Fix for missing world skipping. & Added metrics.

.gitlab-ci.yml

@@ -4,7 +4,7 @@ stages:
 variables:
   name: "UltimateRepairing"
   path: "/builds/$CI_PROJECT_PATH"
-  version: "1.2.2"
+  version: "1.2.3"
 
 build:
   stage: build

src/main/java/com/songoda/ultimaterepairing/UltimateRepairing.java

@@ -18,7 +18,6 @@ import com.songoda.update.Plugin;
 import com.songoda.update.SongodaUpdate;
 import org.apache.commons.lang.ArrayUtils;
 import org.bukkit.Bukkit;
-import org.bukkit.ChatColor;
 import org.bukkit.Location;
 import org.bukkit.command.CommandSender;
 import org.bukkit.event.Listener;
@@ -89,24 +88,31 @@ public final class UltimateRepairing extends JavaPlugin implements Listener {
         if (pluginManager.isPluginEnabled("HolographicDisplays"))
             hologram = new HologramHolographicDisplays(this);
 
-        /*
+        Bukkit.getScheduler().scheduleSyncDelayedTask(this, () -> {
-         * Register anvils into AnvilManager from Configuration.
+            /*
-         */
+             * Register anvils into AnvilManager from Configuration.
-        if (dataFile.getConfig().contains("data")) {
+             */
-            for (String key : dataFile.getConfig().getConfigurationSection("data").getKeys(false)) {
+            if (dataFile.getConfig().contains("data")) {
-                Location location = Methods.unserializeLocation(key);
+                for (String key : dataFile.getConfig().getConfigurationSection("data").getKeys(false)) {
-                UAnvil anvil = anvilManager.getAnvil(location);
+                    Location location = Methods.unserializeLocation(key);
-                anvil.setHologram(dataFile.getConfig().getBoolean("data." + key + ".hologram"));
+                    UAnvil anvil = anvilManager.getAnvil(location);
-                anvil.setInfinity(dataFile.getConfig().getBoolean("data." + key + ".infinity"));
+                    anvil.setHologram(dataFile.getConfig().getBoolean("data." + key + ".hologram"));
-                anvil.setParticles(dataFile.getConfig().getBoolean("data." + key + ".particles"));
+                    anvil.setInfinity(dataFile.getConfig().getBoolean("data." + key + ".infinity"));
-                anvil.setPermPlaced(dataFile.getConfig().getBoolean("data." + key + ".permPlaced"));
+                    anvil.setParticles(dataFile.getConfig().getBoolean("data." + key + ".particles"));
+                    anvil.setPermPlaced(dataFile.getConfig().getBoolean("data." + key + ".permPlaced"));
+                }
             }
-        }
 
-        getServer().getPluginManager().registerEvents(new PlayerListeners(this), this);
+        }, 6L);
-        getServer().getPluginManager().registerEvents(new BlockListeners(this), this);
+
-        getServer().getPluginManager().registerEvents(new InteractListeners(this), this);
+        // Start Metrics
-        getServer().getPluginManager().registerEvents(new InventoryListeners(this), this);
+        new Metrics(this);
+
+        // Event registration
+        pluginManager.registerEvents(new PlayerListeners(this), this);
+        pluginManager.registerEvents(new BlockListeners(this), this);
+        pluginManager.registerEvents(new InteractListeners(this), this);
+        pluginManager.registerEvents(new InventoryListeners(this), this);
 
         Bukkit.getScheduler().runTaskTimerAsynchronously(this, this::saveToFile, 6000, 6000);
         console.sendMessage(Methods.formatText("&a============================="));

src/main/java/com/songoda/ultimaterepairing/utils/Methods.java

@@ -200,7 +200,7 @@ public class Methods {
      * @return The serialized data.
      */
     public static String serializeLocation(Location location) {
-        if (location == null)
+        if (location == null || location.getWorld() == null)
             return "";
         String w = location.getWorld().getName();
         double x = location.getX();

src/main/java/com/songoda/ultimaterepairing/utils/Metrics.java

@@ -0,0 +1,695 @@
+package com.songoda.ultimaterepairing.utils;
+
+import org.bukkit.Bukkit;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
+import org.bukkit.plugin.RegisteredServiceProvider;
+import org.bukkit.plugin.ServicePriority;
+import org.json.simple.JSONArray;
+import org.json.simple.JSONObject;
+
+import javax.net.ssl.HttpsURLConnection;
+import java.io.*;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
+import java.util.*;
+import java.util.concurrent.Callable;
+import java.util.logging.Level;
+import java.util.zip.GZIPOutputStream;
+
+/**
+ * bStats collects some data for plugin authors.
+ * <p>
+ * Check out https://bStats.org/ to learn more about bStats!
+ */
+@SuppressWarnings({"WeakerAccess", "unused"})
+public class Metrics {
+
+    static {
+        // You can use the property to disable the check in your test environment
+        if (System.getProperty("bstats.relocatecheck") == null || !System.getProperty("bstats.relocatecheck").equals("false")) {
+            // Maven's Relocate is clever and changes strings, too. So we have to use this little "trick" ... :D
+            final String defaultPackage = new String(
+                    new byte[]{'o', 'r', 'g', '.', 'b', 's', 't', 'a', 't', 's', '.', 'b', 'u', 'k', 'k', 'i', 't'});
+            final String examplePackage = new String(new byte[]{'y', 'o', 'u', 'r', '.', 'p', 'a', 'c', 'k', 'a', 'g', 'e'});
+            // We want to make sure nobody just copy & pastes the example and use the wrong package names
+            if (Metrics.class.getPackage().getName().equals(defaultPackage) || Metrics.class.getPackage().getName().equals(examplePackage)) {
+                throw new IllegalStateException("bStats Metrics class has not been relocated correctly!");
+            }
+        }
+    }
+
+    // The version of this bStats class
+    public static final int B_STATS_VERSION = 1;
+
+    // The url to which the data is sent
+    private static final String URL = "https://bStats.org/submitData/bukkit";
+
+    // Is bStats enabled on this server?
+    private boolean enabled;
+
+    // Should failed requests be logged?
+    private static boolean logFailedRequests;
+
+    // Should the sent data be logged?
+    private static boolean logSentData;
+
+    // Should the response text be logged?
+    private static boolean logResponseStatusText;
+
+    // The uuid of the server
+    private static String serverUUID;
+
+    // The plugin
+    private final Plugin plugin;
+
+    // A list with all custom charts
+    private final List<CustomChart> charts = new ArrayList<>();
+
+    /**
+     * Class constructor.
+     *
+     * @param plugin The plugin which stats should be submitted.
+     */
+    public Metrics(Plugin plugin) {
+        if (plugin == null) {
+            throw new IllegalArgumentException("Plugin cannot be null!");
+        }
+        this.plugin = plugin;
+
+        // Get the config file
+        File bStatsFolder = new File(plugin.getDataFolder().getParentFile(), "bStats");
+        File configFile = new File(bStatsFolder, "config.yml");
+        YamlConfiguration config = YamlConfiguration.loadConfiguration(configFile);
+
+        // Check if the config file exists
+        if (!config.isSet("serverUuid")) {
+
+            // Add default values
+            config.addDefault("enabled", true);
+            // Every server gets it's unique random id.
+            config.addDefault("serverUuid", UUID.randomUUID().toString());
+            // Should failed request be logged?
+            config.addDefault("logFailedRequests", false);
+            // Should the sent data be logged?
+            config.addDefault("logSentData", false);
+            // Should the response text be logged?
+            config.addDefault("logResponseStatusText", false);
+
+            // Inform the server owners about bStats
+            config.options().header(
+                    "bStats collects some data for plugin authors like how many servers are using their plugins.\n" +
+                            "To honor their work, you should not disable it.\n" +
+                            "This has nearly no effect on the server performance!\n" +
+                            "Check out https://bStats.org/ to learn more :)"
+            ).copyDefaults(true);
+            try {
+                config.save(configFile);
+            } catch (IOException ignored) { }
+        }
+
+        // Load the data
+        enabled = config.getBoolean("enabled", true);
+        serverUUID = config.getString("serverUuid");
+        logFailedRequests = config.getBoolean("logFailedRequests", false);
+        logSentData = config.getBoolean("logSentData", false);
+        logResponseStatusText = config.getBoolean("logResponseStatusText", false);
+
+        if (enabled) {
+            boolean found = false;
+            // Search for all other bStats Metrics classes to see if we are the first one
+            for (Class<?> service : Bukkit.getServicesManager().getKnownServices()) {
+                try {
+                    service.getField("B_STATS_VERSION"); // Our identifier :)
+                    found = true; // We aren't the first
+                    break;
+                } catch (NoSuchFieldException ignored) { }
+            }
+            // Register our service
+            Bukkit.getServicesManager().register(Metrics.class, this, plugin, ServicePriority.Normal);
+            if (!found) {
+                // We are the first!
+                startSubmitting();
+            }
+        }
+    }
+
+    /**
+     * Checks if bStats is enabled.
+     *
+     * @return Whether bStats is enabled or not.
+     */
+    public boolean isEnabled() {
+        return enabled;
+    }
+
+    /**
+     * Adds a custom chart.
+     *
+     * @param chart The chart to add.
+     */
+    public void addCustomChart(CustomChart chart) {
+        if (chart == null) {
+            throw new IllegalArgumentException("Chart cannot be null!");
+        }
+        charts.add(chart);
+    }
+
+    /**
+     * Starts the Scheduler which submits our data every 30 minutes.
+     */
+    private void startSubmitting() {
+        final Timer timer = new Timer(true); // We use a timer cause the Bukkit scheduler is affected by server lags
+        timer.scheduleAtFixedRate(new TimerTask() {
+            @Override
+            public void run() {
+                if (!plugin.isEnabled()) { // Plugin was disabled
+                    timer.cancel();
+                    return;
+                }
+                // Nevertheless we want our code to run in the Bukkit main thread, so we have to use the Bukkit scheduler
+                // Don't be afraid! The connection to the bStats server is still async, only the stats collection is sync ;)
+                Bukkit.getScheduler().runTask(plugin, () -> submitData());
+            }
+        }, 1000 * 60 * 5, 1000 * 60 * 30);
+        // Submit the data every 30 minutes, first time after 5 minutes to give other plugins enough time to start
+        // WARNING: Changing the frequency has no effect but your plugin WILL be blocked/deleted!
+        // WARNING: Just don't do it!
+    }
+
+    /**
+     * Gets the plugin specific data.
+     * This method is called using Reflection.
+     *
+     * @return The plugin specific data.
+     */
+    public JSONObject getPluginData() {
+        JSONObject data = new JSONObject();
+
+        String pluginName = plugin.getDescription().getName();
+        String pluginVersion = plugin.getDescription().getVersion();
+
+        data.put("pluginName", pluginName); // Append the name of the plugin
+        data.put("pluginVersion", pluginVersion); // Append the version of the plugin
+        JSONArray customCharts = new JSONArray();
+        for (CustomChart customChart : charts) {
+            // Add the data of the custom charts
+            JSONObject chart = customChart.getRequestJsonObject();
+            if (chart == null) { // If the chart is null, we skip it
+                continue;
+            }
+            customCharts.add(chart);
+        }
+        data.put("customCharts", customCharts);
+
+        return data;
+    }
+
+    /**
+     * Gets the server specific data.
+     *
+     * @return The server specific data.
+     */
+    private JSONObject getServerData() {
+        // Minecraft specific data
+        int playerAmount;
+        try {
+            // Around MC 1.8 the return type was changed to a collection from an array,
+            // This fixes java.lang.NoSuchMethodError: org.bukkit.Bukkit.getOnlinePlayers()Ljava/util/Collection;
+            Method onlinePlayersMethod = Class.forName("org.bukkit.Server").getMethod("getOnlinePlayers");
+            playerAmount = onlinePlayersMethod.getReturnType().equals(Collection.class)
+                    ? ((Collection<?>) onlinePlayersMethod.invoke(Bukkit.getServer())).size()
+                    : ((Player[]) onlinePlayersMethod.invoke(Bukkit.getServer())).length;
+        } catch (Exception e) {
+            playerAmount = Bukkit.getOnlinePlayers().size(); // Just use the new method if the Reflection failed
+        }
+        int onlineMode = Bukkit.getOnlineMode() ? 1 : 0;
+        String bukkitVersion = Bukkit.getVersion();
+
+        // OS/Java specific data
+        String javaVersion = System.getProperty("java.version");
+        String osName = System.getProperty("os.name");
+        String osArch = System.getProperty("os.arch");
+        String osVersion = System.getProperty("os.version");
+        int coreCount = Runtime.getRuntime().availableProcessors();
+
+        JSONObject data = new JSONObject();
+
+        data.put("serverUUID", serverUUID);
+
+        data.put("playerAmount", playerAmount);
+        data.put("onlineMode", onlineMode);
+        data.put("bukkitVersion", bukkitVersion);
+
+        data.put("javaVersion", javaVersion);
+        data.put("osName", osName);
+        data.put("osArch", osArch);
+        data.put("osVersion", osVersion);
+        data.put("coreCount", coreCount);
+
+        return data;
+    }
+
+    /**
+     * Collects the data and sends it afterwards.
+     */
+    private void submitData() {
+        final JSONObject data = getServerData();
+
+        JSONArray pluginData = new JSONArray();
+        // Search for all other bStats Metrics classes to get their plugin data
+        for (Class<?> service : Bukkit.getServicesManager().getKnownServices()) {
+            try {
+                service.getField("B_STATS_VERSION"); // Our identifier :)
+
+                for (RegisteredServiceProvider<?> provider : Bukkit.getServicesManager().getRegistrations(service)) {
+                    try {
+                        pluginData.add(provider.getService().getMethod("getPluginData").invoke(provider.getProvider()));
+                    } catch (NullPointerException | NoSuchMethodException | IllegalAccessException | InvocationTargetException ignored) { }
+                }
+            } catch (NoSuchFieldException ignored) { }
+        }
+
+        data.put("plugins", pluginData);
+
+        // Create a new thread for the connection to the bStats server
+        new Thread(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    // Send the data
+                    sendData(plugin, data);
+                } catch (Exception e) {
+                    // Something went wrong! :(
+                    if (logFailedRequests) {
+                        plugin.getLogger().log(Level.WARNING, "Could not submit plugin stats of " + plugin.getName(), e);
+                    }
+                }
+            }
+        }).start();
+    }
+
+    /**
+     * Sends the data to the bStats server.
+     *
+     * @param plugin Any plugin. It's just used to get a logger instance.
+     * @param data The data to send.
+     * @throws Exception If the request failed.
+     */
+    private static void sendData(Plugin plugin, JSONObject data) throws Exception {
+        if (data == null) {
+            throw new IllegalArgumentException("Data cannot be null!");
+        }
+        if (Bukkit.isPrimaryThread()) {
+            throw new IllegalAccessException("This method must not be called from the main thread!");
+        }
+        if (logSentData) {
+            plugin.getLogger().info("Sending data to bStats: " + data.toString());
+        }
+        HttpsURLConnection connection = (HttpsURLConnection) new URL(URL).openConnection();
+
+        // Compress the data to save bandwidth
+        byte[] compressedData = compress(data.toString());
+
+        // Add headers
+        connection.setRequestMethod("POST");
+        connection.addRequestProperty("Accept", "application/json");
+        connection.addRequestProperty("Connection", "close");
+        connection.addRequestProperty("Content-Encoding", "gzip"); // We gzip our request
+        connection.addRequestProperty("Content-Length", String.valueOf(compressedData.length));
+        connection.setRequestProperty("Content-Type", "application/json"); // We send our data in JSON format
+        connection.setRequestProperty("User-Agent", "MC-Server/" + B_STATS_VERSION);
+
+        // Send data
+        connection.setDoOutput(true);
+        DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());
+        outputStream.write(compressedData);
+        outputStream.flush();
+        outputStream.close();
+
+        InputStream inputStream = connection.getInputStream();
+        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
+
+        StringBuilder builder = new StringBuilder();
+        String line;
+        while ((line = bufferedReader.readLine()) != null) {
+            builder.append(line);
+        }
+        bufferedReader.close();
+        if (logResponseStatusText) {
+            plugin.getLogger().info("Sent data to bStats and received response: " + builder.toString());
+        }
+    }
+
+    /**
+     * Gzips the given String.
+     *
+     * @param str The string to gzip.
+     * @return The gzipped String.
+     * @throws IOException If the compression failed.
+     */
+    private static byte[] compress(final String str) throws IOException {
+        if (str == null) {
+            return null;
+        }
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        GZIPOutputStream gzip = new GZIPOutputStream(outputStream);
+        gzip.write(str.getBytes(StandardCharsets.UTF_8));
+        gzip.close();
+        return outputStream.toByteArray();
+    }
+
+    /**
+     * Represents a custom chart.
+     */
+    public static abstract class CustomChart {
+
+        // The id of the chart
+        final String chartId;
+
+        /**
+         * Class constructor.
+         *
+         * @param chartId The id of the chart.
+         */
+        CustomChart(String chartId) {
+            if (chartId == null || chartId.isEmpty()) {
+                throw new IllegalArgumentException("ChartId cannot be null or empty!");
+            }
+            this.chartId = chartId;
+        }
+
+        private JSONObject getRequestJsonObject() {
+            JSONObject chart = new JSONObject();
+            chart.put("chartId", chartId);
+            try {
+                JSONObject data = getChartData();
+                if (data == null) {
+                    // If the data is null we don't send the chart.
+                    return null;
+                }
+                chart.put("data", data);
+            } catch (Throwable t) {
+                if (logFailedRequests) {
+                    Bukkit.getLogger().log(Level.WARNING, "Failed to get data for custom chart with id " + chartId, t);
+                }
+                return null;
+            }
+            return chart;
+        }
+
+        protected abstract JSONObject getChartData() throws Exception;
+
+    }
+
+    /**
+     * Represents a custom simple pie.
+     */
+    public static class SimplePie extends CustomChart {
+
+        private final Callable<String> callable;
+
+        /**
+         * Class constructor.
+         *
+         * @param chartId The id of the chart.
+         * @param callable The callable which is used to request the chart data.
+         */
+        public SimplePie(String chartId, Callable<String> callable) {
+            super(chartId);
+            this.callable = callable;
+        }
+
+        @Override
+        protected JSONObject getChartData() throws Exception {
+            JSONObject data = new JSONObject();
+            String value = callable.call();
+            if (value == null || value.isEmpty()) {
+                // Null = skip the chart
+                return null;
+            }
+            data.put("value", value);
+            return data;
+        }
+    }
+
+    /**
+     * Represents a custom advanced pie.
+     */
+    public static class AdvancedPie extends CustomChart {
+
+        private final Callable<Map<String, Integer>> callable;
+
+        /**
+         * Class constructor.
+         *
+         * @param chartId The id of the chart.
+         * @param callable The callable which is used to request the chart data.
+         */
+        public AdvancedPie(String chartId, Callable<Map<String, Integer>> callable) {
+            super(chartId);
+            this.callable = callable;
+        }
+
+        @Override
+        protected JSONObject getChartData() throws Exception {
+            JSONObject data = new JSONObject();
+            JSONObject values = new JSONObject();
+            Map<String, Integer> map = callable.call();
+            if (map == null || map.isEmpty()) {
+                // Null = skip the chart
+                return null;
+            }
+            boolean allSkipped = true;
+            for (Map.Entry<String, Integer> entry : map.entrySet()) {
+                if (entry.getValue() == 0) {
+                    continue; // Skip this invalid
+                }
+                allSkipped = false;
+                values.put(entry.getKey(), entry.getValue());
+            }
+            if (allSkipped) {
+                // Null = skip the chart
+                return null;
+            }
+            data.put("values", values);
+            return data;
+        }
+    }
+
+    /**
+     * Represents a custom drilldown pie.
+     */
+    public static class DrilldownPie extends CustomChart {
+
+        private final Callable<Map<String, Map<String, Integer>>> callable;
+
+        /**
+         * Class constructor.
+         *
+         * @param chartId The id of the chart.
+         * @param callable The callable which is used to request the chart data.
+         */
+        public DrilldownPie(String chartId, Callable<Map<String, Map<String, Integer>>> callable) {
+            super(chartId);
+            this.callable = callable;
+        }
+
+        @Override
+        public JSONObject getChartData() throws Exception {
+            JSONObject data = new JSONObject();
+            JSONObject values = new JSONObject();
+            Map<String, Map<String, Integer>> map = callable.call();
+            if (map == null || map.isEmpty()) {
+                // Null = skip the chart
+                return null;
+            }
+            boolean reallyAllSkipped = true;
+            for (Map.Entry<String, Map<String, Integer>> entryValues : map.entrySet()) {
+                JSONObject value = new JSONObject();
+                boolean allSkipped = true;
+                for (Map.Entry<String, Integer> valueEntry : map.get(entryValues.getKey()).entrySet()) {
+                    value.put(valueEntry.getKey(), valueEntry.getValue());
+                    allSkipped = false;
+                }
+                if (!allSkipped) {
+                    reallyAllSkipped = false;
+                    values.put(entryValues.getKey(), value);
+                }
+            }
+            if (reallyAllSkipped) {
+                // Null = skip the chart
+                return null;
+            }
+            data.put("values", values);
+            return data;
+        }
+    }
+
+    /**
+     * Represents a custom single line chart.
+     */
+    public static class SingleLineChart extends CustomChart {
+
+        private final Callable<Integer> callable;
+
+        /**
+         * Class constructor.
+         *
+         * @param chartId The id of the chart.
+         * @param callable The callable which is used to request the chart data.
+         */
+        public SingleLineChart(String chartId, Callable<Integer> callable) {
+            super(chartId);
+            this.callable = callable;
+        }
+
+        @Override
+        protected JSONObject getChartData() throws Exception {
+            JSONObject data = new JSONObject();
+            int value = callable.call();
+            if (value == 0) {
+                // Null = skip the chart
+                return null;
+            }
+            data.put("value", value);
+            return data;
+        }
+
+    }
+
+    /**
+     * Represents a custom multi line chart.
+     */
+    public static class MultiLineChart extends CustomChart {
+
+        private final Callable<Map<String, Integer>> callable;
+
+        /**
+         * Class constructor.
+         *
+         * @param chartId The id of the chart.
+         * @param callable The callable which is used to request the chart data.
+         */
+        public MultiLineChart(String chartId, Callable<Map<String, Integer>> callable) {
+            super(chartId);
+            this.callable = callable;
+        }
+
+        @Override
+        protected JSONObject getChartData() throws Exception {
+            JSONObject data = new JSONObject();
+            JSONObject values = new JSONObject();
+            Map<String, Integer> map = callable.call();
+            if (map == null || map.isEmpty()) {
+                // Null = skip the chart
+                return null;
+            }
+            boolean allSkipped = true;
+            for (Map.Entry<String, Integer> entry : map.entrySet()) {
+                if (entry.getValue() == 0) {
+                    continue; // Skip this invalid
+                }
+                allSkipped = false;
+                values.put(entry.getKey(), entry.getValue());
+            }
+            if (allSkipped) {
+                // Null = skip the chart
+                return null;
+            }
+            data.put("values", values);
+            return data;
+        }
+
+    }
+
+    /**
+     * Represents a custom simple bar chart.
+     */
+    public static class SimpleBarChart extends CustomChart {
+
+        private final Callable<Map<String, Integer>> callable;
+
+        /**
+         * Class constructor.
+         *
+         * @param chartId The id of the chart.
+         * @param callable The callable which is used to request the chart data.
+         */
+        public SimpleBarChart(String chartId, Callable<Map<String, Integer>> callable) {
+            super(chartId);
+            this.callable = callable;
+        }
+
+        @Override
+        protected JSONObject getChartData() throws Exception {
+            JSONObject data = new JSONObject();
+            JSONObject values = new JSONObject();
+            Map<String, Integer> map = callable.call();
+            if (map == null || map.isEmpty()) {
+                // Null = skip the chart
+                return null;
+            }
+            for (Map.Entry<String, Integer> entry : map.entrySet()) {
+                JSONArray categoryValues = new JSONArray();
+                categoryValues.add(entry.getValue());
+                values.put(entry.getKey(), categoryValues);
+            }
+            data.put("values", values);
+            return data;
+        }
+
+    }
+
+    /**
+     * Represents a custom advanced bar chart.
+     */
+    public static class AdvancedBarChart extends CustomChart {
+
+        private final Callable<Map<String, int[]>> callable;
+
+        /**
+         * Class constructor.
+         *
+         * @param chartId The id of the chart.
+         * @param callable The callable which is used to request the chart data.
+         */
+        public AdvancedBarChart(String chartId, Callable<Map<String, int[]>> callable) {
+            super(chartId);
+            this.callable = callable;
+        }
+
+        @Override
+        protected JSONObject getChartData() throws Exception {
+            JSONObject data = new JSONObject();
+            JSONObject values = new JSONObject();
+            Map<String, int[]> map = callable.call();
+            if (map == null || map.isEmpty()) {
+                // Null = skip the chart
+                return null;
+            }
+            boolean allSkipped = true;
+            for (Map.Entry<String, int[]> entry : map.entrySet()) {
+                if (entry.getValue().length == 0) {
+                    continue; // Skip this invalid
+                }
+                allSkipped = false;
+                JSONArray categoryValues = new JSONArray();
+                for (int categoryValue : entry.getValue()) {
+                    categoryValues.add(categoryValue);
+                }
+                values.put(entry.getKey(), categoryValues);
+            }
+            if (allSkipped) {
+                // Null = skip the chart
+                return null;
+            }
+            data.put("values", values);
+            return data;
+        }
+    }
+
+}