31  * A simple visitor for tree nodes.

    31  * A simple visitor for tree nodes.

    32  *

    32  *

    33  * @author Peter von der Ahé

    33  * @author Peter von der Ahé

    34  * @since 1.6

    34  * @since 1.6

    35  */

    35  */

    37 public class SimpleTreeVisitor <R,P> implements TreeVisitor<R,P> {

    37 public class SimpleTreeVisitor <R,P> implements TreeVisitor<R,P> {

    38     protected final R DEFAULT_VALUE;

    38     protected final R DEFAULT_VALUE;

    39 

    39 

    40     protected SimpleTreeVisitor() {

    40     protected SimpleTreeVisitor() {

    41         DEFAULT_VALUE = null;

    41         DEFAULT_VALUE = null;