Adding iterator JNI binding

java/org/rocksdb/Iterator.java

@@ -0,0 +1,42 @@
+// Copyright (c) 2014, Facebook, Inc.  All rights reserved.
+// This source code is licensed under the BSD-style license found in the
+// LICENSE file in the root directory of this source tree. An additional grant
+// of patent rights can be found in the PATENTS file in the same directory.
+
+package org.rocksdb;
+
+public class Iterator {
+  private long nativeHandle_;
+  
+  public Iterator(long nativeHandle) {
+    nativeHandle_ = nativeHandle;
+  }
+  
+  public boolean isValid() {
+    assert(isInitialized());
+    return isValid0(nativeHandle_);
+  }
+  
+  public void seekToFirst() {
+    assert(isInitialized());
+    seekToFirst0(nativeHandle_);
+  }
+  
+  public synchronized void close() {
+    if(nativeHandle_ != 0) {
+      close0(nativeHandle_);
+    }
+  }
+  
+  @Override protected void finalize() {
+    close();
+  }
+  
+  private boolean isInitialized() {
+    return (nativeHandle_ != 0);
+  }
+  
+  private native boolean isValid0(long handle);
+  private native void close0(long handle);
+  private native void seekToFirst0(long handle);
+}

java/org/rocksdb/RocksDB.java

@@ -5,7 +5,6 @@
 
 package org.rocksdb;
 
-import java.util.*;
 import java.io.Closeable;
 import java.io.IOException;
 
@@ -136,6 +135,10 @@ public class RocksDB {
       throws RocksDBException {
     remove(nativeHandle_, writeOpt.nativeHandle_, key, key.length);
   }
+  
+  public Iterator iterator() {
+    return new Iterator(iterator0(nativeHandle_));
+  }
 
   @Override protected void finalize() {
     close();
@@ -170,6 +173,7 @@ public class RocksDB {
   protected native void remove(
       long handle, long writeOptHandle,
       byte[] key, int keyLen) throws RocksDBException;
+  protected native long iterator0(long optHandle);
   protected native void close0();
 
   protected long nativeHandle_;