Add closeFile operation to JSON backend

Author: franzpoeschel

include/openPMD/IO/JSON/JSONIOHandlerImpl.hpp

@@ -184,6 +184,11 @@ namespace openPMD
             Parameter< Operation::OPEN_FILE > const &
         ) override;
 
+        void closeFile(
+            Writable *,
+            Parameter< Operation::CLOSE_FILE > const &
+        ) override;
+
         void openPath(
             Writable *,
             Parameter< Operation::OPEN_PATH > const &

src/IO/JSON/JSONIOHandlerImpl.cpp

@@ -306,6 +306,21 @@ namespace openPMD
     }
 
 
+    void JSONIOHandlerImpl::closeFile(
+        Writable * writable,
+        Parameter< Operation::CLOSE_FILE > const &
+    )
+    {
+        auto fileIterator = m_files.find( writable );
+        if ( fileIterator != m_files.end( ) )
+        {
+            putJsonContents( fileIterator->second );
+            fileIterator->second.invalidate( );
+            m_files.erase( fileIterator );
+        }
+    }
+
+
     void JSONIOHandlerImpl::openPath(
         Writable * writable,
         Parameter< Operation::OPEN_PATH > const & parameters

test/SerialIOTest.cpp

@@ -144,7 +144,10 @@ close_iteration_test( std::string file_ending )
 
 TEST_CASE( "close_iteration_test", "[serial]" )
 {
+#if openPMD_HAVE_ADIOS2
     close_iteration_test( "bp" );
+#endif
+    close_iteration_test( "json" );
 }
 
 inline void