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/*
* Copyright (c) 2013, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.test.lib;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.FilenameFilter;
import java.io.IOException;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.MalformedURLException;
import java.net.ServerSocket;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.nio.file.CopyOption;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.AclEntry;
import java.nio.file.attribute.AclEntryType;
import java.nio.file.attribute.AclFileAttributeView;
import java.nio.file.attribute.FileAttribute;
import java.nio.channels.SocketChannel;
import java.nio.file.attribute.PosixFilePermissions;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HexFormat;
import java.util.Iterator;
import java.util.Map;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Random;
import java.util.Set;
import java.util.function.BooleanSupplier;
import java.util.concurrent.TimeUnit;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import static jdk.test.lib.Asserts.assertTrue;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
/**
* Common library for various test helper functions.
*/
public final class Utils {
/**
* Returns the value of 'test.class.path' system property.
*/
public static final String TEST_CLASS_PATH = System.getProperty("test.class.path", ".");
/**
* Returns the sequence used by operating system to separate lines.
*/
public static final String NEW_LINE = System.getProperty("line.separator");
/**
* Returns the value of 'test.vm.opts' system property.
*/
public static final String VM_OPTIONS = System.getProperty("test.vm.opts", "").trim();
/**
* Returns the value of 'test.java.opts' system property.
*/
public static final String JAVA_OPTIONS = System.getProperty("test.java.opts", "").trim();
/**
* Returns the value of 'test.src' system property.
*/
public static final String TEST_SRC = System.getProperty("test.src", "").trim();
/**
* Returns the value of 'test.root' system property.
*/
public static final String TEST_ROOT = System.getProperty("test.root", "").trim();
/*
* Returns the value of 'test.jdk' system property
*/
public static final String TEST_JDK = System.getProperty("test.jdk");
/*
* Returns the value of 'compile.jdk' system property
*/
public static final String COMPILE_JDK = System.getProperty("compile.jdk", TEST_JDK);
/**
* Returns the value of 'test.classes' system property
*/
public static final String TEST_CLASSES = System.getProperty("test.classes", ".");
/**
* Returns the value of 'test.name' system property
*/
public static final String TEST_NAME = System.getProperty("test.name", ".");
/**
* Returns the value of 'test.nativepath' system property
*/
public static final String TEST_NATIVE_PATH = System.getProperty("test.nativepath", ".");
/**
* Defines property name for seed value.
*/
public static final String SEED_PROPERTY_NAME = "jdk.test.lib.random.seed";
/**
* Returns the value of 'file.separator' system property
*/
public static final String FILE_SEPARATOR = System.getProperty("file.separator");
/**
* Random generator with predefined seed.
*/
private static volatile Random RANDOM_GENERATOR;
/**
* Maximum number of attempts to get free socket
*/
private static final int MAX_SOCKET_TRIES = 10;
/**
* Contains the seed value used for {@link java.util.Random} creation.
*/
public static final long SEED;
static {
var seed = Long.getLong(SEED_PROPERTY_NAME);
if (seed != null) {
// use explicitly set seed
SEED = seed;
} else {
var v = Runtime.version();
// promotable builds have build number, and it's greater than 0
if (v.build().orElse(0) > 0) {
// promotable build -> use 1st 8 bytes of md5($version)
try {
var md = MessageDigest.getInstance("MD5");
var bytes = v.toString()
.getBytes(StandardCharsets.UTF_8);
bytes = md.digest(bytes);
SEED = ByteBuffer.wrap(bytes).getLong();
} catch (NoSuchAlgorithmException e) {
throw new Error(e);
}
} else {
// "personal" build -> use random seed
SEED = new Random().nextLong();
}
}
}
/**
* Returns the value of 'test.timeout.factor' system property
* converted to {@code double}.
*/
public static final double TIMEOUT_FACTOR;
static {
String toFactor = System.getProperty("test.timeout.factor", "1.0");
TIMEOUT_FACTOR = Double.parseDouble(toFactor);
}
/**
* Returns the value of JTREG default test timeout in milliseconds
* converted to {@code long}.
*/
public static final long DEFAULT_TEST_TIMEOUT = TimeUnit.SECONDS.toMillis(120);
private Utils() {
// Private constructor to prevent class instantiation
}
/**
* Returns the list of VM options with -J prefix.
*
* @return The list of VM options with -J prefix
*/
public static List<String> getForwardVmOptions() {
String[] opts = safeSplitString(VM_OPTIONS);
for (int i = 0; i < opts.length; i++) {
opts[i] = "-J" + opts[i];
}
return Arrays.asList(opts);
}
/**
* Returns the default JTReg arguments for a jvm running a test.
* This is the combination of JTReg arguments test.vm.opts and test.java.opts.
* @return An array of options, or an empty array if no options.
*/
public static String[] getTestJavaOpts() {
List<String> opts = new ArrayList<String>();
Collections.addAll(opts, safeSplitString(VM_OPTIONS));
Collections.addAll(opts, safeSplitString(JAVA_OPTIONS));
return opts.toArray(new String[0]);
}
/**
* Combines given arguments with default JTReg arguments for a jvm running a test.
* This is the combination of JTReg arguments test.vm.opts and test.java.opts
* @return The combination of JTReg test java options and user args.
*/
public static String[] prependTestJavaOpts(String... userArgs) {
List<String> opts = new ArrayList<String>();
Collections.addAll(opts, getTestJavaOpts());
Collections.addAll(opts, userArgs);
return opts.toArray(new String[0]);
}
/**
* Combines given arguments with default JTReg arguments for a jvm running a test.
* This is the combination of JTReg arguments test.vm.opts and test.java.opts
* @return The combination of JTReg test java options and user args.
*/
public static String[] appendTestJavaOpts(String... userArgs) {
List<String> opts = new ArrayList<String>();
Collections.addAll(opts, userArgs);
Collections.addAll(opts, getTestJavaOpts());
return opts.toArray(new String[0]);
}
/**
* Combines given arguments with default JTReg arguments for a jvm running a test.
* This is the combination of JTReg arguments test.vm.opts and test.java.opts
* @return The combination of JTReg test java options and user args.
*/
public static String[] addTestJavaOpts(String... userArgs) {
return prependTestJavaOpts(userArgs);
}
private static final Pattern useGcPattern = Pattern.compile(
"(?:\\-XX\\:[\\+\\-]Use.+GC)");
/**
* Removes any options specifying which GC to use, for example "-XX:+UseG1GC".
* Removes any options matching: -XX:(+/-)Use*GC
* Used when a test need to set its own GC version. Then any
* GC specified by the framework must first be removed.
* @return A copy of given opts with all GC options removed.
*/
public static List<String> removeGcOpts(List<String> opts) {
List<String> optsWithoutGC = new ArrayList<String>();
for (String opt : opts) {
if (useGcPattern.matcher(opt).matches()) {
System.out.println("removeGcOpts: removed " + opt);
} else {
optsWithoutGC.add(opt);
}
}
return optsWithoutGC;
}
/**
* Returns the default JTReg arguments for a jvm running a test without
* options that matches regular expressions in {@code filters}.
* This is the combination of JTReg arguments test.vm.opts and test.java.opts.
* @param filters Regular expressions used to filter out options.
* @return An array of options, or an empty array if no options.
*/
public static String[] getFilteredTestJavaOpts(String... filters) {
String options[] = getTestJavaOpts();
if (filters.length == 0) {
return options;
}
List<String> filteredOptions = new ArrayList<String>(options.length);
Pattern patterns[] = new Pattern[filters.length];
for (int i = 0; i < filters.length; i++) {
patterns[i] = Pattern.compile(filters[i]);
}
for (String option : options) {
boolean matched = false;
for (int i = 0; i < patterns.length && !matched; i++) {
Matcher matcher = patterns[i].matcher(option);
matched = matcher.find();
}
if (!matched) {
filteredOptions.add(option);
}
}
return filteredOptions.toArray(new String[filteredOptions.size()]);
}
/**
* Splits a string by white space.
* Works like String.split(), but returns an empty array
* if the string is null or empty.
*/
private static String[] safeSplitString(String s) {
if (s == null || s.trim().isEmpty()) {
return new String[] {};
}
return s.trim().split("\\s+");
}
/**
* @return The full command line for the ProcessBuilder.
*/
public static String getCommandLine(ProcessBuilder pb) {
StringBuilder cmd = new StringBuilder();
for (String s : pb.command()) {
cmd.append(s).append(" ");
}
return cmd.toString();
}
/**
* Returns the socket address of an endpoint that refuses connections. The
* endpoint is an InetSocketAddress where the address is the loopback address
* and the port is a system port (1-1023 range).
* This method is a better choice than getFreePort for tests that need
* an endpoint that refuses connections.
*/
public static InetSocketAddress refusingEndpoint() {
InetAddress lb = InetAddress.getLoopbackAddress();
int port = 1;
while (port < 1024) {
InetSocketAddress sa = new InetSocketAddress(lb, port);
try {
SocketChannel.open(sa).close();
} catch (IOException ioe) {
return sa;
}
port++;
}
throw new RuntimeException("Unable to find system port that is refusing connections");
}
/**
* Returns local addresses with symbolic and numeric scopes
*/
public static List<InetAddress> getAddressesWithSymbolicAndNumericScopes() {
List<InetAddress> result = new LinkedList<>();
try {
NetworkConfiguration conf = NetworkConfiguration.probe();
conf.ip4Addresses().forEach(result::add);
// Java reports link local addresses with symbolic scope,
// but on Windows java.net.NetworkInterface generates its own scope names
// which are incompatible with native Windows routines.
// So on Windows test only addresses with numeric scope.
// On other platforms test both symbolic and numeric scopes.
conf.ip6Addresses()
// test only IPv6 loopback and link-local addresses (JDK-8224775)
.filter(addr -> addr.isLinkLocalAddress() || addr.isLoopbackAddress())
.forEach(addr6 -> {
try {
result.add(Inet6Address.getByAddress(null, addr6.getAddress(), addr6.getScopeId()));
} catch (UnknownHostException e) {
// cannot happen!
throw new RuntimeException("Unexpected", e);
}
if (!Platform.isWindows()) {
result.add(addr6);
}
});
} catch (IOException e) {
// cannot happen!
throw new RuntimeException("Unexpected", e);
}
return result;
}
/**
* Returns the free port on the loopback address.
*
* @return The port number
* @throws IOException if an I/O error occurs when opening the socket
*/
public static int getFreePort() throws IOException {
try (ServerSocket serverSocket =
new ServerSocket(0, 5, InetAddress.getLoopbackAddress());) {
return serverSocket.getLocalPort();
}
}
/**
* Returns the free unreserved port on the local host.
*
* @param reservedPorts reserved ports
* @return The port number or -1 if failed to find a free port
*/
public static int findUnreservedFreePort(int... reservedPorts) {
int numTries = 0;
while (numTries++ < MAX_SOCKET_TRIES) {
int port = -1;
try {
port = getFreePort();
} catch (IOException e) {
e.printStackTrace();
}
if (port > 0 && !isReserved(port, reservedPorts)) {
return port;
}
}
return -1;
}
private static boolean isReserved(int port, int[] reservedPorts) {
for (int p : reservedPorts) {
if (p == port) {
return true;
}
}
return false;
}
/**
* Returns the name of the local host.
*
* @return The host name
* @throws UnknownHostException if IP address of a host could not be determined
*/
public static String getHostname() throws UnknownHostException {
InetAddress inetAddress = InetAddress.getLocalHost();
String hostName = inetAddress.getHostName();
assertTrue((hostName != null && !hostName.isEmpty()),
"Cannot get hostname");
return hostName;
}
/**
* Adjusts the provided timeout value for the TIMEOUT_FACTOR
* @param tOut the timeout value to be adjusted
* @return The timeout value adjusted for the value of "test.timeout.factor"
* system property
*/
public static long adjustTimeout(long tOut) {
return Math.round(tOut * Utils.TIMEOUT_FACTOR);
}
/**
* Return the contents of the named file as a single String,
* or null if not found.
* @param filename name of the file to read
* @return String contents of file, or null if file not found.
* @throws IOException
* if an I/O error occurs reading from the file or a malformed or
* unmappable byte sequence is read
*/
public static String fileAsString(String filename) throws IOException {
Path filePath = Paths.get(filename);
if (!Files.exists(filePath)) return null;
return new String(Files.readAllBytes(filePath));
}
/**
* Returns hex view of byte array
*
* @param bytes byte array to process
* @return space separated hexadecimal string representation of bytes
* @deprecated replaced by {@link java.util.HexFormat#ofDelimiter(String)
* HexFormat.ofDelimiter(" ").format (byte[], char)}.
*/
@Deprecated
public static String toHexString(byte[] bytes) {
return HexFormat.ofDelimiter(" ").withUpperCase().formatHex(bytes);
}
/**
* Returns byte array of hex view
*
* @param hex hexadecimal string representation
* @return byte array
*/
public static byte[] toByteArray(String hex) {
return HexFormat.of().parseHex(hex);
}
/**
* Returns {@link java.util.Random} generator initialized with particular seed.
* The seed could be provided via system property {@link Utils#SEED_PROPERTY_NAME}.
* In case no seed is provided and the build under test is "promotable"
* (its build number ({@code $BUILD} in {@link Runtime.Version}) is greater than 0,
* the seed based on string representation of {@link Runtime#version()} is used.
* Otherwise, the seed is randomly generated.
* The used seed printed to stdout.
* The printing is not in the synchronized block so as to prevent carrier threads starvation.
* @return {@link java.util.Random} generator with particular seed.
*/
public static Random getRandomInstance() {
if (RANDOM_GENERATOR == null) {
synchronized (Utils.class) {
if (RANDOM_GENERATOR == null) {
RANDOM_GENERATOR = new Random(SEED);
} else {
return RANDOM_GENERATOR;
}
}
System.out.printf("For random generator using seed: %d%n", SEED);
System.out.printf("To re-run test with same seed value please add \"-D%s=%d\" to command line.%n", SEED_PROPERTY_NAME, SEED);
}
return RANDOM_GENERATOR;
}
/**
* Returns random element of non empty collection
*
* @param <T> a type of collection element
* @param collection collection of elements
* @return random element of collection
* @throws IllegalArgumentException if collection is empty
*/
public static <T> T getRandomElement(Collection<T> collection)
throws IllegalArgumentException {
if (collection.isEmpty()) {
throw new IllegalArgumentException("Empty collection");
}
Random random = getRandomInstance();
int elementIndex = 1 + random.nextInt(collection.size() - 1);
Iterator<T> iterator = collection.iterator();
while (--elementIndex != 0) {
iterator.next();
}
return iterator.next();
}
/**
* Returns random element of non empty array
*
* @param <T> a type of array element
* @param array array of elements
* @return random element of array
* @throws IllegalArgumentException if array is empty
*/
public static <T> T getRandomElement(T[] array)
throws IllegalArgumentException {
if (array == null || array.length == 0) {
throw new IllegalArgumentException("Empty or null array");
}
Random random = getRandomInstance();
return array[random.nextInt(array.length)];
}
/**
* Wait for condition to be true
*
* @param condition a condition to wait for
*/
public static final void waitForCondition(BooleanSupplier condition) {
waitForCondition(condition, -1L, 100L);
}
/**
* Wait until timeout for condition to be true
*
* @param condition a condition to wait for
* @param timeout a time in milliseconds to wait for condition to be true
* specifying -1 will wait forever
* @return condition value, to determine if wait was successful
*/
public static final boolean waitForCondition(BooleanSupplier condition,
long timeout) {
return waitForCondition(condition, timeout, 100L);
}
/**
* Wait until timeout for condition to be true for specified time
*
* @param condition a condition to wait for
* @param timeout a time in milliseconds to wait for condition to be true,
* specifying -1 will wait forever
* @param sleepTime a time to sleep value in milliseconds
* @return condition value, to determine if wait was successful
*/
public static final boolean waitForCondition(BooleanSupplier condition,
long timeout, long sleepTime) {
long startTime = System.currentTimeMillis();
while (!(condition.getAsBoolean() || (timeout != -1L
&& ((System.currentTimeMillis() - startTime) > timeout)))) {
try {
Thread.sleep(sleepTime);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new Error(e);
}
}
return condition.getAsBoolean();
}
/**
* Interface same as java.lang.Runnable but with
* method {@code run()} able to throw any Throwable.
*/
public static interface ThrowingRunnable {
void run() throws Throwable;
}
/**
* Filters out an exception that may be thrown by the given
* test according to the given filter.
*
* @param test method that is invoked and checked for exception.
* @param filter function that checks if the thrown exception matches
* criteria given in the filter's implementation.
* @return exception that matches the filter if it has been thrown or
* {@code null} otherwise.
* @throws Throwable if test has thrown an exception that does not
* match the filter.
*/
public static Throwable filterException(ThrowingRunnable test,
Function<Throwable, Boolean> filter) throws Throwable {
try {
test.run();
} catch (Throwable t) {
if (filter.apply(t)) {
return t;
} else {
throw t;
}
}
return null;
}
/**
* Ensures a requested class is loaded
* @param aClass class to load
*/
public static void ensureClassIsLoaded(Class<?> aClass) {
if (aClass == null) {
throw new Error("Requested null class");
}
try {
Class.forName(aClass.getName(), /* initialize = */ true,
ClassLoader.getSystemClassLoader());
} catch (ClassNotFoundException e) {
throw new Error("Class not found", e);
}
}
/**
* @param parent a class loader to be the parent for the returned one
* @return an UrlClassLoader with urls made of the 'test.class.path' jtreg
* property and with the given parent
*/
public static URLClassLoader getTestClassPathURLClassLoader(ClassLoader parent) {
URL[] urls = Arrays.stream(TEST_CLASS_PATH.split(File.pathSeparator))
.map(Paths::get)
.map(Path::toUri)
.map(x -> {
try {
return x.toURL();
} catch (MalformedURLException ex) {
throw new Error("Test issue. JTREG property"
+ " 'test.class.path'"
+ " is not defined correctly", ex);
}
}).toArray(URL[]::new);
return new URLClassLoader(urls, parent);
}
/**
* Runs runnable and checks that it throws expected exception. If exceptionException is null it means
* that we expect no exception to be thrown.
* @param runnable what we run
* @param expectedException expected exception
*/
public static void runAndCheckException(ThrowingRunnable runnable, Class<? extends Throwable> expectedException) {
runAndCheckException(runnable, t -> {
if (t == null) {
if (expectedException != null) {
throw new AssertionError("Didn't get expected exception " + expectedException.getSimpleName());
}
} else {
String message = "Got unexpected exception " + t.getClass().getSimpleName();
if (expectedException == null) {
throw new AssertionError(message, t);
} else if (!expectedException.isAssignableFrom(t.getClass())) {
message += " instead of " + expectedException.getSimpleName();
throw new AssertionError(message, t);
}
}
});
}
/**
* Runs runnable and makes some checks to ensure that it throws expected exception.
* @param runnable what we run
* @param checkException a consumer which checks that we got expected exception and raises a new exception otherwise
*/
public static void runAndCheckException(ThrowingRunnable runnable, Consumer<Throwable> checkException) {
Throwable throwable = null;
try {
runnable.run();
} catch (Throwable t) {
throwable = t;
}
checkException.accept(throwable);
}
/**
* Converts to VM type signature
*
* @param type Java type to convert
* @return string representation of VM type
*/
public static String toJVMTypeSignature(Class<?> type) {
if (type.isPrimitive()) {
if (type == boolean.class) {
return "Z";
} else if (type == byte.class) {
return "B";
} else if (type == char.class) {
return "C";
} else if (type == double.class) {
return "D";
} else if (type == float.class) {
return "F";
} else if (type == int.class) {
return "I";
} else if (type == long.class) {
return "J";
} else if (type == short.class) {
return "S";
} else if (type == void.class) {
return "V";
} else {
throw new Error("Unsupported type: " + type);
}
}
String result = type.getName().replaceAll("\\.", "/");
if (!type.isArray()) {
return "L" + result + ";";
}
return result;
}
public static Object[] getNullValues(Class<?>... types) {
Object[] result = new Object[types.length];
int i = 0;
for (Class<?> type : types) {
result[i++] = NULL_VALUES.get(type);
}
return result;
}
private static Map<Class<?>, Object> NULL_VALUES = new HashMap<>();
static {
NULL_VALUES.put(boolean.class, false);
NULL_VALUES.put(byte.class, (byte) 0);
NULL_VALUES.put(short.class, (short) 0);
NULL_VALUES.put(char.class, '\0');
NULL_VALUES.put(int.class, 0);
NULL_VALUES.put(long.class, 0L);
NULL_VALUES.put(float.class, 0.0f);
NULL_VALUES.put(double.class, 0.0d);
}
/*
* Run uname with specified arguments.
*/
public static OutputAnalyzer uname(String... args) throws Throwable {
String[] cmds = new String[args.length + 1];
cmds[0] = "uname";
System.arraycopy(args, 0, cmds, 1, args.length);
return ProcessTools.executeCommand(cmds);
}
/**
* Creates an empty file in "user.dir" if the property set.
* <p>
* This method is meant as a replacement for {@link Files#createTempFile(String, String, FileAttribute...)}
* that doesn't leave files behind in /tmp directory of the test machine
* <p>
* If the property "user.dir" is not set, "." will be used.
*
* @param prefix the prefix string to be used in generating the file's name;
* may be null
* @param suffix the suffix string to be used in generating the file's name;
* may be null, in which case ".tmp" is used
* @param attrs an optional list of file attributes to set atomically when creating the file
* @return the path to the newly created file that did not exist before this
* method was invoked
* @throws IOException if an I/O error occurs or dir does not exist
*
* @see Files#createTempFile(String, String, FileAttribute...)
*/
public static Path createTempFile(String prefix, String suffix, FileAttribute<?>... attrs) throws IOException {
Path dir = Paths.get(System.getProperty("user.dir", "."));
return Files.createTempFile(dir, prefix, suffix, attrs);
}
/**
* Creates an empty directory in "user.dir" or "."
* <p>
* This method is meant as a replacement for {@link Files#createTempDirectory(Path, String, FileAttribute...)}
* that doesn't leave files behind in /tmp directory of the test machine
* <p>
* If the property "user.dir" is not set, "." will be used.
*
* @param prefix the prefix string to be used in generating the directory's name; may be null
* @param attrs an optional list of file attributes to set atomically when creating the directory
* @return the path to the newly created directory
* @throws IOException if an I/O error occurs or dir does not exist
*
* @see Files#createTempDirectory(Path, String, FileAttribute...)
*/
public static Path createTempDirectory(String prefix, FileAttribute<?>... attrs) throws IOException {
Path dir = Paths.get(System.getProperty("user.dir", "."));
return Files.createTempDirectory(dir, prefix, attrs);
}
/**
* Converts slashes in a pathname to backslashes
* if slashes is not the file separator.
*/
public static String convertPath(String path) {
// No need to do the conversion if file separator is '/'
if (FILE_SEPARATOR.length() == 1 && FILE_SEPARATOR.charAt(0) == '/') {
return path;
}
char[] cs = path.toCharArray();
for (int i = 0; i < cs.length; i++) {
if (cs[i] == '/') {
cs[i] = '\\';
}
}
String newPath = new String(cs);
return newPath;
}
/**
* Return file directories that satisfy the specified filter.
*
* @param searchDirectory the base directory to search
* @param filter a filename filter
* @return file directories
*/
public static List<Path> findFiles(Path searchDirectory,
FilenameFilter filter) {
return Arrays.stream(searchDirectory.toFile().listFiles(filter))
.map(f -> f.toPath())
.collect(Collectors.toList());
}
/**
* Copy files to the target path.
*
* @param source the paths to the files to copy
* @param target the path to the target files
* @param filenameMapper mapper function applied to filenames
* @param options options specifying how the copy should be done
* @return the paths to the target files
* @throws IOException if error occurs
*/
public static List<Path> copyFiles(List<Path> source, Path target,
Function<String, String> filenameMapper,
CopyOption... options) throws IOException {
List<Path> result = new ArrayList<>();
if (!target.toFile().exists()) {
Files.createDirectory(target);
}
for (Path file : source) {
if (!file.toFile().exists()) {
continue;
}
String baseName = file.getFileName().toString();
Path targetFile = target.resolve(filenameMapper.apply(baseName));
Files.copy(file, targetFile, options);
result.add(targetFile);
}
return result;
}
/**
* Copy files to the target path.
*
* @param source the paths to the files to copy
* @param target the path to the target files
* @param options options specifying how the copy should be done
* @return the paths to the target files
* @throws IOException if error occurs
*/
public static List<Path> copyFiles(List<Path> source, Path target,
CopyOption... options) throws IOException {
return copyFiles(source, target, (s) -> s, options);
}
/**
* Replace file string by applying the given mapper function.
*
* @param source the file to read
* @param contentMapper the mapper function applied to file's content
* @throws IOException if an I/O error occurs
*/
public static void replaceFileString(Path source,
Function<String, String> contentMapper) throws IOException {
StringBuilder sb = new StringBuilder();
String lineSep = System.getProperty("line.separator");
try (BufferedReader reader =
new BufferedReader(new FileReader(source.toFile()))) {
String line;
// read all and replace all at once??
while ((line = reader.readLine()) != null) {
sb.append(contentMapper.apply(line))
.append(lineSep);
}
}
try (FileWriter writer = new FileWriter(source.toFile())) {
writer.write(sb.toString());
}
}
/**
* Replace files' string by applying the given mapper function.
*
* @param source the file to read
* @param contentMapper the mapper function applied to files' content
* @throws IOException if an I/O error occurs
*/
public static void replaceFilesString(List<Path> source,
Function<String, String> contentMapper) throws IOException {
for (Path file : source) {
replaceFileString(file, contentMapper);
}
}
/**
* Grant file user access or full access to everyone.
*
* @param file file to grant access
* @param userOnly true for user access, otherwise full access to everyone
* @throws IOException if error occurs
*/
public static void grantFileAccess(Path file, boolean userOnly)
throws IOException {
Set<String> attr = file.getFileSystem().supportedFileAttributeViews();
if (attr.contains("posix")) {
String perms = userOnly ? "rwx------" : "rwxrwxrwx";
Files.setPosixFilePermissions(file, PosixFilePermissions.fromString(perms));
} else if (attr.contains("acl")) {
AclFileAttributeView view =
Files.getFileAttributeView(file, AclFileAttributeView.class);
List<AclEntry> acl = new ArrayList<>();
for (AclEntry thisEntry : view.getAcl()) {
if (userOnly) {
if (thisEntry.principal().getName()
.equals(view.getOwner().getName())) {
acl.add(allowAccess(thisEntry));
} else if (thisEntry.type() == AclEntryType.ALLOW) {
acl.add(revokeAccess(thisEntry));
} else {
acl.add(thisEntry);
}
} else {
if (thisEntry.type() != AclEntryType.ALLOW) {
acl.add(allowAccess(thisEntry));
} else {
acl.add(thisEntry);
}
}
}
view.setAcl(acl);
} else {
throw new RuntimeException("Unsupported file attributes: " + attr);
}
}
/**
* Return an ACL entry that revokes owner access.
*
* @param acl original ACL entry to build from
* @return an ACL entry that revokes all access
*/
public static AclEntry revokeAccess(AclEntry acl) {
return buildAclEntry(acl, AclEntryType.DENY);
}
/**
* Return an ACL entry that allow owner access.
* @param acl original ACL entry to build from
* @return an ACL entry that allows all access
*/
public static AclEntry allowAccess(AclEntry acl) {
return buildAclEntry(acl, AclEntryType.ALLOW);
}
/**
* Build an ACL entry with a given ACL entry type.
*
* @param acl original ACL entry to build from
* @return an ACL entry with a given ACL entry type
*/
public static AclEntry buildAclEntry(AclEntry acl, AclEntryType type) {
return AclEntry.newBuilder(acl)
.setType(type)
.build();
}
/**
* Grant file user access.
*
* @param file file to grant access
* @throws IOException if error occurs
*/
public static void userAccess(Path file) throws IOException {
grantFileAccess(file, true);
}
/**
* Grant file full access to everyone.
*
* @param file file to grant access
* @throws IOException if error occurs
*/
public static void fullAccess(Path file) throws IOException {
grantFileAccess(file, false);
}
}
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