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Dashbuilder Renderer for the Google Visualization API
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/*
 * Copyright 2014 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.dashbuilder.renderer.google.client;

import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;

import com.googlecode.gwt.charts.client.ChartLoader;
import com.googlecode.gwt.charts.client.ChartPackage;
import org.dashbuilder.displayer.DisplayerSettings;
import org.dashbuilder.displayer.DisplayerSubType;
import org.dashbuilder.displayer.DisplayerType;
import org.dashbuilder.displayer.client.AbstractRendererLibrary;
import org.dashbuilder.displayer.client.Displayer;
import org.jboss.errai.ioc.client.container.SyncBeanManager;

import static org.dashbuilder.displayer.DisplayerType.*;
import static org.dashbuilder.displayer.DisplayerSubType.*;

import java.util.EnumSet;

/**
 * Google's Visualization API based renderer.
 */
@ApplicationScoped
public class GoogleRenderer extends AbstractRendererLibrary {

    public static final String UUID = "gwtcharts";

    private static Map _packageTypes = new HashMap();
    static {
        _packageTypes.put(BARCHART, ChartPackage.CORECHART);
        _packageTypes.put(PIECHART, ChartPackage.CORECHART);
        _packageTypes.put(AREACHART, ChartPackage.CORECHART);
        _packageTypes.put(LINECHART, ChartPackage.CORECHART);
        _packageTypes.put(BUBBLECHART, ChartPackage.CORECHART);
        _packageTypes.put(METERCHART, ChartPackage.GAUGE);
        _packageTypes.put(TABLE, ChartPackage.TABLE);
        _packageTypes.put(MAP, ChartPackage.GEOCHART);
    }

    private List _supportedTypes = Arrays.asList(
            BARCHART,
            PIECHART,
            AREACHART,
            LINECHART,
            BUBBLECHART,
            METERCHART,
            TABLE,
            MAP);

    @Inject
    protected SyncBeanManager beanManager;

    @Override
    public String getUUID() {
        return UUID;
    }

    @Override
    public String getName() {
        return "GWT Charts";
    }

    @Override
    public List getSupportedTypes() {
        return _supportedTypes;
    }

    @Override
    public List getSupportedSubtypes(DisplayerType displayerType) {
        switch (displayerType) {
            case BARCHART:
                return Arrays.asList(BAR, BAR_STACKED, COLUMN, COLUMN_STACKED);
            case PIECHART:
                return Arrays.asList(PIE, PIE_3D, DONUT);
            case AREACHART:
                return Arrays.asList(AREA, AREA_STACKED /*,STEPPED*/);
            case LINECHART:
                return Arrays.asList(LINE, SMOOTH);
            case MAP:
                return Arrays.asList(MAP_REGIONS, MAP_MARKERS);
            default:
                return Arrays.asList();
        }
    }

    public Displayer lookupDisplayer(DisplayerSettings displayerSettings) {
        DisplayerType displayerType = displayerSettings.getType();
        GoogleDisplayer displayer;
        switch (displayerType) {
            case BARCHART:
                displayer = beanManager.lookupBean(GoogleBarChartDisplayer.class).newInstance();
                break;
            case PIECHART:
                displayer = beanManager.lookupBean(GooglePieChartDisplayer.class).newInstance();
                break;
            case AREACHART:
                displayer = beanManager.lookupBean(GoogleAreaChartDisplayer.class).newInstance();
                break;
            case LINECHART:
                displayer = beanManager.lookupBean(GoogleLineChartDisplayer.class).newInstance();
                break;
            case BUBBLECHART:
                displayer = beanManager.lookupBean(GoogleBubbleChartDisplayer.class).newInstance();
                break;
            case METERCHART:
                displayer = beanManager.lookupBean(GoogleMeterChartDisplayer.class).newInstance();
                break;
            case TABLE:
                displayer = beanManager.lookupBean(GoogleTableDisplayer.class).newInstance();
                break;
            case MAP:
                displayer = beanManager.lookupBean(GoogleMapDisplayer.class).newInstance();
                break;
            default:
                return null;
        }
        ((GoogleDisplayerView) displayer.getView()).setRenderer(this);
        return displayer;
    }

    /**
     *  In Google the renderer mechanism is asynchronous.
     */
    public void draw(final List displayerList) {
        // Get the modules to load.
        Set packageList = EnumSet.noneOf(ChartPackage.class);
        for (Displayer displayer : displayerList) {
            try {
                GoogleDisplayer googleDisplayer = (GoogleDisplayer) displayer;
                packageList.add(_packageTypes.get(googleDisplayer.getDisplayerSettings().getType()));
            } catch (ClassCastException e) {
                // Just ignore non Google displayers.
            }
        }
        // Create an array of packages.
        ChartPackage[] packageArray = new ChartPackage[packageList.size()];
        int i = 0;
        for (ChartPackage pkg : packageList) {
            packageArray[i++] = pkg;
        }
        // Load the visualization API
        ChartLoader chartLoader = new ChartLoader(packageArray);
        chartLoader.loadApi(new Runnable() {

            // Called when the visualization API has been loaded.
            public void run() {
                for (Displayer displayer : displayerList) {
                    try {
                        GoogleDisplayer googleDisplayer = (GoogleDisplayer) displayer;
                        googleDisplayer.ready();
                    } catch (ClassCastException e) {
                        // Just ignore non Google displayers.
                    }
                }
            }
        });
    }
    
    @Override
    public boolean isOffline() {
        return false;
    }
}