@Nullable
@Override
public PsiFileAndName toPsiFileAndName(BlazeProjectData projectData, ProjectViewNode<?> node) {
  if (!(node instanceof ClassTreeNode)) {
    return null;
  }
  PsiClass psiClass = ((ClassTreeNode) node).getPsiClass();
  if (psiClass == null) {
    return null;
  }
  PsiFile file = psiClass.getContainingFile();
  return file != null ? new PsiFileAndName(file, psiClass.getName()) : null;
}
 

@Nullable
@Override
public PsiFileAndName toPsiFileAndName(BlazeProjectData projectData, ProjectViewNode<?> node) {
  if (!(node instanceof ClassTreeNode)) {
    return null;
  }
  PsiClass psiClass = ((ClassTreeNode) node).getPsiClass();
  if (psiClass == null) {
    return null;
  }
  PsiFile file = psiClass.getContainingFile();
  return file != null ? new PsiFileAndName(file, psiClass.getName()) : null;
}
 

@Override
@Nullable
protected PsiClass getSelectedFromTreeUserObject(DefaultMutableTreeNode node) {
  Object userObject = node.getUserObject();
  if (!(userObject instanceof ClassTreeNode)) return null;
  ClassTreeNode descriptor = (ClassTreeNode)userObject;
  return descriptor.getPsiClass();
}
 

@Override
public boolean isForMe(ProjectViewNode node) {
    if (node instanceof ClassTreeNode) {
        ClassTreeNode classNode = (ClassTreeNode) node;
        if (classNode.isTopLevel()) {
            return true;
        }
    }
    return false;
}
 

@Override
protected VirtualFile getVirtualFile(ProjectViewNode node) {
    ClassTreeNode classNode = (ClassTreeNode) node;
    return PsiUtilBase.getVirtualFile(classNode.getPsiClass());
}