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Add support for java.nio.Buffer

including test-suite test case and documentation
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1 parent 287e84d commit 093fe2a556d242cf930e79348dcece3ec8c78e6f @yuvalk yuvalk committed Jul 18, 2014
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9 Doc/Manual/Java.html
@@ -5490,6 +5490,15 @@
<td>Use for mapping NULL terminated arrays of C strings to Java String arrays</td>
</tr>
+<tr>
+<td>unsigned char *</td>
+<td>NIOBUFFER</td>
+<td>various.i</td>
+<td>input<br> output</td>
+<td>java.nio.Buffer</td>
+<td>Use for mapping directly allocated buffers to c/c++. useful with directors and long lived memory objects</td>
+</tr>
+
</table>
<H3><a name="Java_typemap_attributes"></a>25.9.6 Java typemap attributes</H3>
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19 Examples/test-suite/java/java_lib_various_runme.java
@@ -83,6 +83,25 @@ public static void main(String argv[]) {
if (byjove[i] != b[i])
throw new RuntimeException("By jove, it failed: [" + new String(b) + "]");
}
+
+ // NIOBUFFER typemap check
+ java.nio.ByteBuffer buf = java.nio.ByteBuffer.allocateDirect(10);
+ java_lib_various.niobuffer_fill_hello(buf);
+ if (
+ (char)buf.get(0) != 'h' ||
+ (char)buf.get(1) != 'e' ||
+ (char)buf.get(2) != 'l' ||
+ (char)buf.get(3) != 'l' ||
+ (char)buf.get(4) != 'o'
+ )
+ throw new RuntimeException(
+ "nio test failed: " +
+ (char)buf.get(0) +
+ (char)buf.get(1) +
+ (char)buf.get(2) +
+ (char)buf.get(3) +
+ (char)buf.get(4)
+ );
}
}
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4 Examples/test-suite/java_lib_various.i
@@ -8,6 +8,7 @@
%apply char **STRING_ARRAY { char **languages };
%apply char *BYTE { char *chars };
%apply char **STRING_OUT { char **string_ptr };
+%apply unsigned char *NIOBUFFER { unsigned char *buf };
%typemap(freearg) char **languages "" // don't delete memory when setting global variable
%{
@@ -47,5 +48,8 @@ void char_ptr_ptr_out(char **string_ptr) {
*string_ptr = ret;
}
+void niobuffer_fill_hello(unsigned char *buf) {
+ sprintf ((char*)buf,"hello");
+}
%}
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37 Lib/java/various.i
@@ -154,3 +154,40 @@
/* Prevent default freearg typemap from being used */
%typemap(freearg) char *BYTE ""
+/*
+ * unsigned char *NIOBUFFER typemaps.
+ * This is for mapping java nio buffers to c char array. it is useful for long standing pointers for callbacks
+ * and wherever performance is critical (and thus memory copy + marshaling is a burdon)
+ * Note: The Java buffer have to be allocated with allocateDirect.
+ *
+ * Example usage wrapping:
+ * void foo(unsigned char *buf);
+ *
+ * Java usage:
+ * byte b[] = new byte[20]A;
+ * java.nio.ByteBuffer b = ByteBuffer.allocateDirect(<size>);
+ * modulename.foo(b);
+ */
+%typemap(jni) unsigned char *NIOBUFFER "jobject"
+%typemap(jtype) unsigned char *NIOBUFFER "java.nio.ByteBuffer"
+%typemap(jstype) unsigned char *NIOBUFFER "java.nio.ByteBuffer"
+%typemap(javain,
+ pre=" assert $javainput.isDirect() : \"Buffer must be allocated direct.\";") unsigned char *NIOBUFFER "$javainput"
+%typemap(javaout) unsigned char *NIOBUFFER {
+ return $jnicall;
+}
+%typemap(in) unsigned char *NIOBUFFER {
+ $1 = (unsigned char *) JCALL1(GetDirectBufferAddress, jenv, $input);
+ if ($1 == NULL) {
+ SWIG_JavaThrowException(jenv, SWIG_JavaRuntimeException, "Unable to get address of direct buffer. Buffer must be allocated direct.");
+ }
+}
+%typemap(memberin) unsigned char *NIOBUFFER {
+ if ($input) {
+ $1 = $input;
+ } else {
+ $1 = 0;
+ }
+}
+%typemap(freearg) unsigned char *NIOBUFFER ""
+//define end

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