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Apache Commons VFS is a Virtual File System library.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.vfs2;
/**
* Represents a file name. File names are immutable, and work correctly as keys in hash tables.
*
* @see FileObject
*/
public interface FileName extends Comparable {
/**
* The separator character used in file paths.
*/
char SEPARATOR_CHAR = '/';
/**
* The separator used in file paths.
*/
String SEPARATOR = "/";
/**
* The absolute path of the root of a file system.
*/
String ROOT_PATH = "/";
/**
* Returns the base name of this file. The base name is the last element of the file name. For example the base name
* of {@code /somefolder/somefile} is {@code somefile}.
*
* The root file of a file system has an empty base name.
*
*
* @return The base name. Never returns null.
*/
String getBaseName();
/**
* Returns the absolute path of this file, within its file system. This path is normalized, so that {@code .} and
* {@code ..} elements have been removed. Also, the path only contains {@code /} as its separator character. The
* path always starts with {@code /}
*
* The root of a file system has {@code /} as its absolute path.
*
*
* @return The path. Never returns null.
*/
String getPath();
/**
* Returns the absolute path of this file, within its file system. This path is normalized, so that {@code .} and
* {@code ..} elements have been removed. Also, the path only contains {@code /} as its separator character. The
* path always starts with {@code /}
*
* The root of a file system has {@code /} as its absolute path.
*
*
* In contrast to {@link #getPath()} the path is decoded i.e. all %nn stuff replaced by its character.
*
*
* @return The path. Never returns null.
* @throws FileSystemException if the path is not correctly encoded
*/
String getPathDecoded() throws FileSystemException;
/**
* Returns the extension of this file name.
*
* @return The extension. Returns an empty string if the name has no extension.
*/
String getExtension();
/**
* Returns the depth of this file name, within its file system. The depth of the root of a file system is 0. The
* depth of any other file is 1 + the depth of its parent.
*
* @return The depth of this file name.
*/
int getDepth();
/**
* Returns the URI scheme of this file.
*
* @return The URI scheme of this file.
*/
String getScheme();
/**
* Returns the absolute URI of this file.
*
* @return the absolute URI of this file.
*/
String getURI();
/**
* Returns the root URI of the file system this file belongs to.
*
* @return the root URI.
*/
String getRootURI();
/**
* Finds the root of the file system.
*
* @return the file system root.
*/
FileName getRoot();
/**
* Returns the file name of the parent of this file. The root of a file system has no parent.
*
* @return A {@link FileName} object representing the parent name. Returns null for the root of a file system.
*/
FileName getParent();
/**
* Converts a file name to a relative name, relative to this file name.
*
* @param name The name to convert to a relative path.
* @return The relative name.
* @throws FileSystemException On error.
*/
String getRelativeName(FileName name) throws FileSystemException;
/**
* Determines if another file name is an ancestor of this file name.
*
* @param ancestor The FileName to check.
* @return true if another file name is an ancestor of this file name.
*/
boolean isAncestor(FileName ancestor);
/**
* Determines if another file name is a descendent of this file name.
*
* @param descendent the FileName to check.
* @return true if the other FileName is a descendent of this file name.
*/
boolean isDescendent(FileName descendent);
/**
* Determines if another file name is a descendent of this file name.
*
* @param descendent the FileName to check.
* @param nameScope the NameScope of the FileName.
* @return true if the other FileName is a descendent of this file name.
*/
boolean isDescendent(FileName descendent, NameScope nameScope);
/**
* Checks if this file name is a name for a regular file.
*
* @return true if this file name is a name for a regular file.
* @throws FileSystemException if an error occurs.
* @see #getType()
* @see FileType#FILE
* @since 2.1
*/
boolean isFile() throws FileSystemException;
/**
* Returns the requested or current type of this name.
*
* The "requested" type is the one determined during resolving the name. In this case the name is a
* {@link FileType#FOLDER} if it ends with an "/" else it will be a {@link FileType#FILE}.
*
*
* Once attached it will be changed to reflect the real type of this resource.
*
*
* @return {@link FileType#FOLDER} or {@link FileType#FILE}
*/
FileType getType();
/**
* Returns a "friendly path", this is a path without a password.
*
* This path can not be used to resolve the path again.
*
*
* @return the friendly URI as a String.
*/
String getFriendlyURI();
}