content: /*
   * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * 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.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package java.nio.file;
  
  import java.nio.file.attribute.BasicFileAttributes;
  import java.io.IOException;
  import java.util.Objects;
  
  /**
   * A simple visitor of files with default behavior to visit all files and to
   * re-throw I/O errors.
   *
   * <p> Methods in this class may be overridden subject to their general contract.
   *
   * @param   <T>     The type of reference to the files
   *
   * @since 1.7
   */
  
  public class SimpleFileVisitor<T> implements FileVisitor<T> {
      /**
       * Initializes a new instance of this class.
       */
      protected SimpleFileVisitor() {
      }
  
      /**
       * Invoked for a directory before entries in the directory are visited.
       *
       * <p> Unless overridden, this method returns {@link FileVisitResult#CONTINUE
       * CONTINUE}.
       */
      @Override
      public FileVisitResult preVisitDirectory(T dir, BasicFileAttributes attrs)
          throws IOException
      {
          Objects.requireNonNull(dir);
          Objects.requireNonNull(attrs);
          return FileVisitResult.CONTINUE;
      }
  
      /**
       * Invoked for a file in a directory.
       *
       * <p> Unless overridden, this method returns {@link FileVisitResult#CONTINUE
       * CONTINUE}.
       */
      @Override
      public FileVisitResult visitFile(T file, BasicFileAttributes attrs)
          throws IOException
      {
          Objects.requireNonNull(file);
          Objects.requireNonNull(attrs);
          return FileVisitResult.CONTINUE;
      }
  
      /**
       * Invoked for a file that could not be visited.
       *
       * <p> Unless overridden, this method re-throws the I/O exception that prevented
       * the file from being visited.
       */
      @Override
      public FileVisitResult visitFileFailed(T file, IOException exc)
          throws IOException
      {
          Objects.requireNonNull(file);
          throw exc;
      }
  
      /**
       * Invoked for a directory after entries in the directory, and all of their
       * descendants, have been visited.
       *
       * <p> Unless overridden, this method returns {@link FileVisitResult#CONTINUE
       * CONTINUE} if the directory iteration completes without an I/O exception;
       * otherwise this method re-throws the I/O exception that caused the iteration
       * of the directory to terminate prematurely.
       */
      @Override
      public FileVisitResult postVisitDirectory(T dir, IOException exc)
          throws IOException
      {
          Objects.requireNonNull(dir);
          if (exc != null)
              throw exc;
          return FileVisitResult.CONTINUE;
      }
  }
  