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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: F 《 A or A 》 F
 *
 * @see org.checkerframework.framework.util.typeinference.constraint.AFConstraint
 */
public class F2A extends AFConstraint {

  /** Create a constraint with an argument greater than a formal. */
  public F2A(AnnotatedTypeMirror formalParameter, AnnotatedTypeMirror argument) {
    super(argument, formalParameter);
  }

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

  @Override
  protected F2A construct(AnnotatedTypeMirror newArgument, AnnotatedTypeMirror newFormalParameter) {
    return new F2A(newFormalParameter, newArgument);
  }

  @Override
  public String toString() {
    return "F2A( " + formalParameter + " << " + argument + " )";
  }
}