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*
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* 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
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package javax.lang.model.util;
import javax.lang.model.element.*;
import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.SourceVersion;
import static javax.lang.model.SourceVersion.*;
/**
* A simple visitor of program elements with default behavior
* appropriate for the {@link SourceVersion#RELEASE_6 RELEASE_6}
* source version.
*
* Visit methods corresponding to {@code RELEASE_6} language
* constructs call {@link #defaultAction defaultAction}, passing their
* arguments to {@code defaultAction}'s corresponding parameters.
*
* For constructs introduced in {@code RELEASE_7} and later, {@code
* visitUnknown} is called instead.
*
* <p> Methods in this class may be overridden subject to their
* general contract. Note that annotating methods in concrete
* subclasses with {@link java.lang.Override @Override} will help
* ensure that methods are overridden as intended.
*
* <p> <b>WARNING:</b> The {@code ElementVisitor} interface
* implemented by this class may have methods added to it in the
* future to accommodate new, currently unknown, language structures
* added to future versions of the Java™ programming language.
* Therefore, methods whose names begin with {@code "visit"} may be
* added to this class in the future; to avoid incompatibilities,
* classes which extend this class should not declare any instance
* methods with names beginning with {@code "visit"}.
*
* <p>When such a new visit method is added, the default
* implementation in this class will be to call the {@link
* #visitUnknown visitUnknown} method. A new simple element visitor
* class will also be introduced to correspond to the new language
* level; this visitor will have different default behavior for the
* visit method in question. When the new visitor is introduced, all
* or portions of this visitor may be deprecated.
*
* @param <R> the return type of this visitor's methods. Use {@code Void}
* for visitors that do not need to return results.
* @param <P> the type of the additional parameter to this visitor's methods. Use {@code Void}
* for visitors that do not need an additional parameter.
*
* @author Joseph D. Darcy
* @author Scott Seligman
* @author Peter von der Ahé
*
* @see SimpleElementVisitor7
* @see SimpleElementVisitor8
* @see SimpleElementVisitor9
* @see SimpleElementVisitor14
* @since 1.6
*/
@SupportedSourceVersion(RELEASE_6)
public class SimpleElementVisitor6<R, P> extends AbstractElementVisitor6<R, P> {
/**
* Default value to be returned; {@link #defaultAction
* defaultAction} returns this value unless the method is
* overridden.
*/
protected final R DEFAULT_VALUE;
/**
* Constructor for concrete subclasses; uses {@code null} for the
* default value.
* @deprecated Release 6 is obsolete; update to a visitor for a newer
* release level.
*/
@Deprecated(since="9")
protected SimpleElementVisitor6(){
DEFAULT_VALUE = null;
}
/**
* Constructor for concrete subclasses; uses the argument for the
* default value.
*
* @param defaultValue the value to assign to {@link #DEFAULT_VALUE}
* @deprecated Release 6 is obsolete; update to a visitor for a newer
* release level.
*/
@Deprecated(since="9")
protected SimpleElementVisitor6(R defaultValue){
DEFAULT_VALUE = defaultValue;
}
/**
* The default action for visit methods.
*
* @implSpec The implementation in this class just returns {@link
* #DEFAULT_VALUE}; subclasses will commonly override this method.
*
* @param e the element to process
* @param p a visitor-specified parameter
* @return {@code DEFAULT_VALUE} unless overridden
*/
protected R defaultAction(Element e, P p) {
return DEFAULT_VALUE;
}
/**
* {@inheritDoc}
*
* @implSpec This implementation calls {@code defaultAction}.
*
* @param e {@inheritDoc}
* @param p {@inheritDoc}
* @return {@inheritDoc}
*/
public R visitPackage(PackageElement e, P p) {
return defaultAction(e, p);
}
/**
* {@inheritDoc}
*
* @implSpec This implementation calls {@code defaultAction}.
*
* @param e {@inheritDoc}
* @param p {@inheritDoc}
* @return {@inheritDoc}
*/
public R visitType(TypeElement e, P p) {
return defaultAction(e, p);
}
/**
* {@inheritDoc}
*
* @implSpec This implementation calls {@code defaultAction}, unless the
* element is a {@code RESOURCE_VARIABLE} in which case {@code
* visitUnknown} is called.
*
* @param e {@inheritDoc}
* @param p {@inheritDoc}
* @return {@inheritDoc}
*/
public R visitVariable(VariableElement e, P p) {
if (e.getKind() != ElementKind.RESOURCE_VARIABLE)
return defaultAction(e, p);
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