final Traverser[] traversers = TraversalUtil.getTraversers("org.codelibs.core.io.xxx");
        assertThat(traversers, is(notNullValue()));
        assertThat(traversers.length, is(1));

        final Traverser traverser = traversers[0];
        assertThat(traverser instanceof FileSystemTraverser, is(true));

        assertThat(traverser.isExistClass("DummyTest"), is(true));

            traverseFileSystem(packageDir, rootPackage, handler);
        }
    }

    /**
     * Traverses classes contained in a Jar file.
     * <p>
     * If the specified Jar file has the extension <code>.war</code>, only entries whose path starts with the prefix <code>WEB-INF/classes</code> are traversed.

 * // won't work
 * TreeTraverser<NodeType> traverser = node -> node.getChildNodes();
 * }
 *
 * Instead, you can pass a lambda expression to the {@code using} factory method:
 *
 * {@snippet :
 * TreeTraverser<NodeType> traverser = TreeTraverser.using(node -> node.getChildNodes());
 * }
 *
 * @author Louis Wasserman
 * @since 15.0
 * @deprecated Use {@link com.google.common.graph.Traverser} instead. All instance methods have

 * // won't work
 * TreeTraverser<NodeType> traverser = node -> node.getChildNodes();
 * }
 *
 * Instead, you can pass a lambda expression to the {@code using} factory method:
 *
 * {@snippet :
 * TreeTraverser<NodeType> traverser = TreeTraverser.using(node -> node.getChildNodes());
 * }
 *
 * @author Louis Wasserman
 * @since 15.0
 * @deprecated Use {@link com.google.common.graph.Traverser} instead. All instance methods have

 */
package org.codelibs.core.io;

/**
 * Object representing a collection of classes or resources.
 *
 * @author koichik
 * @see TraversalUtil
 */
public interface Traverser {

    /**
     * Returns <code>true</code> if the class file corresponding to the specified class name exists in the resources handled by this instance.
     * <p>

        assertArgumentNotNull("handler", handler);

        forEach(rootDir, null, handler);
    }

    /**
     * Traverses resources contained in the file system.
     * <p>

    /**
     * The repository where this artifact has been downloaded from.
     */
    @Nonnull
    Optional<RemoteRepository> getRepository();

    /**
     * Traverses this node and potentially its children using the specified visitor.
     *
     * @param visitor the visitor to call back, must not be {@code null}

            throw new MetadataGraphTransformationException(e);
        }
    }

    // ===================================================================================================
    /**
     * Helper class to traverse graph. Required to make the containing method thread-safe
     * and yet use class level data to lessen stack usage in recursion
     */
    private class ClasspathGraphVisitor {
        MetadataGraph graph;

    }

    /**
     * Gets the artifact filter that controls traversal of the dependency graph.
     *
     * @return The filter used to determine which of the artifacts in the dependency graph should be traversed or
     *         {@code null} to collect all transitive dependencies.
     */
    public ArtifactFilter getCollectionFilter() {
        return collectionFilter;
    }

  echo "Error: Apache Maven 4.x requires Java 17 or newer to run." >&2
  "$JAVACMD" -version >&2
  echo "Please upgrade your Java installation or set JAVA_HOME to point to a compatible JDK." >&2
  exit 1
fi

# traverses directory structure from process work directory to filesystem root
# first directory with .mvn subdirectory is considered project base directory
find_maven_basedir() {
(
  basedir=`find_file_argument_basedir "$@"`