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/*
* This file is part of *** M y C o R e ***
* See http://www.mycore.de/ for details.
*
* MyCoRe 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.
*
* MyCoRe 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 MyCoRe. If not, see .
*/
package org.mycore.datamodel.niofs.utils;
import java.io.IOException;
import java.nio.file.FileAlreadyExistsException;
import java.nio.file.FileSystemLoopException;
import java.nio.file.FileVisitResult;
import java.nio.file.FileVisitor;
import java.nio.file.Files;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileTime;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.mycore.common.MCRSession;
import org.mycore.common.MCRSessionMgr;
/**
* Simple {@link FileVisitor} that recursive copies a directory
* @author Thomas Scheffler (yagee)
*
*/
public class MCRTreeCopier implements FileVisitor {
private static final Logger LOGGER = LogManager.getLogger(MCRTreeCopier.class);
private final Path source;
private final Path target;
private final boolean renameExisting;
private final boolean restartTransaction;
public MCRTreeCopier(Path source, Path target) throws NoSuchFileException {
this(source, target, false, false);
}
public MCRTreeCopier(Path source, Path target, boolean renameOnExisting) throws NoSuchFileException {
this(source, target, renameOnExisting, false);
}
public MCRTreeCopier(Path source, Path target, boolean renameOnExisting, boolean restartTransaction)
throws NoSuchFileException {
this.renameExisting = renameOnExisting;
if (Files.notExists(target)) {
throw new NoSuchFileException(target.toString(), null, "Target directory does not exist.");
}
this.source = source;
this.target = target;
this.restartTransaction = restartTransaction;
}
@Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
Path newdir = target.resolve(toTargetFS(source.relativize(dir)));
try {
Files.copy(dir, newdir, StandardCopyOption.COPY_ATTRIBUTES);
} catch (FileAlreadyExistsException x) {
// (okay if directory already exists).
// ignore
} catch (IOException x) {
LOGGER.error("Unable to create: {}", newdir, x);
return FileVisitResult.SKIP_SUBTREE;
}
return FileVisitResult.CONTINUE;
}
private void copyFile(Path source, Path target) {
try {
if (renameExisting && Files.exists(target)) {
int nameTry = 1;
String fileName = target.getFileName().toString();
int numberPosition = fileName.lastIndexOf(".") == -1 ? fileName.length() : fileName.lastIndexOf(".");
String prefixString = fileName.substring(0, numberPosition);
String suffixString = fileName.substring(numberPosition);
String newName = null;
Path parent = target.getParent();
do {
newName = prefixString + nameTry++ + suffixString;
target = parent.resolve(newName);
} while (Files.exists(target));
}
if (restartTransaction && MCRSessionMgr.hasCurrentSession()) {
final MCRSession currentSession = MCRSessionMgr.getCurrentSession();
currentSession.commitTransaction();
currentSession.beginTransaction();
}
Files.copy(source, target, StandardCopyOption.COPY_ATTRIBUTES, StandardCopyOption.REPLACE_EXISTING);
} catch (IOException x) {
LOGGER.error("Unable to copy: {}", source, x);
}
}
private Path toTargetFS(Path source) {
if (target.getFileSystem().equals(source.getFileSystem())) {
return source;
}
String[] nameParts = new String[source.getNameCount() - 1];
for (int i = 0; i < nameParts.length; i++) {
nameParts[i] = source.getName(i + 1).toString();
}
return target.getFileSystem().getPath(source.getName(0).toString(), nameParts);
}
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) {
// fix up modification time of directory when done
if (exc == null) {
Path newdir = target.resolve(toTargetFS(source.relativize(dir)));
try {
FileTime time = Files.getLastModifiedTime(dir);
Files.setLastModifiedTime(newdir, time);
} catch (IOException x) {
LOGGER.error("Unable to copy all attributes to: {}", newdir, x);
}
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
copyFile(file, target.resolve(toTargetFS(source.relativize(file))));
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFileFailed(Path file, IOException exc) {
if (exc instanceof FileSystemLoopException) {
LOGGER.error("cycle detected: {}", file);
} else {
LOGGER.error("Unable to copy: {}", file, exc);
}
return FileVisitResult.CONTINUE;
}
}