001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.fs;
019
020import java.net.URI;
021
022import org.apache.hadoop.classification.InterfaceAudience;
023import org.apache.hadoop.classification.InterfaceStability;
024
025/**
026 * FileSystem related constants.
027 */
028@InterfaceAudience.Public
029@InterfaceStability.Stable
030public interface FsConstants {
031  // URI for local filesystem
032  public static final URI LOCAL_FS_URI = URI.create("file:///");
033  
034  // URI scheme for FTP
035  public static final String FTP_SCHEME = "ftp";
036
037  // Maximum number of symlinks to recursively resolve in a path
038  static final int MAX_PATH_LINKS = 32;
039
040  /**
041   * ViewFs: viewFs file system (ie the mount file system on client side)
042   */
043  public static final URI VIEWFS_URI = URI.create("viewfs:///");
044  public static final String VIEWFS_SCHEME = "viewfs";
045}