it's no longer available in onUnregister */
    private GridConnector parent;

    @Override
    protected void extend(ServerConnector target) {
        parent = getParent();
        column = new CustomColumn(getConnectorId()) {

            @Override
            public Object getValue(JsonObject row) {
                final JsonObject rowData = row
                        .getObject(DataCommunicatorConstants.DATA);

                if (rowData.hasKey(getConnectorId())) {
                    final JsonValue columnValue = rowData.get(getConnectorId());

                    return getRendererConnector().decode(columnValue);
                }

                return null;
            }
        };

        // Initially set a renderer
        updateRenderer();

        getParent().addColumn(column, getState().internalId);

    }

    @SuppressWarnings("unchecked")
    private AbstractRendererConnector