Custom Sonarqube Rule Construction

Question

hello!

I am creating a plugin in Sonarqube with custom Rules and as my first Rule, I want to do a validation in If declarations where an alarm is triggered every time a literal String enters as parameter.

I am following the example structure that is in software documentation, but I cannot find any documentation on possible alternatives in the construction of Rules.

To test, I’m using a code from an Android DIVA screen:

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class HardcodeActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_hardcode);
    }

    public void access(View view) {
        EditText hckey = (EditText) findViewById(R.id.hcKey);

        if (hckey.getText().toString().equals("vendorsecretkey")) { // Noncompliant
            Toast.makeText(this, "Access granted! See you on the other side :)", Toast.LENGTH_SHORT).show();
        }
        else {
            Toast.makeText(this, "Access denied! See you in hell :D", Toast.LENGTH_SHORT).show();
        }
    }
}

Having said that, the comparison is being made by my Rule in the following excerpt:

    @Override
  public void visitNode(Tree tree){
    IfStatementTree ifStatement = (IfStatementTree) tree;
    ifStatement.condition().kind();
    if (ifStatement.condition().kind() == (Kind.STRING_LITERAL)){
        reportIssue(ifStatement.ifKeyword(), "Comparação if sendo feita com string literal!");
    }
  }

The problem is occurring due to the factors being used to compare the rule, but I can’t find any method or attribute that can help me in this comparison (I also couldn’t find any documentation explaining more about Ifstatementtree, the most I could find was that).

Could someone please help me with this issue or point me to some content that has more information?

Thank you for your attention!