From 63eee296c7c74deb26e2203205c57a662265992b Mon Sep 17 00:00:00 2001
From: Haohui Mai <wheat9@apache.org>
Date: Thu, 9 Jul 2015 13:47:20 -0700
Subject: [PATCH] HDFS-8745. Use Doxygen to generate documents for libhdfspp.
 Contributed by Haohui Mai.

---
 BUILDING.txt                                     |  2 ++
 .../src/main/native/libhdfspp/CMakeLists.txt     |  8 ++++++++
 .../src/main/native/libhdfspp/doc/Doxyfile.in    | 16 ++++++++++++++++
 .../src/main/native/libhdfspp/doc/mainpage.dox   |  8 ++++++++
 4 files changed, 34 insertions(+)
 create mode 100644 hadoop-hdfs-project/hadoop-hdfs-client/src/main/native/libhdfspp/doc/Doxyfile.in
 create mode 100644 hadoop-hdfs-project/hadoop-hdfs-client/src/main/native/libhdfspp/doc/mainpage.dox

diff --git a/BUILDING.txt b/BUILDING.txt
index 6d752d400fd..f1df1946e58 100644
--- a/BUILDING.txt
+++ b/BUILDING.txt
@@ -11,6 +11,8 @@ Requirements:
 * Zlib devel (if compiling native code)
 * openssl devel (if compiling native hadoop-pipes and to get the best HDFS encryption performance)
 * Linux FUSE (Filesystem in Userspace) version 2.6 or above (if compiling fuse_dfs)
+* Jansson C XML parsing library ( if compiling libwebhdfs )
+* Doxygen ( if compiling libhdfspp and generating the documents )
 * Internet connection for first build (to fetch all Maven and Hadoop dependencies)
 * python (for releasedocs)
 * bats (for shell code testing)
diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/native/libhdfspp/CMakeLists.txt b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/native/libhdfspp/CMakeLists.txt
index f4bc8b88c08..cae786cdfa3 100644
--- a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/native/libhdfspp/CMakeLists.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/native/libhdfspp/CMakeLists.txt
@@ -18,6 +18,7 @@
 
 project (libhdfspp)
 
+find_package(Doxygen)
 find_package(Protobuf REQUIRED)
 find_package(Threads)
 
@@ -33,6 +34,13 @@ if(APPLE)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++ -Wno-deprecated-declarations")
 endif()
 
+if(DOXYGEN_FOUND)
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/doc/Doxyfile.in ${CMAKE_CURRENT_BINARY_DIR}/doc/Doxyfile @ONLY)
+add_custom_target(doc ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/doc/Doxyfile
+                  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+                  COMMENT "Generating API documentation with Doxygen" VERBATIM)
+endif(DOXYGEN_FOUND)
+
 include_directories(
   include
   lib
diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/native/libhdfspp/doc/Doxyfile.in b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/native/libhdfspp/doc/Doxyfile.in
new file mode 100644
index 00000000000..773990f1c45
--- /dev/null
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/native/libhdfspp/doc/Doxyfile.in
@@ -0,0 +1,16 @@
+DOXYFILE_ENCODING      = UTF-8
+PROJECT_NAME           = "libhdfspp"
+OUTPUT_DIRECTORY       = doc
+TAB_SIZE               = 2
+MARKDOWN_SUPPORT       = YES
+BUILTIN_STL_SUPPORT    = YES
+
+
+INPUT                  = @PROJECT_SOURCE_DIR@/doc/mainpage.dox \
+                         @PROJECT_SOURCE_DIR@/include/libhdfspp \
+
+INPUT_ENCODING         = UTF-8
+RECURSIVE              = NO
+
+GENERATE_HTML          = YES
+GENERATE_LATEX         = NO
diff --git a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/native/libhdfspp/doc/mainpage.dox b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/native/libhdfspp/doc/mainpage.dox
new file mode 100644
index 00000000000..ef4ba26687e
--- /dev/null
+++ b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/native/libhdfspp/doc/mainpage.dox
@@ -0,0 +1,8 @@
+/**
+\mainpage libhdfs++
+
+libhdfs++ is a modern implementation of HDFS client in C++11. It is
+optimized for the Massive Parallel Processing (MPP) applications that
+access thousands of files concurrently in HDFS.
+
+*/