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FileSystemAbstraction.java
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FileSystemAbstraction.java
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/*
* Copyright (c) 2002-2017 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.io.fs;
import java.io.Closeable;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.nio.charset.Charset;
import java.nio.file.CopyOption;
import java.nio.file.NoSuchFileException;
import java.util.function.Function;
import java.util.stream.Stream;
import java.util.zip.ZipOutputStream;
import org.neo4j.io.fs.watcher.FileWatcher;
public interface FileSystemAbstraction extends Closeable
{
/**
* Create file watcher that provides possibilities to monitor directories on underlying file system
* abstraction
*
* @return specific file system abstract watcher
* @throws IOException in case exception occur during file watcher creation
*/
FileWatcher fileWatcher() throws IOException;
StoreChannel open( File fileName, String mode ) throws IOException;
OutputStream openAsOutputStream( File fileName, boolean append ) throws IOException;
InputStream openAsInputStream( File fileName ) throws IOException;
Reader openAsReader( File fileName, Charset charset ) throws IOException;
Writer openAsWriter( File fileName, Charset charset, boolean append ) throws IOException;
StoreChannel create( File fileName ) throws IOException;
boolean fileExists( File fileName );
boolean mkdir( File fileName );
void mkdirs( File fileName ) throws IOException;
long getFileSize( File fileName );
boolean deleteFile( File fileName );
void deleteRecursively( File directory ) throws IOException;
void renameFile( File from, File to, CopyOption... copyOptions ) throws IOException;
File[] listFiles( File directory );
File[] listFiles( File directory, FilenameFilter filter );
boolean isDirectory( File file );
void moveToDirectory( File file, File toDirectory ) throws IOException;
void copyFile( File from, File to ) throws IOException;
void copyRecursively( File fromDirectory, File toDirectory ) throws IOException;
<K extends ThirdPartyFileSystem> K getOrCreateThirdPartyFileSystem( Class<K> clazz, Function<Class<K>,K> creator );
void truncate( File path, long size ) throws IOException;
long lastModifiedTime( File file ) throws IOException;
void deleteFileOrThrow( File file ) throws IOException;
interface ThirdPartyFileSystem extends Closeable
{
void close();
void dumpToZip( ZipOutputStream zip, byte[] scratchPad ) throws IOException;
}
/**
* Return a stream of {@link FileHandle file handles} for every file in the given directory, and its
* sub-directories.
* <p>
* Alternatively, if the {@link File} given as an argument refers to a file instead of a directory, then a stream
* will be returned with a file handle for just that file.
* <p>
* The stream is based on a snapshot of the file tree, so changes made to the tree using the returned file handles
* will not be reflected in the stream.
* <p>
* No directories will be returned. Only files. If a file handle ends up leaving a directory empty through a
* rename or a delete, then the empty directory will automatically be deleted as well.
* Likewise, if a file is moved to a path where not all of the directories in the path exists, then those missing
* directories will be created prior to the file rename.
*
* @param directory The base directory to start streaming files from, or the specific individual file to stream.
* @return A stream of all files in the tree.
* @throws NoSuchFileException If the given base directory or file does not exists.
* @throws IOException If an I/O error occurs, possibly with the canonicalisation of the paths.
*/
Stream<FileHandle> streamFilesRecursive( File directory ) throws IOException;
}