From 8d907d2e3239847299b9da808e290dcab94cbb3b Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.a.alekhin@gmail.com>
Date: Fri, 14 Dec 2018 00:15:57 +0000
Subject: [PATCH] cmake(java): add
 OPENCV_JAVA_SOURCE_VERSION/OPENCV_JAVA_TARGET_VERSION

---
 cmake/OpenCVDetectApacheAnt.cmake | 3 +++
 modules/java/jar/CMakeLists.txt   | 7 +++++++
 modules/java/jar/build.xml.in     | 2 +-
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/cmake/OpenCVDetectApacheAnt.cmake b/cmake/OpenCVDetectApacheAnt.cmake
index 989cb4075b..2f8243838e 100644
--- a/cmake/OpenCVDetectApacheAnt.cmake
+++ b/cmake/OpenCVDetectApacheAnt.cmake
@@ -1,3 +1,6 @@
+set(OPENCV_JAVA_SOURCE_VERSION "" CACHE STRING "Java source version (javac Ant target)")
+set(OPENCV_JAVA_TARGET_VERSION "" CACHE STRING "Java target version (javac Ant target)")
+
 file(TO_CMAKE_PATH "$ENV{ANT_DIR}" ANT_DIR_ENV_PATH)
 file(TO_CMAKE_PATH "$ENV{ProgramFiles}" ProgramFiles_ENV_PATH)
 
diff --git a/modules/java/jar/CMakeLists.txt b/modules/java/jar/CMakeLists.txt
index d34a8e26bf..0e16e3b5eb 100644
--- a/modules/java/jar/CMakeLists.txt
+++ b/modules/java/jar/CMakeLists.txt
@@ -18,6 +18,13 @@ set(depends gen_opencv_java_source "${OPENCV_DEPHELPER}/gen_opencv_java_source")
 ocv_copyfiles_add_target(${the_module}_jar_source_copy JAVA_SRC_COPY "Copy Java(JAR) source files" ${depends})
 set(depends ${the_module}_jar_source_copy "${OPENCV_DEPHELPER}/${the_module}_jar_source_copy")
 
+if(OPENCV_JAVA_SOURCE_VERSION)
+  set(OPENCV_ANT_JAVAC_EXTRA_ATTRS "${OPENCV_ANT_JAVAC_EXTRA_ATTRS} source=\"${OPENCV_JAVA_SOURCE_VERSION}\"")
+endif()
+if(OPENCV_JAVA_TARGET_VERSION)
+  set(OPENCV_ANT_JAVAC_EXTRA_ATTRS "${OPENCV_ANT_JAVAC_EXTRA_ATTRS} target=\"${OPENCV_JAVA_TARGET_VERSION}\"")
+endif()
+
 configure_file("${CMAKE_CURRENT_SOURCE_DIR}/build.xml.in" "${OPENCV_JAVA_DIR}/build.xml" @ONLY)
 list(APPEND depends "${OPENCV_JAVA_DIR}/build.xml")
 
diff --git a/modules/java/jar/build.xml.in b/modules/java/jar/build.xml.in
index d4f01931b2..41b55b76fc 100644
--- a/modules/java/jar/build.xml.in
+++ b/modules/java/jar/build.xml.in
@@ -11,7 +11,7 @@
     <!-- This is to make a jar with a source attachment, for e.g. easy -->
     <!-- navigation in Eclipse. See this question: -->
     <!-- http://stackoverflow.com/questions/3584968/ant-how-to-compile-jar-that-includes-source-attachment -->
-    <javac sourcepath="" srcdir="java" destdir="build/classes" debug="on" includeantruntime="false" >
+    <javac sourcepath="" srcdir="java" destdir="build/classes" debug="on" includeantruntime="false" @OPENCV_ANT_JAVAC_EXTRA_ATTRS@ >
       <include name="**/*.java"/>
       <compilerarg line="-encoding utf-8"/>
     </javac>