/* * * * Copyright 2016 Patrick Favre-Bulle * * * * 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. * */ package at.favre.tools.uberadb.util; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.math.BigInteger; import java.nio.file.FileVisitResult; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.SimpleFileVisitor; import java.nio.file.attribute.BasicFileAttributes; import java.security.MessageDigest; import java.text.DecimalFormat; import java.text.NumberFormat; import java.util.Locale; public final class FileUtil { private FileUtil() { } public static String getFileExtension(File file) { if (file == null) { return ""; } return file.getName().substring(file.getName().lastIndexOf(".") + 1); } public static String getFileNameWithoutExtension(File file) { String fileName = file.getName(); int pos = fileName.lastIndexOf("."); if (pos > 0) { fileName = fileName.substring(0, pos); } return fileName; } public static String createChecksum(File file, String shaAlgo) { try { InputStream fis = new FileInputStream(file); byte[] buffer = new byte[1024]; MessageDigest complete = MessageDigest.getInstance(shaAlgo); int numRead; do { numRead = fis.read(buffer); if (numRead > 0) { complete.update(buffer, 0, numRead); } } while (numRead != -1); fis.close(); return new BigInteger(1, complete.digest()).toString(16).toLowerCase(); } catch (Exception e) { throw new IllegalStateException("could not create checksum for " + file + " and algo " + shaAlgo + ": " + e.getMessage(), e); } } public static void removeRecursive(Path path) { try { Files.walkFileTree(path, new SimpleFileVisitor<Path>() { @Override public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException { Files.delete(file); return FileVisitResult.CONTINUE; } @Override public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException { Files.delete(file); return FileVisitResult.CONTINUE; } @Override public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException { if (exc == null) { Files.delete(dir); return FileVisitResult.CONTINUE; } else { throw exc; } } }); } catch (Exception e) { throw new IllegalStateException("could not delete " + path + ": " + e.getMessage(), e); } } public static String getFileSizeMb(File file) { try { DecimalFormat df = (DecimalFormat) NumberFormat.getNumberInstance(Locale.US); df.applyPattern("0.0#"); long fileSizeInBytes = file.length(); return df.format(fileSizeInBytes / (1024.0f * 1024.0f)) + " MiB"; } catch (Exception e) { return "<null>"; } } }