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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;

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

    public F2A(AnnotatedTypeMirror formalParameter, AnnotatedTypeMirror argument) {
        super(argument, formalParameter, 37);
    }

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

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

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