From eda398491a19ae02ffb304e2686514c171a603c5 Mon Sep 17 00:00:00 2001
From: Ankit Gupta <aigupta@linkedin.com>
Date: Sat, 19 Apr 2014 03:35:01 -0700
Subject: [PATCH] Add more iterator functions

---
 java/RocksDBSample.java        |  3 +++
 java/org/rocksdb/Iterator.java | 18 ++++++++++++++++++
 java/rocksjni/iterator.cc      | 24 ++++++++++++++++++++++++
 3 files changed, 45 insertions(+)

diff --git a/java/RocksDBSample.java b/java/RocksDBSample.java
index f4afe79cf..018d86815 100644
--- a/java/RocksDBSample.java
+++ b/java/RocksDBSample.java
@@ -145,6 +145,9 @@ public class RocksDBSample {
       Iterator iterator = db.iterator();
       iterator.seekToFirst();
       assert(iterator.isValid());
+      iterator.next();
+      iterator.seekToLast();
+      iterator.prev();
       iterator.close();      
     } catch (RocksDBException e) {
       System.err.println(e);
diff --git a/java/org/rocksdb/Iterator.java b/java/org/rocksdb/Iterator.java
index 945514230..dbd11015b 100644
--- a/java/org/rocksdb/Iterator.java
+++ b/java/org/rocksdb/Iterator.java
@@ -22,6 +22,21 @@ public class Iterator {
     seekToFirst0(nativeHandle_);
   }
   
+  public void seekToLast() {
+    assert(isInitialized());
+    seekToLast0(nativeHandle_);
+  }
+  
+  public void next() {
+    assert(isInitialized());
+    next0(nativeHandle_);
+  }
+  
+  public void prev() {
+    assert(isInitialized());
+    prev0(nativeHandle_);
+  }
+  
   public synchronized void close() {
     if(nativeHandle_ != 0) {
       close0(nativeHandle_);
@@ -39,4 +54,7 @@ public class Iterator {
   private native boolean isValid0(long handle);
   private native void close0(long handle);
   private native void seekToFirst0(long handle);
+  private native void seekToLast0(long handle);
+  private native void next0(long handle);
+  private native void prev0(long handle);
 }
\ No newline at end of file
diff --git a/java/rocksjni/iterator.cc b/java/rocksjni/iterator.cc
index 9f6edd0ee..2f6d0a6b3 100644
--- a/java/rocksjni/iterator.cc
+++ b/java/rocksjni/iterator.cc
@@ -30,6 +30,30 @@ void Java_org_rocksdb_Iterator_seekToFirst0(
   st->SeekToFirst();
 }
 
+void Java_org_rocksdb_Iterator_seekToLast0(
+    JNIEnv* env, jobject jobj, jlong handle) {
+  auto st = reinterpret_cast<rocksdb::Iterator*>(handle);
+  assert(st != nullptr);
+  
+  st->SeekToLast();
+}
+
+void Java_org_rocksdb_Iterator_next0(
+    JNIEnv* env, jobject jobj, jlong handle) {
+  auto st = reinterpret_cast<rocksdb::Iterator*>(handle);
+  assert(st != nullptr);
+  
+  st->Next();
+}
+
+void Java_org_rocksdb_Iterator_prev0(
+    JNIEnv* env, jobject jobj, jlong handle) {
+  auto st = reinterpret_cast<rocksdb::Iterator*>(handle);
+  assert(st != nullptr);
+  
+  st->Prev();
+}
+
 void Java_org_rocksdb_Iterator_close0(
     JNIEnv* env, jobject jobj, jlong handle) {
   auto st = reinterpret_cast<rocksdb::Iterator*>(handle);