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A general programming library in Java/Android. It's easy to learn and simple to use with concise and powerful APIs.
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 com.landawn.abacus.util;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import java.util.StringTokenizer;
/**
* Note: it's copied from Apache Commons IO developed at The Apache Software Foundation, or under the Apache License 2.0.
*
* General File System utilities.
*
* This class provides static utility methods for general file system
* functions not provided via the JDK {@link java.io.File File} class.
*
* The current functions provided are:
*
* - Get the free space on a drive
*
*
* @version $Id: FileSystemUtils.java 1642799 2014-12-02 02:55:39Z sebb $
*/
@SuppressWarnings({ "java:S6548" })
final class FileSystemUtil {
/** Singleton instance, used mainly for testing. */
private static final FileSystemUtil INSTANCE = new FileSystemUtil();
/** Operating system state flag for error. */
private static final int INIT_PROBLEM = -1;
/** Operating system state flag for neither Unix nor Windows. */
private static final int OTHER = 0;
/** Operating system state flag for Windows. */
private static final int WINDOWS = 1;
/** Operating system state flag for Unix. */
private static final int UNIX = 2;
/** Operating system state flag for Posix flavour Unix. */
private static final int POSIX_UNIX = 3;
private static final int OS;
/** The path to df. */
private static final String DF;
static {
String dfPath = "df";
int os = OTHER;
try {
String osName = System.getProperty("os.name");
if (osName == null) {
throw new IOException("os.name not found");
}
osName = osName.toLowerCase(Locale.ENGLISH);
// match
if (osName.contains("windows")) {
os = WINDOWS;
} else if (osName.contains("linux") || osName.contains("mpe/ix") || osName.contains("freebsd") || osName.contains("irix")
|| osName.contains("digital unix") || osName.contains("unix") || osName.contains("mac os x")) {
os = UNIX;
} else if (osName.contains("sun os") || osName.contains("sunos") || osName.contains("solaris")) {
os = POSIX_UNIX;
dfPath = "/usr/xpg4/bin/df"; //NOSONAR
} else if (osName.contains("hp-ux") || osName.contains("aix")) {
os = POSIX_UNIX;
}
} catch (final Exception ex) {
os = INIT_PROBLEM;
}
OS = os;
DF = dfPath;
}
/**
* Instances should NOT be constructed in standard programming.
*/
private FileSystemUtil() {
}
//-----------------------------------------------------------------------
/**
* Returns the free space on a drive or volume in kilobytes by invoking
* the command line.
*
* FileSystemUtils.freeSpaceKb("C:"); // Windows
* FileSystemUtils.freeSpaceKb("/volume"); // *nix
*
* The free space is calculated via the command line.
* It uses 'dir /-c' on Windows, 'df -kP' on AIX/HP-UX and 'df -k' on other Unix.
*
* In order to work, you must be running Windows, or have an implementation of
* Unix df that supports GNU format when passed -k (or -kP). If you are going
* to rely on this code, please check that it works on your OS by running
* some simple tests to compare the command line with the output from this class.
* If your operating system isn't supported, please raise a JIRA call detailing
* the exact result from df -k and as much other detail as possible, thanks.
*
* @param path the path to get free space for, not {@code null}, not empty on Unix
* @return
* @throws IOException if an error occurs when finding the free space
* @throws IllegalArgumentException if the path is invalid
* @throws IllegalStateException if an error occurred in initialisation
*/
public static long freeSpaceKb(final String path) throws IOException {
return freeSpaceKb(path, -1);
}
/**
* Returns the free space on a drive or volume in kilobytes by invoking
* the command line.
*
* FileSystemUtils.freeSpaceKb("C:"); // Windows
* FileSystemUtils.freeSpaceKb("/volume"); // *nix
*
* The free space is calculated via the command line.
* It uses 'dir /-c' on Windows, 'df -kP' on AIX/HP-UX and 'df -k' on other Unix.
*
* In order to work, you must be running Windows, or have an implementation of
* Unix df that supports GNU format when passed -k (or -kP). If you are going
* to rely on this code, please check that it works on your OS by running
* some simple tests to compare the command line with the output from this class.
* If your operating system isn't supported, please raise a JIRA call detailing
* the exact result from df -k and as much other detail as possible, thanks.
*
* @param path the path to get free space for, not {@code null}, not empty on Unix
* @param timeout The timeout amount in milliseconds or no timeout if the value
* is zero or less
* @return
* @throws IOException if an error occurs when finding the free space
* @throws IllegalArgumentException if the path is invalid
* @throws IllegalStateException if an error occurred in initialisation
*/
public static long freeSpaceKb(final String path, final long timeout) throws IOException {
return INSTANCE.freeSpaceOS(path, OS, true, timeout);
}
/**
* Returns the disk size of the volume which holds the working directory.
*
* Identical to:
*
* freeSpaceKb(new File(".").getAbsolutePath())
*
*
* @return
* @throws IOException if an error occurs when finding the free space
* @throws IllegalStateException if an error occurred in initialisation
*/
public static long freeSpaceKb() throws IOException {
return freeSpaceKb(-1);
}
/**
* Returns the disk size of the volume which holds the working directory.
*
* Identical to:
*
* freeSpaceKb(new File(".").getAbsolutePath())
*
*
* @param timeout The timeout amount in milliseconds or no timeout if the value
* is zero or less
* @return
* @throws IOException if an error occurs when finding the free space
* @throws IllegalStateException if an error occurred in initialisation
*/
public static long freeSpaceKb(final long timeout) throws IOException {
return freeSpaceKb(new File(".").getAbsolutePath(), timeout);
}
//-----------------------------------------------------------------------
/**
* Returns the free space on a drive or volume in a cross-platform manner.
* Note that some OS's are NOT currently supported, including OS/390.
*
* FileSystemUtils.freeSpace("C:"); // Windows
* FileSystemUtils.freeSpace("/volume"); // *nix
*
* The free space is calculated via the command line.
* It uses 'dir /-c' on Windows and df on *nix.
*
* @param path the path to get free space for, not {@code null}, not empty on Unix
* @param os the operating system code
* @param kb whether to normalize to kilobytes
* @param timeout The timeout amount in milliseconds or no timeout if the value
* is zero or less
* @return
* @throws IOException if an error occurs when finding the free space
* @throws IllegalArgumentException if the path is invalid
* @throws IllegalStateException if an error occurred in initialisation
*/
long freeSpaceOS(final String path, final int os, final boolean kb, final long timeout) throws IOException {
if (path == null) {
throw new IllegalArgumentException("Path must not be null");
}
switch (os) {
case WINDOWS:
return kb ? freeSpaceWindows(path, timeout) / 1024 : freeSpaceWindows(path, timeout);
case UNIX:
return freeSpaceUnix(path, kb, false, timeout);
case POSIX_UNIX:
return freeSpaceUnix(path, kb, true, timeout);
case OTHER:
throw new IllegalStateException("Unsupported operating system");
default:
throw new IllegalStateException("Exception caught when determining operating system");
}
}
//-----------------------------------------------------------------------
/**
* Find free space on the Windows platform using the dir command.
*
* @param path the path to get free space for, including the colon
* @param timeout The timeout amount in milliseconds or no timeout if the value
* is zero or less
* @return
* @throws IOException if an error occurs
*/
long freeSpaceWindows(String path, final long timeout) throws IOException {
path = FilenameUtil.normalize(path, false);
if (!path.isEmpty() && path.charAt(0) != '"') {
path = "\"" + path + "\"";
}
// build and run the 'dir' command
final String[] cmdAttrs = { "cmd.exe", "/C", "dir /a /-c " + path };
// read in the output of the command to an ArrayList
final List lines = performCommand(cmdAttrs, Integer.MAX_VALUE, timeout);
// now iterate over the lines we just read and find the LAST
// non-empty line (the free space bytes should be in the last element
// of the ArrayList anyway, but this will ensure it works even if it's
// not, still assuming it is on the last non-blank line)
for (int i = lines.size() - 1; i >= 0; i--) {
final String line = lines.get(i);
if (!line.isEmpty()) {
return parseDir(line, path);
}
}
// all lines are blank
throw new IOException("Command line 'dir /-c' did not return any info " + "for path '" + path + "'"); //NOSONAR
}
/**
* Parses the Windows dir response last line.
*
* @param line the line to parse
* @param path the path that was sent
* @return
* @throws IOException if an error occurs
*/
long parseDir(final String line, final String path) throws IOException {
// read from the end of the line to find the last numeric
// character on the line, then continue until we find the first
// non-numeric character, and everything between that and the last
// numeric character inclusive is our free space bytes count
int bytesStart = 0;
int bytesEnd = 0;
int j = line.length() - 1;
innerLoop1: while (j >= 0) { //NOSONAR
final char c = line.charAt(j);
if (Character.isDigit(c)) {
// found the last numeric character, this is the end of
// the free space bytes count
bytesEnd = j + 1;
//noinspection UnnecessaryLabelOnBreakStatement
break innerLoop1;
}
j--;
}
innerLoop2: while (j >= 0) { //NOSONAR
final char c = line.charAt(j);
if (!Character.isDigit(c) && c != ',' && c != '.') {
// found the next non-numeric character, this is the
// beginning of the free space bytes count
bytesStart = j + 1;
//noinspection UnnecessaryLabelOnBreakStatement
break innerLoop2;
}
j--;
}
if (j < 0) {
throw new IOException("Command line 'dir /-c' did not return valid info " + "for path '" + path + "'");
}
// remove commas and dots in the bytes count
final StringBuilder buf = new StringBuilder(line.substring(bytesStart, bytesEnd));
for (int k = 0; k < buf.length(); k++) {
if (buf.charAt(k) == ',' || buf.charAt(k) == '.') {
buf.deleteCharAt(k--);
}
}
return parseBytes(buf.toString(), path);
}
//-----------------------------------------------------------------------
/**
* Find free space on the *nix platform using the df command.
*
* @param path the path to get free space for
* @param kb whether to normalize to kilobytes
* @param posix whether to use the POSIX standard format flag
* @param timeout The timeout amount in milliseconds or no timeout if the value
* is zero or less
* @return
* @throws IOException if an error occurs
*/
long freeSpaceUnix(final String path, final boolean kb, final boolean posix, final long timeout) throws IOException {
if (path.isEmpty()) {
throw new IllegalArgumentException("Path must not be empty");
}
// build and run the 'dir' command
String flags = "-";
if (kb) {
flags += "k";
}
if (posix) {
flags += "P";
}
final String[] cmdAttrs = flags.length() > 1 ? new String[] { DF, flags, path } : new String[] { DF, path };
// perform the command, asking for up to 3 lines (header, interesting, overflow)
final List lines = performCommand(cmdAttrs, 3, timeout);
if (lines.size() < 2) {
// unknown problem, throw exception
throw new IOException("Command line '" + DF + "' did not return info as expected " + "for path '" + path + "'- response was " + lines); //NOSONAR
}
final String line2 = lines.get(1); // the line we're interested in
// Now, we tokenize the string. The fourth element is what we want.
StringTokenizer tok = new StringTokenizer(line2, " ");
if (tok.countTokens() < 4) {
// could be long Filesystem, thus data on third line
if (tok.countTokens() == 1 && lines.size() >= 3) {
final String line3 = lines.get(2); // the line may be interested in
tok = new StringTokenizer(line3, " ");
} else {
throw new IOException("Command line '" + DF + "' did not return data as expected " + "for path '" + path + "'- check path is valid"); //NOSONAR
}
} else {
tok.nextToken(); // Ignore Filesystem
}
tok.nextToken(); // Ignore 1K-blocks
tok.nextToken(); // Ignore Used
final String freeSpace = tok.nextToken();
return parseBytes(freeSpace, path);
}
//-----------------------------------------------------------------------
/**
* Parses the bytes from a string.
*
* @param freeSpace the free space string
* @param path
* @return
* @throws IOException if an error occurs
*/
long parseBytes(final String freeSpace, final String path) throws IOException {
try {
final long bytes = Long.parseLong(freeSpace);
if (bytes < 0) {
throw new IOException("Command line '" + DF + "' did not find free space in response " + "for path '" + path + "'- check path is valid");
}
return bytes;
} catch (final NumberFormatException ex) {
throw new IOException("Command line '" + DF + "' did not return numeric data as expected " + "for path '" + path + "'- check path is valid", ex);
}
}
//-----------------------------------------------------------------------
/**
* Performs the os command.
*
* @param cmdAttrs the command line parameters
* @param max The maximum limit for the lines returned
* @param timeout The timeout amount in milliseconds or no timeout if the value
* is zero or less
* @return
* @throws IOException if an error occurs
*/
List performCommand(final String[] cmdAttrs, final int max, final long timeout) throws IOException {
// this method does what it can to avoid the 'Too many open files' error
// based on trial and error and these links:
// http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4784692
// http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4801027
// http://forum.java.sun.com/thread.jspa?threadID=533029&messageID=2572018
// however, it's still not perfect as the JDK support is so poor
// (see commons-exec or Ant for a better multi-thread multi-os solution)
final List lines = new ArrayList<>(20);
Process proc = null;
InputStream in = null;
OutputStream out = null;
InputStream err = null;
BufferedReader inr = null;
try { //NOSONAR
final Thread monitor = ThreadMonitor.start(timeout);
proc = openProcess(cmdAttrs);
in = proc.getInputStream();
out = proc.getOutputStream();
err = proc.getErrorStream();
// default charset is most likely appropriate here
inr = new BufferedReader(IOUtil.newInputStreamReader(in, Charset.defaultCharset()));
String line = inr.readLine();
while (line != null && lines.size() < max) {
line = line.toLowerCase(Locale.ENGLISH).trim();
lines.add(line);
line = inr.readLine();
}
proc.waitFor();
ThreadMonitor.stop(monitor);
if (proc.exitValue() != 0) {
// os command problem, throw exception
throw new IOException("Command line returned OS error code '" + proc.exitValue() + "' for command " + Arrays.asList(cmdAttrs));
}
if (lines.isEmpty()) {
// unknown problem, throw exception
throw new IOException("Command line did not return any info " + "for command " + Arrays.asList(cmdAttrs));
}
return lines;
} catch (final InterruptedException ex) {
throw new IOException("Command line threw an InterruptedException " + "for command " + Arrays.asList(cmdAttrs) + " timeout=" + timeout, ex);
} finally {
IOUtil.closeQuietly(in);
IOUtil.closeQuietly(out);
IOUtil.closeQuietly(err);
IOUtil.closeQuietly(inr);
if (proc != null) {
proc.destroy();
}
}
}
/**
* Opens the process to the operating system.
*
* @param cmdAttrs the command line parameters
* @return
* @throws IOException if an error occurs
*/
Process openProcess(final String[] cmdAttrs) throws IOException {
return Runtime.getRuntime().exec(cmdAttrs);
}
}
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