UseJava: Move helper scripts to subdirectory

Also, exclude them from the help module index.

Modules/UseJava/ClassFilelist.cmake

@@ -0,0 +1,40 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+# This script creates a list of compiled Java class files to be added to
+# a jar file.  This avoids including cmake files which get created in
+# the binary directory.
+
+if (CMAKE_JAVA_CLASS_OUTPUT_PATH)
+    if (EXISTS "${CMAKE_JAVA_CLASS_OUTPUT_PATH}")
+
+        set(_JAVA_GLOBBED_FILES)
+        if (CMAKE_JAR_CLASSES_PREFIX)
+            foreach(JAR_CLASS_PREFIX ${CMAKE_JAR_CLASSES_PREFIX})
+                message(STATUS "JAR_CLASS_PREFIX: ${JAR_CLASS_PREFIX}")
+
+                file(GLOB_RECURSE _JAVA_GLOBBED_TMP_FILES "${CMAKE_JAVA_CLASS_OUTPUT_PATH}/${JAR_CLASS_PREFIX}/*.class")
+                if (_JAVA_GLOBBED_TMP_FILES)
+                    list(APPEND _JAVA_GLOBBED_FILES ${_JAVA_GLOBBED_TMP_FILES})
+                endif ()
+            endforeach()
+        else()
+            file(GLOB_RECURSE _JAVA_GLOBBED_FILES "${CMAKE_JAVA_CLASS_OUTPUT_PATH}/*.class")
+        endif ()
+
+        set(_JAVA_CLASS_FILES)
+        # file(GLOB_RECURSE foo RELATIVE) is broken so we need this.
+        foreach(_JAVA_GLOBBED_FILE ${_JAVA_GLOBBED_FILES})
+            file(RELATIVE_PATH _JAVA_CLASS_FILE ${CMAKE_JAVA_CLASS_OUTPUT_PATH} ${_JAVA_GLOBBED_FILE})
+            set(_JAVA_CLASS_FILES ${_JAVA_CLASS_FILES}${_JAVA_CLASS_FILE}\n)
+        endforeach()
+
+        # write to file
+        file(WRITE ${CMAKE_JAVA_CLASS_OUTPUT_PATH}/java_class_filelist ${_JAVA_CLASS_FILES})
+
+    else ()
+        message(SEND_ERROR "FATAL: Java class output path doesn't exist")
+    endif ()
+else ()
+    message(SEND_ERROR "FATAL: Can't find CMAKE_JAVA_CLASS_OUTPUT_PATH")
+endif ()

Modules/UseJava/Symlinks.cmake

@@ -0,0 +1,20 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+# Helper script for UseJava.cmake
+
+if (UNIX AND _JAVA_TARGET_OUTPUT_LINK)
+    if (_JAVA_TARGET_OUTPUT_NAME)
+        find_program(LN_EXECUTABLE
+            NAMES
+                ln
+        )
+
+        execute_process(
+            COMMAND ${LN_EXECUTABLE} -sf "${_JAVA_TARGET_OUTPUT_NAME}" "${_JAVA_TARGET_OUTPUT_LINK}"
+            WORKING_DIRECTORY ${_JAVA_TARGET_DIR}
+        )
+    else ()
+        message(SEND_ERROR "FATAL: Can't find _JAVA_TARGET_OUTPUT_NAME")
+    endif ()
+endif ()

Modules/UseJava/javaTargets.cmake.in

@@ -0,0 +1,39 @@
+cmake_minimum_required(VERSION 2.8)
+cmake_policy(PUSH)
+cmake_policy(VERSION 2.8)
+
+#----------------------------------------------------------------
+# Generated CMake Java target import file.
+#----------------------------------------------------------------
+
+# Protect against multiple inclusion, which would fail when already imported targets are added once more.
+set(_targetsDefined)
+set(_targetsNotDefined)
+set(_expectedTargets)
+foreach(_expectedTarget @__targets__@)
+  list(APPEND _expectedTargets ${_expectedTarget})
+  if(TARGET ${_expectedTarget})
+    list(APPEND _targetsDefined ${_expectedTarget})
+  else()
+    list(APPEND _targetsNotDefined ${_expectedTarget})
+  endif()
+endforeach()
+if("%${_targetsDefined}" STREQUAL "%${_expectedTargets}")
+  unset(_targetsDefined)
+  unset(_targetsNotDefined)
+  unset(_expectedTargets)
+  cmake_policy(POP)
+  return()
+endif()
+if(NOT "${_targetsDefined}" STREQUAL "")
+  message(FATAL_ERROR
+    "Some (but not all) targets in this export set were already defined.\n"
+    "Targets Defined: ${_targetsDefined}\n"
+    "Targets not yet defined: ${_targetsNotDefined}\n")
+endif()
+unset(_targetsDefined)
+unset(_targetsNotDefined)
+unset(_expectedTargets)
+
+@__targetdefs__@
+cmake_policy(POP)