helper_jni: Add checkAndGetObject(..)

1 files changed, 13 insertions, 0 deletions

diff --git a/include/jau/jni/helper_jni.hpp b/include/jau/jni/helper_jni.hpp
index 452b462..9a60895 100644
--- a/include/jau/jni/helper_jni.hpp
+++ b/include/jau/jni/helper_jni.hpp
@@ -153,6 +153,19 @@ namespace jau {
                     throw RuntimeException("JavaGlobalObj::check: Null object", file, line);
                 }
             }
+            static inline jobject checkAndGetObject(const std::shared_ptr<JavaAnon> & shref, const char* file, int line) {
+                if( nullptr == shref ) {
+                    throw RuntimeException("JavaGlobalObj::check: Null shared-JavaAnonObj", file, line);
+                }
+                if( 0 == shref.use_count() ) { // safe-guard for concurrent dtor
+                    throw RuntimeException("JavaGlobalObj::check: Empty shared-JavaAnonObj", file, line);
+                }
+                const jobject obj = static_cast<const JavaGlobalObj*>(shref.get())->getObject();
+                if( nullptr == obj ) {
+                    throw RuntimeException("JavaGlobalObj::check: Null object", file, line);
+                }
+                return obj;
+            }
             static bool isValid(const std::shared_ptr<JavaAnon> & shref) noexcept {
                 if( nullptr == shref || 0 == shref.use_count() ) {
                     return false;