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

#.rst:
# FindJava
# --------
#
# Find Java
#
# This module finds if Java is installed and determines where the
# include files and libraries are.  The caller may set variable JAVA_HOME
# to specify a Java installation prefix explicitly.
#
# See also the :module:`FindJNI` module to find Java development tools.
#
# Specify one or more of the following components as you call this find module. See example below.
#
# ::
#
#   Runtime     = User just want to execute some Java byte-compiled
#   Development = Development tools (java, javac, javah and javadoc), includes Runtime component
#   IdlJ        = idl compiler for Java
#   JarSigner   = signer tool for jar
#
#
# This module sets the following result variables:
#
# ::
#
#   Java_JAVA_EXECUTABLE      = the full path to the Java runtime
#   Java_JAVAC_EXECUTABLE     = the full path to the Java compiler
#   Java_JAVAH_EXECUTABLE     = the full path to the Java header generator
#   Java_JAVADOC_EXECUTABLE   = the full path to the Java documentation generator
#   Java_IDLJ_EXECUTABLE      = the full path to the Java idl compiler
#   Java_JAR_EXECUTABLE       = the full path to the Java archiver
#   Java_JARSIGNER_EXECUTABLE = the full path to the Java jar signer
#   Java_VERSION_STRING       = Version of java found, eg. 1.6.0_12
#   Java_VERSION_MAJOR        = The major version of the package found.
#   Java_VERSION_MINOR        = The minor version of the package found.
#   Java_VERSION_PATCH        = The patch version of the package found.
#   Java_VERSION_TWEAK        = The tweak version of the package found (after '_')
#   Java_VERSION              = This is set to: $major.$minor.$patch(.$tweak)
#
#
#
# The minimum required version of Java can be specified using the
# standard CMake syntax, e.g.  find_package(Java 1.5)
#
# NOTE: ${Java_VERSION} and ${Java_VERSION_STRING} are not guaranteed to
# be identical.  For example some java version may return:
# Java_VERSION_STRING = 1.5.0_17 and Java_VERSION = 1.5.0.17
#
# another example is the Java OEM, with: Java_VERSION_STRING = 1.6.0-oem
# and Java_VERSION = 1.6.0
#
# For these components the following variables are set:
#
# ::
#
#   Java_FOUND                    - TRUE if all components are found.
#   Java_<component>_FOUND        - TRUE if <component> is found.
#
#
#
# Example Usages:
#
# ::
#
#   find_package(Java)
#   find_package(Java COMPONENTS Runtime)
#   find_package(Java COMPONENTS Development)

include(${CMAKE_CURRENT_LIST_DIR}/CMakeFindJavaCommon.cmake)

# The HINTS option should only be used for values computed from the system.
set(_JAVA_HINTS)
if(_JAVA_HOME)
  list(APPEND _JAVA_HINTS ${_JAVA_HOME}/bin)
endif()
list(APPEND _JAVA_HINTS
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\2.0;JavaHome]/bin"
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\1.9;JavaHome]/bin"
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\1.8;JavaHome]/bin"
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\1.7;JavaHome]/bin"
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\1.6;JavaHome]/bin"
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\1.5;JavaHome]/bin"
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\1.4;JavaHome]/bin"
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\1.3;JavaHome]/bin"
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Runtime Environment\\2.0;JavaHome]/bin"
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Runtime Environment\\1.9;JavaHome]/bin"
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Runtime Environment\\1.8;JavaHome]/bin"
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Runtime Environment\\1.7;JavaHome]/bin"
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Runtime Environment\\1.6;JavaHome]/bin"
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Runtime Environment\\1.5;JavaHome]/bin"
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Runtime Environment\\1.4;JavaHome]/bin"
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Runtime Environment\\1.3;JavaHome]/bin"
  )
# Hard-coded guesses should still go in PATHS. This ensures that the user
# environment can always override hard guesses.
set(_JAVA_PATHS
  /usr/lib/java/bin
  /usr/share/java/bin
  /usr/local/java/bin
  /usr/local/java/share/bin
  /usr/java/j2sdk1.4.2_04
  /usr/lib/j2sdk1.4-sun/bin
  /usr/java/j2sdk1.4.2_09/bin
  /usr/lib/j2sdk1.5-sun/bin
  /opt/sun-jdk-1.5.0.04/bin
  /usr/local/jdk-1.7.0/bin
  /usr/local/jdk-1.6.0/bin
  )
find_program(Java_JAVA_EXECUTABLE
  NAMES java
  HINTS ${_JAVA_HINTS}
  PATHS ${_JAVA_PATHS}
)

if(Java_JAVA_EXECUTABLE)
    execute_process(COMMAND ${Java_JAVA_EXECUTABLE} -version
      RESULT_VARIABLE res
      OUTPUT_VARIABLE var
      ERROR_VARIABLE var # sun-java output to stderr
      OUTPUT_STRIP_TRAILING_WHITESPACE
      ERROR_STRIP_TRAILING_WHITESPACE)
    if( res )
      if(var MATCHES "No Java runtime present, requesting install")
        set_property(CACHE Java_JAVA_EXECUTABLE
          PROPERTY VALUE "Java_JAVA_EXECUTABLE-NOTFOUND")
      elseif(${Java_FIND_REQUIRED})
        message( FATAL_ERROR "Error executing java -version" )
      else()
        message( STATUS "Warning, could not run java -version")
      endif()
    else()
      # extract major/minor version and patch level from "java -version" output
      # Tested on linux using
      # 1. Sun / Sun OEM
      # 2. OpenJDK 1.6
      # 3. GCJ 1.5
      # 4. Kaffe 1.4.2
      # 5. OpenJDK 1.7.x on OpenBSD
      if(var MATCHES "java version \"([0-9]+\\.[0-9]+\\.[0-9_.]+.*)\"")
        # This is most likely Sun / OpenJDK, or maybe GCJ-java compat layer
        set(Java_VERSION_STRING "${CMAKE_MATCH_1}")
      elseif(var MATCHES "openjdk version \"([0-9]+)-[A-Za-z]+\"")
        # OpenJDK 9 early access builds or locally built
        set(Java_VERSION_STRING "1.${CMAKE_MATCH_1}.0")
      elseif(var MATCHES "java full version \"kaffe-([0-9]+\\.[0-9]+\\.[0-9_]+)\"")
        # Kaffe style
        set(Java_VERSION_STRING "${CMAKE_MATCH_1}")
      elseif(var MATCHES "openjdk version \"([0-9]+\\.[0-9]+\\.[0-9_]+.*)\"")
        # OpenJDK ver 1.7.x on OpenBSD
        set(Java_VERSION_STRING "${CMAKE_MATCH_1}")
      else()
        if(NOT Java_FIND_QUIETLY)
          message(WARNING "regex not supported: ${var}. Please report")
        endif()
      endif()
      string( REGEX REPLACE "([0-9]+).*" "\\1" Java_VERSION_MAJOR "${Java_VERSION_STRING}" )
      string( REGEX REPLACE "[0-9]+\\.([0-9]+).*" "\\1" Java_VERSION_MINOR "${Java_VERSION_STRING}" )
      string( REGEX REPLACE "[0-9]+\\.[0-9]+\\.([0-9]+).*" "\\1" Java_VERSION_PATCH "${Java_VERSION_STRING}" )
      # warning tweak version can be empty:
      string( REGEX REPLACE "[0-9]+\\.[0-9]+\\.[0-9]+[_\\.]?([0-9]*).*$" "\\1" Java_VERSION_TWEAK "${Java_VERSION_STRING}" )
      if( Java_VERSION_TWEAK STREQUAL "" ) # check case where tweak is not defined
        set(Java_VERSION ${Java_VERSION_MAJOR}.${Java_VERSION_MINOR}.${Java_VERSION_PATCH})
      else()
        set(Java_VERSION ${Java_VERSION_MAJOR}.${Java_VERSION_MINOR}.${Java_VERSION_PATCH}.${Java_VERSION_TWEAK})
      endif()
    endif()

endif()


find_program(Java_JAR_EXECUTABLE
  NAMES jar
  HINTS ${_JAVA_HINTS}
  PATHS ${_JAVA_PATHS}
)

find_program(Java_JAVAC_EXECUTABLE
  NAMES javac
  HINTS ${_JAVA_HINTS}
  PATHS ${_JAVA_PATHS}
)

find_program(Java_JAVAH_EXECUTABLE
  NAMES javah
  HINTS ${_JAVA_HINTS}
  PATHS ${_JAVA_PATHS}
)

find_program(Java_JAVADOC_EXECUTABLE
  NAMES javadoc
  HINTS ${_JAVA_HINTS}
  PATHS ${_JAVA_PATHS}
)

find_program(Java_IDLJ_EXECUTABLE
  NAMES idlj
  HINTS ${_JAVA_HINTS}
  PATHS ${_JAVA_PATHS}
)

find_program(Java_JARSIGNER_EXECUTABLE
  NAMES jarsigner
  HINTS ${_JAVA_HINTS}
  PATHS ${_JAVA_PATHS}
)

include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
if(Java_FIND_COMPONENTS)
  set(_JAVA_REQUIRED_VARS)
  foreach(component ${Java_FIND_COMPONENTS})
    # User just want to execute some Java byte-compiled
    If(component STREQUAL "Runtime")
      list(APPEND _JAVA_REQUIRED_VARS Java_JAVA_EXECUTABLE)
      if(Java_JAVA_EXECUTABLE)
        set(Java_Runtime_FOUND TRUE)
      endif()
    elseif(component STREQUAL "Development")
      list(APPEND _JAVA_REQUIRED_VARS Java_JAVA_EXECUTABLE Java_JAVAC_EXECUTABLE
                                      Java_JAVAH_EXECUTABLE Java_JAVADOC_EXECUTABLE)
      if(Java_JAVA_EXECUTABLE AND Java_JAVAC_EXECUTABLE
          AND Java_JAVAH_EXECUTABLE AND Java_JAVADOC_EXECUTABLE)
        set(Java_Development_FOUND TRUE)
      endif()
    elseif(component STREQUAL "IdlJ")
      list(APPEND _JAVA_REQUIRED_VARS Java_IDLJ_EXECUTABLE)
      if(Java_IDLJ_EXECUTABLE)
        set(Java_IdlJ_FOUND TRUE)
      endif()
    elseif(component STREQUAL "JarSigner")
      list(APPEND _JAVA_REQUIRED_VARS Java_JARSIGNER_EXECUTABLE)
      if(Java_JARSIGNER_EXECUTABLE)
        set(Java_JarSigner_FOUND TRUE)
      endif()
    else()
      message(FATAL_ERROR "Comp: ${component} is not handled")
    endif()
  endforeach()
  list (REMOVE_DUPLICATES _JAVA_REQUIRED_VARS)
  find_package_handle_standard_args(Java
    REQUIRED_VARS ${_JAVA_REQUIRED_VARS} HANDLE_COMPONENTS
    VERSION_VAR Java_VERSION
    )
  if(Java_FOUND)
    foreach(component ${Java_FIND_COMPONENTS})
      set(Java_${component}_FOUND TRUE)
    endforeach()
  endif()
else()
  # Check for Development
  find_package_handle_standard_args(Java
    REQUIRED_VARS Java_JAVA_EXECUTABLE Java_JAR_EXECUTABLE Java_JAVAC_EXECUTABLE
                  Java_JAVAH_EXECUTABLE Java_JAVADOC_EXECUTABLE
    VERSION_VAR Java_VERSION
    )
endif()


mark_as_advanced(
  Java_JAVA_EXECUTABLE
  Java_JAR_EXECUTABLE
  Java_JAVAC_EXECUTABLE
  Java_JAVAH_EXECUTABLE
  Java_JAVADOC_EXECUTABLE
  Java_IDLJ_EXECUTABLE
  Java_JARSIGNER_EXECUTABLE
  )

# LEGACY
set(JAVA_RUNTIME ${Java_JAVA_EXECUTABLE})
set(JAVA_ARCHIVE ${Java_JAR_EXECUTABLE})
set(JAVA_COMPILE ${Java_JAVAC_EXECUTABLE})