fix doubles instead ints in gson java

java-package/brainflow/src/main/java/brainflow/BoardDescr.java

@@ -0,0 +1,47 @@
+package brainflow;
+
+import java.util.List;
+
+public class BoardDescr
+{
+    public Integer sampling_rate;
+    public List<Integer> eeg_channels;
+    public List<Integer> eog_channels;
+    public List<Integer> exg_channels;
+    public List<Integer> emg_channels;
+    public List<Integer> ppg_channels;
+    public List<Integer> eda_channels;
+    public List<Integer> accel_channels;
+    public List<Integer> gyro_channels;
+    public List<Integer> temperature_channels;
+    public List<Integer> resistance_channels;
+    public List<Integer> other_channels;
+    public Integer package_num_channel;
+    public Integer batter_channel;
+    public Integer timestamp_channel;
+    public Integer marker_channel;
+    public Integer num_rows;
+    public String name;
+    public String eeg_names;
+
+    public BoardDescr ()
+    {
+        sampling_rate = null;
+        eeg_channels = null;
+        eog_channels = null;
+        exg_channels = null;
+        emg_channels = null;
+        ppg_channels = null;
+        eda_channels = null;
+        accel_channels = null;
+        gyro_channels = null;
+        temperature_channels = null;
+        resistance_channels = null;
+        other_channels = null;
+        package_num_channel = null;
+        timestamp_channel = null;
+        num_rows = null;
+        name = null;
+        eeg_names = null;
+    }
+}

java-package/brainflow/src/main/java/brainflow/BoardShim.java

@@ -5,9 +5,11 @@
 import java.io.InputStream;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 import org.apache.commons.lang3.SystemUtils;
@@ -328,8 +330,7 @@ public static String[] get_eeg_names (int board_id) throws BrainFlowError
     /**
      * Get board description
      */
-    @SuppressWarnings ("unchecked")
-    public static Map<String, Object> get_board_descr (int board_id) throws BrainFlowError
+    public static <T> T get_board_descr (Class<T> type, int board_id) throws BrainFlowError
     {
         int[] len = new int[1];
         byte[] str = new byte[16000];
@@ -340,9 +341,8 @@ public static Map<String, Object> get_board_descr (int board_id) throws BrainFlo
         }
         String descr_string = new String (str, 0, len[0]);
         Gson gson = new Gson ();
-        Map<String, Object> map = new HashMap<String, Object> ();
-        map = (Map<String, Object>) gson.fromJson (descr_string, map.getClass ());
-        return map;
+        T res = (T) gson.fromJson (descr_string, type);
+        return res;
     }
 
     /**

java-package/brainflow/src/main/java/brainflow/examples/BandPower.java

@@ -14,6 +14,7 @@
 import brainflow.DetrendOperations;
 import brainflow.LogLevels;
 import brainflow.WindowFunctions;
+import brainflow.BoardDescr;
 
 public class BandPower
 {
@@ -25,8 +26,8 @@ public static void main (String[] args) throws Exception
         BrainFlowInputParams params = new BrainFlowInputParams ();
         int board_id = BoardIds.SYNTHETIC_BOARD.get_code ();
         BoardShim board_shim = new BoardShim (board_id, params);
-        Map<String, Object> board_descr = BoardShim.get_board_descr (board_id);
-        int sampling_rate = ((Double) board_descr.get ("sampling_rate")).intValue ();
+        BoardDescr board_descr = BoardShim.get_board_descr (BoardDescr.class, board_id);
+        int sampling_rate = board_descr.sampling_rate;
         int nfft = DataFilter.get_nearest_power_of_two (sampling_rate);
 
         board_shim.prepare_session ();
@@ -37,8 +38,7 @@ public static void main (String[] args) throws Exception
         double[][] data = board_shim.get_board_data ();
         board_shim.release_session ();
 
-        @SuppressWarnings ("unchecked")
-        List<Double> eeg_channels = (List<Double>) board_descr.get ("eeg_channels");
+        List<Integer> eeg_channels = board_descr.eeg_channels;
         // seconds channel of synthetic board has big 'alpha' use it for test
         int eeg_channel = eeg_channels.get (1).intValue ();
         // optional: detrend before psd