CMake/Modules/UseJava.cmake

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

#[=======================================================================[.rst:
UseJava
-------

Use Module for Java

This file provides functions for Java.  It is assumed that
FindJava.cmake has already been loaded.  See FindJava.cmake for
information on how to load Java into your CMake project.

::

 add_jar(target_name
         [SOURCES] source1 [source2 ...] [resource1 ...]
         [INCLUDE_JARS jar1 [jar2 ...]]
         [ENTRY_POINT entry]
         [VERSION version]
         [OUTPUT_NAME name]
         [OUTPUT_DIR dir]
         [GENERATE_NATIVE_HEADERS target [DESTINATION dir]]
         )

This command creates a <target_name>.jar.  It compiles the given
source files (source) and adds the given resource files (resource) to
the jar file.  Source files can be java files or listing files
(prefixed by '@').  If only resource files are given then just a jar file
is created.  The list of include jars are added to the classpath when
compiling the java sources and also to the dependencies of the target.
INCLUDE_JARS also accepts other target names created by add_jar.  For
backwards compatibility, jar files listed as sources are ignored (as
they have been since the first version of this module).

The default OUTPUT_DIR can also be changed by setting the variable
CMAKE_JAVA_TARGET_OUTPUT_DIR.

Optionally, using option GENERATE_NATIVE_HEADERS, native header files can be generated
for methods declared as native. These files provide the connective glue that allow your
Java and C code to interact. An INTERFACE target will be created for an easy usage
of generated files. Sub-option DESTINATION can be used to specify output directory for
generated header files.

GENERATE_NATIVE_HEADERS option requires, at least, version 1.8 of the JDK.

Additional instructions:

::

   To add compile flags to the target you can set these flags with
   the following variable:



::

       set(CMAKE_JAVA_COMPILE_FLAGS -nowarn)



::

   To add a path or a jar file to the class path you can do this
   with the CMAKE_JAVA_INCLUDE_PATH variable.



::

       set(CMAKE_JAVA_INCLUDE_PATH /usr/share/java/shibboleet.jar)



::

   To use a different output name for the target you can set it with:



::

       add_jar(foobar foobar.java OUTPUT_NAME shibboleet.jar)



::

   To use a different output directory than CMAKE_CURRENT_BINARY_DIR
   you can set it with:



::

       add_jar(foobar foobar.java OUTPUT_DIR ${PROJECT_BINARY_DIR}/bin)



::

   To define an entry point in your jar you can set it with the ENTRY_POINT
   named argument:



::

       add_jar(example ENTRY_POINT com/examples/MyProject/Main)



::

   To define a custom manifest for the jar, you can set it with the manifest
   named argument:



::

       add_jar(example MANIFEST /path/to/manifest)



::

   To add a VERSION to the target output name you can set it using
   the VERSION named argument to add_jar. This will create a jar file with the
   name shibboleet-1.0.0.jar and will create a symlink shibboleet.jar
   pointing to the jar with the version information.



::

       add_jar(shibboleet shibbotleet.java VERSION 1.2.0)



::

    If the target is a JNI library, utilize the following commands to
    create a JNI symbolic link:



::

       set(CMAKE_JNI_TARGET TRUE)
       add_jar(shibboleet shibbotleet.java VERSION 1.2.0)
       install_jar(shibboleet ${LIB_INSTALL_DIR}/shibboleet)
       install_jni_symlink(shibboleet ${JAVA_LIB_INSTALL_DIR})



::

    If a single target needs to produce more than one jar from its
    java source code, to prevent the accumulation of duplicate class
    files in subsequent jars, set/reset CMAKE_JAR_CLASSES_PREFIX prior
    to calling the add_jar() function:



::

       set(CMAKE_JAR_CLASSES_PREFIX com/redhat/foo)
       add_jar(foo foo.java)



::

       set(CMAKE_JAR_CLASSES_PREFIX com/redhat/bar)
       add_jar(bar bar.java)



::

    For an optimum usage of option GENERATE_NATIVE_HEADERS, it is recommended to
    include module JNI before any call to add_jar. The produced target for native
    headers can then be used to compile C/C++ sources with command
    target_link_libraries.


::

       find_package(JNI)
       add_jar(foo foo.java GENERATE_NATIVE_HEADERS foo-native)
       add_library(bar bar.cpp)
       target_link_libraries(bar PRIVATE foo-native)


Target Properties:

::

   The add_jar() function sets some target properties. You can get these
   properties with the
      get_property(TARGET <target_name> PROPERTY <propery_name>)
   command.



::

   INSTALL_FILES      The files which should be installed. This is used by
                      install_jar().
   JNI_SYMLINK        The JNI symlink which should be installed.
                      This is used by install_jni_symlink().
   JAR_FILE           The location of the jar file so that you can include
                      it.
   CLASSDIR           The directory where the class files can be found. For
                      example to use them with javah.

::

 find_jar(<VAR>
          name | NAMES name1 [name2 ...]
          [PATHS path1 [path2 ... ENV var]]
          [VERSIONS version1 [version2]]
          [DOC "cache documentation string"]
          )

This command is used to find a full path to the named jar.  A cache
entry named by <VAR> is created to stor the result of this command.
If the full path to a jar is found the result is stored in the
variable and the search will not repeated unless the variable is
cleared.  If nothing is found, the result will be <VAR>-NOTFOUND, and
the search will be attempted again next time find_jar is invoked with
the same variable.  The name of the full path to a file that is
searched for is specified by the names listed after NAMES argument.
Additional search locations can be specified after the PATHS argument.
If you require special a version of a jar file you can specify it with
the VERSIONS argument.  The argument after DOC will be used for the
documentation string in the cache.

::

 install_jar(target_name destination)
 install_jar(target_name DESTINATION destination [COMPONENT component])

This command installs the TARGET_NAME files to the given DESTINATION.
It should be called in the same scope as add_jar() or it will fail.

Target Properties:

::

   The install_jar() function sets the INSTALL_DESTINATION target property
   on jars so installed. This property holds the DESTINATION as described
   above, and is used by install_jar_exports(). You can get this property
   with the
      get_property(TARGET <target_name> PROPERTY INSTALL_DESTINATION)
   command.



::

 install_jni_symlink(target_name destination)
 install_jni_symlink(target_name DESTINATION destination [COMPONENT component])

This command installs the TARGET_NAME JNI symlinks to the given
DESTINATION.  It should be called in the same scope as add_jar() or it
will fail.

::

 install_jar_exports(TARGETS jars...
                     [NAMESPACE <namespace>]
                     FILE <filename>
                     DESTINATION <dir> [COMPONENT <component>])

This command installs a target export file ``<filename>`` for the named jar
targets to the given ``DESTINATION``. Its function is similar to that of
:command:`install(EXPORTS ...)`.

::

 export_jars(TARGETS jars...
             [NAMESPACE <namespace>]
             FILE <filename>)

This command writes a target export file ``<filename>`` for the named jar
targets. Its function is similar to that of :command:`export(...)`.

::

 create_javadoc(<VAR>
                PACKAGES pkg1 [pkg2 ...]
                [SOURCEPATH <sourcepath>]
                [CLASSPATH <classpath>]
                [INSTALLPATH <install path>]
                [DOCTITLE "the documentation title"]
                [WINDOWTITLE "the title of the document"]
                [AUTHOR TRUE|FALSE]
                [USE TRUE|FALSE]
                [VERSION TRUE|FALSE]
                )

Create java documentation based on files or packages.  For more
details please read the javadoc manpage.

There are two main signatures for create_javadoc.  The first signature
works with package names on a path with source files:

::

   Example:
   create_javadoc(my_example_doc
     PACKAGES com.example.foo com.example.bar
     SOURCEPATH "${CMAKE_CURRENT_SOURCE_DIR}"
     CLASSPATH ${CMAKE_JAVA_INCLUDE_PATH}
     WINDOWTITLE "My example"
     DOCTITLE "<h1>My example</h1>"
     AUTHOR TRUE
     USE TRUE
     VERSION TRUE
   )



The second signature for create_javadoc works on a given list of
files.

::

   create_javadoc(<VAR>
                  FILES file1 [file2 ...]
                  [CLASSPATH <classpath>]
                  [INSTALLPATH <install path>]
                  [DOCTITLE "the documentation title"]
                  [WINDOWTITLE "the title of the document"]
                  [AUTHOR TRUE|FALSE]
                  [USE TRUE|FALSE]
                  [VERSION TRUE|FALSE]
                 )



Example:

::

   create_javadoc(my_example_doc
     FILES ${example_SRCS}
     CLASSPATH ${CMAKE_JAVA_INCLUDE_PATH}
     WINDOWTITLE "My example"
     DOCTITLE "<h1>My example</h1>"
     AUTHOR TRUE
     USE TRUE
     VERSION TRUE
   )



Both signatures share most of the options.  These options are the same
as what you can find in the javadoc manpage.  Please look at the
manpage for CLASSPATH, DOCTITLE, WINDOWTITLE, AUTHOR, USE and VERSION.

The documentation will be by default installed to

::

   ${CMAKE_INSTALL_PREFIX}/share/javadoc/<VAR>



if you don't set the INSTALLPATH.

::

 create_javah(TARGET <target>
              GENERATED_FILES <VAR>
              CLASSES <class>...
              [CLASSPATH <classpath>...]
              [DEPENDS <depend>...]
              [OUTPUT_NAME <path>|OUTPUT_DIR <path>]
              )

Create C header files from java classes. These files provide the connective glue
that allow your Java and C code to interact.

This command will no longer be supported starting with version 10 of the JDK due
to the `suppression of javah tool <http://openjdk.java.net/jeps/313>`_.
Command ``add_jar(GENERATE_NATIVE_HEADERS)`` must be used instead.

There are two main signatures for create_javah.  The first signature
returns generated files through variable specified by GENERATED_FILES option:

::

   Example:
   Create_javah(GENERATED_FILES files_headers
     CLASSES org.cmake.HelloWorld
     CLASSPATH hello.jar
   )



The second signature for create_javah creates a target which encapsulates
header files generation.

::

   Example:
   Create_javah(TARGET target_headers
     CLASSES org.cmake.HelloWorld
     CLASSPATH hello.jar
   )



Both signatures share same options.

 ``CLASSES <class>...``
   Specifies Java classes used to generate headers.

 ``CLASSPATH <classpath>...``
   Specifies various paths to look up classes. Here .class files, jar files or targets
   created by command add_jar can be used.

 ``DEPENDS <depend>...``
   Targets on which the javah target depends

 ``OUTPUT_NAME <path>``
   Concatenates the resulting header files for all the classes listed by option CLASSES
   into <path>. Same behavior as option '-o' of javah tool.

 ``OUTPUT_DIR <path>``
   Sets the directory where the header files will be generated. Same behavior as option
   '-d' of javah tool. If not specified, ${CMAKE_CURRENT_BINARY_DIR} is used as output directory.
#]=======================================================================]

function (__java_copy_file src dest comment)
    add_custom_command(
        OUTPUT  ${dest}
        COMMAND ${CMAKE_COMMAND} -E copy_if_different
        ARGS    ${src}
                ${dest}
        DEPENDS ${src}
        COMMENT ${comment})
endfunction ()

function(__java_lcat VAR)
    foreach(_line ${ARGN})
        string(APPEND ${VAR} "${_line}\n")
    endforeach()

    set(${VAR} "${${VAR}}" PARENT_SCOPE)
endfunction()

function(__java_export_jar VAR TARGET PATH)
    get_target_property(_jarpath ${TARGET} JAR_FILE)
    get_filename_component(_jarname ${_jarpath} NAME)
    set(_target "${_jar_NAMESPACE}${TARGET}")
    __java_lcat(${VAR}
      "# Create imported target ${_target}"
      "add_library(${_target} IMPORTED STATIC)"
      "set_target_properties(${_target} PROPERTIES"
      "  IMPORTED_LOCATION \"${PATH}/${_jarname}\""
      "  JAR_FILE \"${PATH}/${_jarname}\")"
      ""
    )
    set(${VAR} "${${VAR}}" PARENT_SCOPE)
endfunction()

# define helper scripts
set(_JAVA_EXPORT_TARGETS_SCRIPT ${CMAKE_CURRENT_LIST_DIR}/javaTargets.cmake.in)
set(_JAVA_CLASS_FILELIST_SCRIPT ${CMAKE_CURRENT_LIST_DIR}/UseJavaClassFilelist.cmake)
set(_JAVA_SYMLINK_SCRIPT ${CMAKE_CURRENT_LIST_DIR}/UseJavaSymlinks.cmake)

function(add_jar _TARGET_NAME)

    cmake_parse_arguments(_add_jar
      ""
      "VERSION;OUTPUT_DIR;OUTPUT_NAME;ENTRY_POINT;MANIFEST"
      "SOURCES;INCLUDE_JARS;GENERATE_NATIVE_HEADERS"
      ${ARGN}
    )

    # In CMake < 2.8.12, add_jar used variables which were set prior to calling
    # add_jar for customizing the behavior of add_jar. In order to be backwards
    # compatible, check if any of those variables are set, and use them to
    # initialize values of the named arguments. (Giving the corresponding named
    # argument will override the value set here.)
    #
    # New features should use named arguments only.
    if(NOT DEFINED _add_jar_VERSION AND DEFINED CMAKE_JAVA_TARGET_VERSION)
        set(_add_jar_VERSION "${CMAKE_JAVA_TARGET_VERSION}")
    endif()
    if(NOT DEFINED _add_jar_OUTPUT_DIR AND DEFINED CMAKE_JAVA_TARGET_OUTPUT_DIR)
        set(_add_jar_OUTPUT_DIR "${CMAKE_JAVA_TARGET_OUTPUT_DIR}")
    endif()
    if(NOT DEFINED _add_jar_OUTPUT_NAME AND DEFINED CMAKE_JAVA_TARGET_OUTPUT_NAME)
        set(_add_jar_OUTPUT_NAME "${CMAKE_JAVA_TARGET_OUTPUT_NAME}")
        # reset
        set(CMAKE_JAVA_TARGET_OUTPUT_NAME)
    endif()
    if(NOT DEFINED _add_jar_ENTRY_POINT AND DEFINED CMAKE_JAVA_JAR_ENTRY_POINT)
        set(_add_jar_ENTRY_POINT "${CMAKE_JAVA_JAR_ENTRY_POINT}")
    endif()

    set(_JAVA_SOURCE_FILES ${_add_jar_SOURCES} ${_add_jar_UNPARSED_ARGUMENTS})

    if (NOT DEFINED _add_jar_OUTPUT_DIR)
        set(_add_jar_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR})
    else()
        get_filename_component(_add_jar_OUTPUT_DIR ${_add_jar_OUTPUT_DIR} ABSOLUTE)
    endif()
    # ensure output directory exists
    file (MAKE_DIRECTORY "${_add_jar_OUTPUT_DIR}")

    if (_add_jar_ENTRY_POINT)
        set(_ENTRY_POINT_OPTION e)
        set(_ENTRY_POINT_VALUE ${_add_jar_ENTRY_POINT})
    endif ()

    if (_add_jar_MANIFEST)
        set(_MANIFEST_OPTION m)
        get_filename_component (_MANIFEST_VALUE "${_add_jar_MANIFEST}" ABSOLUTE)
    endif ()

    unset (_GENERATE_NATIVE_HEADERS)
    if (_add_jar_GENERATE_NATIVE_HEADERS)
      # Raise an error if JDK version is less than 1.8 because javac -h is not supported
      # by earlier versions.
      if (Java_VERSION VERSION_LESS 1.8)
        message (FATAL_ERROR "ADD_JAR: GENERATE_NATIVE_HEADERS is not supported with this version of Java.")
      endif()
      cmake_parse_arguments (_add_jar_GENERATE_NATIVE_HEADERS "" "DESTINATION" "" ${_add_jar_GENERATE_NATIVE_HEADERS})
      if (NOT _add_jar_GENERATE_NATIVE_HEADERS_UNPARSED_ARGUMENTS)
        message (FATAL_ERROR "ADD_JAR: GENERATE_NATIVE_HEADERS: missing required argument.")
      endif()
      list (LENGTH _add_jar_GENERATE_NATIVE_HEADERS_UNPARSED_ARGUMENTS length)
      if (length GREATER 1)
        list (REMOVE_AT _add_jar_GENERATE_NATIVE_HEADERS_UNPARSED_ARGUMENTS 0)
        message (FATAL_ERROR "ADD_JAR: GENERATE_NATIVE_HEADERS: ${_add_jar_GENERATE_NATIVE_HEADERS_UNPARSED_ARGUMENTS}: unexpected argument(s).")
      endif()
      if (NOT _add_jar_GENERATE_NATIVE_HEADERS_DESTINATION)
        set (_add_jar_GENERATE_NATIVE_HEADERS_DESTINATION "${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/${_TARGET_NAME}.dir/native_headers")
      endif()

      set (_GENERATE_NATIVE_HEADERS_TARGET ${_add_jar_GENERATE_NATIVE_HEADERS_UNPARSED_ARGUMENTS})
      set (_GENERATE_NATIVE_HEADERS_OUTPUT_DIR "${_add_jar_GENERATE_NATIVE_HEADERS_DESTINATION}")
      set (_GENERATE_NATIVE_HEADERS -h "${_GENERATE_NATIVE_HEADERS_OUTPUT_DIR}")
    endif()

    if (LIBRARY_OUTPUT_PATH)
        set(CMAKE_JAVA_LIBRARY_OUTPUT_PATH ${LIBRARY_OUTPUT_PATH})
    else ()
        set(CMAKE_JAVA_LIBRARY_OUTPUT_PATH ${_add_jar_OUTPUT_DIR})
    endif ()

    set(CMAKE_JAVA_INCLUDE_PATH
        ${CMAKE_JAVA_INCLUDE_PATH}
        ${CMAKE_CURRENT_SOURCE_DIR}
        ${CMAKE_JAVA_OBJECT_OUTPUT_PATH}
        ${CMAKE_JAVA_LIBRARY_OUTPUT_PATH}
    )

    if (CMAKE_HOST_WIN32 AND NOT CYGWIN AND CMAKE_HOST_SYSTEM_NAME MATCHES "Windows")
        set(CMAKE_JAVA_INCLUDE_FLAG_SEP ";")
    else ()
        set(CMAKE_JAVA_INCLUDE_FLAG_SEP ":")
    endif()

    foreach (JAVA_INCLUDE_DIR ${CMAKE_JAVA_INCLUDE_PATH})
       string(APPEND CMAKE_JAVA_INCLUDE_PATH_FINAL "${CMAKE_JAVA_INCLUDE_FLAG_SEP}${JAVA_INCLUDE_DIR}")
    endforeach()

    set(CMAKE_JAVA_CLASS_OUTPUT_PATH "${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/${_TARGET_NAME}.dir")

    set(_JAVA_TARGET_OUTPUT_NAME "${_TARGET_NAME}.jar")
    if (_add_jar_OUTPUT_NAME AND _add_jar_VERSION)
        set(_JAVA_TARGET_OUTPUT_NAME "${_add_jar_OUTPUT_NAME}-${_add_jar_VERSION}.jar")
        set(_JAVA_TARGET_OUTPUT_LINK "${_add_jar_OUTPUT_NAME}.jar")
    elseif (_add_jar_VERSION)
        set(_JAVA_TARGET_OUTPUT_NAME "${_TARGET_NAME}-${_add_jar_VERSION}.jar")
        set(_JAVA_TARGET_OUTPUT_LINK "${_TARGET_NAME}.jar")
    elseif (_add_jar_OUTPUT_NAME)
        set(_JAVA_TARGET_OUTPUT_NAME "${_add_jar_OUTPUT_NAME}.jar")
    endif ()

    set(_JAVA_CLASS_FILES)
    set(_JAVA_COMPILE_FILES)
    set(_JAVA_COMPILE_FILELISTS)
    set(_JAVA_DEPENDS)
    set(_JAVA_COMPILE_DEPENDS)
    set(_JAVA_RESOURCE_FILES)
    set(_JAVA_RESOURCE_FILES_RELATIVE)
    foreach(_JAVA_SOURCE_FILE ${_JAVA_SOURCE_FILES})
        get_filename_component(_JAVA_EXT ${_JAVA_SOURCE_FILE} EXT)
        get_filename_component(_JAVA_FILE ${_JAVA_SOURCE_FILE} NAME_WE)
        get_filename_component(_JAVA_PATH ${_JAVA_SOURCE_FILE} PATH)
        get_filename_component(_JAVA_FULL ${_JAVA_SOURCE_FILE} ABSOLUTE)

        if (_JAVA_SOURCE_FILE MATCHES "^@(.+)$")
            get_filename_component(_JAVA_FULL ${CMAKE_MATCH_1} ABSOLUTE)
            list(APPEND _JAVA_COMPILE_FILELISTS ${_JAVA_FULL})

        elseif (_JAVA_EXT MATCHES ".java")
            file(RELATIVE_PATH _JAVA_REL_BINARY_PATH ${CMAKE_CURRENT_BINARY_DIR} ${_JAVA_FULL})
            file(RELATIVE_PATH _JAVA_REL_SOURCE_PATH ${CMAKE_CURRENT_SOURCE_DIR} ${_JAVA_FULL})
            string(LENGTH ${_JAVA_REL_BINARY_PATH} _BIN_LEN)
            string(LENGTH ${_JAVA_REL_SOURCE_PATH} _SRC_LEN)
            if (${_BIN_LEN} LESS ${_SRC_LEN})
                set(_JAVA_REL_PATH ${_JAVA_REL_BINARY_PATH})
            else ()
                set(_JAVA_REL_PATH ${_JAVA_REL_SOURCE_PATH})
            endif ()
            get_filename_component(_JAVA_REL_PATH ${_JAVA_REL_PATH} PATH)

            list(APPEND _JAVA_COMPILE_FILES ${_JAVA_SOURCE_FILE})
            set(_JAVA_CLASS_FILE "${CMAKE_JAVA_CLASS_OUTPUT_PATH}/${_JAVA_REL_PATH}/${_JAVA_FILE}.class")
            set(_JAVA_CLASS_FILES ${_JAVA_CLASS_FILES} ${_JAVA_CLASS_FILE})

        elseif (_JAVA_EXT MATCHES ".jar"
                OR _JAVA_EXT MATCHES ".war"
                OR _JAVA_EXT MATCHES ".ear"
                OR _JAVA_EXT MATCHES ".sar")
            # Ignored for backward compatibility

        elseif (_JAVA_EXT STREQUAL "")
            list(APPEND CMAKE_JAVA_INCLUDE_PATH ${JAVA_JAR_TARGET_${_JAVA_SOURCE_FILE}} ${JAVA_JAR_TARGET_${_JAVA_SOURCE_FILE}_CLASSPATH})
            list(APPEND _JAVA_DEPENDS ${JAVA_JAR_TARGET_${_JAVA_SOURCE_FILE}})

        else ()
            __java_copy_file(${CMAKE_CURRENT_SOURCE_DIR}/${_JAVA_SOURCE_FILE}
                             ${CMAKE_JAVA_CLASS_OUTPUT_PATH}/${_JAVA_SOURCE_FILE}
                             "Copying ${_JAVA_SOURCE_FILE} to the build directory")
            list(APPEND _JAVA_RESOURCE_FILES ${CMAKE_JAVA_CLASS_OUTPUT_PATH}/${_JAVA_SOURCE_FILE})
            list(APPEND _JAVA_RESOURCE_FILES_RELATIVE ${_JAVA_SOURCE_FILE})
        endif ()
    endforeach()

    foreach(_JAVA_INCLUDE_JAR ${_add_jar_INCLUDE_JARS})
        if (TARGET ${_JAVA_INCLUDE_JAR})
            get_target_property(_JAVA_JAR_PATH ${_JAVA_INCLUDE_JAR} JAR_FILE)
            if (_JAVA_JAR_PATH)
                string(APPEND CMAKE_JAVA_INCLUDE_PATH_FINAL "${CMAKE_JAVA_INCLUDE_FLAG_SEP}${_JAVA_JAR_PATH}")
                list(APPEND CMAKE_JAVA_INCLUDE_PATH ${_JAVA_JAR_PATH})
                list(APPEND _JAVA_DEPENDS ${_JAVA_INCLUDE_JAR})
                list(APPEND _JAVA_COMPILE_DEPENDS ${_JAVA_JAR_PATH})
            else ()
                message(SEND_ERROR "add_jar: INCLUDE_JARS target ${_JAVA_INCLUDE_JAR} is not a jar")
            endif ()
        else ()
            string(APPEND CMAKE_JAVA_INCLUDE_PATH_FINAL "${CMAKE_JAVA_INCLUDE_FLAG_SEP}${_JAVA_INCLUDE_JAR}")
            list(APPEND CMAKE_JAVA_INCLUDE_PATH "${_JAVA_INCLUDE_JAR}")
            list(APPEND _JAVA_DEPENDS "${_JAVA_INCLUDE_JAR}")
            list(APPEND _JAVA_COMPILE_DEPENDS "${_JAVA_INCLUDE_JAR}")
        endif ()
    endforeach()

    if (_JAVA_COMPILE_FILES OR _JAVA_COMPILE_FILELISTS)
        set (_JAVA_SOURCES_FILELISTS)

        if (_JAVA_COMPILE_FILES)
            # Create the list of files to compile.
            set(_JAVA_SOURCES_FILE ${CMAKE_JAVA_CLASS_OUTPUT_PATH}/java_sources)
            string(REPLACE ";" "\"\n\"" _JAVA_COMPILE_STRING "\"${_JAVA_COMPILE_FILES}\"")
            file(WRITE ${_JAVA_SOURCES_FILE} ${_JAVA_COMPILE_STRING})
            list (APPEND _JAVA_SOURCES_FILELISTS "@${_JAVA_SOURCES_FILE}")
        endif()
        if (_JAVA_COMPILE_FILELISTS)
            foreach (_JAVA_FILELIST IN LISTS _JAVA_COMPILE_FILELISTS)
                list (APPEND _JAVA_SOURCES_FILELISTS "@${_JAVA_FILELIST}")
            endforeach()
        endif()

        # Compile the java files and create a list of class files
        add_custom_command(
            # NOTE: this command generates an artificial dependency file
            OUTPUT ${CMAKE_JAVA_CLASS_OUTPUT_PATH}/java_compiled_${_TARGET_NAME}
            COMMAND ${Java_JAVAC_EXECUTABLE}
                ${CMAKE_JAVA_COMPILE_FLAGS}
                -classpath "${CMAKE_JAVA_INCLUDE_PATH_FINAL}"
                -d ${CMAKE_JAVA_CLASS_OUTPUT_PATH}
                ${_GENERATE_NATIVE_HEADERS}
                ${_JAVA_SOURCES_FILELISTS}
            COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_JAVA_CLASS_OUTPUT_PATH}/java_compiled_${_TARGET_NAME}
            DEPENDS ${_JAVA_COMPILE_FILES} ${_JAVA_COMPILE_FILELISTS} ${_JAVA_COMPILE_DEPENDS}
            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
            COMMENT "Building Java objects for ${_TARGET_NAME}.jar"
        )
        add_custom_command(
            OUTPUT ${CMAKE_JAVA_CLASS_OUTPUT_PATH}/java_class_filelist
            COMMAND ${CMAKE_COMMAND}
                -DCMAKE_JAVA_CLASS_OUTPUT_PATH=${CMAKE_JAVA_CLASS_OUTPUT_PATH}
                -DCMAKE_JAR_CLASSES_PREFIX="${CMAKE_JAR_CLASSES_PREFIX}"
                -P ${_JAVA_CLASS_FILELIST_SCRIPT}
            DEPENDS ${CMAKE_JAVA_CLASS_OUTPUT_PATH}/java_compiled_${_TARGET_NAME}
            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
        )
    else ()
        # create an empty java_class_filelist
        if (NOT EXISTS ${CMAKE_JAVA_CLASS_OUTPUT_PATH}/java_class_filelist)
            file(WRITE ${CMAKE_JAVA_CLASS_OUTPUT_PATH}/java_class_filelist "")
        endif()
    endif ()

    # create the jar file
    set(_JAVA_JAR_OUTPUT_PATH
      ${_add_jar_OUTPUT_DIR}/${_JAVA_TARGET_OUTPUT_NAME})
    if (CMAKE_JNI_TARGET)
        add_custom_command(
            OUTPUT ${_JAVA_JAR_OUTPUT_PATH}
            COMMAND ${Java_JAR_EXECUTABLE}
                -cf${_ENTRY_POINT_OPTION}${_MANIFEST_OPTION} ${_JAVA_JAR_OUTPUT_PATH} ${_ENTRY_POINT_VALUE} ${_MANIFEST_VALUE}
                ${_JAVA_RESOURCE_FILES_RELATIVE} @java_class_filelist
            COMMAND ${CMAKE_COMMAND}
                -D_JAVA_TARGET_DIR=${_add_jar_OUTPUT_DIR}
                -D_JAVA_TARGET_OUTPUT_NAME=${_JAVA_TARGET_OUTPUT_NAME}
                -D_JAVA_TARGET_OUTPUT_LINK=${_JAVA_TARGET_OUTPUT_LINK}
                -P ${_JAVA_SYMLINK_SCRIPT}
            COMMAND ${CMAKE_COMMAND}
                -D_JAVA_TARGET_DIR=${_add_jar_OUTPUT_DIR}
                -D_JAVA_TARGET_OUTPUT_NAME=${_JAVA_JAR_OUTPUT_PATH}
                -D_JAVA_TARGET_OUTPUT_LINK=${_JAVA_TARGET_OUTPUT_LINK}
                -P ${_JAVA_SYMLINK_SCRIPT}
            DEPENDS ${_JAVA_RESOURCE_FILES} ${_JAVA_DEPENDS} ${CMAKE_JAVA_CLASS_OUTPUT_PATH}/java_class_filelist
            WORKING_DIRECTORY ${CMAKE_JAVA_CLASS_OUTPUT_PATH}
            COMMENT "Creating Java archive ${_JAVA_TARGET_OUTPUT_NAME}"
        )
    else ()
        add_custom_command(
            OUTPUT ${_JAVA_JAR_OUTPUT_PATH}
            COMMAND ${Java_JAR_EXECUTABLE}
                -cf${_ENTRY_POINT_OPTION}${_MANIFEST_OPTION} ${_JAVA_JAR_OUTPUT_PATH} ${_ENTRY_POINT_VALUE} ${_MANIFEST_VALUE}
                ${_JAVA_RESOURCE_FILES_RELATIVE} @java_class_filelist
            COMMAND ${CMAKE_COMMAND}
                -D_JAVA_TARGET_DIR=${_add_jar_OUTPUT_DIR}
                -D_JAVA_TARGET_OUTPUT_NAME=${_JAVA_TARGET_OUTPUT_NAME}
                -D_JAVA_TARGET_OUTPUT_LINK=${_JAVA_TARGET_OUTPUT_LINK}
                -P ${_JAVA_SYMLINK_SCRIPT}
            WORKING_DIRECTORY ${CMAKE_JAVA_CLASS_OUTPUT_PATH}
            DEPENDS ${_JAVA_RESOURCE_FILES} ${_JAVA_DEPENDS} ${CMAKE_JAVA_CLASS_OUTPUT_PATH}/java_class_filelist
            COMMENT "Creating Java archive ${_JAVA_TARGET_OUTPUT_NAME}"
        )
    endif ()

    # Add the target and make sure we have the latest resource files.
    add_custom_target(${_TARGET_NAME} ALL DEPENDS ${_JAVA_JAR_OUTPUT_PATH})

    set_property(
        TARGET
            ${_TARGET_NAME}
        PROPERTY
            INSTALL_FILES
                ${_JAVA_JAR_OUTPUT_PATH}
    )

    if (_JAVA_TARGET_OUTPUT_LINK)
        set_property(
            TARGET
                ${_TARGET_NAME}
            PROPERTY
                INSTALL_FILES
                    ${_JAVA_JAR_OUTPUT_PATH}
                    ${_add_jar_OUTPUT_DIR}/${_JAVA_TARGET_OUTPUT_LINK}
        )

        if (CMAKE_JNI_TARGET)
            set_property(
                TARGET
                    ${_TARGET_NAME}
                PROPERTY
                    JNI_SYMLINK
                        ${_add_jar_OUTPUT_DIR}/${_JAVA_TARGET_OUTPUT_LINK}
            )
        endif ()
    endif ()

    set_property(
        TARGET
            ${_TARGET_NAME}
        PROPERTY
            JAR_FILE
                ${_JAVA_JAR_OUTPUT_PATH}
    )

    set_property(
        TARGET
            ${_TARGET_NAME}
        PROPERTY
            CLASSDIR
                ${CMAKE_JAVA_CLASS_OUTPUT_PATH}
    )

  if (_GENERATE_NATIVE_HEADERS)
    # create an INTERFACE library encapsulating include directory for generated headers
    add_library (${_GENERATE_NATIVE_HEADERS_TARGET} INTERFACE)
    target_include_directories (${_GENERATE_NATIVE_HEADERS_TARGET} INTERFACE
      "${_GENERATE_NATIVE_HEADERS_OUTPUT_DIR}"
      ${JNI_INCLUDE_DIRS})
    # this INTERFACE library depends on jar generation
    add_dependencies (${_GENERATE_NATIVE_HEADERS_TARGET} ${_TARGET_NAME})

    set_property (DIRECTORY PROPERTY ADDITIONAL_MAKE_CLEAN_FILES "${_GENERATE_NATIVE_HEADERS_OUTPUT_DIR}")
  endif()
endfunction()

function(INSTALL_JAR _TARGET_NAME)
    if (ARGC EQUAL 2)
      set (_DESTINATION ${ARGV1})
    else()
      cmake_parse_arguments(_install_jar
        ""
        "DESTINATION;COMPONENT"
        ""
        ${ARGN})
      if (_install_jar_DESTINATION)
        set (_DESTINATION ${_install_jar_DESTINATION})
      else()
        message(SEND_ERROR "install_jar: ${_TARGET_NAME}: DESTINATION must be specified.")
      endif()

      if (_install_jar_COMPONENT)
        set (_COMPONENT COMPONENT ${_install_jar_COMPONENT})
      endif()
    endif()

    get_property(__FILES
        TARGET
            ${_TARGET_NAME}
        PROPERTY
            INSTALL_FILES
    )
    set_property(
        TARGET
            ${_TARGET_NAME}
        PROPERTY
            INSTALL_DESTINATION
            ${_DESTINATION}
    )

    if (__FILES)
        install(
            FILES
                ${__FILES}
            DESTINATION
                ${_DESTINATION}
            ${_COMPONENT}
        )
    else ()
        message(SEND_ERROR "install_jar: The target ${_TARGET_NAME} is not known in this scope.")
    endif ()
endfunction()

function(INSTALL_JNI_SYMLINK _TARGET_NAME)
    if (ARGC EQUAL 2)
      set (_DESTINATION ${ARGV1})
    else()
      cmake_parse_arguments(_install_jni_symlink
        ""
        "DESTINATION;COMPONENT"
        ""
        ${ARGN})
      if (_install_jni_symlink_DESTINATION)
        set (_DESTINATION ${_install_jni_symlink_DESTINATION})
      else()
        message(SEND_ERROR "install_jni_symlink: ${_TARGET_NAME}: DESTINATION must be specified.")
      endif()

      if (_install_jni_symlink_COMPONENT)
        set (_COMPONENT COMPONENT ${_install_jni_symlink_COMPONENT})
      endif()
    endif()

    get_property(__SYMLINK
        TARGET
            ${_TARGET_NAME}
        PROPERTY
            JNI_SYMLINK
    )

    if (__SYMLINK)
        install(
            FILES
                ${__SYMLINK}
            DESTINATION
                ${_DESTINATION}
            ${_COMPONENT}
        )
    else ()
        message(SEND_ERROR "install_jni_symlink: The target ${_TARGET_NAME} is not known in this scope.")
    endif ()
endfunction()

function (find_jar VARIABLE)
    set(_jar_names)
    set(_jar_files)
    set(_jar_versions)
    set(_jar_paths
        /usr/share/java/
        /usr/local/share/java/
        ${Java_JAR_PATHS})
    set(_jar_doc "NOTSET")

    set(_state "name")

    foreach (arg ${ARGN})
        if (${_state} STREQUAL "name")
            if (${arg} STREQUAL "VERSIONS")
                set(_state "versions")
            elseif (${arg} STREQUAL "NAMES")
                set(_state "names")
            elseif (${arg} STREQUAL "PATHS")
                set(_state "paths")
            elseif (${arg} STREQUAL "DOC")
                set(_state "doc")
            else ()
                set(_jar_names ${arg})
                if (_jar_doc STREQUAL "NOTSET")
                    set(_jar_doc "Finding ${arg} jar")
                endif ()
            endif ()
        elseif (${_state} STREQUAL "versions")
            if (${arg} STREQUAL "NAMES")
                set(_state "names")
            elseif (${arg} STREQUAL "PATHS")
                set(_state "paths")
            elseif (${arg} STREQUAL "DOC")
                set(_state "doc")
            else ()
                set(_jar_versions ${_jar_versions} ${arg})
            endif ()
        elseif (${_state} STREQUAL "names")
            if (${arg} STREQUAL "VERSIONS")
                set(_state "versions")
            elseif (${arg} STREQUAL "PATHS")
                set(_state "paths")
            elseif (${arg} STREQUAL "DOC")
                set(_state "doc")
            else ()
                set(_jar_names ${_jar_names} ${arg})
                if (_jar_doc STREQUAL "NOTSET")
                    set(_jar_doc "Finding ${arg} jar")
                endif ()
            endif ()
        elseif (${_state} STREQUAL "paths")
            if (${arg} STREQUAL "VERSIONS")
                set(_state "versions")
            elseif (${arg} STREQUAL "NAMES")
                set(_state "names")
            elseif (${arg} STREQUAL "DOC")
                set(_state "doc")
            else ()
                set(_jar_paths ${_jar_paths} ${arg})
            endif ()
        elseif (${_state} STREQUAL "doc")
            if (${arg} STREQUAL "VERSIONS")
                set(_state "versions")
            elseif (${arg} STREQUAL "NAMES")
                set(_state "names")
            elseif (${arg} STREQUAL "PATHS")
                set(_state "paths")
            else ()
                set(_jar_doc ${arg})
            endif ()
        endif ()
    endforeach ()

    if (NOT _jar_names)
        message(FATAL_ERROR "find_jar: No name to search for given")
    endif ()

    foreach (jar_name ${_jar_names})
        foreach (version ${_jar_versions})
            set(_jar_files ${_jar_files} ${jar_name}-${version}.jar)
        endforeach ()
        set(_jar_files ${_jar_files} ${jar_name}.jar)
    endforeach ()

    find_file(${VARIABLE}
        NAMES   ${_jar_files}
        PATHS   ${_jar_paths}
        DOC     ${_jar_doc}
        NO_DEFAULT_PATH)
endfunction ()

function(create_javadoc _target)
    set(_javadoc_packages)
    set(_javadoc_files)
    set(_javadoc_sourcepath)
    set(_javadoc_classpath)
    set(_javadoc_installpath "${CMAKE_INSTALL_PREFIX}/share/javadoc")
    set(_javadoc_doctitle)
    set(_javadoc_windowtitle)
    set(_javadoc_author FALSE)
    set(_javadoc_version FALSE)
    set(_javadoc_use FALSE)

    set(_state "package")

    foreach (arg ${ARGN})
        if (${_state} STREQUAL "package")
            if (${arg} STREQUAL "PACKAGES")
                set(_state "packages")
            elseif (${arg} STREQUAL "FILES")
                set(_state "files")
            elseif (${arg} STREQUAL "SOURCEPATH")
                set(_state "sourcepath")
            elseif (${arg} STREQUAL "CLASSPATH")
                set(_state "classpath")
            elseif (${arg} STREQUAL "INSTALLPATH")
                set(_state "installpath")
            elseif (${arg} STREQUAL "DOCTITLE")
                set(_state "doctitle")
            elseif (${arg} STREQUAL "WINDOWTITLE")
                set(_state "windowtitle")
            elseif (${arg} STREQUAL "AUTHOR")
                set(_state "author")
            elseif (${arg} STREQUAL "USE")
                set(_state "use")
            elseif (${arg} STREQUAL "VERSION")
                set(_state "version")
            else ()
                set(_javadoc_packages ${arg})
                set(_state "packages")
            endif ()
        elseif (${_state} STREQUAL "packages")
            if (${arg} STREQUAL "FILES")
                set(_state "files")
            elseif (${arg} STREQUAL "SOURCEPATH")
                set(_state "sourcepath")
            elseif (${arg} STREQUAL "CLASSPATH")
                set(_state "classpath")
            elseif (${arg} STREQUAL "INSTALLPATH")
                set(_state "installpath")
            elseif (${arg} STREQUAL "DOCTITLE")
                set(_state "doctitle")
            elseif (${arg} STREQUAL "WINDOWTITLE")
                set(_state "windowtitle")
            elseif (${arg} STREQUAL "AUTHOR")
                set(_state "author")
            elseif (${arg} STREQUAL "USE")
                set(_state "use")
            elseif (${arg} STREQUAL "VERSION")
                set(_state "version")
            else ()
                list(APPEND _javadoc_packages ${arg})
            endif ()
        elseif (${_state} STREQUAL "files")
            if (${arg} STREQUAL "PACKAGES")
                set(_state "packages")
            elseif (${arg} STREQUAL "SOURCEPATH")
                set(_state "sourcepath")
            elseif (${arg} STREQUAL "CLASSPATH")
                set(_state "classpath")
            elseif (${arg} STREQUAL "INSTALLPATH")
                set(_state "installpath")
            elseif (${arg} STREQUAL "DOCTITLE")
                set(_state "doctitle")
            elseif (${arg} STREQUAL "WINDOWTITLE")
                set(_state "windowtitle")
            elseif (${arg} STREQUAL "AUTHOR")
                set(_state "author")
            elseif (${arg} STREQUAL "USE")
                set(_state "use")
            elseif (${arg} STREQUAL "VERSION")
                set(_state "version")
            else ()
                list(APPEND _javadoc_files ${arg})
            endif ()
        elseif (${_state} STREQUAL "sourcepath")
            if (${arg} STREQUAL "PACKAGES")
                set(_state "packages")
            elseif (${arg} STREQUAL "FILES")
                set(_state "files")
            elseif (${arg} STREQUAL "CLASSPATH")
                set(_state "classpath")
            elseif (${arg} STREQUAL "INSTALLPATH")
                set(_state "installpath")
            elseif (${arg} STREQUAL "DOCTITLE")
                set(_state "doctitle")
            elseif (${arg} STREQUAL "WINDOWTITLE")
                set(_state "windowtitle")
            elseif (${arg} STREQUAL "AUTHOR")
                set(_state "author")
            elseif (${arg} STREQUAL "USE")
                set(_state "use")
            elseif (${arg} STREQUAL "VERSION")
                set(_state "version")
            else ()
                list(APPEND _javadoc_sourcepath ${arg})
            endif ()
        elseif (${_state} STREQUAL "classpath")
            if (${arg} STREQUAL "PACKAGES")
                set(_state "packages")
            elseif (${arg} STREQUAL "FILES")
                set(_state "files")
            elseif (${arg} STREQUAL "SOURCEPATH")
                set(_state "sourcepath")
            elseif (${arg} STREQUAL "INSTALLPATH")
                set(_state "installpath")
            elseif (${arg} STREQUAL "DOCTITLE")
                set(_state "doctitle")
            elseif (${arg} STREQUAL "WINDOWTITLE")
                set(_state "windowtitle")
            elseif (${arg} STREQUAL "AUTHOR")
                set(_state "author")
            elseif (${arg} STREQUAL "USE")
                set(_state "use")
            elseif (${arg} STREQUAL "VERSION")
                set(_state "version")
            else ()
                list(APPEND _javadoc_classpath ${arg})
            endif ()
        elseif (${_state} STREQUAL "installpath")
            if (${arg} STREQUAL "PACKAGES")
                set(_state "packages")
            elseif (${arg} STREQUAL "FILES")
                set(_state "files")
            elseif (${arg} STREQUAL "SOURCEPATH")
                set(_state "sourcepath")
            elseif (${arg} STREQUAL "DOCTITLE")
                set(_state "doctitle")
            elseif (${arg} STREQUAL "WINDOWTITLE")
                set(_state "windowtitle")
            elseif (${arg} STREQUAL "AUTHOR")
                set(_state "author")
            elseif (${arg} STREQUAL "USE")
                set(_state "use")
            elseif (${arg} STREQUAL "VERSION")
                set(_state "version")
            else ()
                set(_javadoc_installpath ${arg})
            endif ()
        elseif (${_state} STREQUAL "doctitle")
            if (${arg} STREQUAL "PACKAGES")
                set(_state "packages")
            elseif (${arg} STREQUAL "FILES")
                set(_state "files")
            elseif (${arg} STREQUAL "SOURCEPATH")
                set(_state "sourcepath")
            elseif (${arg} STREQUAL "INSTALLPATH")
                set(_state "installpath")
            elseif (${arg} STREQUAL "CLASSPATH")
                set(_state "classpath")
            elseif (${arg} STREQUAL "WINDOWTITLE")
                set(_state "windowtitle")
            elseif (${arg} STREQUAL "AUTHOR")
                set(_state "author")
            elseif (${arg} STREQUAL "USE")
                set(_state "use")
            elseif (${arg} STREQUAL "VERSION")
                set(_state "version")
            else ()
                set(_javadoc_doctitle ${arg})
            endif ()
        elseif (${_state} STREQUAL "windowtitle")
            if (${arg} STREQUAL "PACKAGES")
                set(_state "packages")
            elseif (${arg} STREQUAL "FILES")
                set(_state "files")
            elseif (${arg} STREQUAL "SOURCEPATH")
                set(_state "sourcepath")
            elseif (${arg} STREQUAL "CLASSPATH")
                set(_state "classpath")
            elseif (${arg} STREQUAL "INSTALLPATH")
                set(_state "installpath")
            elseif (${arg} STREQUAL "DOCTITLE")
                set(_state "doctitle")
            elseif (${arg} STREQUAL "AUTHOR")
                set(_state "author")
            elseif (${arg} STREQUAL "USE")
                set(_state "use")
            elseif (${arg} STREQUAL "VERSION")
                set(_state "version")
            else ()
                set(_javadoc_windowtitle ${arg})
            endif ()
        elseif (${_state} STREQUAL "author")
            if (${arg} STREQUAL "PACKAGES")
                set(_state "packages")
            elseif (${arg} STREQUAL "FILES")
                set(_state "files")
            elseif (${arg} STREQUAL "SOURCEPATH")
                set(_state "sourcepath")
            elseif (${arg} STREQUAL "CLASSPATH")
                set(_state "classpath")
            elseif (${arg} STREQUAL "INSTALLPATH")
                set(_state "installpath")
            elseif (${arg} STREQUAL "DOCTITLE")
                set(_state "doctitle")
            elseif (${arg} STREQUAL "WINDOWTITLE")
                set(_state "windowtitle")
            elseif (${arg} STREQUAL "AUTHOR")
                set(_state "author")
            elseif (${arg} STREQUAL "USE")
                set(_state "use")
            elseif (${arg} STREQUAL "VERSION")
                set(_state "version")
            else ()
                set(_javadoc_author ${arg})
            endif ()
        elseif (${_state} STREQUAL "use")
            if (${arg} STREQUAL "PACKAGES")
                set(_state "packages")
            elseif (${arg} STREQUAL "FILES")
                set(_state "files")
            elseif (${arg} STREQUAL "SOURCEPATH")
                set(_state "sourcepath")
            elseif (${arg} STREQUAL "CLASSPATH")
                set(_state "classpath")
            elseif (${arg} STREQUAL "INSTALLPATH")
                set(_state "installpath")
            elseif (${arg} STREQUAL "DOCTITLE")
                set(_state "doctitle")
            elseif (${arg} STREQUAL "WINDOWTITLE")
                set(_state "windowtitle")
            elseif (${arg} STREQUAL "AUTHOR")
                set(_state "author")
            elseif (${arg} STREQUAL "USE")
                set(_state "use")
            elseif (${arg} STREQUAL "VERSION")
                set(_state "version")
            else ()
                set(_javadoc_use ${arg})
            endif ()
        elseif (${_state} STREQUAL "version")
            if (${arg} STREQUAL "PACKAGES")
                set(_state "packages")
            elseif (${arg} STREQUAL "FILES")
                set(_state "files")
            elseif (${arg} STREQUAL "SOURCEPATH")
                set(_state "sourcepath")
            elseif (${arg} STREQUAL "CLASSPATH")
                set(_state "classpath")
            elseif (${arg} STREQUAL "INSTALLPATH")
                set(_state "installpath")
            elseif (${arg} STREQUAL "DOCTITLE")
                set(_state "doctitle")
            elseif (${arg} STREQUAL "WINDOWTITLE")
                set(_state "windowtitle")
            elseif (${arg} STREQUAL "AUTHOR")
                set(_state "author")
            elseif (${arg} STREQUAL "USE")
                set(_state "use")
            elseif (${arg} STREQUAL "VERSION")
                set(_state "version")
            else ()
                set(_javadoc_version ${arg})
            endif ()
        endif ()
    endforeach ()

    set(_javadoc_builddir ${CMAKE_CURRENT_BINARY_DIR}/javadoc/${_target})
    set(_javadoc_options -d ${_javadoc_builddir})

    if (_javadoc_sourcepath)
        set(_start TRUE)
        foreach(_path ${_javadoc_sourcepath})
            if (_start)
                set(_sourcepath ${_path})
                set(_start FALSE)
            else ()
                set(_sourcepath ${_sourcepath}:${_path})
            endif ()
        endforeach()
        set(_javadoc_options ${_javadoc_options} -sourcepath ${_sourcepath})
    endif ()

    if (_javadoc_classpath)
        set(_start TRUE)
        foreach(_path ${_javadoc_classpath})
            if (_start)
                set(_classpath ${_path})
                set(_start FALSE)
            else ()
                set(_classpath ${_classpath}:${_path})
            endif ()
        endforeach()
        set(_javadoc_options ${_javadoc_options} -classpath "${_classpath}")
    endif ()

    if (_javadoc_doctitle)
        set(_javadoc_options ${_javadoc_options} -doctitle '${_javadoc_doctitle}')
    endif ()

    if (_javadoc_windowtitle)
        set(_javadoc_options ${_javadoc_options} -windowtitle '${_javadoc_windowtitle}')
    endif ()

    if (_javadoc_author)
        set(_javadoc_options ${_javadoc_options} -author)
    endif ()

    if (_javadoc_use)
        set(_javadoc_options ${_javadoc_options} -use)
    endif ()

    if (_javadoc_version)
        set(_javadoc_options ${_javadoc_options} -version)
    endif ()

    add_custom_target(${_target}_javadoc ALL
        COMMAND ${Java_JAVADOC_EXECUTABLE} ${_javadoc_options}
                            ${_javadoc_files}
                            ${_javadoc_packages}
        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
    )

    install(
        DIRECTORY ${_javadoc_builddir}
        DESTINATION ${_javadoc_installpath}
    )
endfunction()

function (create_javah)
  if (Java_VERSION VERSION_GREATER_EQUAL 10)
    message (FATAL_ERROR "create_javah: not supported with this Java version. Use add_jar(GENERATE_NATIVE_HEADERS) instead.")
  elseif (Java_VERSION VERSION_GREATER_EQUAL 1.8)
    message (DEPRECATION "create_javah: this command will no longer be supported starting with version 10 of JDK. Update your project by using command add_jar(GENERATE_NATIVE_HEADERS) instead.")
  endif()

    cmake_parse_arguments(_create_javah
      ""
      "TARGET;GENERATED_FILES;OUTPUT_NAME;OUTPUT_DIR"
      "CLASSES;CLASSPATH;DEPENDS"
      ${ARGN})

    # ckeck parameters
    if (NOT _create_javah_TARGET AND NOT _create_javah_GENERATED_FILES)
      message (FATAL_ERROR "create_javah: TARGET or GENERATED_FILES must be specified.")
    endif()
    if (_create_javah_OUTPUT_NAME AND _create_javah_OUTPUT_DIR)
      message (FATAL_ERROR "create_javah: OUTPUT_NAME and OUTPUT_DIR are mutually exclusive.")
    endif()

    if (NOT _create_javah_CLASSES)
      message (FATAL_ERROR "create_javah: CLASSES is a required parameter.")
    endif()

    set (_output_files)
    if (WIN32 AND NOT CYGWIN AND CMAKE_HOST_SYSTEM_NAME MATCHES "Windows")
      set(_classpath_sep "$<SEMICOLON>")
    else ()
      set(_classpath_sep ":")
    endif()

    # handle javah options
    set (_javah_options)

    if (_create_javah_CLASSPATH)
      # CLASSPATH can specify directories, jar files or targets created with add_jar command
      set (_classpath)
      foreach (_path IN LISTS _create_javah_CLASSPATH)
        if (TARGET ${_path})
          get_target_property (_jar_path ${_path} JAR_FILE)
          if (_jar_path)
            list (APPEND _classpath "${_jar_path}")
            list (APPEND _create_javah_DEPENDS "${_path}")
          else()
            message(SEND_ERROR "create_javah: CLASSPATH target ${_path} is not a jar.")
          endif()
        elseif (EXISTS "${_path}")
          list (APPEND _classpath "${_path}")
          if (NOT IS_DIRECTORY "${_path}")
            list (APPEND _create_javah_DEPENDS "${_path}")
          endif()
        else()
          message(SEND_ERROR "create_javah: CLASSPATH entry ${_path} does not exist.")
        endif()
      endforeach()
      string (REPLACE ";" "${_classpath_sep}" _classpath "${_classpath}")
      list (APPEND _javah_options -classpath "${_classpath}")
    endif()

    if (_create_javah_OUTPUT_DIR)
      list (APPEND _javah_options -d "${_create_javah_OUTPUT_DIR}")
    endif()

    if (_create_javah_OUTPUT_NAME)
      list (APPEND _javah_options -o "${_create_javah_OUTPUT_NAME}")
      set (_output_files "${_create_javah_OUTPUT_NAME}")

      get_filename_component (_create_javah_OUTPUT_DIR "${_create_javah_OUTPUT_NAME}" DIRECTORY)
      get_filename_component (_create_javah_OUTPUT_DIR "${_create_javah_OUTPUT_DIR}" ABSOLUTE)
    endif()

    if (NOT _create_javah_OUTPUT_DIR)
      set (_create_javah_OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}")
    endif()

    if (NOT _create_javah_OUTPUT_NAME)
      # compute output names
      foreach (_class IN LISTS _create_javah_CLASSES)
        string (REPLACE "." "_" _c_header "${_class}")
        set (_c_header  "${_create_javah_OUTPUT_DIR}/${_c_header}.h")
        list (APPEND _output_files "${_c_header}")
      endforeach()
    endif()

    # finalize custom command arguments
    if (_create_javah_DEPENDS)
      list (INSERT _create_javah_DEPENDS 0 DEPENDS)
    endif()

    add_custom_command (OUTPUT ${_output_files}
      COMMAND "${Java_JAVAH_EXECUTABLE}" ${_javah_options} -jni ${_create_javah_CLASSES}
      ${_create_javah_DEPENDS}
      WORKING_DIRECTORY ${_create_javah_OUTPUT_DIR}
      COMMENT "Building C header files from classes...")

    if (_create_javah_TARGET)
      add_custom_target (${_create_javah_TARGET} ALL DEPENDS ${_output_files})
    endif()
    if (_create_javah_GENERATED_FILES)
      set (${_create_javah_GENERATED_FILES} ${_output_files} PARENT_SCOPE)
    endif()
endfunction()

function(export_jars)
    # Parse and validate arguments
    cmake_parse_arguments(_export_jars
      ""
      "FILE;NAMESPACE"
      "TARGETS"
      ${ARGN}
    )
    if (NOT _export_jars_FILE)
      message(SEND_ERROR "export_jars: FILE must be specified.")
    endif()
    if (NOT _export_jars_TARGETS)
      message(SEND_ERROR "export_jars: TARGETS must be specified.")
    endif()
    set(_jar_NAMESPACE "${_export_jars_NAMESPACE}")

    # Set content of generated exports file
    string(REPLACE ";" " " __targets__ "${_export_jars_TARGETS}")
    set(__targetdefs__ "")
    foreach(_target ${_export_jars_TARGETS})
        get_target_property(_jarpath ${_target} JAR_FILE)
        get_filename_component(_jarpath ${_jarpath} PATH)
        __java_export_jar(__targetdefs__ ${_target} "${_jarpath}")
    endforeach()

    # Generate exports file
    configure_file(
      ${_JAVA_EXPORT_TARGETS_SCRIPT}
      ${_export_jars_FILE}
      @ONLY
    )
endfunction()

function(install_jar_exports)
    # Parse and validate arguments
    cmake_parse_arguments(_install_jar_exports
      ""
      "FILE;DESTINATION;COMPONENT;NAMESPACE"
      "TARGETS"
      ${ARGN}
    )
    if (NOT _install_jar_exports_FILE)
      message(SEND_ERROR "install_jar_exports: FILE must be specified.")
    endif()
    if (NOT _install_jar_exports_DESTINATION)
      message(SEND_ERROR "install_jar_exports: DESTINATION must be specified.")
    endif()
    if (NOT _install_jar_exports_TARGETS)
      message(SEND_ERROR "install_jar_exports: TARGETS must be specified.")
    endif()
    set(_jar_NAMESPACE "${_install_jar_exports_NAMESPACE}")

    if (_install_jar_exports_COMPONENT)
      set (_COMPONENT COMPONENT ${_install_jar_exports_COMPONENT})
    endif()

    # Determine relative path from installed export file to install prefix
    if(IS_ABSOLUTE ${_install_jar_exports_DESTINATION})
      file(RELATIVE_PATH _relpath
        ${_install_jar_exports_DESTINATION}
        ${CMAKE_INSTALL_PREFIX}
      )
    else()
      file(RELATIVE_PATH _relpath
        ${CMAKE_INSTALL_PREFIX}/${_install_jar_exports_DESTINATION}
        ${CMAKE_INSTALL_PREFIX}
      )
    endif()

    # Set up unique location for generated exports file
    string(SHA256 _hash "${_install_jar_exports_DESTINATION}")
    set(_tmpdir ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/JavaExports/${_hash})

    # Set content of generated exports file
    string(REPLACE ";" " " __targets__ "${_install_jar_exports_TARGETS}")
    set(__targetdefs__ "set(_prefix \${CMAKE_CURRENT_LIST_DIR}/${_relpath})\n\n")
    foreach(_target ${_install_jar_exports_TARGETS})
        get_target_property(_dir ${_target} INSTALL_DESTINATION)
        __java_export_jar(__targetdefs__ ${_target} "\${_prefix}/${_dir}")
    endforeach()
    __java_lcat(__targetdefs__ "\nunset(_prefix)")

    # Generate and install exports file
    configure_file(
      ${_JAVA_EXPORT_TARGETS_SCRIPT}
      ${_tmpdir}/${_install_jar_exports_FILE}
      @ONLY
    )
    install(FILES ${_tmpdir}/${_install_jar_exports_FILE}
            DESTINATION ${_install_jar_exports_DESTINATION}
            ${_COMPONENT})
endfunction()