You see Ibia, pardon me for saying this, but it is misapprehensions such as this, that vindicates my notion, that the vast majority of people haven't a clue what they sign up for when they vote on European Treaties, nor the long terms effects of what they have signed up or.
It also vindicates my notion that Irish political parties never actually tell the truth to people because if they did, there is a good chance that people wouldn't vote the way that political parties want them to vote.
European Law does supercede Irish law, all the way up to and including the interpretations of the Irish Supreme Court.
Here is the competency of the European Court of Justice
The European Court of Justice (officially the Court of Justice), is the highest court in the European Union in matters of European Union law. As a part of the Court of Justice of the European Union it is tasked with interpreting EU law and ensuring its equal application across all EU member states. (My bold)
European Court of Justice - Wikipedia, the free encyclopedia
and here is the effect of European Law
"One of the most important aspects of the European Union is that its legislation is superior to all national legislation.
This means that European law is supreme. Nothing in the Constitution of Ireland or any of our national laws can override or take precedence over an EU law. " (my bold again)
European Laws-Information from CitizensInformation.ie
That second passage does not come from some Europhobe conspiracy theory website, it is copied directly from the link which is the Government run and funded, Citizens Information website.
So, to answer your point, if European Law supercedes Irish Law (which it does), and the ECJ is the final intrepreter and arbiter of European Law, then ergo, the ECJ does interpret national constitutions
You can now take a case in Irish law all the way to the Supreme Court, and if you lose, then go beyond it to the ECJ, and the final ruling of the ECJ will be the deciding factor, bot the Supreme Court