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     */
018    package org.apache.hadoop.fs;
019    
020    import java.net.URI;
021    
022    import org.apache.hadoop.classification.InterfaceAudience;
023    import org.apache.hadoop.classification.InterfaceStability;
024    
025    /**
026     * FileSystem related constants.
027     */
028    @InterfaceAudience.Public
029    @InterfaceStability.Stable
030    public 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    }