an initial skeleton for building a Java binding to the C runtime

src/runtime/java/jpgf.c

@@ -0,0 +1,31 @@
+#include <pgf/pgf.h>
+#include <gu/mem.h>
+#include "org_grammaticalframework_PGF.h"
+
+JNIEXPORT jobject JNICALL 
+Java_org_grammaticalframework_PGF_readPGF(JNIEnv *env, jclass cls, jstring s)
+{
+	const char *fpath = (*env)->GetStringUTFChars(env, s, 0); 
+ 
+	GuPool* pool = gu_new_pool();
+	GuPool* tmp_pool = gu_local_pool();
+
+	// Create an exception frame that catches all errors.
+	GuExn* err = gu_new_exn(NULL, gu_kind(type), tmp_pool);
+
+	// Read the PGF grammar.
+	PgfPGF* pgf = pgf_read(fpath, pool, err);
+	if (!gu_ok(err)) {
+		gu_pool_free(pool);
+		gu_pool_free(tmp_pool);
+		return NULL;
+	}
+
+	gu_pool_free(tmp_pool);
+
+	(*env)->ReleaseStringUTFChars(env, s, fpath);
+
+	jmethodID constrId = (*env)->GetMethodID(env, cls, "<init>", "(II)V");
+
+	return (*env)->NewObject(env, cls, constrId, (int) pool, (int) pgf);
+}