Add JNI implementation for SystemTime class

CMakeLists.txt

@@ -32,6 +32,7 @@ option(LS_STD_BUILD_WITH_TESTS "Build project with tests..." OFF)
 option(LS_STD_BUILD_WITH_SUPPORTED_COMPILER "Build project with supported compiler only..." ON)
 option(LS_STD_BUILD_STATIC "Build ls-std static library..." ON)
 option(LS_STD_BUILD_SHARED "Build ls-std shared library..." OFF)
+option(LS_STD_BUILD_WITH_JNI "Build ls-std shared library with JNI..." OFF)
 
 set(TARGET_COUNTER 0)
 
@@ -57,6 +58,19 @@ if (TARGET_COUNTER EQUAL 0)
     return()
 endif ()
 
+##########################################################
+# JNI flag check
+##########################################################
+
+if (${LS_STD_BUILD_WITH_JNI})
+    if (${LS_STD_BUILD_SHARED})
+        message("${PROJECT_NAME}: build with JNI support...")
+    else ()
+        message("${PROJECT_NAME}: [Error] JNI support requires shared build goal!")
+        return()
+    endif ()
+endif ()
+
 ##########################################################
 # Compiler Settings
 ##########################################################
@@ -80,11 +94,27 @@ if(${LS_STD_BUILD_WITH_SUPPORTED_COMPILER})
             ${CMAKE_CXX_COMPILER_ID} STREQUAL Clang OR
             ${CMAKE_CXX_COMPILER_ID} STREQUAL AppleClang)
         message("${PROJECT_NAME}: ${CMAKE_CXX_COMPILER_ID} ${CMAKE_CXX_COMPILER_VERSION} is supported...")
-    else()
+    else ()
         message("${PROJECT_NAME}: [Error] ${CMAKE_CXX_COMPILER_ID} ${CMAKE_CXX_COMPILER_VERSION} is not supported... terminated!")
         return()
     endif ()
-endif()
+endif ()
+
+######################################################
+# Find Packages
+######################################################
+
+if (${LS_STD_BUILD_WITH_JNI})
+    if (DEFINED ENV{JAVA_HOME})
+        message("JAVA_HOME found in '$ENV{JAVA_HOME}' location...")
+    else ()
+        message("[Error] JAVA_HOME not found!")
+        return()
+    endif ()
+
+    message("${PROJECT_NAME}: finding JNI package in '$ENV{JAVA_HOME}'...")
+    find_package(JNI REQUIRED)
+endif ()
 
 ######################################################
 # Include Directories
@@ -92,6 +122,12 @@ endif()
 
 message("${PROJECT_NAME}: Adding include directories...")
 
+if (${LS_STD_BUILD_WITH_JNI})
+    include_directories(${JAVA_INCLUDE_PATH})
+    include_directories(${JAVA_INCLUDE_PATH2})
+    include_directories(${JAVA_AWT_INCLUDE_PATH})
+endif ()
+
 if (${LS_STD_BUILD_WITH_TESTS})
     include_directories(${CMAKE_CURRENT_SOURCE_DIR}/test)
     include_directories(${CMAKE_CURRENT_LIST_DIR}/test/lib/${GOOGLE_TEST_MODULE}/googletest/include)
@@ -224,6 +260,9 @@ set(SOURCE_FILES_TIME
         ${CMAKE_CURRENT_SOURCE_DIR}/source/ls-std/time/system-time/SystemTimeParameter.cpp
         ${CMAKE_CURRENT_SOURCE_DIR}/source/ls-std/time/Date.cpp)
 
+set(SOURCE_FILES_TIME_JNI
+        ${CMAKE_CURRENT_SOURCE_DIR}/source/ls-std/time/system-time/jni/com_lynarstudios_ls_std_time_systemtime_SystemTimeJni.cpp)
+
 ####################################################################################################################
 ####################################################################################################################
 ####################################################################################################################
@@ -589,9 +628,16 @@ if (${LS_STD_BUILD_STATIC})
 endif ()
 
 if (${LS_STD_BUILD_SHARED})
-    add_library("${MODULE_NAME_TIME}" SHARED ${SOURCE_FILES_TIME})
-    target_link_libraries("${MODULE_NAME_TIME}" ${MODULE_NAME_CORE})
-    set_target_properties("${MODULE_NAME_TIME}" PROPERTIES DEBUG_POSTFIX "-d")
+    if (${LS_STD_BUILD_WITH_JNI})
+        message("${MODULE_NAME_TIME}: building with JNI...")
+        add_library("${MODULE_NAME_TIME}" SHARED ${SOURCE_FILES_TIME} ${SOURCE_FILES_TIME_JNI})
+        target_link_libraries("${MODULE_NAME_TIME}" ${MODULE_NAME_CORE})
+        set_target_properties("${MODULE_NAME_TIME}" PROPERTIES DEBUG_POSTFIX "-d")
+    else ()
+        add_library("${MODULE_NAME_TIME}" SHARED ${SOURCE_FILES_TIME})
+        target_link_libraries("${MODULE_NAME_TIME}" ${MODULE_NAME_CORE})
+        set_target_properties("${MODULE_NAME_TIME}" PROPERTIES DEBUG_POSTFIX "-d")
+    endif ()
 endif ()
 
 ####################################################################################################################

README.md

@@ -107,6 +107,7 @@ Alternatively, the CMake project generation can be controlled by providing libra
 | __LS_STD_BUILD_WITH_SUPPORTED_COMPILER__ | ON            | This flag enforces the usage of supported compilers, only.<br/>For usage of an unsupported toolchain, set this flag to __OFF__.                      |
 | __LS_STD_BUILD_STATIC__                  | ON            | This flag indicates, that all library modules should be built as static goals.  <br/>Please note, that __LS_STD_BUILD_SHARED__ has to be turned off. |
 | __LS_STD_BUILD_SHARED__                  | OFF           | This flag indicates, that all library modules should be built as shared goals.  <br/>Please note, that __LS_STD_BUILD_STATIC__ has to be turned off. |
+| __LS_STD_BUILD_WITH_JNI__                | OFF           | This flag enables the build of JNI dependencies.  <br/>Please note, that __LS_STD_BUILD_SHARED__ has to be turned on.                                |
 
 To use one or more of these flags, you'd have to adjust previous command, like:
 

include/ls-std/ls-std-time.hpp

@@ -3,7 +3,7 @@
  * Company:         Lynar Studios
  * E-Mail:          webmaster@lynarstudios.com
  * Created:         2022-05-16
- * Changed:         2023-03-15
+ * Changed:         2023-03-16
  *
  * */
 
@@ -14,6 +14,7 @@
 #include <ls-std/time/system-time/PosixClock.hpp>
 #include <ls-std/time/system-time/SystemTime.hpp>
 #include <ls-std/time/system-time/SystemTimeParameter.hpp>
+#include <ls-std/time/system-time/jni/com_lynarstudios_ls_std_time_systemtime_SystemTimeJni.h>
 
 #include <ls-std/time/Date.hpp>
 

include/ls-std/time/system-time/jni/com_lynarstudios_ls_std_time_systemtime_SystemTimeJni.h

@@ -0,0 +1,20 @@
+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+/* Header for class com_lynarstudios_ls_std_time_systemtime_SystemTimeJni */
+
+#ifndef _Included_com_lynarstudios_ls_std_time_systemtime_SystemTimeJni
+  #define _Included_com_lynarstudios_ls_std_time_systemtime_SystemTimeJni
+  #ifdef __cplusplus
+extern "C" {
+  #endif
+/*
+ * Class:     com_lynarstudios_ls_std_time_systemtime_SystemTimeJni
+ * Method:    set
+ * Signature: (J)Z
+ */
+JNIEXPORT jboolean JNICALL Java_com_lynarstudios_ls_std_time_systemtime_SystemTimeJni_set(JNIEnv *, jobject, jlong);
+
+  #ifdef __cplusplus
+}
+  #endif
+#endif

source/ls-std/time/system-time/jni/com_lynarstudios_ls_std_time_systemtime_SystemTimeJni.cpp

@@ -0,0 +1,18 @@
+/*
+* Author:          Patrick-Christopher Mattulat
+* Company:         Lynar Studios
+* E-Mail:          webmaster@lynarstudios.com
+* Created:         2023-03-16
+* Changed:         2023-03-16
+*
+* */
+
+#include <ls-std/time/system-time/SystemTime.hpp>
+#include <ls-std/time/system-time/jni/com_lynarstudios_ls_std_time_systemtime_SystemTimeJni.h>
+
+using ls::std::time::SystemTime;
+
+JNIEXPORT jboolean JNICALL Java_com_lynarstudios_ls_std_time_systemtime_SystemTimeJni_set(JNIEnv *_environment, jobject _object, jlong _long)
+{
+  return SystemTime{}.set(_long);
+}