updated control access

old code/tray/src/qz/communication/H4J_HidUtilities.java

@@ -0,0 +1,65 @@
+package qz.communication;
+
+
+import org.codehaus.jettison.json.JSONArray;
+import org.codehaus.jettison.json.JSONException;
+import org.codehaus.jettison.json.JSONObject;
+import org.hid4java.HidDevice;
+import org.hid4java.HidManager;
+import org.hid4java.HidServices;
+
+import javax.usb.util.UsbUtil;
+import java.util.HashSet;
+import java.util.List;
+
+public class H4J_HidUtilities {
+    private static final HidServices service = HidManager.getHidServices();
+
+    public static List<HidDevice> getHidDevices() {
+        return service.getAttachedHidDevices();
+    }
+
+    public static JSONArray getHidDevicesJSON() throws JSONException {
+        List<HidDevice> devices = getHidDevices();
+        JSONArray devicesJSON = new JSONArray();
+
+        HashSet<String> unique = new HashSet<>();
+        for(HidDevice device : devices) {
+            JSONObject deviceJSON = new JSONObject();
+
+            deviceJSON.put("vendorId", UsbUtil.toHexString(device.getVendorId()))
+                    .put("productId", UsbUtil.toHexString(device.getProductId()))
+                    .put("usagePage", UsbUtil.toHexString((short)device.getUsagePage()))
+                    .put("serial", device.getSerialNumber())
+                    .put("manufacturer", device.getManufacturer())
+                    .put("product", device.getProduct());
+
+            String uid = String.format("v%sp%su%ss%s", deviceJSON.optString("vendorId"), deviceJSON.optString("productId"), deviceJSON.optString("usagePage"), deviceJSON.optString("serial"));
+            if (!unique.contains(uid)) {
+                devicesJSON.put(deviceJSON);
+                unique.add(uid);
+            }
+        }
+
+        return devicesJSON;
+    }
+
+    public static HidDevice findDevice(DeviceOptions dOpts) {
+        if (dOpts.getVendorId() == null) {
+            throw new IllegalArgumentException("Vendor ID cannot be null");
+        }
+        if (dOpts.getProductId() == null) {
+            throw new IllegalArgumentException("Product ID cannot be null");
+        }
+
+        List<HidDevice> devices = getHidDevices();
+        for(HidDevice device : devices) {
+            if (device.isVidPidSerial(dOpts.getVendorId(), dOpts.getProductId(), dOpts.getSerial())
+                    && (dOpts.getUsagePage() == null || dOpts.getUsagePage() == device.getUsagePage())) {
+                return device;
+            }
+        }
+
+        return null;
+    }
+}