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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.framework.util.typeinference.constraint;

import org.checkerframework.framework.type.AnnotatedTypeMirror;
import org.checkerframework.framework.type.AnnotatedTypeMirror.AnnotatedTypeVariable;

/**
 * A constraint of the form: A 《 F or F 》 A
 *
 * @see org.checkerframework.framework.util.typeinference.constraint.AFConstraint
 */
public class A2F extends AFConstraint {

  /** Create a constraint with an argument less than a formal. */
  public A2F(AnnotatedTypeMirror argument, AnnotatedTypeMirror formalParameter) {
    super(argument, formalParameter);
  }

  @Override
  public TUConstraint toTUConstraint() {
    return new TSuperU((AnnotatedTypeVariable) formalParameter, argument, true);
  }

  @Override
  protected A2F construct(AnnotatedTypeMirror newArgument, AnnotatedTypeMirror newFormalParameter) {
    return new A2F(newArgument, newFormalParameter);
  }

  @Override
  public String toString() {
    return "A2F( " + argument + " << " + formalParameter + " )";
  }
}