wt5001: Added functions that throw exceptions when failing to read from sensors. Added java exception handling, and modified examples.

Signed-off-by: Stefan Andritoiu <stefan.andritoiu@intel.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/java_exceptions.i

@@ -0,0 +1,21 @@
+/* -----------------------------------------------------------------------------
+ * java_exceptions.i
+ *
+ * SWIG library file providing java-specific exception handling in the upm library
+ * ----------------------------------------------------------------------------- */
+
+/*
+ * Use this macro for functions that read data from a sensor and throw a 
+ * std::runtime_error in case of a read failure
+*/
+%define READDATA_EXCEPTION(function)
+%javaexception("java.io.IOException") function {
+  try {
+     $action
+  } catch (std::runtime_error &e) {
+    jclass clazz = jenv->FindClass("java/io/IOException");
+    jenv->ThrowNew(clazz, e.what());
+    return $null;
+   }
+}
+%enddef