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/*
This file is part of Subsonic.
Subsonic 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.
Subsonic 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 Subsonic. If not, see <http://www.gnu.org/licenses/>.
Copyright 2009 (C) Sindre Mehus
*/
package net.sourceforge.subsonic.util;
import java.io.Closeable;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.util.Arrays;
import net.sourceforge.subsonic.Logger;
/**
* Miscellaneous file utility methods.
*
* @author Sindre Mehus
*/
public final class FileUtil {
private static final Logger LOG = Logger.getLogger(FileUtil.class);
/**
* Disallow external instantiation.
*/
private FileUtil() {
}
public static boolean isFile(final File file) {
return timed(new FileTask<Boolean>("isFile", file) {
@Override
public Boolean execute() {
return file.isFile();
}
});
}
public static boolean isDirectory(final File file) {
return timed(new FileTask<Boolean>("isDirectory", file) {
@Override
public Boolean execute() {
return file.isDirectory();
}
});
}
public static boolean exists(final File file) {
return timed(new FileTask<Boolean>("exists", file) {
@Override
public Boolean execute() {
return file.exists();
}
});
}
public static long lastModified(final File file) {
return timed(new FileTask<Long>("lastModified", file) {
@Override
public Long execute() {
return file.lastModified();
}
});
}
public static long length(final File file) {
return timed(new FileTask<Long>("length", file) {
@Override
public Long execute() {
return file.length();
}
});
}
/**
* Similar to {@link File#listFiles()}, but never returns null.
* Instead a warning is logged, and an empty array is returned.
*/
public static File[] listFiles(final File dir) {
File[] files = timed(new FileTask<File[]>("listFiles", dir) {
@Override
public File[] execute() {
return dir.listFiles();
}
});
if (files == null) {
LOG.warn("Failed to list children for " + dir.getPath());
return new File[0];
}
return files;
}
/**
* Similar to {@link File#listFiles(FilenameFilter)}, but never returns null.
* Instead a warning is logged, and an empty array is returned.
*/
public static File[] listFiles(final File dir, final FilenameFilter filter, boolean sort) {
File[] files = timed(new FileTask<File[]>("listFiles2", dir) {
@Override
public File[] execute() {
return dir.listFiles(filter);
}
});
if (files == null) {
LOG.warn("Failed to list children for " + dir.getPath());
return new File[0];
}
if (sort) {
Arrays.sort(files);
}
return files;
}
/**
* Returns a short path for the given file. The path consists of the name
* of the parent directory and the given file.
*/
public static String getShortPath(File file) {
if (file == null) {
return null;
}
File parent = file.getParentFile();
if (parent == null) {
return file.getName();
}
return parent.getName() + File.separator + file.getName();
}
/**
* Closes the "closable", ignoring any excepetions.
*
* @param closeable The Closable to close, may be {@code null}.
*/
public static void closeQuietly(Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (IOException e) {
// Ignored
}
}
}
private static <T> T timed(FileTask<T> task) {
// long t0 = System.nanoTime();
// try {
return task.execute();
// } finally {
// long t1 = System.nanoTime();
// LOG.debug((t1 - t0) / 1000L + " microsec, " + task);
// }
}
private abstract static class FileTask<T> {
private final String name;
private final File file;
public FileTask(String name, File file) {
this.name = name;
this.file = file;
}
public abstract T execute();
@Override
public String toString() {
return name + ", " + file;
}
}
}
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