Add more iterator JNI bindings

java/rocksjni/iterator.cc

@@ -54,6 +54,63 @@ void Java_org_rocksdb_Iterator_prev0(
   st->Prev();
 }
 
+jbyteArray Java_org_rocksdb_Iterator_key0(
+    JNIEnv* env, jobject jobj, jlong handle) {
+  auto st = reinterpret_cast<rocksdb::Iterator*>(handle);
+  assert(st != nullptr);
+  
+  rocksdb::Slice key_slice = st->key();
+  
+  jbyteArray jkey = env->NewByteArray(key_slice.size());
+    env->SetByteArrayRegion(
+        jkey, 0, key_slice.size(),
+        reinterpret_cast<const jbyte*>(key_slice.data()));
+  return jkey;
+}
+
+jbyteArray Java_org_rocksdb_Iterator_value0(
+    JNIEnv* env, jobject jobj, jlong handle) {
+  auto st = reinterpret_cast<rocksdb::Iterator*>(handle);
+  assert(st != nullptr);
+  
+  rocksdb::Slice value_slice = st->value();
+  
+  jbyteArray jvalue = env->NewByteArray(value_slice.size());
+    env->SetByteArrayRegion(
+        jvalue, 0, value_slice.size(),
+        reinterpret_cast<const jbyte*>(value_slice.data()));
+  return jvalue;
+}
+
+void Java_org_rocksdb_Iterator_seek0(
+    JNIEnv* env, jobject jobj, jlong handle,
+    jbyteArray jtarget, jint jtarget_len) {
+  auto st = reinterpret_cast<rocksdb::Iterator*>(handle);
+  assert(st != nullptr);
+  
+  jbyte* target = env->GetByteArrayElements(jtarget, 0);
+  rocksdb::Slice target_slice(
+      reinterpret_cast<char*>(target), jtarget_len);
+  
+  st->Seek(target_slice);
+  
+  env->ReleaseByteArrayElements(jtarget, target, JNI_ABORT);
+}
+
+void Java_org_rocksdb_Iterator_status0(
+    JNIEnv* env, jobject jobj, jlong handle) {
+  auto st = reinterpret_cast<rocksdb::Iterator*>(handle);
+  assert(st != nullptr);
+  
+  rocksdb::Status s = st->status();
+  
+  if (s.ok()) {
+    return;
+  }
+  
+  rocksdb::RocksDBExceptionJni::ThrowNew(env, s);
+}
+
 void Java_org_rocksdb_Iterator_close0(
     JNIEnv* env, jobject jobj, jlong handle) {
   auto st = reinterpret_cast<rocksdb::Iterator*>(handle);