/*
* This file is part of Skript.
*
* Skript 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.
*
* Skript 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 Skript. If not, see <http://www.gnu.org/licenses/>.
*
*
* Copyright 2011-2014 Peter Güttinger
*
*/
package ch.njol.skript.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import ch.njol.skript.classes.Converter;
/**
* @author Peter Güttinger
*/
public abstract class FileUtils {
private static boolean RUNNINGJAVA6 = true;// = System.getProperty("java.version").startsWith("1.6"); // doesn't work reliably?
static {
try {
new File(".").toPath();
RUNNINGJAVA6 = false;
} catch (final NoSuchMethodError e) {
RUNNINGJAVA6 = true;
} catch (final Exception e) {
RUNNINGJAVA6 = false;
}
}
private FileUtils() {}
private final static SimpleDateFormat backupFormat = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss");
/**
* @return The current date and time
*/
public final static String getBackupSuffix() {
synchronized (backupFormat) {
return "" + backupFormat.format(System.currentTimeMillis());
}
}
public final static File backup(final File f) throws IOException {
String name = f.getName();
final int c = name.lastIndexOf('.');
final String ext = c == -1 ? null : name.substring(c + 1);
if (c != -1)
name = name.substring(0, c);
final File backupFolder = new File(f.getParentFile(), "backups" + File.separator);
if (!backupFolder.exists() && !backupFolder.mkdirs())
throw new IOException("Cannot create backups folder");
final File backup = new File(backupFolder, name + "_" + getBackupSuffix() + (ext == null ? "" : "." + ext));
if (backup.exists())
throw new IOException("Backup file " + backup.getName() + " does already exist");
copy(f, backup);
return backup;
}
public final static File move(final File from, final File to, final boolean replace) throws IOException {
if (!replace && to.exists())
throw new IOException("Can't rename " + from.getName() + " to " + to.getName() + ": The target file already exists");
if (!RUNNINGJAVA6) {
if (replace)
Files.move(from.toPath(), to.toPath(), StandardCopyOption.REPLACE_EXISTING, StandardCopyOption.ATOMIC_MOVE);
else
Files.move(from.toPath(), to.toPath(), StandardCopyOption.ATOMIC_MOVE);
} else {
File moveTo = null;
if (replace && to.exists()) {
moveTo = new File(to.getAbsolutePath() + ".old0");
int i = 0;
while (moveTo.exists() && i < 1000)
moveTo = new File(to.getAbsolutePath() + ".old" + (++i));
if (i == 999 || !to.renameTo(moveTo))
throw new IOException("Can't rename " + from.getName() + " to " + to.getName() + ": Cannot temporarily rename the target file");
}
if (!from.renameTo(to)) {
if (moveTo != null)
moveTo.renameTo(to);
throw new IOException("Can't rename " + from.getName() + " to " + to.getName());
}
if (moveTo != null)
moveTo.delete();
}
return to;
}
public final static void copy(final File from, final File to) throws IOException {
if (!RUNNINGJAVA6) {
Files.copy(from.toPath(), to.toPath(), StandardCopyOption.COPY_ATTRIBUTES);
} else {
FileInputStream in = null;
FileOutputStream out = null;
try {
in = new FileInputStream(from);
out = new FileOutputStream(to);
final byte[] buffer = new byte[4096];
int bytesRead;
while ((bytesRead = in.read(buffer)) != -1)
out.write(buffer, 0, bytesRead);
} catch (final Exception e) {
throw new IOException("Can't copy " + from.getName() + " to " + to.getName() + ": " + e.getLocalizedMessage(), e);
} finally {
if (in != null) {
try {
in.close();
} catch (final IOException e) {}
}
if (out != null) {
try {
out.close();
} catch (final IOException e) {}
}
}
}
}
/**
* @param directory
* @param renamer Renames files. Return null to leave a file as-is.
* @return A collection of all changed files (with their new names)
* @throws IOException If renaming one of the files caused an IOException. Some files might have been renamed already.
*/
public final static Collection<File> renameAll(final File directory, final Converter<String, String> renamer) throws IOException {
final Collection<File> changed = new ArrayList<File>();
for (final File f : directory.listFiles()) {
if (f.isDirectory()) {
changed.addAll(renameAll(f, renamer));
} else {
final String name = f.getName();
if (name == null)
continue;
final String newName = renamer.convert(name);
if (newName == null)
continue;
final File newFile = new File(f.getParent(), newName);
move(f, newFile, false);
changed.add(newFile);
}
}
return changed;
}
/**
* Saves the contents of an InputStream in a file.
*
* @param in The InputStream to read from. This stream will not be closed when this method returns.
* @param file The file to save to. Will be replaced if it exists, or created if it doesn't.
* @throws IOException
*/
public final static void save(final InputStream in, final File file) throws IOException {
file.getParentFile().mkdirs();
FileOutputStream out = null;
try {
out = new FileOutputStream(file);
final byte[] buffer = new byte[16 * 1024];
int read;
while ((read = in.read(buffer)) > 0) {
out.write(buffer, 0, read);
}
} finally {
if (out != null)
out.close();
}
}
}