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

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

import javax.lang.model.type.TypeMirror;

/**
 * A node for a reference to 'this', either implicit or explicit.
 *
 *  *   this
 * 
 */
public abstract class ThisNode extends Node {

    protected ThisNode(TypeMirror type) {
        super(type);
    }

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

    @Override
    public int hashCode() {
        return 3559101; // Objects.hash("this");
    }

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