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 + " )";
  }
}