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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.type.typeannotator;

import org.checkerframework.framework.type.AnnotatedTypeFactory;
import org.checkerframework.framework.type.AnnotatedTypeMirror.AnnotatedExecutableType;
import org.checkerframework.framework.type.visitor.AnnotatedTypeScanner;


/**
 * {@link TypeAnnotator} is an abstract AnnotatedTypeScanner to be
 * used with {@link ListTypeAnnotator}
 *
 * @see org.checkerframework.framework.type.typeannotator.ListTypeAnnotator
 * @see org.checkerframework.framework.type.typeannotator.PropagationTypeAnnotator
 * @see org.checkerframework.framework.type.typeannotator.ImplicitsTypeAnnotator
 */
public abstract class TypeAnnotator extends AnnotatedTypeScanner {

    protected final AnnotatedTypeFactory typeFactory;

    public TypeAnnotator(AnnotatedTypeFactory typeFactory) {
        this.typeFactory = typeFactory;
    }

    @Override
    public Void visitExecutable(AnnotatedExecutableType t, Void p) {
        // skip the receiver
        scan(t.getReturnType(), p);
        scanAndReduce(t.getParameterTypes(), p, null);
        scanAndReduce(t.getThrownTypes(), p, null);
        scanAndReduce(t.getTypeVariables(), p, null);
        return null;
    }
}