/
NioFiles.java
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/
NioFiles.java
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package org.codehaus.plexus.util;
/*
* Copyright 2007 The Codehaus Foundation.
*
* Licensed 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.
*/
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.PosixFilePermission;
import java.util.HashSet;
import java.util.Set;
/**
* Encapsulates use of java7 features, exposing mostly backward compatible types
*/
@SuppressWarnings( "Since15" )
public class NioFiles
{
public static boolean isSymbolicLink( File file )
{
return Files.isSymbolicLink( file.toPath() );
}
public static void chmod( File file, int mode )
throws IOException
{
Path path = file.toPath();
if ( !Files.isSymbolicLink( path ) )
{
Files.setPosixFilePermissions( path, getPermissions( mode ) );
}
}
@SuppressWarnings( { "OctalInteger", "MagicNumber" } )
private static Set<PosixFilePermission> getPermissions( int mode )
{
Set<PosixFilePermission> perms = new HashSet<PosixFilePermission>();
// add owners permission
if ( ( mode & 0400 ) > 0 )
{
perms.add( PosixFilePermission.OWNER_READ );
}
if ( ( mode & 0200 ) > 0 )
{
perms.add( PosixFilePermission.OWNER_WRITE );
}
if ( ( mode & 0100 ) > 0 )
{
perms.add( PosixFilePermission.OWNER_EXECUTE );
}
// add group permissions
if ( ( mode & 0040 ) > 0 )
{
perms.add( PosixFilePermission.GROUP_READ );
}
if ( ( mode & 0020 ) > 0 )
{
perms.add( PosixFilePermission.GROUP_WRITE );
}
if ( ( mode & 0010 ) > 0 )
{
perms.add( PosixFilePermission.GROUP_EXECUTE );
}
// add others permissions
if ( ( mode & 0004 ) > 0 )
{
perms.add( PosixFilePermission.OTHERS_READ );
}
if ( ( mode & 0002 ) > 0 )
{
perms.add( PosixFilePermission.OTHERS_WRITE );
}
if ( ( mode & 0001 ) > 0 )
{
perms.add( PosixFilePermission.OTHERS_EXECUTE );
}
return perms;
}
public static long getLastModified( File file )
throws IOException
{
BasicFileAttributes basicFileAttributes = Files.readAttributes( file.toPath(), BasicFileAttributes.class );
return basicFileAttributes.lastModifiedTime().toMillis();
}
/**
* Reads the target of the symbolic link
*
* @param symlink A file that is a symlink
* @return A file that is the target of the symlink
* @throws java.io.IOException
*/
public static File readSymbolicLink( File symlink )
throws IOException
{
Path path = Files.readSymbolicLink( symlink.toPath() );
return path.toFile();
}
public static File createSymbolicLink( File symlink, File target )
throws IOException
{
Path link = symlink.toPath();
if ( Files.exists( link, LinkOption.NOFOLLOW_LINKS ) )
{
Files.delete( link );
}
link = Files.createSymbolicLink( link, target.toPath() );
return link.toFile();
}
public static boolean deleteIfExists( File file )
throws IOException
{
return Files.deleteIfExists( file.toPath() );
}
public static File copy( File source, File target )
throws IOException
{
Path copy = Files.copy( source.toPath(), target.toPath(), StandardCopyOption.REPLACE_EXISTING,
StandardCopyOption.COPY_ATTRIBUTES );
return copy.toFile();
}
}