Language switcher for articles

Is there any way to make a language switcher for only single post? For example if there is a french version of some article, the language switcher for french displays.
I’ve got sth like this (it’s necessary to add some more if):

<?php $lang_link = str_replace(home_url(), '', get_permalink()); ?>
							  <?php if ( $curr_lang == "en" ){ ?>
								<a href="<?php echo site_url(); ?>/fr<?php echo $lang_link; ?>">fr</a>
								<a href="<?php echo site_url(); ?>/de<?php echo $lang_link; ?>">de</a>
								<?php } else if ( qtrans_getLanguage() == "fr" ) { ?>
								<a href="<?php echo site_url(); ?>/en<?php echo $lang_link; ?>">en</a>
								<a href="<?php echo site_url(); ?>/de<?php echo $lang_link; ?>">de</a>
								<?php } else { ?>
								<a href="<?php echo site_url(); ?>/en<?php echo $lang_link; ?>">en</a>
								<a href="<?php echo site_url(); ?>/fr<?php echo $lang_link; ?>">fr</a>
								<?php } ?>