Add a testcase for testing %native

Examples/test-suite/common.mk

@@ -314,6 +314,7 @@ CPP_TEST_CASES += \
 	namespace_virtual_method \
 	nspace \
 	nspace_extend \
+	native_directive \
 	naturalvar \
 	naturalvar_more \
 	naturalvar_onoff \

Examples/test-suite/java/native_directive_runme.java

@@ -0,0 +1,22 @@
+import native_directive.*;
+
+public class native_directive_runme {
+
+  static {
+    try {
+	System.loadLibrary("native_directive");
+    } catch (UnsatisfiedLinkError e) {
+      System.err.println("Native code library failed to load. See the chapter on Dynamic Linking Problems in the SWIG Java documentation for help.\n" + e);
+      System.exit(1);
+    }
+  }
+
+  public static void main(String argv[]) {
+    String s = "abc.DEF-123";
+    if (native_directive.CountAlphas(s) != 6)
+      throw new RuntimeException("CountAlphas failed");
+    if (native_directive.CountAlphaCharacters(s) != 6)
+      throw new RuntimeException("CountAlphaCharacters failed");
+  }
+}
+

Examples/test-suite/native_directive.i

@@ -0,0 +1,43 @@
+%module native_directive
+
+%{
+#include <ctype.h>
+int alpha_count(const char *instring) {
+  int count = 0;
+  const char *s = instring;
+  while (s && *s) {
+    if (isalpha((int)*s))
+      count++;
+    s++;
+  };
+  return count;
+}
+%}
+
+%inline %{
+int CountAlphas(const char *instring) {
+  return alpha_count(instring);
+}
+%}
+
+// Languages that support %native should code up language specific implementations below
+
+#if defined(SWIGJAVA)
+%native(CountAlphaCharacters) int alpha_count(const char *inputString);
+%{
+extern "C" JNIEXPORT jint JNICALL Java_native_1directive_native_1directiveJNI_CountAlphaCharacters(JNIEnv *jenv, jclass jcls, jstring instring) {
+  jint jresult = 0 ;
+  (void)jcls;
+
+  if (instring) {
+    const char *s = (char *)jenv->GetStringUTFChars(instring, 0);
+    if (s) {
+      jresult = (jint)alpha_count(s);
+      jenv->ReleaseStringUTFChars(instring, s);
+    }
+  }
+  return jresult;
+}
+%}
+#endif
+