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/*
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This file is part of Airsonic.
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Airsonic is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Airsonic is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Airsonic. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2016 (C) Airsonic Authors
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Based upon Subsonic, Copyright 2009 (C) Sindre Mehus
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*/
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package org.airsonic.player.util;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.Closeable;
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import java.io.File;
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import java.io.IOException;
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/**
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* Miscellaneous file utility methods.
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*
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* @author Sindre Mehus
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*/
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public final class FileUtil {
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private static final Logger LOG = LoggerFactory.getLogger(FileUtil.class);
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/**
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* Disallow external instantiation.
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*/
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private FileUtil() {
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}
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public static boolean isFile(final File file) {
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return timed(new FileTask<Boolean>("isFile", file) {
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@Override
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public Boolean execute() {
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return file.isFile();
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}
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});
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}
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public static boolean isDirectory(final File file) {
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return timed(new FileTask<Boolean>("isDirectory", file) {
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@Override
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public Boolean execute() {
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return file.isDirectory();
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}
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});
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}
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public static boolean exists(final File file) {
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return timed(new FileTask<Boolean>("exists", file) {
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@Override
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public Boolean execute() {
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return file.exists();
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}
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});
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}
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public static boolean exists(String path) {
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return exists(new File(path));
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}
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public static long lastModified(final File file) {
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return timed(new FileTask<Long>("lastModified", file) {
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@Override
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public Long execute() {
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return file.lastModified();
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}
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});
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}
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public static long length(final File file) {
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return timed(new FileTask<Long>("length", file) {
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@Override
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public Long execute() {
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return file.length();
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}
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});
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}
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/**
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* Similar to {@link File#listFiles()}, but never returns null.
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* Instead a warning is logged, and an empty array is returned.
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*/
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public static File[] listFiles(final File dir) {
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File[] files = timed(new FileTask<File[]>("listFiles", dir) {
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@Override
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public File[] execute() {
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return dir.listFiles();
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}
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});
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if (files == null) {
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LOG.warn("Failed to list children for " + dir.getPath());
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return new File[0];
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}
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return files;
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}
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/**
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* Returns a short path for the given file. The path consists of the name
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* of the parent directory and the given file.
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*/
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public static String getShortPath(File file) {
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if (file == null) {
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return null;
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}
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File parent = file.getParentFile();
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if (parent == null) {
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return file.getName();
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}
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return parent.getName() + File.separator + file.getName();
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}
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/**
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* Closes the "closable", ignoring any excepetions.
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*
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* @param closeable The Closable to close, may be {@code null}.
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*/
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public static void closeQuietly(Closeable closeable) {
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if (closeable != null) {
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try {
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closeable.close();
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} catch (IOException e) {
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// Ignored
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}
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}
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}
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private static <T> T timed(FileTask<T> task) {
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return task.execute();
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}
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private abstract static class FileTask<T> {
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private final String name;
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private final File file;
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public FileTask(String name, File file) {
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this.name = name;
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this.file = file;
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}
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public abstract T execute();
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@Override
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public String toString() {
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return name + ", " + file;
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}
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}
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}
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