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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 javax.lang.model.element.Element;
import org.checkerframework.framework.type.AnnotatedTypeFactory;
import org.checkerframework.framework.type.AnnotatedTypeMirror;
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 DefaultForTypeAnnotator
 */
public abstract class TypeAnnotator extends AnnotatedTypeScanner {

  protected final AnnotatedTypeFactory typeFactory;

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

  /**
   * {@inheritDoc}
   *
   * If this method adds annotations to the type of method parameters, then {@link
   * org.checkerframework.framework.type.GenericAnnotatedTypeFactory#addComputedTypeAnnotations(Element,
   * AnnotatedTypeMirror)} should be overriden and the same annotations added to the type of
   * elements with kind {@link javax.lang.model.element.ElementKind#PARAMETER}. Likewise for return
   * types.
   */
  @Override
  public Void visitExecutable(AnnotatedExecutableType method, Void aVoid) {
    return super.visitExecutable(method, aVoid);
  }
}