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 * Copyright 2005-2006 Sun Microsystems, Inc.  All Rights Reserved.
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit if you need additional information or
 * have any questions.


import java.lang.annotation.Annotation;
import javax.annotation.processing.*;
import javax.lang.model.element.*;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.*;
import java.util.*;

 * Object providing state about a prior round of annotation processing.
 * <p><b>This is NOT part of any API supported by Sun Microsystems.
 * If you write code that depends on this, you do so at your own risk.
 * This code and its internal interfaces are subject to change or
 * deletion without notice.</b>
@Version("@(#)  1.13 07/05/05")
public class JavacRoundEnvironment implements RoundEnvironment {
    // Default equals and hashCode methods are okay.

    private final boolean processingOver;
    private final boolean errorRaised;
    private final ProcessingEnvironment processingEnv;

    // Caller must pass in an immutable set
    private final Set<? extends Element> rootElements;

    JavacRoundEnvironment(boolean processingOver,
        boolean errorRaised,
        Set<? extends Element> rootElements,
        ProcessingEnvironment processingEnv) {
  this.processingOver = processingOver;
  this.errorRaised = errorRaised;
  this.rootElements = rootElements;
        this.processingEnv = processingEnv;

    public String toString() {
  return String.format("[errorRaised=%b, rootElements=%s, processingOver=%b]",

    public boolean processingOver() {
  return processingOver;
     * Returns {@code true} if an error was raised in the prior round
     * of processing; returns {@code false} otherwise.
     * @return {@code true} if an error was raised in the prior round
     * of processing; returns {@code false} otherwise.
    public boolean errorRaised() {
  return errorRaised;

     * Returns the type elements specified by the prior round.
     * @return the types elements specified by the prior round, or an
     * empty set if there were none
    public Set<? extends Element> getRootElements() {
  return rootElements;

    private static final String NOT_AN_ANNOTATION_TYPE = 
  "The argument does not represent an annotation type: ";

     * Returns the elements annotated with the given annotation type.
     * Only type elements <i>included</i> in this round of annotation
     * processing, or declarations of members, parameters, or type
     * parameters declared within those, are returned.  Included type
     * elements are {@linkplain #getSpecifiedTypeElements specified
     * types} and any types nested within them.
     * @param a  annotation type being requested
     * @return the elements annotated with the given annotation type,
     * or an empty set if there are none
    public Set<? extends Element> getElementsAnnotatedWith(TypeElement a) {
  Set<Element> result = Collections.emptySet();
  if (a.getKind() != ElementKind.ANNOTATION_TYPE)
      throw new IllegalArgumentException(NOT_AN_ANNOTATION_TYPE + a);
  DeclaredType annotationTypeElement; 
  TypeMirror tm = a.asType();
  if ( tm instanceof DeclaredType )
      annotationTypeElement = (DeclaredType) a.asType();
      throw new AssertionError("Bad implementation type for " + tm);

  ElementScanner6<Set<Element>, DeclaredType> scanner = 
      new AnnotationSetScanner(result);
  for (Element element : rootElements)
      result = scanner.scan(element, annotationTypeElement);

  return result;

    // Could be written as a local class inside getElementsAnnotatedWith
    private class AnnotationSetScanner extends
  ElementScanner6<Set<Element>, DeclaredType> {
  // Insertion-order preserving set
  Set<Element> annotatedElements = new LinkedHashSet<Element>();

  AnnotationSetScanner(Set<Element> defaultSet) {

  public Set<Element> scan(Element e, DeclaredType p) {
      java.util.List<? extends AnnotationMirror> annotationMirrors = 
      for (AnnotationMirror annotationMirror : annotationMirrors) {
    if (annotationMirror.getAnnotationType().equals(p))
      e.accept(this, p);
      return annotatedElements;


     * {@inheritdoc}
    public Set<? extends Element> getElementsAnnotatedWith(Class<? extends Annotation> a) {
  if (!a.isAnnotation())
      throw new IllegalArgumentException(NOT_AN_ANNOTATION_TYPE + a);
  String name = a.getCanonicalName();
  if (name == null)
      return Collections.emptySet();
  else {
      TypeElement annotationType = processingEnv.getElementUtils().getTypeElement(name);
      if (annotationType == null)
    return Collections.emptySet();
    return getElementsAnnotatedWith(annotationType);
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