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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 java.util.Objects;
import javax.lang.model.type.TypeMirror;
import org.checkerframework.checker.nullness.qual.Nullable;

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

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

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

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

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

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