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

import javax.lang.model.type.TypeMirror;

import org.checkerframework.dataflow.util.HashCodeUtils;

/**
 * A node for a reference to 'this', either implicit or explicit.
 *
 *  *   this
 * 
 *
 * @author Stefan Heule
 * @author Charlie Garrett
 *
 */
public abstract class ThisLiteralNode extends Node {

    public ThisLiteralNode(TypeMirror type) {
        super(type);
    }

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

    @Override
    public boolean equals(Object obj) {
        if (obj == null || !(obj instanceof ThisLiteralNode)) {
            return false;
        }
        return true;
    }

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

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