question: private void loadMap ( String extension , String mimeType ) { if ( ! mimeTypeToExtensionMap . containsKey ( mimeType ) ) { mimeTypeToExtensionMap . put ( mimeType , extension ) ; } extensionToMimeTypeMap . put ( extension , mimeType ) ; if ( isImageType ( mimeType ) ) { imageMimeTypeSet . add ( mimeType ) ; } }
target:  Load an entry into the map.