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diff --git a/src/yajlpp/json_op.hh b/src/yajlpp/json_op.hh
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+/**
+ * Copyright (c) 2014, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY TIMOTHY STACK AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @file json_op.hh
+ */
+
+#ifndef json_op_hh
+#define json_op_hh
+
+#include <string>
+
+#include <sys/types.h>
+
+#include "yajl/api/yajl_parse.h"
+#include "yajlpp/json_ptr.hh"
+
+class json_op {
+    static int handle_null(void* ctx);
+    static int handle_boolean(void* ctx, int boolVal);
+    static int handle_number(void* ctx,
+                             const char* numberVal,
+                             size_t numberLen);
+    static int handle_string(void* ctx,
+                             const unsigned char* stringVal,
+                             size_t len);
+    static int handle_start_map(void* ctx);
+    static int handle_map_key(void* ctx, const unsigned char* key, size_t len);
+    static int handle_end_map(void* ctx);
+    static int handle_start_array(void* ctx);
+    static int handle_end_array(void* ctx);
+
+public:
+    const static yajl_callbacks gen_callbacks;
+    const static yajl_callbacks ptr_callbacks;
+
+    explicit json_op(const json_ptr& ptr)
+        : jo_ptr(ptr), jo_ptr_callbacks(gen_callbacks)
+    {
+    }
+
+    bool check_index(bool primitive = true)
+    {
+        return this->jo_ptr.at_index(
+            this->jo_depth, this->jo_array_index, primitive);
+    }
+
+    int jo_depth{0};
+    int jo_array_index{-1};
+
+    json_ptr jo_ptr;
+    yajl_callbacks jo_ptr_callbacks;
+    void* jo_ptr_data{nullptr};
+    std::string jo_ptr_error;
+    int jo_ptr_error_code{0};
+};
+
+#endif