Add NativeProblem that loads libeva2problem.jnilib if present.

closes #47

resources/NativeInterface/eva2_problems_NativeProblem.h

@@ -0,0 +1,31 @@
+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+/* Header for class eva2_problems_NativeProblem */
+
+#ifndef _Included_eva2_problems_NativeProblem
+#define _Included_eva2_problems_NativeProblem
+#ifdef __cplusplus
+extern "C" {
+#endif
+#undef eva2_problems_NativeProblem_serialVersionUID
+#define eva2_problems_NativeProblem_serialVersionUID -3904130243174390134LL
+/*
+ * Class:     eva2_problems_NativeProblem
+ * Method:    evaluate
+ * Signature: ([D)[D
+ */
+JNIEXPORT jdoubleArray JNICALL Java_eva2_problems_NativeProblem_evaluate
+  (JNIEnv *, jobject, jdoubleArray);
+
+/*
+ * Class:     eva2_problems_NativeProblem
+ * Method:    getName
+ * Signature: ()Ljava/lang/String;
+ */
+JNIEXPORT jstring JNICALL Java_eva2_problems_NativeProblem_getName
+  (JNIEnv *, jobject);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

resources/NativeInterface/eva2problem.c

@@ -0,0 +1,29 @@
+#include "eva2_problems_NativeProblem.h"
+
+JNIEXPORT jdoubleArray JNICALL Java_eva2_problems_NativeProblem_evaluate
+  (JNIEnv *env, jobject obj, jdoubleArray array) {
+  int i;
+  double result[1] = {0.0};
+  jdoubleArray resultArray = (*env)->NewDoubleArray(env, 1);
+  if (resultArray == NULL) {
+    return NULL; /* out of memory :( */
+  }
+  jsize len = (*env)->GetArrayLength(env, array);
+  jdouble *body = (*env)->GetDoubleArrayElements(env, array, 0);
+
+  // Calculate sum(x_i^2)
+  for(i=0; i<len; i++) {
+    result[0] += body[i] * body[i];
+  }
+
+  // Release input array
+  (*env)->ReleaseDoubleArrayElements(env, array, body, 0);
+  // Set result
+  (*env)->SetDoubleArrayRegion(env, resultArray, 0, 1, result);
+  return resultArray;
+}
+
+JNIEXPORT jstring JNICALL Java_eva2_problems_NativeProblem_getName
+  (JNIEnv *env, jobject obj) {
+  return (*env)->NewStringUTF(env, "Native Sphere");
+}

src/eva2/problems/NativeProblem.java

@@ -0,0 +1,27 @@
+package eva2.problems;
+
+/**
+ *
+ */
+public class NativeProblem extends AbstractProblemDouble {
+
+    private static boolean isLibraryLoaded = false;
+
+    public NativeProblem() {
+        if (!isLibraryLoaded) {
+            System.loadLibrary("eva2problem");
+        }
+        isLibraryLoaded = true;
+    }
+
+    @Override
+    public native double[] evaluate(double[] x);
+
+    @Override
+    public native String getName();
+
+    @Override
+    public Object clone() {
+        return this.clone();
+    }
+}