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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.expression;

import javax.lang.model.type.TypeMirror;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.dataflow.analysis.Store;
import org.checkerframework.javacutil.AnnotationProvider;
import org.checkerframework.javacutil.TypesUtils;

/** A use of {@code super}. */
public class SuperReference extends JavaExpression {

  /**
   * Creates a new {@link SuperReference}.
   *
   * @param type the type of the {@code super} reference
   */
  public SuperReference(TypeMirror type) {
    super(type);
  }

  @SuppressWarnings("unchecked") // generic cast
  @Override
  public  @Nullable T containedOfClass(Class clazz) {
    return getClass() == clazz ? (T) this : null;
  }

  @Override
  public boolean isDeterministic(AnnotationProvider provider) {
    return true;
  }

  @Override
  public boolean isAssignableByOtherCode() {
    return false;
  }

  @Override
  public boolean isModifiableByOtherCode() {
    return !TypesUtils.isImmutableTypeInJdk(type);
  }

  @Override
  public boolean containsModifiableAliasOf(Store store, JavaExpression other) {
    return false;
  }

  @Override
  public boolean syntacticEquals(JavaExpression je) {
    return je instanceof SuperReference;
  }

  @Override
  public boolean containsSyntacticEqualJavaExpression(JavaExpression other) {
    return this.syntacticEquals(other);
  }

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

  @Override
  public int hashCode() {
    return 0;
  }

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

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