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/mma7455/javaupm_mma7455.i

@@ -3,29 +3,15 @@
 %include "typemaps.i"
 %include "arrays_java.i";
 %include "../java_buffer.i"
+%include "std_vector.i"
+
+%template(ShortVector) std::vector<short>;
 
 %apply short *OUTPUT { short * ptrX, short * ptrY, short * ptrZ };
 
-%typemap(jni) short* "jshortArray"
-%typemap(jstype) short* "short[]"
-%typemap(jtype) short* "short[]"
-
-%typemap(javaout) short* {
-    return $jnicall;
-}
-
-%typemap(out) short *readData {
-    $result = JCALL1(NewShortArray, jenv, 3);
-    JCALL4(SetShortArrayRegion, jenv, $result, 0, 3, (const signed short*)$1);
-    delete [] $1;
-}
-
-%ignore readData(short *, short *, short *);
-
 %{
-    #include "mma7455.hpp"
+#include "mma7455.hpp"
 %}
-
 %include "mma7455.hpp"
 
-JAVA_JNI_LOADLIBRARY(javaupm_mma7455)
+JAVA_JNI_LOADLIBRARY(javaupm_mma7455)

src/mma7455/mma7455.cxx

@@ -26,6 +26,7 @@
 #include <string>
 #include <stdexcept>
 #include <unistd.h>
+#include <vector>
 #include <stdlib.h>
 #include <string.h>
 #include <math.h>
@@ -133,13 +134,11 @@ MMA7455::readData (short * ptrX, short * ptrY, short * ptrZ) {
     return mraa::SUCCESS;
 }
 
-#ifdef SWIGJAVA
-short *MMA7455::readData() {
-    short *v = new short[3];
+std::vector<short> MMA7455::readData() {
+    std::vector<short> v(3);
     readData(&v[0], &v[1], &v[2]);
     return v;
 }
-#endif
 
 int
 MMA7455::i2cReadReg (unsigned char reg, uint8_t *buffer, int len) {

src/mma7455/mma7455.hpp

@@ -24,6 +24,7 @@
 #pragma once
 
 #include <string>
+#include <vector>
 #include <mraa/i2c.hpp>
 
 #define ADDR               0x1D // device address
@@ -208,14 +209,13 @@ class MMA7455 {
          */
         mraa::Result readData (short * ptrX, short * ptrY, short * ptrZ);
 
-#ifdef SWIGJAVA
         /**
          * Reads X-axis, Y-axis, and Z-axis acceleration data
          *
-         * @return Array containing X, Y, Z acceleration data
+         * @return std::vector containing X, Y, Z acceleration data
          */
-        short *readData ();
-#endif
+        std::vector<short> readData ();
+
         /**
          * Internal function for reading I2C data
          *