Created
August 13, 2013 00:44
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directory copier
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| import java.io.*; | |
| /* | |
| * Your assignment: This class will copy all the files in one directory to another directories | |
| * in series (not in parallel). You are to modify this to copy multiple files in parallel using threads. | |
| */ | |
| public class DirectoryCopier { | |
| private static final int BUFFER_SIZE = 1024; | |
| /** | |
| * Copies one directory to another directory | |
| * Only works with existing directories, and only copies the first level of files | |
| * TODO: This does not currently recursively copy files. Change it to do so. | |
| * | |
| * @param sourceDir The source directory file. Must be an existing directory. | |
| * @param destinationDir The destination directory file. Must be an existing directory. | |
| * @throws IOException An IOException raised while copying the files. | |
| */ | |
| public void copyDirectory(File sourceDir, File destinationDir) throws IOException { | |
| if (!sourceDir.isDirectory() && !destinationDir.isDirectory()) { | |
| throw new IllegalArgumentException("Must pass directories into copyDirectory function"); | |
| } | |
| if (sourceDir.isDirectory() && !destinationDir.exists()) destinationDir.mkdirs(); | |
| FileFilter fileFilter = new FileFilter() { | |
| public boolean accept(File file) { | |
| return file.isFile(); | |
| } | |
| }; | |
| File[] filesToCopy = sourceDir.listFiles(fileFilter); | |
| for (File sourceFile : filesToCopy) { | |
| File destinationFile = new File(destinationDir, sourceFile.getName()); | |
| copyFile(sourceFile, destinationFile); | |
| } | |
| FileFilter directoryFilter = new FileFilter() { | |
| public boolean accept(File directory) { | |
| return directory.isDirectory(); | |
| } | |
| }; | |
| File[] directories = sourceDir.listFiles(directoryFilter); | |
| // if (directories.length == 0) | |
| for (File directory : directories) { | |
| File destinationDirectory = new File (destinationDir, directory.getName()); | |
| copyDirectory(directory, destinationDirectory); | |
| } | |
| } | |
| /** | |
| * Copies a file from one place to another. | |
| * @param source Source file. Must be an actual file. | |
| * @param destination Destination file. | |
| * @throws IOException An exception raised while copying the file. | |
| */ | |
| private void copyFile(File source, File destination) throws IOException { | |
| if (!source.isFile()) | |
| throw new IllegalArgumentException("Input file must be an actual file!"); | |
| if (!destination.exists()) | |
| destination.createNewFile(); | |
| InputStream in = null; | |
| OutputStream out = null; | |
| try { | |
| in = new FileInputStream(source); | |
| out = new FileOutputStream(destination); | |
| byte[] buf = new byte[BUFFER_SIZE]; | |
| int len; | |
| while ((len = in.read(buf)) > 0) { | |
| out.write(buf, 0, len); | |
| } | |
| } | |
| finally { | |
| if (in != null) | |
| in.close(); | |
| if (out != null) | |
| out.close(); | |
| } | |
| } | |
| } |
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