SWIGJAVA: Remove the last JAVA ifdefs from src

Removed all references to #ifdef SWIGJAVA and JAVACALLBACK from the
library source.  All java-specific source code has been moved to the
corresponding library's .i file for java.

    * Update library source
    * Update examples where necessary
    * The function pointer methodology has been remove from libraries
      which provided callbacks as both a class and a function pointer
      implementation.  Examples were updated to use the class version
      of callbacks.
    * Updated documentation for SWIGJAVA

Signed-off-by: Noel Eck <noel.eck@intel.com>

src/lsm9ds0/lsm9ds0.cxx

@@ -26,6 +26,7 @@
 #include <iostream>
 #include <stdexcept>
 #include <string.h>
+#include <vector>
 
 #include "lsm9ds0.hpp"
 
@@ -621,28 +622,26 @@ void LSM9DS0::getMagnetometer(float *x, float *y, float *z)
     *z = (m_magZ * m_magScale) / 1000.0;
 }
 
-#ifdef JAVACALLBACK
-float *LSM9DS0::getAccelerometer()
+std::vector<float> LSM9DS0::getAccelerometer()
 {
-  float *v = new float[3];
+  std::vector<float> v(3);
   getAccelerometer(&v[0], &v[1], &v[2]);
   return v;
 }
 
-float *LSM9DS0::getGyroscope()
+std::vector<float> LSM9DS0::getGyroscope()
 {
-  float *v = new float[3];
+  std::vector<float> v(3);
   getGyroscope(&v[0], &v[1], &v[2]);
   return v;
 }
 
-float *LSM9DS0::getMagnetometer()
+std::vector<float> LSM9DS0::getMagnetometer()
 {
-  float *v = new float[3];
+  std::vector<float> v(3);
   getMagnetometer(&v[0], &v[1], &v[2]);
   return v;
 }
-#endif
 
 float LSM9DS0::getTemperature()
 {

src/lsm9ds0/lsm9ds0.hpp

@@ -24,6 +24,7 @@
 #pragma once
 
 #include <string>
+#include <vector>
 #include <mraa/common.hpp>
 #include <mraa/i2c.hpp>
 
@@ -1266,28 +1267,26 @@ namespace upm {
      */
     void getMagnetometer(float *x, float *y, float *z);
 
-#if defined(SWIGJAVA) || defined(JAVACALLBACK)
     /**
      * get the accelerometer values in gravities
      *
-     * @return Array containing X, Y, Z acceleration values
+     * @return std::vector containing X, Y, Z acceleration values
      */
-    float *getAccelerometer();
+    std::vector<float> getAccelerometer();
 
     /**
      * get the gyroscope values in degrees per second
      *
-     * @return Array containing X, Y, Z gyroscope values
+     * @return std::vector containing X, Y, Z gyroscope values
      */
-    float *getGyroscope();
+    std::vector<float> getGyroscope();
 
     /**
      * get the magnetometer values in gauss
      *
-     * @return Array containing X, Y, Z magnetometer values
+     * @return std::vector containing X, Y, Z magnetometer values
      */
-    float *getMagnetometer();
-#endif
+    std::vector<float> getMagnetometer();
 
     /**
      * get the temperature value.  Unfortunately the datasheet does