FileAttributes.java

/*
blizzy's Backup - Easy to use personal file backup application
Copyright (C) 2011-2012 Maik Schreiber

This program 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 de.blizzy.backup;

import java.io.IOException;
import java.nio.file.FileSystemException;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.attribute.DosFileAttributeView;
import java.nio.file.attribute.DosFileAttributes;
import java.nio.file.attribute.FileTime;
import java.nio.file.attribute.PosixFileAttributeView;
import java.nio.file.attribute.PosixFileAttributes;

public class FileAttributes {
	private static enum OS {
		DOS, POSIX;
	}
	
	private static OS os;
	
	private Path path;
	private DosFileAttributeView dosView;
	private DosFileAttributes dosAttrs;
	private PosixFileAttributeView posixView;
	private PosixFileAttributes posixAttrs;

	private FileAttributes(Path path, DosFileAttributeView dosView, DosFileAttributes dosAttrs,
			PosixFileAttributeView posixView, PosixFileAttributes posixAttrs) {

		if ((posixView != null) && (posixAttrs != null)) {
			dosView = null;
			dosAttrs = null;
		} else {
			posixView = null;
			posixAttrs = null;
		}

		this.path = path;
		this.dosView = dosView;
		this.dosAttrs = dosAttrs;
		this.posixView = posixView;
		this.posixAttrs = posixAttrs;
	}
	
	public static FileAttributes get(Path path) throws IOException {
		DosFileAttributeView dosView = null;
		DosFileAttributes dosAttrs = null;
		if ((os == OS.DOS) || (os == null)) {
			dosView = Files.getFileAttributeView(
					path, DosFileAttributeView.class, LinkOption.NOFOLLOW_LINKS);
			try {
				dosAttrs = Files.readAttributes(path, DosFileAttributes.class, LinkOption.NOFOLLOW_LINKS);
			} catch (UnsupportedOperationException e) {
				// ignore
			} catch (FileSystemException e) {
				// ignore
			}
		}
		
		PosixFileAttributeView posixView = null;
		PosixFileAttributes posixAttrs = null;
		if ((os == OS.POSIX) || (os == null)) {
			posixView = Files.getFileAttributeView(
					path, PosixFileAttributeView.class, LinkOption.NOFOLLOW_LINKS);
			try {
				posixAttrs = Files.readAttributes(path, PosixFileAttributes.class, LinkOption.NOFOLLOW_LINKS);
			} catch (UnsupportedOperationException e) {
				// ignore
			} catch (FileSystemException e) {
				// ignore
			}
		}
		
		if (os == null) {
			os = ((posixView != null) && (posixAttrs != null)) ? OS.POSIX : OS.DOS;
		}

		return new FileAttributes(path, dosView, dosAttrs, posixView, posixAttrs);
	}
	
	public boolean isHidden() {
		if (dosAttrs != null) {
			return dosAttrs.isHidden();
		}
		if (posixAttrs != null) {
			return path.getFileName().startsWith("."); //$NON-NLS-1$
		}
		return false;
	}
	
	public void setHidden(boolean hidden) throws IOException {
		if (dosView != null) {
			dosView.setHidden(hidden);
		}
	}
	
	public FileTime getCreationTime() {
		if (dosAttrs != null) {
			return dosAttrs.creationTime();
		}
		if (posixAttrs != null) {
			return posixAttrs.creationTime();
		}
		return null;
	}
	
	public FileTime getModificationTime() {
		if (dosAttrs != null) {
			return dosAttrs.lastModifiedTime();
		}
		if (posixAttrs != null) {
			return posixAttrs.lastModifiedTime();
		}
		return null;
	}
	
	public void setTimes(FileTime creationTime, FileTime modificationTime) throws IOException {
		if (dosView != null) {
			dosView.setTimes(modificationTime, null, creationTime);
		} else if (posixView != null) {
			posixView.setTimes(modificationTime, null, creationTime);
		}
	}
}