CMake/Modules/FindJNI.cmake

# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#[=======================================================================[.rst:
FindJNI
-------

Find Java Native Interface (JNI) headers and libraries.

JNI enables Java code running in a Java Virtual Machine (JVM) or Dalvik Virtual
Machine (DVM) on Android to call and be called by native applications and
libraries written in other languages such as C and C++.

This module finds if Java is installed and determines where the
include files and libraries are.  It also determines what the name of
the library is.  The caller may set variable ``JAVA_HOME`` to specify a
Java installation prefix explicitly.

.. versionadded:: 3.24

  Added imported targets, components ``AWT``, ``JVM``, and Android NDK support.
  If no components are specified, the module defaults to an empty components
  list while targeting Android, and all available components otherwise.

  When using Android NDK, the corresponding package version is reported and a
  specific release can be requested. At Android API level 31 and above, the
  additional ``NativeHelper`` component can be requested. ``NativeHelper`` is
  also exposed as an implicit dependency of the ``JVM`` component (only if this
  does not cause a conflict) which provides a uniform access to JVM functions.

Imported Targets
^^^^^^^^^^^^^^^^

.. versionadded:: 3.24

``JNI::JNI``
  Main JNI target, defined only if ``jni.h`` was found.

``JNI::AWT``
  Java AWT Native Interface (JAWT) library, defined only if component ``AWT`` was
  found.

``JNI::JVM``
  Java Virtual Machine (JVM) library, defined only if component ``JVM`` was found.

``JNI::NativeHelper``
  When targeting Android API level 31 and above, the import target will provide
  access to ``libnativehelper.so`` that exposes JVM functions such as
  ``JNI_CreateJavaVM``.

Result Variables
^^^^^^^^^^^^^^^^

This module sets the following result variables:

``JNI_INCLUDE_DIRS``
  The include directories to use.
``JNI_LIBRARIES``
  The libraries to use (JAWT and JVM).
``JNI_FOUND``
  ``TRUE`` if JNI headers and libraries were found.
``JNI_<component>_FOUND``
  .. versionadded:: 3.24

  ``TRUE`` if ``<component>`` was found.
``JNI_VERSION``
  Full Android NDK package version (including suffixes such as ``-beta3`` and
  ``-rc1``) or undefined otherwise.
``JNI_VERSION_MAJOR``
  .. versionadded:: 3.24

  Android NDK major version or undefined otherwise.
``JNI_VERSION_MINOR``
  .. versionadded:: 3.24

  Android NDK minor version or undefined otherwise.
``JNI_VERSION_PATCH``
  .. versionadded:: 3.24

  Android NDK patch version or undefined otherwise.

Cache Variables
^^^^^^^^^^^^^^^

The following cache variables are also available to set or use:

``JAVA_AWT_LIBRARY``
  The path to the Java AWT Native Interface (JAWT) library.
``JAVA_JVM_LIBRARY``
  The path to the Java Virtual Machine (JVM) library.
``JAVA_INCLUDE_PATH``
  The include path to ``jni.h``.
``JAVA_INCLUDE_PATH2``
  The include path to machine-dependant headers ``jni_md.h`` and ``jniport.h``.
  The variable is defined only if ``jni.h`` depends on one of these headers. In
  contrast, Android NDK ``jni.h`` can be typically used standalone.
``JAVA_AWT_INCLUDE_PATH``
  The include path to ``jawt.h``.
#]=======================================================================]

cmake_policy(PUSH)
cmake_policy(SET CMP0057 NEW)

include(CheckSourceCompiles)
include(CMakePushCheckState)
include(FindPackageHandleStandardArgs)

if(NOT JNI_FIND_COMPONENTS)
  if(ANDROID)
    if(CMAKE_SYSTEM_VERSION LESS 31)
      # There are no components for Android NDK
      set(JNI_FIND_COMPONENTS)
    else()
      set(JNI_FIND_COMPONENTS NativeHelper)
      set(JNI_FIND_REQUIRED_NativeHelper TRUE)
    endif()
  else(ANDROID)
    set(JNI_FIND_COMPONENTS AWT JVM)
    # For compatibility purposes, if no components are specified both are
    # considered required.
    set(JNI_FIND_REQUIRED_AWT TRUE)
    set(JNI_FIND_REQUIRED_JVM TRUE)
  endif()
else()
  # On Android, if JVM was requested we need to find NativeHelper as well which
  # is an implicit dependency of JVM allowing to provide uniform access to basic
  # JVM/DVM functionality.
  if(ANDROID AND CMAKE_SYSTEM_VERSION GREATER_EQUAL 31 AND JVM IN_LIST JNI_FIND_COMPONENTS)
    if(NOT NativeHelper IN_LIST JNI_FIND_COMPONENTS)
      list(APPEND JNI_FIND_COMPONENTS NativeHelper)
      # NativeHelper is required only if JVM was requested as such.
      set(JNI_FIND_REQUIRED_NativeHelper ${JNI_FIND_REQUIRED_JVM})
    endif()
  endif()
endif()

# Expand {libarch} occurrences to java_libarch subdirectory(-ies) and set ${_var}
macro(java_append_library_directories _var)
    # Determine java arch-specific library subdir
    # Mostly based on openjdk/jdk/make/common/shared/Platform.gmk as of openjdk
    # 1.6.0_18 + icedtea patches. However, it would be much better to base the
    # guess on the first part of the GNU config.guess platform triplet.
    if(CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64")
      if(CMAKE_LIBRARY_ARCHITECTURE STREQUAL "x86_64-linux-gnux32")
        set(_java_libarch "x32" "amd64" "i386")
      else()
        set(_java_libarch "amd64" "i386")
      endif()
    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^i.86$")
        set(_java_libarch "i386")
    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^aarch64")
        set(_java_libarch "arm64" "aarch64")
    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^alpha")
        set(_java_libarch "alpha")
    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm")
        # Subdir is "arm" for both big-endian (arm) and little-endian (armel).
        set(_java_libarch "arm" "aarch32")
    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^mips")
        # mips* machines are bi-endian mostly so processor does not tell
        # endianness of the underlying system.
        set(_java_libarch "${CMAKE_SYSTEM_PROCESSOR}"
            "mips" "mipsel" "mipseb" "mipsr6" "mipsr6el"
            "mips64" "mips64el" "mips64r6" "mips64r6el"
            "mipsn32" "mipsn32el" "mipsn32r6" "mipsn32r6el")
    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64le")
        set(_java_libarch "ppc64" "ppc64le")
    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64")
        set(_java_libarch "ppc64" "ppc")
    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)")
        set(_java_libarch "ppc" "ppc64")
    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^sparc")
        # Both flavors can run on the same processor
        set(_java_libarch "${CMAKE_SYSTEM_PROCESSOR}" "sparc" "sparcv9")
    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(parisc|hppa)")
        set(_java_libarch "parisc" "parisc64")
    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^s390")
        # s390 binaries can run on s390x machines
        set(_java_libarch "${CMAKE_SYSTEM_PROCESSOR}" "s390" "s390x")
    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^sh")
        set(_java_libarch "sh")
    else()
        set(_java_libarch "${CMAKE_SYSTEM_PROCESSOR}")
    endif()

    # Append default list architectures if CMAKE_SYSTEM_PROCESSOR was empty or
    # system is non-Linux (where the code above has not been well tested)
    if(NOT _java_libarch OR NOT (CMAKE_SYSTEM_NAME MATCHES "Linux"))
        list(APPEND _java_libarch "i386" "amd64" "ppc")
    endif()

    # Sometimes ${CMAKE_SYSTEM_PROCESSOR} is added to the list to prefer
    # current value to a hardcoded list. Remove possible duplicates.
    list(REMOVE_DUPLICATES _java_libarch)

    foreach(_path ${ARGN})
        if(_path MATCHES "{libarch}")
            foreach(_libarch ${_java_libarch})
                string(REPLACE "{libarch}" "${_libarch}" _newpath "${_path}")
                if(EXISTS ${_newpath})
                    list(APPEND ${_var} "${_newpath}")
                endif()
            endforeach()
        else()
            if(EXISTS ${_path})
                list(APPEND ${_var} "${_path}")
            endif()
        endif()
    endforeach()
endmacro()

include(${CMAKE_CURRENT_LIST_DIR}/CMakeFindJavaCommon.cmake)

# Save CMAKE_FIND_FRAMEWORK
if(DEFINED CMAKE_FIND_FRAMEWORK)
  set(_JNI_CMAKE_FIND_FRAMEWORK ${CMAKE_FIND_FRAMEWORK})
else()
  unset(_JNI_CMAKE_FIND_FRAMEWORK)
endif()

if(_JAVA_HOME_EXPLICIT)
  set(CMAKE_FIND_FRAMEWORK NEVER)
endif()

set(JAVA_AWT_LIBRARY_DIRECTORIES)
if(_JAVA_HOME)
  JAVA_APPEND_LIBRARY_DIRECTORIES(JAVA_AWT_LIBRARY_DIRECTORIES
    ${_JAVA_HOME}/jre/lib/{libarch}
    ${_JAVA_HOME}/jre/lib
    ${_JAVA_HOME}/lib/{libarch}
    ${_JAVA_HOME}/lib
    ${_JAVA_HOME}
    )
endif()

if (WIN32)
  set (_JNI_HINTS)
  macro (_JNI_GET_INSTALLED_VERSIONS _KIND)
    execute_process(COMMAND REG QUERY "HKLM\\SOFTWARE\\JavaSoft\\${_KIND}"
      RESULT_VARIABLE _JAVA_RESULT
      OUTPUT_VARIABLE _JAVA_VERSIONS
      ERROR_QUIET)
    if (NOT  _JAVA_RESULT)
      string (REGEX MATCHALL "HKEY_LOCAL_MACHINE\\\\SOFTWARE\\\\JavaSoft\\\\${_KIND}\\\\[0-9._]+" _JNI_VERSIONS "${_JAVA_VERSIONS}")
      string (REGEX REPLACE "HKEY_LOCAL_MACHINE\\\\SOFTWARE\\\\JavaSoft\\\\${_KIND}\\\\([0-9._]+)" "\\1" _JNI_VERSIONS "${_JNI_VERSIONS}")
      if (_JNI_VERSIONS)
        # sort versions. Most recent first
        list (SORT _JNI_VERSIONS COMPARE NATURAL ORDER DESCENDING)
        foreach (_JNI_VERSION IN LISTS _JNI_VERSIONS)
          string(REPLACE "_" "." _JNI_CMAKE_VERSION "${_JNI_VERSION}")
          if (JNI_FIND_VERSION_EXACT
              AND NOT _JNI_CMAKE_VERSION MATCHES "^${JNI_FIND_VERSION}")
            continue()
          endif()
          if (DEFINED JNI_FIND_VERSION AND _JNI_CMAKE_VERSION VERSION_LESS JNI_FIND_VERSION)
            break()
          endif()
          list(APPEND _JNI_HINTS "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\${_KIND}\\${_JNI_VERSION};JavaHome]")
        endforeach()
      endif()
    endif()
  endmacro()

    # for version 9 and upper
  _JNI_GET_INSTALLED_VERSIONS("JDK")

  # for versions older than 9
  _JNI_GET_INSTALLED_VERSIONS("Java Development Kit")

  foreach (_JNI_HINT IN LISTS _JNI_HINTS)
    list(APPEND JAVA_AWT_LIBRARY_DIRECTORIES "${_JNI_HINT}/lib")
  endforeach()
endif()

set(_JNI_JAVA_DIRECTORIES_BASE
  /usr/lib/jvm/java
  /usr/lib/java
  /usr/lib/jvm
  /usr/local/lib/java
  /usr/local/share/java
  /usr/lib/j2sdk1.4-sun
  /usr/lib/j2sdk1.5-sun
  /opt/sun-jdk-1.5.0.04
  /usr/lib/jvm/java-6-sun
  /usr/lib/jvm/java-1.5.0-sun
  /usr/lib/jvm/java-6-sun-1.6.0.00       # can this one be removed according to #8821 ? Alex
  /usr/lib/jvm/java-6-openjdk
  /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0        # fedora
  # Debian specific paths for default JVM
  /usr/lib/jvm/default-java
  # Arch Linux specific paths for default JVM
  /usr/lib/jvm/default
  # Ubuntu specific paths for default JVM
  /usr/lib/jvm/java-21-openjdk-{libarch}    # Ubuntu 23.04
  /usr/lib/jvm/java-20-openjdk-{libarch}    # Ubuntu 22.10
  /usr/lib/jvm/java-19-openjdk-{libarch}    # Ubuntu 22.04 LTS
  /usr/lib/jvm/java-18-openjdk-{libarch}    # Ubuntu 22.04 LTS
  /usr/lib/jvm/java-17-openjdk-{libarch}    # Ubuntu 18.04 LTS
  /usr/lib/jvm/java-16-openjdk-{libarch}    # Ubuntu 20.04 LTS
  /usr/lib/jvm/java-13-openjdk-{libarch}    # Ubuntu 20.04 LTS
  /usr/lib/jvm/java-11-openjdk-{libarch}    # Ubuntu 18.04 LTS
  /usr/lib/jvm/java-8-openjdk-{libarch}     # Ubuntu 15.10
  /usr/lib/jvm/java-7-openjdk-{libarch}     # Ubuntu 15.10
  /usr/lib/jvm/java-6-openjdk-{libarch}     # Ubuntu 15.10
  # OpenBSD specific paths for default JVM
  /usr/local/jdk-1.7.0
  /usr/local/jre-1.7.0
  /usr/local/jdk-1.6.0
  /usr/local/jre-1.6.0
  # FreeBSD specific paths for default JVM
  /usr/local/openjdk15
  /usr/local/openjdk14
  /usr/local/openjdk13
  /usr/local/openjdk12
  /usr/local/openjdk11
  /usr/local/openjdk8
  /usr/local/openjdk7
  # SuSE specific paths for default JVM
  /usr/lib64/jvm/java
  /usr/lib64/jvm/jre
  )

set(_JNI_JAVA_AWT_LIBRARY_TRIES)
set(_JNI_JAVA_INCLUDE_TRIES)

foreach(_java_dir IN LISTS _JNI_JAVA_DIRECTORIES_BASE)
  list(APPEND _JNI_JAVA_AWT_LIBRARY_TRIES
    ${_java_dir}/jre/lib/{libarch}
    ${_java_dir}/jre/lib
    ${_java_dir}/lib/{libarch}
    ${_java_dir}/lib
    ${_java_dir}
  )
  list(APPEND _JNI_JAVA_INCLUDE_TRIES
    ${_java_dir}/include
  )
endforeach()

JAVA_APPEND_LIBRARY_DIRECTORIES(JAVA_AWT_LIBRARY_DIRECTORIES
    ${_JNI_JAVA_AWT_LIBRARY_TRIES}
  )

set(JAVA_JVM_LIBRARY_DIRECTORIES)
foreach(dir ${JAVA_AWT_LIBRARY_DIRECTORIES})
  list(APPEND JAVA_JVM_LIBRARY_DIRECTORIES
    "${dir}"
    "${dir}/client"
    "${dir}/server"
    # IBM SDK, Java Technology Edition, specific paths
    "${dir}/j9vm"
    "${dir}/default"
    )
endforeach()

set(JAVA_AWT_INCLUDE_DIRECTORIES)
if(_JAVA_HOME)
  list(APPEND JAVA_AWT_INCLUDE_DIRECTORIES ${_JAVA_HOME}/include)
endif()
if (WIN32)
  foreach (_JNI_HINT IN LISTS _JNI_HINTS)
    list(APPEND JAVA_AWT_INCLUDE_DIRECTORIES "${_JNI_HINT}/include")
  endforeach()
endif()

JAVA_APPEND_LIBRARY_DIRECTORIES(JAVA_AWT_INCLUDE_DIRECTORIES
  ${_JNI_JAVA_INCLUDE_TRIES}
  )

foreach(JAVA_PROG "${JAVA_RUNTIME}" "${JAVA_COMPILE}" "${JAVA_ARCHIVE}")
  get_filename_component(jpath "${JAVA_PROG}" PATH)
  foreach(JAVA_INC_PATH ../include ../java/include ../share/java/include)
    if(EXISTS ${jpath}/${JAVA_INC_PATH})
      list(APPEND JAVA_AWT_INCLUDE_DIRECTORIES "${jpath}/${JAVA_INC_PATH}")
    endif()
  endforeach()
  foreach(JAVA_LIB_PATH
    ../lib ../jre/lib ../jre/lib/i386
    ../java/lib ../java/jre/lib ../java/jre/lib/i386
    ../share/java/lib ../share/java/jre/lib ../share/java/jre/lib/i386)
    if(EXISTS ${jpath}/${JAVA_LIB_PATH})
      list(APPEND JAVA_AWT_LIBRARY_DIRECTORIES "${jpath}/${JAVA_LIB_PATH}")
    endif()
  endforeach()
endforeach()

if(APPLE)
  if(DEFINED XCODE_VERSION)
    set(_FindJNI_XCODE_VERSION "${XCODE_VERSION}")
  else()
    # get xcode version
    execute_process(
          COMMAND xcodebuild -version
          OUTPUT_VARIABLE _xcode_version
          )
    string(REGEX REPLACE "Xcode ([0-9]+(\\.[0-9]+)*)" "\\1" _FindJNI_XCODE_VERSION ${_xcode_version})
    unset(_xcode_version)
  endif()

  if(_FindJNI_XCODE_VERSION VERSION_GREATER 12.1)
    set(CMAKE_FIND_FRAMEWORK "NEVER")
  endif()
  unset(_FindJNI_XCODE_VERSION)

  if(CMAKE_FIND_FRAMEWORK STREQUAL "ONLY")
    set(_JNI_SEARCHES FRAMEWORK)
  elseif(CMAKE_FIND_FRAMEWORK STREQUAL "NEVER")
    set(_JNI_SEARCHES NORMAL)
  elseif(CMAKE_FIND_FRAMEWORK STREQUAL "LAST")
    set(_JNI_SEARCHES NORMAL FRAMEWORK)
  else()
    set(_JNI_SEARCHES FRAMEWORK NORMAL)
  endif()
  set(_JNI_FRAMEWORK_JVM NAMES JavaVM)
  set(_JNI_FRAMEWORK_JAWT "${_JNI_FRAMEWORK_JVM}")
else()
  set(_JNI_SEARCHES NORMAL)
endif()

set(_JNI_NORMAL_JVM
  NAMES jvm
  PATHS ${JAVA_JVM_LIBRARY_DIRECTORIES}
  )

set(_JNI_NORMAL_JAWT
  NAMES jawt
  PATHS ${JAVA_AWT_LIBRARY_DIRECTORIES}
  )

foreach(search ${_JNI_SEARCHES})
  if(JVM IN_LIST JNI_FIND_COMPONENTS)
    find_library(JAVA_JVM_LIBRARY ${_JNI_${search}_JVM}
      DOC "Java Virtual Machine library"
    )
  endif(JVM IN_LIST JNI_FIND_COMPONENTS)

  if(AWT IN_LIST JNI_FIND_COMPONENTS)
    find_library(JAVA_AWT_LIBRARY ${_JNI_${search}_JAWT}
      DOC "Java AWT Native Interface library"
    )
    if(JAVA_JVM_LIBRARY)
      break()
    endif()
  endif()
endforeach()
unset(_JNI_SEARCHES)
unset(_JNI_FRAMEWORK_JVM)
unset(_JNI_FRAMEWORK_JAWT)
unset(_JNI_NORMAL_JVM)
unset(_JNI_NORMAL_JAWT)

# Find headers matching the library.
if("${JAVA_JVM_LIBRARY};${JAVA_AWT_LIBRARY};" MATCHES "(/JavaVM.framework|-framework JavaVM);")
  set(CMAKE_FIND_FRAMEWORK ONLY)
else()
  set(CMAKE_FIND_FRAMEWORK NEVER)
endif()

# add in the include path
find_path(JAVA_INCLUDE_PATH jni.h
  ${JAVA_AWT_INCLUDE_DIRECTORIES}
  DOC "JNI include directory"
)

if(JAVA_INCLUDE_PATH)
  if(CMAKE_C_COMPILER_LOADED)
    set(_JNI_CHECK_LANG C)
  elseif(CMAKE_CXX_COMPILER_LOADED)
    set(_JNI_CHECK_LANG CXX)
  else()
    set(_JNI_CHECK_LANG FALSE)
  endif()

  # Skip the check if neither C nor CXX is loaded.
  if(_JNI_CHECK_LANG)
    cmake_push_check_state(RESET)
    # The result of the following check is not relevant for the user as
    # JAVA_INCLUDE_PATH2 will be added to REQUIRED_VARS if necessary.
    set(CMAKE_REQUIRED_QUIET ON)
    set(CMAKE_REQUIRED_INCLUDES ${JAVA_INCLUDE_PATH})

    # Determine whether jni.h requires jni_md.h and add JAVA_INCLUDE_PATH2
    # correspondingly to REQUIRED_VARS
    check_source_compiles(${_JNI_CHECK_LANG}
"
#include <jni.h>
int main(void) { return 0; }
"
      JNI_INCLUDE_PATH2_OPTIONAL)

    cmake_pop_check_state()
  else()
    # If the above check is skipped assume jni_md.h is not needed.
    set(JNI_INCLUDE_PATH2_OPTIONAL TRUE)
  endif()

  unset(_JNI_CHECK_LANG)
endif()

find_path(JAVA_INCLUDE_PATH2 NAMES jni_md.h jniport.h
  PATHS ${JAVA_INCLUDE_PATH}
  ${JAVA_INCLUDE_PATH}/darwin
  ${JAVA_INCLUDE_PATH}/win32
  ${JAVA_INCLUDE_PATH}/linux
  ${JAVA_INCLUDE_PATH}/freebsd
  ${JAVA_INCLUDE_PATH}/openbsd
  ${JAVA_INCLUDE_PATH}/solaris
  ${JAVA_INCLUDE_PATH}/hp-ux
  ${JAVA_INCLUDE_PATH}/alpha
  ${JAVA_INCLUDE_PATH}/aix
  DOC "jni_md.h jniport.h include directory"
)

if(AWT IN_LIST JNI_FIND_COMPONENTS)
  find_path(JAVA_AWT_INCLUDE_PATH jawt.h
    ${JAVA_INCLUDE_PATH}
    DOC "Java AWT Native Interface include directory"
  )
endif()

if(ANDROID)
  # Some functions in jni.h (e.g., JNI_GetCreatedJavaVMs) are exported by
  # libnativehelper.so, however, only when targeting Android API level >= 31.
  find_library(JAVA_NativeHelper_LIBRARY NAMES nativehelper
    DOC "Android nativehelper library"
  )
endif()

# Set found components
if(JAVA_AWT_INCLUDE_PATH AND JAVA_AWT_LIBRARY)
  set(JNI_AWT_FOUND TRUE)
else()
  set(JNI_AWT_FOUND FALSE)
endif()

# JVM is available even on Android referencing the nativehelper library
if(JAVA_JVM_LIBRARY)
  set(JNI_JVM_FOUND TRUE)
else(JAVA_JVM_LIBRARY)
  set(JNI_JVM_FOUND FALSE)
endif()

if(JAVA_NativeHelper_LIBRARY)
  # Alias JAVA_JVM_LIBRARY to JAVA_NativeHelper_LIBRARY
  if(NOT JAVA_JVM_LIBRARY)
    set(JAVA_JVM_LIBRARY "${JAVA_NativeHelper_LIBRARY}" CACHE FILEPATH
      "Alias to nativehelper library" FORCE)
    # Make JVM component available
    set(JNI_JVM_FOUND TRUE)
  endif()
  set(JNI_NativeHelper_FOUND TRUE)
else()
  set(JNI_NativeHelper_FOUND FALSE)
endif()

# Restore CMAKE_FIND_FRAMEWORK
if(DEFINED _JNI_CMAKE_FIND_FRAMEWORK)
  set(CMAKE_FIND_FRAMEWORK ${_JNI_CMAKE_FIND_FRAMEWORK})
  unset(_JNI_CMAKE_FIND_FRAMEWORK)
else()
  unset(CMAKE_FIND_FRAMEWORK)
endif()

if(ANDROID)
  # Extract NDK version from source.properties in the NDK root
  set(JAVA_SOURCE_PROPERTIES_FILE ${CMAKE_ANDROID_NDK}/source.properties)

  if(EXISTS ${JAVA_SOURCE_PROPERTIES_FILE})
    file(READ ${JAVA_SOURCE_PROPERTIES_FILE} NDK_VERSION_CONTENTS)
    string (REGEX REPLACE
      ".*Pkg\\.Revision = (([0-9]+)\\.([0-9]+)\\.([0-9]+)([^\n]+)?).*" "\\1"
      JNI_VERSION "${NDK_VERSION_CONTENTS}")
    set(JNI_VERSION_MAJOR ${CMAKE_MATCH_1})
    set(JNI_VERSION_MINOR ${CMAKE_MATCH_2})
    set(JNI_VERSION_PATCH ${CMAKE_MATCH_3})
    set(JNI_VERSION_COMPONENTS 3)

    set(JNI_FPHSA_ARGS VERSION_VAR JNI_VERSION HANDLE_VERSION_RANGE)
  endif()
endif()

set(JNI_REQUIRED_VARS JAVA_INCLUDE_PATH)

if(NOT JNI_INCLUDE_PATH2_OPTIONAL)
  list(APPEND JNI_REQUIRED_VARS JAVA_INCLUDE_PATH2)
endif()

find_package_handle_standard_args(JNI
  REQUIRED_VARS ${JNI_REQUIRED_VARS}
  ${JNI_FPHSA_ARGS}
  HANDLE_COMPONENTS
)

mark_as_advanced(
  JAVA_AWT_LIBRARY
  JAVA_JVM_LIBRARY
  JAVA_AWT_INCLUDE_PATH
  JAVA_INCLUDE_PATH
  JAVA_INCLUDE_PATH2
)

set(JNI_LIBRARIES)

foreach(component IN LISTS JNI_FIND_COMPONENTS)
  if(JNI_${component}_FOUND)
    list(APPEND JNI_LIBRARIES ${JAVA_${component}_LIBRARY})
  endif()
endforeach()

set(JNI_INCLUDE_DIRS ${JAVA_INCLUDE_PATH})

if(NOT JNI_INCLUDE_PATH2_OPTIONAL)
  list(APPEND JNI_INCLUDE_DIRS ${JAVA_INCLUDE_PATH2})
endif()

if(JNI_FIND_REQUIRED_AWT)
  list(APPEND JNI_INCLUDE_DIRS ${JAVA_AWT_INCLUDE_PATH})
endif()

if(JNI_FOUND)
  if(NOT TARGET JNI::JNI)
    add_library(JNI::JNI IMPORTED INTERFACE)
  endif()

  set_property(TARGET JNI::JNI PROPERTY INTERFACE_INCLUDE_DIRECTORIES
    ${JAVA_INCLUDE_PATH})

  if(JNI_NativeHelper_FOUND)
    if(NOT TARGET JNI::NativeHelper)
      add_library(JNI::NativeHelper IMPORTED UNKNOWN)
    endif()

    set_property(TARGET JNI::NativeHelper PROPERTY INTERFACE_LINK_LIBRARIES
      JNI::JNI)
    set_property(TARGET JNI::NativeHelper PROPERTY IMPORTED_LOCATION
      ${JAVA_NativeHelper_LIBRARY})
  endif()

  if(NOT JNI_INCLUDE_PATH2_OPTIONAL AND JAVA_INCLUDE_PATH2)
    set_property(TARGET JNI::JNI APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES
      ${JAVA_INCLUDE_PATH2})
  endif()

  if(JNI_AWT_FOUND)
    if(NOT TARGET JNI::AWT)
      add_library(JNI::AWT IMPORTED UNKNOWN)
    endif(NOT TARGET JNI::AWT)

    set_property(TARGET JNI::AWT PROPERTY INTERFACE_INCLUDE_DIRECTORIES
      ${JAVA_AWT_INCLUDE_PATH})
    set_property(TARGET JNI::AWT PROPERTY IMPORTED_LOCATION
      ${JAVA_AWT_LIBRARY})
    set_property(TARGET JNI::AWT PROPERTY INTERFACE_LINK_LIBRARIES JNI::JNI)
  endif()

  if(JNI_JVM_FOUND OR JNI_NativeHelper_FOUND)
    # If Android nativehelper is available but not the JVM library, we still
    # define the JNI::JVM target but only declare JNI::NativeHelper as an
    # interface link library of the former. This provides a uniform access to
    # fundamental JVM functionality regardless of whether JVM or DVM is used. At
    # the same time, this allows the user to detect whenever exclusively
    # nativehelper functionality is available.
    if(NOT TARGET JNI::JVM)
      if(JAVA_JVM_LIBRARY AND NOT JAVA_JVM_LIBRARY STREQUAL JAVA_NativeHelper_LIBRARY)
        # JAVA_JVM_LIBRARY is not an alias of JAVA_NativeHelper_LIBRARY
        add_library(JNI::JVM IMPORTED UNKNOWN)
      else()
        add_library(JNI::JVM IMPORTED INTERFACE)
      endif()
    endif(NOT TARGET JNI::JVM)

    set_property(TARGET JNI::JVM PROPERTY INTERFACE_LINK_LIBRARIES JNI::JNI)
    get_property(_JNI_JVM_TYPE TARGET JNI::JVM PROPERTY TYPE)

    if(NOT _JNI_JVM_TYPE STREQUAL "INTERFACE_LIBRARY")
      set_property(TARGET JNI::JVM PROPERTY IMPORTED_LOCATION
        ${JAVA_JVM_LIBRARY})
    else()
      # We declare JNI::NativeHelper a dependency of JNI::JVM only if the latter
      # was not initially found. If the solely theoretical situation occurs
      # where both libraries are available, we want to avoid any potential
      # errors that can occur due to duplicate symbols.
      set_property(TARGET JNI::JVM APPEND PROPERTY INTERFACE_LINK_LIBRARIES
        JNI::NativeHelper)
    endif()

    unset(_JNI_JVM_TYPE)
  endif()
endif()

cmake_policy(POP)