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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 org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.dataflow.qual.SideEffectFree;
import org.checkerframework.javacutil.TreeUtils;

import java.util.Collection;
import java.util.Collections;

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

    protected final IdentifierTree tree;

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

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

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

    @Override
    public String toString() {
        return "super";
    }

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

    @Override
    public int hashCode() {
        return 109801370; // Objects.hash("super");
    }

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