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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 this}. */
public class ThisReference extends JavaExpression {
  /**
   * Create a new ThisReference.
   *
   * @param type the type of the {@code this} reference
   */
  public ThisReference(TypeMirror type) {
    super(type);
  }

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

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

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

  @Override
  public boolean containsOfClass(Class clazz) {
    return getClass() == clazz;
  }

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

  @Override
  public boolean isUnassignableByOtherCode() {
    return true;
  }

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

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

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

  @Override
  public boolean containsModifiableAliasOf(Store store, JavaExpression other) {
    return false; // 'this' is not modifiable
  }

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