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bndlib: A Swiss Army Knife for OSGi
package aQute.lib.io;
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.toList;
import java.io.BufferedReader;
import java.io.CharArrayWriter;
import java.io.Closeable;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.EOFException;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.Flushable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.StringReader;
import java.io.UTFDataFormatException;
import java.io.UncheckedIOException;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.FileChannel.MapMode;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.nio.charset.Charset;
import java.nio.file.AtomicMoveNotSupportedException;
import java.nio.file.FileAlreadyExistsException;
import java.nio.file.FileVisitOption;
import java.nio.file.FileVisitResult;
import java.nio.file.FileVisitor;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.nio.file.StandardOpenOption;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileTime;
import java.security.MessageDigest;
import java.text.CollationKey;
import java.text.Collator;
import java.util.Collection;
import java.util.Comparator;
import java.util.EnumSet;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.function.BiPredicate;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import aQute.bnd.exceptions.ConsumerWithException;
import aQute.lib.stringrover.StringRover;
import aQute.libg.glob.Glob;
public class IO {
private static final Pattern WINDOWS_MACROS = Pattern.compile("%([^%]+)%");
private static final int BUFFER_SIZE = IOConstants.PAGE_SIZE * 16;
private static final int DIRECT_MAP_THRESHOLD = BUFFER_SIZE;
private static final boolean isWindows = File.separatorChar == '\\';
static final public File work = new File(
System.getProperty("user.dir"));
static final public File home;
static final public File JAVA_HOME;
private static final EnumSet writeOptions = EnumSet.of(StandardOpenOption.WRITE,
StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING);
private static final EnumSet readOptions = EnumSet.of(StandardOpenOption.READ);
static {
EnvironmentCalculator hc = new EnvironmentCalculator(isWindows);
home = hc.getHome();
JAVA_HOME = hc.getJavaHome();
}
public static String getExtension(String fileName, String deflt) {
int n = fileName.lastIndexOf('.');
if (n < 0)
return deflt;
return fileName.substring(n + 1);
}
public static Collection tree(File current) {
Set files = new LinkedHashSet<>();
traverse(files, current, null);
return files;
}
public static Collection tree(File current, String glob) {
Set files = new LinkedHashSet<>();
traverse(files, current, glob == null ? null : new Glob(glob));
return files;
}
private static void traverse(Collection files, File current, Glob glob) {
if (current.isFile() && (glob == null || glob.matcher(current.getName())
.matches())) {
files.add(current);
} else if (current.isDirectory()) {
for (File sub : listFiles(current)) {
traverse(files, sub, glob);
}
}
}
public static Collator fileCollator() {
Collator collator = Collator.getInstance(Locale.ROOT);
collator.setDecomposition(Collator.CANONICAL_DECOMPOSITION);
collator.setStrength(Collator.IDENTICAL); // case-sensitive
return collator;
}
public static Comparator fileComparator(Function keyExtractor) {
return Comparator.comparing(keyExtractor, fileCollator()::compare);
}
public static Stream listStream(File dir, BiPredicate filter) {
if ((dir != null) && dir.isDirectory()) {
String[] names = dir.list();
if (names != null) {
Stream result = StreamSupport
.stream(Spliterators. spliterator(names,
Spliterator.ORDERED | Spliterator.IMMUTABLE | Spliterator.DISTINCT), false)
.filter(name -> filter.test(dir, name))
.map(fileCollator()::getCollationKey)
.sorted()
.map(CollationKey::getSourceString);
return result;
}
}
return Stream.empty();
}
public static Stream listStream(File dir) {
return listStream(dir, (d, n) -> true);
}
public static List list(File dir, BiPredicate filter) {
try (Stream stream = listStream(dir, filter)) {
return stream.collect(toList());
}
}
public static List list(File dir) {
return list(dir, (d, n) -> true);
}
public static List listFiles(File dir, BiPredicate filter) {
try (Stream stream = listStream(dir, filter)) {
return stream.map(name -> new File(dir, name))
.collect(toList());
}
}
public static List listFiles(File dir) {
return listFiles(dir, (d, n) -> true);
}
public static Stream listStream(Path dir, Predicate filter) {
if ((dir != null) && Files.isDirectory(dir)) {
try {
Stream result = Files.list(dir)
.filter(filter)
.map(Path::getFileName)
.map(Path::toString)
.map(fileCollator()::getCollationKey)
.sorted()
.map(CollationKey::getSourceString);
return result;
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
return Stream.empty();
}
public static Stream listStream(Path dir, BiPredicate filter) {
if ((dir != null) && Files.isDirectory(dir)) {
try {
Stream result = Files.list(dir)
.map(Path::getFileName)
.map(Path::toString)
.filter(name -> filter.test(dir, name))
.map(fileCollator()::getCollationKey)
.sorted()
.map(CollationKey::getSourceString);
return result;
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
return Stream.empty();
}
public static Stream listStream(Path dir) {
return listStream(dir, p -> true);
}
public static List list(Path dir, Predicate filter) {
try (Stream stream = listStream(dir, filter)) {
return stream.collect(toList());
}
}
public static List list(Path dir, BiPredicate filter) {
try (Stream stream = listStream(dir, filter)) {
return stream.collect(toList());
}
}
public static List list(Path dir) {
return list(dir, p -> true);
}
public static List listPaths(Path dir, Predicate filter) {
try (Stream stream = listStream(dir, filter)) {
return stream.map(name -> dir.resolve(name))
.collect(toList());
}
}
public static List listPaths(Path dir, BiPredicate filter) {
try (Stream stream = listStream(dir, filter)) {
return stream.map(name -> dir.resolve(name))
.collect(toList());
}
}
public static List listPaths(Path dir) {
return listPaths(dir, p -> true);
}
public static File copy(byte[] data, File file) throws IOException {
copy(data, file.toPath());
return file;
}
public static Path copy(byte[] data, Path path) throws IOException {
try (FileChannel out = writeChannel(path)) {
ByteBuffer bb = ByteBuffer.wrap(data);
while (bb.hasRemaining()) {
out.write(bb);
}
}
return path;
}
public static Writer copy(byte[] data, Writer w) throws IOException {
w.write(new String(data, 0, data.length, UTF_8));
return w;
}
public static OutputStream copy(byte[] data, OutputStream out) throws IOException {
out.write(data, 0, data.length);
return out;
}
public static Writer copy(Reader r, Writer w) throws IOException {
try {
char[] buffer = new char[BUFFER_SIZE];
for (int size; (size = r.read(buffer, 0, buffer.length)) > 0;) {
w.write(buffer, 0, size);
}
return w;
} finally {
r.close();
}
}
public static OutputStream copy(Reader r, OutputStream out) throws IOException {
return copy(r, out, UTF_8);
}
public static OutputStream copy(Reader r, OutputStream out, String charset) throws IOException {
return copy(r, out, Charset.forName(charset));
}
public static OutputStream copy(Reader r, OutputStream out, Charset charset) throws IOException {
Writer w = writer(out, charset);
try {
copy(r, w);
return out;
} finally {
w.flush();
}
}
public static Writer copy(InputStream in, Writer w) throws IOException {
return copy(in, w, UTF_8);
}
public static Writer copy(InputStream in, Writer w, String charset) throws IOException {
return copy(in, w, Charset.forName(charset));
}
public static Writer copy(InputStream in, Writer w, Charset charset) throws IOException {
return copy(reader(in, charset), w);
}
/**
* If InputStream throws EOFException, map it to returning -1. Other
* IOExceptions are propagated.
*/
private static int read(InputStream in, byte[] b, int off, int len) throws IOException {
try {
return in.read(b, off, len);
} catch (EOFException e) {
return -1;
}
}
/**
* If ReadableByteChannel throws EOFException, map it to returning -1. Other
* IOExceptions are propagated.
*/
private static int read(ReadableByteChannel in, ByteBuffer bb) throws IOException {
try {
return in.read(bb);
} catch (EOFException e) {
return -1;
}
}
public static OutputStream copy(InputStream in, OutputStream out) throws IOException {
try {
byte[] buffer = new byte[BUFFER_SIZE];
for (int size; (size = read(in, buffer, 0, buffer.length)) > 0;) {
out.write(buffer, 0, size);
}
return out;
} finally {
in.close();
}
}
public static OutputStream copy(InputStream in, OutputStream out, int limit) throws IOException {
return copy(new LimitedInputStream(in, limit), out);
}
public static ByteBufferOutputStream copy(InputStream in, ByteBufferOutputStream out) throws IOException {
try {
out.write(in);
return out;
} finally {
in.close();
}
}
public static DataOutput copy(InputStream in, DataOutput out) throws IOException {
try {
byte[] buffer = new byte[BUFFER_SIZE];
for (int size; (size = read(in, buffer, 0, buffer.length)) > 0;) {
out.write(buffer, 0, size);
}
return out;
} finally {
in.close();
}
}
public static WritableByteChannel copy(ReadableByteChannel in, WritableByteChannel out) throws IOException {
try {
ByteBuffer bb = ByteBuffer.allocateDirect(BUFFER_SIZE);
while (read(in, bb) > 0) {
bb.flip();
out.write(bb);
bb.compact();
}
for (bb.flip(); bb.hasRemaining();) {
out.write(bb);
}
return out;
} finally {
in.close();
}
}
public static ByteBuffer copy(InputStream in, ByteBuffer bb) throws IOException {
try {
if (bb.hasArray()) {
byte[] buffer = bb.array();
int offset = bb.arrayOffset();
for (int size, position; bb.hasRemaining()
&& (size = read(in, buffer, offset + (position = bb.position()), bb.remaining())) > 0;) {
bb.position(position + size);
}
} else {
int length = Math.min(bb.remaining(), BUFFER_SIZE);
byte[] buffer = new byte[length];
for (int size; length > 0 && (size = read(in, buffer, 0, length)) > 0;) {
bb.put(buffer, 0, size);
length = Math.min(bb.remaining(), buffer.length);
}
}
return bb;
} finally {
in.close();
}
}
public static byte[] copy(InputStream in, byte[] data) throws IOException {
return copy(in, data, 0, data.length);
}
public static byte[] copy(InputStream in, byte[] data, int off, int len) throws IOException {
try {
for (int remaining, size; (remaining = len - off) > 0 && (size = read(in, data, off, remaining)) > 0;) {
off += size;
}
return data;
} finally {
in.close();
}
}
public static OutputStream copy(ByteBuffer bb, OutputStream out) throws IOException {
if (out instanceof ByteBufferOutputStream) {
ByteBufferOutputStream bbout = (ByteBufferOutputStream) out;
bbout.write(bb);
} else if (bb.hasArray()) {
out.write(bb.array(), bb.arrayOffset() + bb.position(), bb.remaining());
bb.position(bb.limit());
} else {
int length = Math.min(bb.remaining(), BUFFER_SIZE);
byte[] buffer = new byte[length];
while (length > 0) {
bb.get(buffer, 0, length);
out.write(buffer, 0, length);
length = Math.min(bb.remaining(), buffer.length);
}
}
return out;
}
public static DataOutput copy(ByteBuffer bb, DataOutput out) throws IOException {
if (out instanceof ByteBufferDataOutput) {
ByteBufferDataOutput bbout = (ByteBufferDataOutput) out;
bbout.write(bb);
} else if (bb.hasArray()) {
out.write(bb.array(), bb.arrayOffset() + bb.position(), bb.remaining());
bb.position(bb.limit());
} else {
int length = Math.min(bb.remaining(), BUFFER_SIZE);
byte[] buffer = new byte[length];
while (length > 0) {
bb.get(buffer, 0, length);
out.write(buffer, 0, length);
length = Math.min(bb.remaining(), buffer.length);
}
}
return out;
}
public static MessageDigest copy(URL url, MessageDigest md) throws IOException {
return copy(stream(url), md);
}
public static MessageDigest copy(File file, MessageDigest md) throws IOException {
return copy(file.toPath(), md);
}
public static MessageDigest copy(Path path, MessageDigest md) throws IOException {
return copy(readChannel(path), md);
}
public static MessageDigest copy(URLConnection conn, MessageDigest md) throws IOException {
return copy(conn.getInputStream(), md);
}
public static MessageDigest copy(InputStream in, MessageDigest md) throws IOException {
try {
byte[] buffer = new byte[BUFFER_SIZE];
for (int size; (size = read(in, buffer, 0, buffer.length)) > 0;) {
md.update(buffer, 0, size);
}
return md;
} finally {
in.close();
}
}
public static MessageDigest copy(ReadableByteChannel in, MessageDigest md) throws IOException {
try {
ByteBuffer bb = ByteBuffer.allocate(BUFFER_SIZE);
while (read(in, bb) > 0) {
bb.flip();
md.update(bb);
bb.compact();
}
for (bb.flip(); bb.hasRemaining();) {
md.update(bb);
}
return md;
} finally {
in.close();
}
}
public static File copy(URL url, File file) throws IOException {
return copy(stream(url), file);
}
public static File copy(URLConnection conn, File file) throws IOException {
return copy(conn.getInputStream(), file);
}
public static URL copy(InputStream in, URL url) throws IOException {
return copy(in, url, null);
}
public static URL copy(InputStream in, URL url, String method) throws IOException {
URLConnection c = url.openConnection();
HttpURLConnection http = (c instanceof HttpURLConnection) ? (HttpURLConnection) c : null;
if (http != null && method != null) {
http.setRequestMethod(method);
}
c.setDoOutput(true);
try (OutputStream out = c.getOutputStream()) {
copy(in, out);
return url;
} finally {
if (http != null) {
http.disconnect();
}
}
}
public static File copy(File src, File tgt) throws IOException {
copy(src.toPath(), tgt.toPath());
return tgt;
}
public static Path copy(Path src, Path tgt) throws IOException {
final Path source = src.toAbsolutePath();
final Path target = tgt.toAbsolutePath();
if (Files.isRegularFile(source)) {
Files.copy(source, target, StandardCopyOption.REPLACE_EXISTING);
return tgt;
}
if (Files.isDirectory(source)) {
if (Files.notExists(target)) {
mkdirs(target);
}
if (!Files.isDirectory(target))
throw new IllegalArgumentException("target directory for a directory must be a directory: " + target);
if (target.startsWith(source))
throw new IllegalArgumentException("target directory can not be child of source directory.");
Files.walkFileTree(source, EnumSet.of(FileVisitOption.FOLLOW_LINKS), Integer.MAX_VALUE,
new FileVisitor() {
final FileTime now = FileTime.fromMillis(System.currentTimeMillis());
@Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
Path targetdir = target.resolve(source.relativize(dir));
try {
Files.copy(dir, targetdir);
} catch (FileAlreadyExistsException e) {
if (!Files.isDirectory(targetdir))
throw e;
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
Path targetFile = target.resolve(source.relativize(file));
Files.copy(file, targetFile, StandardCopyOption.REPLACE_EXISTING);
Files.setLastModifiedTime(targetFile, now);
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException {
if (exc != null) { // directory iteration failed
throw exc;
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
if (exc != null) {
throw exc;
}
return FileVisitResult.CONTINUE;
}
});
return tgt;
}
throw new FileNotFoundException("During copy: " + source.toString());
}
public static File copy(InputStream in, File file) throws IOException {
copy(in, file.toPath());
return file;
}
public static Path copy(InputStream in, Path path) throws IOException {
try (FileChannel out = writeChannel(path)) {
copy(in, out);
}
return path;
}
public static OutputStream copy(File file, OutputStream out) throws IOException {
return copy(file.toPath(), out);
}
public static OutputStream copy(Path path, OutputStream out) throws IOException {
return copy(readChannel(path), out);
}
public static WritableByteChannel copy(InputStream in, WritableByteChannel out) throws IOException {
try {
ByteBuffer bb = ByteBuffer.allocate(BUFFER_SIZE);
byte[] buffer = bb.array();
for (int size, position; (size = read(in, buffer, position = bb.position(), bb.remaining())) > 0;) {
bb.position(position + size);
bb.flip();
out.write(bb);
bb.compact();
}
for (bb.flip(); bb.hasRemaining();) {
out.write(bb);
}
return out;
} finally {
in.close();
}
}
public static OutputStream copy(ReadableByteChannel in, OutputStream out) throws IOException {
try {
ByteBuffer bb = ByteBuffer.allocate(BUFFER_SIZE);
byte[] buffer = bb.array();
for (; read(in, bb) > 0; bb.clear()) {
out.write(buffer, 0, bb.position());
}
return out;
} finally {
in.close();
}
}
public static byte[] read(File file) throws IOException {
try (FileChannel in = readChannel(file.toPath())) {
ByteBuffer bb = ByteBuffer.allocate((int) in.size());
while (read(in, bb) > 0) {}
return bb.array();
}
}
public static ByteBuffer read(Path path) throws IOException {
try (FileChannel in = readChannel(path)) {
long size = in.size();
if (!isWindows && (size > DIRECT_MAP_THRESHOLD)) {
return in.map(MapMode.READ_ONLY, 0, size);
}
ByteBuffer bb = ByteBuffer.allocate((int) size);
while (read(in, bb) > 0) {}
bb.flip();
return bb;
}
}
public static byte[] read(ByteBuffer bb) {
byte[] data = new byte[bb.remaining()];
bb.get(data, 0, data.length);
return data;
}
public static byte[] read(URL url) throws IOException {
URLConnection conn = url.openConnection();
conn.connect();
int length = conn.getContentLength();
if (length == -1) {
return read(conn.getInputStream());
}
return copy(conn.getInputStream(), new byte[length]);
}
public static byte[] read(InputStream in) throws IOException {
return copy(in, new ByteBufferOutputStream()).toByteArray();
}
public static void write(byte[] data, OutputStream out) throws IOException {
copy(data, out);
}
public static void write(byte[] data, File file) throws IOException {
copy(data, file);
}
public static String collect(File file) throws IOException {
return collect(file.toPath(), UTF_8);
}
public static String collect(File file, String encoding) throws IOException {
return collect(file.toPath(), Charset.forName(encoding));
}
public static String collect(File file, Charset encoding) throws IOException {
return collect(file.toPath(), encoding);
}
public static String collect(Path path) throws IOException {
return collect(path, UTF_8);
}
public static String collect(Path path, Charset encoding) throws IOException {
return collect(reader(path, encoding));
}
public static String collect(ByteBuffer bb, Charset encoding) {
return decode(bb, encoding).toString();
}
public static String collect(URL url, String encoding) throws IOException {
return collect(stream(url), Charset.forName(encoding));
}
public static String collect(URL url, Charset encoding) throws IOException {
return collect(stream(url), encoding);
}
public static String collect(URL url) throws IOException {
return collect(url, UTF_8);
}
public static String collect(String path) throws IOException {
return collect(Paths.get(path), UTF_8);
}
public static String collect(InputStream in) throws IOException {
return collect(in, UTF_8);
}
public static String collect(InputStream in, String encoding) throws IOException {
return collect(in, Charset.forName(encoding));
}
public static String collect(InputStream in, Charset encoding) throws IOException {
return collect(reader(in, encoding));
}
public static String collect(Reader r) throws IOException {
return copy(r, new CharArrayWriter()).toString();
}
/**
* Create a temporary file.
*
* @param directory the directory in which to create the file. Can be null,
* in which case the system TMP directory is used
* @param pattern the filename prefix pattern. Must be at least 3 characters
* long
* @param suffix the filename suffix. Can be null, in which case (system)
* default suffix is used
* @return temp file
* @throws IllegalArgumentException when pattern is null or too short
* @throws IOException when the specified (non-null) directory is not a
* directory
*/
public static File createTempFile(File directory, String pattern, String suffix)
throws IllegalArgumentException, IOException {
if ((pattern == null) || (pattern.length() < 3)) {
throw new IllegalArgumentException(
"Pattern must be at least 3 characters long, got " + ((pattern == null) ? "null" : pattern.length()));
}
if ((directory != null) && !directory.isDirectory()) {
throw new FileNotFoundException("Directory " + directory + " is not a directory");
}
return File.createTempFile(pattern, suffix, directory);
}
public static String absolutePath(File file) {
return normalizePath(file.getAbsolutePath());
}
public static String absolutePath(Path path) {
return normalizePath(path.toAbsolutePath());
}
public static String normalizePath(Path path) {
return normalizePath(path.toString());
}
public static String normalizePath(File file) {
return normalizePath(file.getPath());
}
public static String normalizePath(String path) {
return path.replace(File.separatorChar, '/');
}
public static File getFile(String file) {
return getFile(work, file);
}
public static File getFile(File base, String file) {
StringRover rover = new StringRover(file);
if (rover.startsWith("~/")) {
rover.increment(2);
if (!rover.startsWith("~/")) {
return getFile(home, rover.substring(0));
}
}
if (rover.startsWith("~")) {
return getFile(home.getParentFile(), rover.substring(1));
}
File f = new File(rover.substring(0));
if (f.isAbsolute()) {
return f;
}
if (base == null) {
base = work;
}
for (f = base.getAbsoluteFile(); !rover.isEmpty();) {
int n = rover.indexOf('/');
if (n < 0) {
n = rover.length();
}
if ((n == 0) || ((n == 1) && (rover.charAt(0) == '.'))) {
// case "" or "."
} else if ((n == 2) && (rover.charAt(0) == '.') && (rover.charAt(1) == '.')) {
// case ".."
File parent = f.getParentFile();
if (parent != null) {
f = parent;
}
} else {
String segment = rover.substring(0, n);
f = new File(f, segment);
}
rover.increment(n + 1);
}
return f.getAbsoluteFile();
}
public static File getBasedFile(File base, String file) throws IOException {
base = base.getCanonicalFile();
File child = getFile(base, file);
if (child.getCanonicalPath()
.startsWith(base.getCanonicalPath()
.concat(File.separator))) {
return child;
}
throw new IOException("The file " + child + " is outside of the base " + base);
}
public static Path getPath(String file) {
return getPath(work.toPath(), file);
}
public static Path getPath(Path base, String file) {
StringRover rover = new StringRover(file);
if (rover.startsWith("~/")) {
rover.increment(2);
if (!rover.startsWith("~/")) {
return getPath(home.toPath(), rover.substring(0));
}
}
if (rover.startsWith("~")) {
return getPath(home.toPath()
.getParent(), rover.substring(1));
}
Path f = new File(rover.substring(0)).toPath();
if (f.isAbsolute()) {
return f;
}
if (base == null) {
base = work.toPath();
}
for (f = base.normalize()
.toAbsolutePath(); !rover.isEmpty();) {
int n = rover.indexOf('/');
if (n < 0) {
n = rover.length();
}
String segment = rover.substring(0, n);
f = f.resolve(segment)
.normalize();
rover.increment(n + 1);
}
return f.toAbsolutePath();
}
public static Path getBasedPath(Path base, String file) throws IOException {
base = base.normalize()
.toAbsolutePath();
Path child = getPath(base, file);
if (child.startsWith(base)) {
return child;
}
throw new IOException("The file " + child + " is outside of the base " + base);
}
/**
* Deletes the specified file. Folders are recursively deleted.
* If file(s) cannot be deleted, no feedback is provided (fail silently).
*
* @param file file to be deleted
*/
public static void delete(File file) {
delete(file.toPath());
}
/**
* Deletes the specified content of the given directory. Folders are
* recursively deleted. This method will not delete the given dir, this can
* be useful in Eclipse or other systems that detect delete-create
* If file(s) cannot be deleted, no feedback is provided (fail silently).
*
* @param dir of whose contents are to be deleted
*/
public static void deleteContent(File dir) {
if (!dir.isDirectory())
return;
Stream.of(dir.listFiles())
.forEach(IO::delete);
}
/**
* Deletes the specified path. Folders are recursively deleted.
* If file(s) cannot be deleted, no feedback is provided (fail silently).
*
* @param path path to be deleted
*/
public static void delete(Path path) {
try {
deleteWithException(path);
} catch (IOException e) {
// Ignore a failed delete
}
}
/**
* Deletes and creates directories
*/
public static void initialize(File dir) {
try {
deleteWithException(dir);
mkdirs(dir);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
/**
* Deletes the specified file. Folders are recursively deleted.
* Throws exception if any of the files could not be deleted.
*
* @param file file to be deleted
* @throws IOException if the file (or contents of a folder) could not be
* deleted
*/
public static void deleteWithException(File file) throws IOException {
deleteWithException(file.toPath());
}
/**
* Deletes the specified path. Folders are recursively deleted.
* Throws exception if any of the files could not be deleted.
*
* @param path path to be deleted
* @throws IOException if the path (or contents of a folder) could not be
* deleted
*/
public static void deleteWithException(Path path) throws IOException {
path = path.toAbsolutePath();
if (Files.notExists(path) && !isSymbolicLink(path)) {
return;
}
if (path.equals(path.getRoot()))
throw new IllegalArgumentException("Cannot recursively delete root for safety reasons");
Files.walkFileTree(path, new FileVisitor() {
@Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
return FileVisitResult.CONTINUE;
}
@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 {
try {
Files.delete(file);
} catch (IOException e) {
throw exc;
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
if (exc != null) { // directory iteration failed
throw exc;
}
Files.delete(dir);
return FileVisitResult.CONTINUE;
}
});
}
/**
* Renames from to to replacing the target file if
* necessary.
*
* @param from source file
* @param to destination file
* @throws IOException if the rename operation fails
*/
public static File rename(File from, File to) throws IOException {
return rename(from.toPath(), to.toPath()).toFile();
}
/**
* Renames from to to replacing the target file if
* necessary.
*
* @param from source path
* @param to destination path
* @throws IOException if the rename operation fails
*/
public static Path rename(Path from, Path to) throws IOException {
try {
return Files.move(from, to, StandardCopyOption.REPLACE_EXISTING, StandardCopyOption.ATOMIC_MOVE);
} catch (AtomicMoveNotSupportedException e) {
return Files.move(from, to, StandardCopyOption.REPLACE_EXISTING);
}
}
public static File mkdirs(File dir) throws IOException {
return mkdirs(dir.toPath()).toFile();
}
public static Path mkdirs(Path dir) throws IOException {
if (Files.isSymbolicLink(dir)) {
Path target = Files.readSymbolicLink(dir);
boolean recreateSymlink = isWindows() && !Files.exists(target, LinkOption.NOFOLLOW_LINKS);
Path result = mkdirs(target);
if (recreateSymlink) { // recreate symlink on windows
delete(dir);
createSymbolicLink(dir, target);
}
return result;
}
return Files.createDirectories(dir);
}
public static long drain(InputStream in) throws IOException {
try {
long result = 0L;
byte[] buffer = new byte[BUFFER_SIZE];
for (int size; (size = read(in, buffer, 0, buffer.length)) > 0;) {
result += size;
}
return result;
} finally {
in.close();
}
}
public static OutputStream copy(Collection c, OutputStream out) throws IOException {
PrintWriter pw = writer(out);
try {
for (Object o : c) {
pw.println(o);
}
return out;
} finally {
pw.flush();
}
}
public static Throwable close(AutoCloseable in) {
try {
if (in != null)
in.close();
} catch (Throwable e) {
return e;
}
return null;
}
// This method is required for binary backwards compatibility.
public static Throwable close(Closeable in) {
return close((AutoCloseable) in);
}
/**
* Will iterate over the given toBeClose and silently close any object that
* implements AutoCloseable.
*
* @param toBeClosed any iterable
* @return true if an exception was thrown during closing
*/
public static boolean closeAll(Object... toBeClosed) {
if (toBeClosed == null)
return false;
boolean exceptionsWereThrown = false;
for (Object o : toBeClosed) {
if (o instanceof AutoCloseable) {
exceptionsWereThrown |= close((AutoCloseable) o) != null;
} else if (o instanceof Iterable) {
for (Object oo : (Iterable) o) {
if (oo instanceof AutoCloseable) {
// do not recurse!
exceptionsWereThrown |= close((AutoCloseable) oo) != null;
}
}
}
}
return exceptionsWereThrown;
}
public static URL toURL(String s, File base) throws MalformedURLException {
int n = s.indexOf(':');
if (n > 0 && n < 10) {
// is url
return new URL(s);
}
return getFile(base, s).toURI()
.toURL();
}
public static void store(Object o, File file) throws IOException {
store(o, file.toPath(), UTF_8);
}
public static void store(Object o, File file, String encoding) throws IOException {
store(o, file.toPath(), Charset.forName(encoding));
}
public static void store(Object o, Path path, Charset encoding) throws IOException {
try (FileChannel ch = writeChannel(path)) {
if (o != null) {
try (Writer w = Channels.newWriter(ch, encoding.newEncoder(), -1)) {
w.write(o.toString());
}
}
}
}
public static void store(Object o, OutputStream out) throws IOException {
store(o, out, UTF_8);
}
public static void store(Object o, OutputStream out, String encoding) throws IOException {
store(o, out, Charset.forName(encoding));
}
public static void store(Object o, OutputStream out, Charset encoding) throws IOException {
Writer w = writer(out, encoding);
try {
store(o, w);
} finally {
w.flush();
}
}
public static void store(Object o, Writer w) throws IOException {
if (o != null) {
w.write(o.toString());
}
}
/**
* Store output in a file but ensure that the content is updated atomically.
* To ensure this, the file is first copied to a temporary file in the same
* directory as the target. It is then renamed which will first attempt an
* atomic move but will always replace.
*
* @param store the function provide the output
* @param target the file to store it, parent directories will be created if
* necessary
*/
public static void store(ConsumerWithException store, File target) throws Exception {
target.getParentFile()
.mkdirs();
File tmp = createTempFile(target.getParentFile(), target.getName(), ".tmp");
try {
try (OutputStream outputStream = outputStream(tmp)) {
store.accept(outputStream);
}
rename(tmp, target);
assert target.isFile();
} finally {
if (tmp.exists())
tmp.delete();
}
}
public static InputStream stream(byte[] data) {
return stream(ByteBuffer.wrap(data));
}
public static InputStream stream(ByteBuffer bb) {
return new ByteBufferInputStream(bb);
}
public static InputStream stream(String s) {
return stream(s, UTF_8);
}
public static InputStream stream(String s, String encoding) {
return stream(s, Charset.forName(encoding));
}
public static InputStream stream(String s, Charset encoding) {
return stream(s.getBytes(encoding));
}
public static InputStream stream(File file) throws IOException {
return stream(file.toPath());
}
public static InputStream stream(Path path) throws IOException {
return Files.newInputStream(path);
}
public static InputStream stream(URL url) throws IOException {
return url.openStream();
}
public static FileChannel readChannel(Path path) throws IOException {
return FileChannel.open(path, readOptions);
}
public static OutputStream outputStream(File file) throws IOException {
return outputStream(file.toPath());
}
public static OutputStream outputStream(Path path) throws IOException {
return Files.newOutputStream(path);
}
public static FileChannel writeChannel(Path path) throws IOException {
return FileChannel.open(path, writeOptions);
}
public static CharBuffer decode(ByteBuffer bb, Charset encoding) {
return encoding.decode(bb);
}
public static ByteBuffer encode(CharBuffer cb, Charset encoding) {
return encoding.encode(cb);
}
public static ByteBuffer encode(String s, Charset encoding) {
return encoding.encode(s);
}
public static BufferedReader reader(String s) {
return new BufferedReader(new StringReader(s));
}
public static BufferedReader reader(File file) throws IOException {
return reader(file.toPath(), UTF_8);
}
public static BufferedReader reader(File file, String encoding) throws IOException {
return reader(file.toPath(), Charset.forName(encoding));
}
public static BufferedReader reader(File file, Charset encoding) throws IOException {
return reader(file.toPath(), encoding);
}
public static BufferedReader reader(Path path, Charset encoding) throws IOException {
return reader(readChannel(path), encoding);
}
public static BufferedReader reader(ByteBuffer bb, Charset encoding) {
return reader(new ByteBufferInputStream(bb), encoding);
}
public static BufferedReader reader(CharBuffer cb) {
return new BufferedReader(new CharBufferReader(cb));
}
public static BufferedReader reader(ReadableByteChannel in, Charset encoding) {
return new BufferedReader(Channels.newReader(in, encoding.newDecoder(), -1));
}
public static BufferedReader reader(InputStream in) {
return reader(in, UTF_8);
}
public static BufferedReader reader(InputStream in, String encoding) {
return reader(in, Charset.forName(encoding));
}
public static BufferedReader reader(InputStream in, Charset encoding) {
return new BufferedReader(new InputStreamReader(in, encoding));
}
public static PrintWriter writer(File file) throws IOException {
return writer(file.toPath(), UTF_8);
}
public static PrintWriter writer(File file, String encoding) throws IOException {
return writer(file.toPath(), Charset.forName(encoding));
}
public static PrintWriter writer(File file, Charset encoding) throws IOException {
return writer(file.toPath(), encoding);
}
public static PrintWriter writer(Path path) throws IOException {
return writer(path, UTF_8);
}
public static PrintWriter writer(Path path, Charset encoding) throws IOException {
return writer(writeChannel(path), encoding);
}
public static PrintWriter writer(WritableByteChannel out, Charset encoding) {
return new PrintWriter(Channels.newWriter(out, encoding.newEncoder(), -1));
}
public static PrintWriter writer(OutputStream out) {
return writer(out, UTF_8);
}
public static PrintWriter writer(OutputStream out, String encoding) {
return writer(out, Charset.forName(encoding));
}
public static PrintWriter writer(OutputStream out, Charset encoding) {
return new PrintWriter(new OutputStreamWriter(out, encoding));
}
static final class AppendableWriterAdapter extends Writer {
private final Appendable appendable;
AppendableWriterAdapter(Appendable appendable) {
super(appendable);
this.appendable = appendable;
}
@Override
public void write(int c) throws IOException {
synchronized (lock) {
appendable.append((char) c);
}
}
private static void validate(int length, int offset, int count) {
if (offset < 0) {
throw new IndexOutOfBoundsException("offset less than zero");
}
if (count < 0) {
throw new IndexOutOfBoundsException("count less than zero");
}
if (offset > length - count) {
throw new IndexOutOfBoundsException("offset+count greater than input length");
}
}
@Override
public void write(char[] cbuf, int off, int len) throws IOException {
validate(cbuf.length, off, len);
synchronized (lock) {
for (int i = off, end = off + len; i < end; i++) {
appendable.append(cbuf[i]);
}
}
}
@Override
public void write(String str) throws IOException {
requireNonNull(str);
synchronized (lock) {
appendable.append(str);
}
}
@Override
public void write(String str, int off, int len) throws IOException {
validate(str.length(), off, len);
synchronized (lock) {
appendable.append(str, off, off + len);
}
}
@Override
public Writer append(char c) throws IOException {
synchronized (lock) {
appendable.append(c);
}
return this;
}
@Override
public Writer append(CharSequence csq) throws IOException {
if (csq == null) {
csq = "null";
}
synchronized (lock) {
appendable.append(csq);
}
return this;
}
@Override
public Writer append(CharSequence csq, int start, int end) throws IOException {
if (csq == null) {
csq = "null";
}
validate(csq.length(), start, end - start);
synchronized (lock) {
appendable.append(csq, start, end);
}
return this;
}
@Override
public void flush() throws IOException {
synchronized (lock) {
if (appendable instanceof Flushable) {
((Flushable) appendable).flush();
}
}
}
@Override
public void close() throws IOException {
synchronized (lock) {
flush();
if (appendable instanceof Closeable) {
((Closeable) appendable).close();
}
}
}
}
public static Writer appendableToWriter(Appendable appendable) {
return new AppendableWriterAdapter(appendable);
}
public static boolean createSymbolicLink(File link, File target) throws IOException {
return createSymbolicLink(link.toPath(), target.toPath());
}
public static boolean createSymbolicLink(Path link, Path target) throws IOException {
if (isSymbolicLink(link)) {
Path linkTarget = Files.readSymbolicLink(link);
if (target.equals(linkTarget)) {
return true;
} else {
Files.delete(link);
}
}
try {
Files.createSymbolicLink(link, target);
return true;
} catch (Exception e) {
// ignore
}
return false;
}
public static boolean isSymbolicLink(File link) {
return isSymbolicLink(link.toPath());
}
public static boolean isSymbolicLink(Path link) {
return Files.isSymbolicLink(link);
}
/**
* Creates a symbolic link from {@code link} to the {@code target}, or
* copies {@code target} to {@code link} if running on Windows.
*
* Creating symbolic links on Windows requires administrator permissions, so
* copying is a safer fallback. Copy only happens if timestamp and and file
* length are different than target
*
* @param link the location of the symbolic link, or destination of the
* copy.
* @param target the source of the symbolic link, or source of the copy.
* @return {@code true} if the operation succeeds, {@code false} otherwise.
*/
public static boolean createSymbolicLinkOrCopy(File link, File target) {
return createSymbolicLinkOrCopy(link.toPath(), target.toPath());
}
/**
* Creates a symbolic link from {@code link} to the {@code target}, or
* copies {@code target} to {@code link} if running on Windows.
*
* Creating symbolic links on Windows requires administrator permissions, so
* copying is a safer fallback. Copy only happens if timestamp and and file
* length are different than target
*
* @param link the location of the symbolic link, or destination of the
* copy.
* @param target the source of the symbolic link, or source of the copy.
* @return {@code true} if the operation succeeds, {@code false} otherwise.
*/
public static boolean createSymbolicLinkOrCopy(Path link, Path target) {
try {
if (isWindows || !createSymbolicLink(link, target)) {
// only copy if target length and timestamp differ
BasicFileAttributes targetAttrs = Files.readAttributes(target, BasicFileAttributes.class);
try {
BasicFileAttributes linkAttrs = Files.readAttributes(link, BasicFileAttributes.class);
if (targetAttrs.lastModifiedTime()
.equals(linkAttrs.lastModifiedTime()) && targetAttrs.size() == linkAttrs.size()) {
return true;
}
} catch (IOException e) {
// link does not exist
}
copy(target, link);
Files.setLastModifiedTime(link, targetAttrs.lastModifiedTime());
}
return true;
} catch (Exception ignore) {
// ignore
}
return false;
}
static final public OutputStream nullStream = //
new OutputStream() {
@Override
public void write(int var0) {}
@Override
public void write(byte[] var0) {}
@Override
public void write(byte[] var0, int from, int l) {}
@Override
public void close() {}
@Override
public void flush() {}
};
static final public Writer nullWriter = //
new Writer() {
@Override
public Writer append(char var0) {
return this;
}
@Override
public Writer append(CharSequence var0) {
return this;
}
@Override
public Writer append(CharSequence var0, int var1, int var2) {
return this;
}
@Override
public void write(int var0) {}
@Override
public void write(String var0) {}
@Override
public void write(String var0, int var1, int var2) {}
@Override
public void write(char[] var0) {}
@Override
public void write(char[] var0, int var1, int var2) {}
@Override
public void close() {}
@Override
public void flush() {}
};
public static String toSafeFileName(String string) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < string.length(); i++) {
char c = string.charAt(i);
if (c < ' ')
continue;
if (isWindows) {
switch (c) {
case '<' :
case '>' :
case '"' :
case '/' :
case '\\' :
case '|' :
case '*' :
case ':' :
sb.append('%');
break;
default :
sb.append(c);
}
} else {
switch (c) {
case ':' :
case '/' :
sb.append('%');
break;
default :
sb.append(c);
}
}
}
if (sb.length() == 0 || (isWindows && RESERVED_WINDOWS_P.matcher(sb)
.matches()))
sb.append("_");
return sb.toString();
}
private final static Pattern RESERVED_WINDOWS_P = Pattern.compile("CON|PRN|AUX|NUL|COM[1-9]|LPT[1-9]");
public static boolean isWindows() {
return isWindows;
}
/*
* This class calculates the home path. This class uses environment
* variables so that makes it hard to test. For this reason tests can
* override the #getenv method.
*/
static class EnvironmentCalculator {
private boolean iswindows;
public EnvironmentCalculator(boolean iswindows) {
this.iswindows = iswindows;
}
/**
* Get the value of a system environment variable. Expand any macros
* (%...%) if run on windows. Generally, on Linux et. al. environment
* variables are already expanded.
*
* @param key the environment variable name
* @return the value with expanded macros if on windows.
*/
String getSystemEnv(String key) {
return getSystemEnv(key, null);
}
private String getSystemEnv(String key, Set visited) {
String value = getenv(key);
if (value == null || !iswindows) {
return value;
}
if (visited == null) {
visited = new HashSet<>();
}
if (!visited.add(key)) {
return key;
}
StringBuilder sb = new StringBuilder();
Matcher matcher = WINDOWS_MACROS.matcher(value);
int start = 0;
for (; matcher.find(); start = matcher.end()) {
String name = matcher.group(1);
String replacement = getSystemEnv(name, visited);
sb.append(value, start, matcher.start())
.append(replacement);
}
return (start == 0) ? value
: sb.append(value, start, value.length())
.toString();
}
String getenv(String key) {
return System.getenv(key);
}
File getHome() {
File home = testFile(getSystemEnv("HOME"));
if ((home == null) || !home.isDirectory()) {
home = testFile(System.getProperty("user.home"));
}
assert home != null;
return home;
}
File getJavaHome() {
File javaHome = testFile(getSystemEnv("JAVA_HOME"));
if ((javaHome == null) || !javaHome.isDirectory()) {
javaHome = testFile(System.getProperty("java.home"));
}
assert javaHome != null;
return javaHome;
}
private File testFile(String path) {
if (path == null)
return null;
return new File(path);
}
}
public static String readUTF(DataInput in) throws IOException {
int size = in.readUnsignedShort();
char[] string = new char[size];
int len = 0;
for (int i = 0; i < size; i++, len++) {
int b = in.readUnsignedByte();
if ((b > 0x00) && (b < 0x80)) {
string[len] = (char) b;
} else {
switch (b >> 4) {
// 2 byte encoding
case 0b1100 :
case 0b1101 : {
i++;
if (i >= size) {
throw new UTFDataFormatException("partial multi byte charater at end");
}
int b2 = in.readUnsignedByte();
if ((b2 & 0b1100_0000) != 0b1000_0000) {
throw new UTFDataFormatException("bad encoding at byte: " + (i - 1));
}
string[len] = (char) (((b & 0x1F) << 6) | (b2 & 0x3F));
break;
}
// 3 byte encoding
case 0b1110 : {
i += 2;
if (i >= size) {
throw new UTFDataFormatException("partial multi byte charater at end");
}
int b2 = in.readUnsignedByte();
int b3 = in.readUnsignedByte();
if (((b2 & 0b1100_0000) != 0b1000_0000) || ((b3 & 0b1100_0000) != 0b1000_0000)) {
throw new UTFDataFormatException("bad encoding at byte: " + (i - 2));
}
string[len] = (char) (((b & 0x0F) << 12) | ((b2 & 0x3F) << 6) | (b3 & 0x3F));
break;
}
// invalid encoding
default : {
throw new UTFDataFormatException("bad encoding at byte: " + i);
}
}
}
}
return new String(string, 0, len);
}
public static String getJavaExecutablePath(String name) {
Path java_home = JAVA_HOME.toPath();
Path command = Paths.get("bin", name);
Path executable = java_home.resolve(command);
if (Files.exists(executable)) {
return absolutePath(executable);
}
if (java_home.endsWith("jre")) {
executable = java_home.getParent()
.resolve(command);
if (Files.exists(executable)) {
return absolutePath(executable);
}
}
return name;
}
}