Javaクラスを選択して実行したアクションでJavaクラス名をひろう

ICompilationUnit#findPrimaryType().getFullyQualifiedName()
でとれる。こんなの探して30分〜。プラグイン開発スキルがぜんぜん進歩してません。はい。

import org.eclipse.jdt.core.ICompilationUnit;

import org.eclipse.jdt.core.IJavaProject;

import org.eclipse.jface.action.IAction;

import org.eclipse.jface.viewers.ISelection;

import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.ui.IObjectActionDelegate;

import org.eclipse.ui.IWorkbenchPart;
public class LaunchAction implements IObjectActionDelegate{
    private ISelection selection;
    

    public void setActivePart(IAction action, IWorkbenchPart targetPart) {

    }
    public void run(IAction action) {

        System.out.println("run!");
        try {

            ICompilationUnit cu = (ICompilationUnit)((IStructuredSelection)selection).getFirstElement();

            String className = cu.findPrimaryType().getFullyQualifiedName()

            //...
        } catch (Exception e) {

            e.printStackTrace();

        }

    }
    public void selectionChanged(IAction action, ISelection selection) {

        this.selection = selection;

    }
}