java: fix Java return type for readData in MMA7455

Signed-off-by: Petre <petre.p.eftime@intel.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/mma7455/javaupm_mma7455.i

@@ -10,4 +10,20 @@
     #include "mma7455.h"
 %}
 
+%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.h"

src/mma7455/mma7455.cxx

@@ -137,6 +137,14 @@ MMA7455::readData (short * ptrX, short * ptrY, short * ptrZ) {
     return MRAA_SUCCESS;
 }
 
+#ifdef SWIGJAVA
+short *MMA7455::readData() {
+    short *v = new short[3];
+    readData(&v[0], &v[1], &v[2]);
+    return v;
+}
+#endif
+
 int
 MMA7455::ic2ReadReg (unsigned char reg, unsigned char * buf, unsigned char size) {
     if (MRAA_SUCCESS != mraa_i2c_address(m_i2ControlCtx, m_controlAddr)) {

src/mma7455/mma7455.h

@@ -206,6 +206,15 @@ class MMA7455 {
          */
         mraa_result_t 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
+         */
+        short *readData ();
+#endif
+
         /**
          *
          *