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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.dataflow.cfg.node;

import com.sun.source.tree.IdentifierTree;
import com.sun.source.tree.Tree;
import java.util.Collection;
import java.util.Collections;
import java.util.Objects;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.javacutil.TreeUtils;

/**
 * A node for a reference to 'super'.
 *
 *  *   super
 * 
 */
public class SuperNode extends Node {

  protected final Tree tree;

  public SuperNode(Tree t) {
    super(TreeUtils.typeOf(t));
    assert t instanceof IdentifierTree && ((IdentifierTree) t).getName().contentEquals("super");
    tree = t;
  }

  @Override
  public Tree getTree() {
    return tree;
  }

  @Override
  public  R accept(NodeVisitor visitor, P p) {
    return visitor.visitSuper(this, p);
  }

  public String getName() {
    return "super";
  }

  @Override
  public String toString() {
    return getName();
  }

  @Override
  public boolean equals(@Nullable Object obj) {
    return obj instanceof SuperNode;
  }

  @Override
  public int hashCode() {
    return Objects.hash(getName());
  }

  @Override
  public Collection getOperands() {
    return Collections.emptyList();
  }
}