package org.infinispan.commons.util;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.ObjectOutput;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringWriter;
import java.lang.management.LockInfo;
import java.lang.management.ManagementFactory;
import java.lang.management.MonitorInfo;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import java.lang.reflect.Array;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import javax.naming.Context;
import javax.security.auth.Subject;
import org.infinispan.commons.CacheConfigurationException;
import org.infinispan.commons.CacheException;
import org.infinispan.commons.hash.Hash;
import org.infinispan.commons.logging.Log;
import org.infinispan.commons.logging.LogFactory;
import org.infinispan.commons.marshall.Marshaller;
/**
* General utility methods used throughout the Infinispan code base.
*
* @author <a href="brian.stansberry@jboss.com">Brian Stansberry</a>
* @author Galder Zamarreño
* @since 4.0
*/
public final class Util {
private static final boolean IS_ARRAYS_DEBUG = Boolean.getBoolean("infinispan.arrays.debug");
private static final boolean IS_OSGI_CONTEXT;
public static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
public static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
private static final Log log = LogFactory.getLog(Util.class);
private static final Set<Class<?>> BASIC_TYPES;
/**
* Current Java vendor. This variable is later used to differentiate LRU implementations
* for different java vendors.
*/
private static final String javaVendor = SecurityActions.getProperty("java.vendor", "");
static {
boolean osgi = false;
try {
osgi = Util.class.getClassLoader() instanceof org.osgi.framework.BundleReference;
} catch (NoClassDefFoundError ex) {
// Ignore
}
IS_OSGI_CONTEXT = osgi;
BASIC_TYPES = new HashSet<>();
BASIC_TYPES.add(Boolean.class);
BASIC_TYPES.add(Byte.class);
BASIC_TYPES.add(Character.class);
BASIC_TYPES.add(Double.class);
BASIC_TYPES.add(Float.class);
BASIC_TYPES.add(Integer.class);
BASIC_TYPES.add(Long.class);
BASIC_TYPES.add(Short.class);
BASIC_TYPES.add(String.class);
}
/**
* <p>
* Loads the specified class using the passed classloader, or, if it is <code>null</code> the Infinispan classes'
* classloader.
* </p>
*
* <p>
* If loadtime instrumentation via GenerateInstrumentedClassLoader is used, this class may be loaded by the bootstrap
* classloader.
* </p>
* <p>
* If the class is not found, the {@link ClassNotFoundException} or {@link NoClassDefFoundError} is wrapped as a
* {@link CacheConfigurationException} and is re-thrown.
* </p>
*
* @param classname name of the class to load
* @param cl the application classloader which should be used to load the class, or null if the class is always packaged with
* Infinispan
* @return the class
* @throws CacheConfigurationException if the class cannot be loaded
*/
public static <T> Class<T> loadClass(String classname, ClassLoader cl) {
try {
return loadClassStrict(classname, cl);
} catch (ClassNotFoundException e) {
throw new CacheConfigurationException("Unable to instantiate class " + classname, e);
}
}
/**
* Tries to determine if the code is running in an OSGi context.
*
* @return true if an OSGi context is detected
*/
public static boolean isOSGiContext() {
return IS_OSGI_CONTEXT;
}
public static ClassLoader[] getClassLoaders(ClassLoader appClassLoader) {
if (isOSGiContext()) {
return SecurityActions.getOSGIContextClassLoaders(appClassLoader);
} else {
return SecurityActions.getClassLoaders(appClassLoader);
}
}
/**
* <p>
* Loads the specified class using the passed classloader, or, if it is <code>null</code> the Infinispan classes' classloader.
* </p>
*
* <p>
* If loadtime instrumentation via GenerateInstrumentedClassLoader is used, this class may be loaded by the bootstrap classloader.
* </p>
*
* @param classname name of the class to load
* @return the class
* @param userClassLoader the application classloader which should be used to load the class, or null if the class is always packaged with
* Infinispan
* @throws ClassNotFoundException if the class cannot be loaded
*/
@SuppressWarnings("unchecked")
public static <T> Class<T> loadClassStrict(String classname, ClassLoader userClassLoader) throws ClassNotFoundException {
ClassLoader[] cls = getClassLoaders(userClassLoader);
ClassNotFoundException e = null;
NoClassDefFoundError ne = null;
for (ClassLoader cl : cls) {
if (cl == null)
continue;
try {
return (Class<T>) Class.forName(classname, true, cl);
} catch (ClassNotFoundException ce) {
e = ce;
} catch (NoClassDefFoundError ce) {
ne = ce;
}
}
if (ne != null) {
//Always log the NoClassDefFoundError errors first:
//if one happened they will contain critically useful details.
log.unableToLoadClass(classname, Arrays.toString(cls), ne);
}
if (e != null)
throw e;
else if (ne != null) {
throw new ClassNotFoundException(classname, ne);
}
else
throw new IllegalStateException();
}
public static InputStream getResourceAsStream(String resourcePath, ClassLoader userClassLoader) {
if (resourcePath.startsWith("/")) {
resourcePath = resourcePath.substring(1);
}
InputStream is = null;
for (ClassLoader cl : getClassLoaders(userClassLoader)) {
if (cl != null) {
is = cl.getResourceAsStream(resourcePath);
if (is != null) {
break;
}
}
}
return is;
}
private static Method getFactoryMethod(Class<?> c) {
for (Method m : c.getMethods()) {
if (m.getName().equals("getInstance") && m.getParameterTypes().length == 0 && Modifier.isStatic(m.getModifiers()))
return m;
}
return null;
}
/**
* Instantiates a class by first attempting a static <i>factory method</i> named <tt>getInstance()</tt> on the class
* and then falling back to an empty constructor.
* <p/>
* Any exceptions encountered are wrapped in a {@link CacheConfigurationException} and rethrown.
*
* @param clazz class to instantiate
* @return an instance of the class
*/
public static <T> T getInstance(Class<T> clazz) {
try {
return getInstanceStrict(clazz);
} catch (IllegalAccessException iae) {
throw new CacheConfigurationException("Unable to instantiate class " + clazz.getName(), iae);
} catch (InstantiationException ie) {
throw new CacheConfigurationException("Unable to instantiate class " + clazz.getName(), ie);
}
}
/**
* Similar to {@link #getInstance(Class)} except that exceptions are propagated to the caller.
*
* @param clazz class to instantiate
* @return an instance of the class
* @throws IllegalAccessException
* @throws InstantiationException
*/
@SuppressWarnings("unchecked")
public static <T> T getInstanceStrict(Class<T> clazz) throws IllegalAccessException, InstantiationException {
// first look for a getInstance() constructor
T instance = null;
try {
Method factoryMethod = getFactoryMethod(clazz);
if (factoryMethod != null) instance = (T) factoryMethod.invoke(null);
}
catch (Exception e) {
// no factory method or factory method failed. Try a constructor.
instance = null;
}
if (instance == null) {
instance = clazz.newInstance();
}
return instance;
}
/**
* Instantiates a class based on the class name provided. Instantiation is attempted via an appropriate, static
* factory method named <tt>getInstance()</tt> first, and failing the existence of an appropriate factory, falls
* back to an empty constructor.
* <p />
* Any exceptions encountered loading and instantiating the class is wrapped in a {@link CacheConfigurationException}.
*
* @param classname class to instantiate
* @return an instance of classname
*/
public static <T> T getInstance(String classname, ClassLoader cl) {
if (classname == null) throw new IllegalArgumentException("Cannot load null class!");
Class<T> clazz = loadClass(classname, cl);
return getInstance(clazz);
}
/**
* Similar to {@link #getInstance(String, ClassLoader)} except that exceptions are propagated to the caller.
*
* @param classname class to instantiate
* @return an instance of classname
* @throws ClassNotFoundException
* @throws InstantiationException
* @throws IllegalAccessException
*/
public static <T> T getInstanceStrict(String classname, ClassLoader cl) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
if (classname == null) throw new IllegalArgumentException("Cannot load null class!");
Class<T> clazz = loadClassStrict(classname, cl);
return getInstanceStrict(clazz);
}
/**
* Clones parameter x of type T with a given Marshaller reference;
*
*
* @return a deep clone of an object parameter x
*/
@SuppressWarnings("unchecked")
public static <T> T cloneWithMarshaller(Marshaller marshaller, T x){
if (marshaller == null)
throw new IllegalArgumentException("Cannot use null Marshaller for clone");
byte[] byteBuffer;
try {
byteBuffer = marshaller.objectToByteBuffer(x);
return (T) marshaller.objectFromByteBuffer(byteBuffer);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new CacheException(e);
} catch (Exception e) {
throw new CacheException(e);
}
}
/**
* Prevent instantiation
*/
private Util() {
}
/**
* Null-safe equality test.
*
* @param a first object to compare
* @param b second object to compare
* @return true if the objects are equals or both null, false otherwise.
*/
public static boolean safeEquals(Object a, Object b) {
return (a == b) || (a != null && a.equals(b));
}
public static String prettyPrintTime(long time, TimeUnit unit) {
return prettyPrintTime(unit.toMillis(time));
}
/**
* {@link System#nanoTime()} is less expensive than {@link System#currentTimeMillis()} and better suited
* to measure time intervals. It's NOT suited to know the current time, for example to be compared
* with the time of other nodes.
* @return the value of {@link System#nanoTime()}, but converted in Milliseconds.
*/
public static final long currentMillisFromNanotime() {
return TimeUnit.MILLISECONDS.convert(System.nanoTime(), TimeUnit.NANOSECONDS);
}
/**
* Prints a time for display
*
* @param millis time in millis
* @return the time, represented as millis, seconds, minutes or hours as appropriate, with suffix
*/
public static String prettyPrintTime(long millis) {
if (millis < 1000) return millis + " milliseconds";
NumberFormat nf = NumberFormat.getNumberInstance();
nf.setMaximumFractionDigits(2);
double toPrint = ((double) millis) / 1000;
if (toPrint < 300) {
return nf.format(toPrint) + " seconds";
}
toPrint = toPrint / 60;
if (toPrint < 120) {
return nf.format(toPrint) + " minutes";
}
toPrint = toPrint / 60;
return nf.format(toPrint) + " hours";
}
/**
* Reads the given InputStream fully, closes the stream and returns the result as a byte array.
*
* @param is the stream to read
* @return the read bytes
* @throws java.io.IOException in case of stream read errors
*/
public static byte[] readStream(InputStream is) throws IOException {
try {
ByteArrayOutputStream os = new ByteArrayOutputStream();
byte[] buf = new byte[1024];
int len;
while ((len = is.read(buf)) != -1) {
os.write(buf, 0, len);
}
return os.toByteArray();
} finally {
is.close();
}
}
/**
* Reads the given InputStream fully, closes the stream and returns the result as a String.
*
* @param is the stream to read
* @return the UTF-8 string
* @throws java.io.IOException in case of stream read errors
*/
public static String read(InputStream is) throws IOException {
try {
final Reader reader = new InputStreamReader(is, "UTF-8");
StringWriter writer = new StringWriter();
char[] buf = new char[1024];
int len;
while ((len = reader.read(buf)) != -1) {
writer.write(buf, 0, len);
}
return writer.toString();
} finally {
is.close();
}
}
public static void close(Closeable cl) {
if (cl == null) return;
try {
cl.close();
} catch (Exception e) {
}
}
public static void close(Socket s) {
if (s == null) return;
try {
s.close();
} catch (Exception e) {
}
}
public static void close(Closeable... cls) {
for (Closeable cl : cls) {
close(cl);
}
}
public static void close(Context ctx) {
if (ctx == null) return;
try {
ctx.close();
} catch (Exception e) {
}
}
public static void flushAndCloseStream(OutputStream o) {
if (o == null) return;
try {
o.flush();
} catch (Exception e) {
}
try {
o.close();
} catch (Exception e) {
}
}
public static void flushAndCloseOutput(ObjectOutput o) {
if (o == null) return;
try {
o.flush();
} catch (Exception e) {
}
try {
o.close();
} catch (Exception e) {
}
}
public static String formatString(Object message, Object... params) {
if (params.length == 0) return message == null ? "null" : message.toString();
return String.format(message.toString(), params);
}
public static String toStr(Object o) {
if (o == null) {
return "null";
} else if (o.getClass().isArray()) {
// as Java arrays are covariant, this cast is safe unless it's primitive
if (o.getClass().getComponentType().isPrimitive()) {
if (o instanceof byte[]) {
return printArray((byte[]) o, false);
} else if (o instanceof int[]) {
return Arrays.toString((int[]) o);
} else if (o instanceof long[]) {
return Arrays.toString((long[]) o);
} else if (o instanceof short[]) {
return Arrays.toString((short[]) o);
} else if (o instanceof double[]) {
return Arrays.toString((double[]) o);
} else if (o instanceof float[]) {
return Arrays.toString((float[]) o);
} else if (o instanceof char[]) {
return Arrays.toString((char[]) o);
} else if (o instanceof boolean[]) {
return Arrays.toString((boolean[]) o);
}
}
return Arrays.toString((Object[]) o);
} else {
return o.toString();
}
}
public static <E> String toStr(Collection<E> collection) {
if (collection == null)
return "[]";
Iterator<E> i = collection.iterator();
if (!i.hasNext())
return "[]";
StringBuilder sb = new StringBuilder();
sb.append('[');
for (;;) {
E e = i.next();
sb.append(e == collection ? "(this Collection)" : toStr(e));
if (! i.hasNext())
return sb.append(']').toString();
sb.append(", ");
}
}
public static String printArray(byte[] array) {
return printArray(array, false);
}
public static String printArray(byte[] array, boolean withHash) {
if (array == null) return "null";
int limit = 8;
StringBuilder sb = new StringBuilder();
sb.append("[B0x");
if (array.length <= limit || IS_ARRAYS_DEBUG) {
// Convert the entire byte array
sb.append(toHexString(array));
if (withHash) {
sb.append(",h=");
sb.append(Integer.toHexString(Arrays.hashCode(array)));
sb.append(']');
}
} else {
// Pick the first 8 characters and convert that part
sb.append(toHexString(array, limit));
sb.append("..[");
sb.append(array.length);
if (withHash) {
sb.append("],h=");
sb.append(Integer.toHexString(Arrays.hashCode(array)));
}
sb.append(']');
}
return sb.toString();
}
public static String toHexString(byte input[]) {
return input == null ? "null" : toHexString(input, input.length);
}
public static String toHexString(byte input[], int limit) {
if (input == null || input.length <= 0)
return "null";
char lookup[] = {'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
char[] result = new char[(input.length < limit ? input.length : limit) * 2];
int i = 0;
while (i < limit && i < input.length) {
result[2*i] = lookup[(input[i] >> 4) & 0x0F];
result[2*i+1] = lookup[(input[i] & 0x0F)];
i++;
}
return String.valueOf(result);
}
public static String padString(String s, int minWidth) {
if (s.length() < minWidth) {
StringBuilder sb = new StringBuilder(s);
while (sb.length() < minWidth) sb.append(" ");
return sb.toString();
}
return s;
}
private static String INDENT = " ";
public static String threadDump() {
StringBuilder threadDump = new StringBuilder();
ThreadMXBean threadMx = ManagementFactory.getThreadMXBean();
if (threadMx.isObjectMonitorUsageSupported() && threadMx.isSynchronizerUsageSupported()) {
// Print lock info if, and only if, both object monitor usage and synchronizer usage are supported.
dumpThreadInfo(threadDump, true, threadMx);
} else {
dumpThreadInfo(threadDump, false, threadMx);
}
return threadDump.toString();
}
private static void dumpThreadInfo(StringBuilder threadDump, boolean withLocks, ThreadMXBean threadMx) {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String timestamp = dateFormat.format(new Date());
threadDump.append(timestamp);
threadDump.append("\nFull thread dump ");
threadDump.append("\n");
if (withLocks) {
ThreadInfo[] threadInfos = threadMx.dumpAllThreads(true, true);
for (ThreadInfo threadInfo : threadInfos) {
printThreadInfo(threadInfo, threadDump);
LockInfo[] syncs = threadInfo.getLockedSynchronizers();
printLockInfo(syncs, threadDump);
}
threadDump.append("\n");
} else {
long[] threadIds= threadMx.getAllThreadIds();
ThreadInfo[] threadInfos = threadMx.getThreadInfo(threadIds, Integer.MAX_VALUE);
for (ThreadInfo threadInfo : threadInfos)
printThreadInfo(threadInfo, threadDump);
}
}
private static void printThreadInfo(ThreadInfo threadInfo, StringBuilder threadDump) {
// Print thread information
printThread(threadInfo, threadDump);
// print stack trace with locks
StackTraceElement[] stacktrace = threadInfo.getStackTrace();
MonitorInfo[] monitors = threadInfo.getLockedMonitors();
for (int i = 0; i < stacktrace.length; i++) {
StackTraceElement ste = stacktrace[i];
threadDump.append(INDENT + "at " + ste.toString());
threadDump.append("\n");
for (int j = 1; j < monitors.length; j++) {
MonitorInfo mi = monitors[j];
if (mi.getLockedStackDepth() == i) {
threadDump.append(INDENT + " - locked " + mi);
threadDump.append("\n");
}
}
}
threadDump.append("\n");
}
private static void printLockInfo(LockInfo[] locks, StringBuilder threadDump) {
threadDump.append(INDENT + "Locked synchronizers: count = " + locks.length);
threadDump.append("\n");
for (LockInfo li : locks) {
threadDump.append(INDENT + " - " + li);
threadDump.append("\n");
}
threadDump.append("\n");
}
private static void printThread(ThreadInfo threadInfo, StringBuilder threadDump) {
StringBuilder sb = new StringBuilder(
"\"" + threadInfo.getThreadName() + "\"" +
" nid=" + threadInfo.getThreadId() + " state=" +
threadInfo.getThreadState());
if (threadInfo.getLockName() != null && threadInfo.getThreadState() != Thread.State.BLOCKED) {
String[] lockInfo = threadInfo.getLockName().split("@");
sb.append("\n" + INDENT +"- waiting on <0x" + lockInfo[1] + "> (a " + lockInfo[0] + ")");
sb.append("\n" + INDENT +"- locked <0x" + lockInfo[1] + "> (a " + lockInfo[0] + ")");
} else if (threadInfo.getLockName() != null && threadInfo.getThreadState() == Thread.State.BLOCKED) {
String[] lockInfo = threadInfo.getLockName().split("@");
sb.append("\n" + INDENT +"- waiting to lock <0x" + lockInfo[1] + "> (a " + lockInfo[0] + ")");
}
if (threadInfo.isSuspended())
sb.append(" (suspended)");
if (threadInfo.isInNative())
sb.append(" (running in native)");
threadDump.append(sb.toString());
threadDump.append("\n");
if (threadInfo.getLockOwnerName() != null) {
threadDump.append(INDENT + " owned by " + threadInfo.getLockOwnerName() +
" id=" + threadInfo.getLockOwnerId());
threadDump.append("\n");
}
}
public static CacheException rewrapAsCacheException(Throwable t) {
if (t instanceof CacheException)
return (CacheException) t;
else
return new CacheException(t);
}
@SafeVarargs
public static <T> Set<T> asSet(T... a) {
if (a.length > 1)
return new HashSet<>(Arrays.asList(a));
else
return Collections.singleton(a[0]);
}
/**
* Prints the identity hash code of the object passed as parameter
* in an hexadecimal format in order to safe space.
*/
public static String hexIdHashCode(Object o) {
return Integer.toHexString(System.identityHashCode(o));
}
static final String HEX_VALUES = "0123456789ABCDEF";
public static String hexDump(byte[] buffer) {
StringBuilder buf = new StringBuilder(buffer.length << 1);
for (byte b : buffer)
addHexByte(buf, b);
return buf.toString();
}
public static String hexDump(ByteBuffer buffer) {
int bufferLength = buffer.remaining();
int dumpLength = Math.min(bufferLength, 100);
byte[] data = new byte[dumpLength];
int pos = buffer.position();
buffer.get(data);
buffer.position(pos);
StringBuilder sb = new StringBuilder(dumpLength * 2 + 30);
for (byte b : data) {
addHexByte(sb, b);
}
if (dumpLength < bufferLength) {
sb.append("...");
}
sb.append(" (").append(bufferLength).append(" bytes)");
return sb.toString();
}
public static void addHexByte(StringBuilder buf, byte b) {
if (0x20 <= b && b <= 0x7e) {
buf.append('\\');
buf.append((char) b);
} else {
buf.append(HEX_VALUES.charAt((b & 0xF0) >> 4))
.append(HEX_VALUES.charAt((b & 0x0F)));
}
}
private static void addSingleHexByte(StringBuilder buf, byte b) {
buf.append(HEX_VALUES.charAt(b & 0x0F));
}
public static Double constructDouble(Class<?> type, Object o) {
if (type.equals(Long.class) || type.equals(long.class))
return Double.valueOf((Long) o);
else if (type.equals(Double.class) || type.equals(double.class))
return (Double) o;
else if (type.equals(Integer.class) || type.equals(int.class))
return Double.valueOf((Integer) o);
else if (type.equals(String.class))
return Double.valueOf((String) o);
throw new IllegalStateException(String.format("Expected a value that can be converted into a double: type=%s, value=%s", type, o));
}
/**
* Applies the given hash function to the hash code of a given object, and then normalizes it to ensure a positive
* value is always returned.
* @param object to hash
* @param hashFct hash function to apply
* @return a non-null, non-negative normalized hash code for a given object
*/
public static int getNormalizedHash(Object object, Hash hashFct) {
// make sure no negative numbers are involved.
return hashFct.hash(object) & Integer.MAX_VALUE;
}
/**
* Returns the size of each segment, given a number of segments.
* @param numSegments number of segments required
* @return the size of each segment
*/
public static int getSegmentSize(int numSegments) {
return (int)Math.ceil((double)(1L << 31) / numSegments);
}
public static boolean isIBMJavaVendor() {
return javaVendor.toLowerCase().contains("ibm");
}
public static String join(List<String> strings, String separator) {
StringBuilder sb = new StringBuilder();
boolean first = true;
for (String string : strings) {
if (!first) {
sb.append(separator);
} else {
first = false;
}
sb.append(string);
}
return sb.toString();
}
/**
* Returns a number such that the number is a power of two that is equal to, or greater than, the number passed in as
* an argument. The smallest number returned will be 1, not 0.
*/
public static int findNextHighestPowerOfTwo(int num) {
if (num <= 0) return 1;
int highestBit = Integer.highestOneBit(num);
return num <= highestBit ? highestBit : highestBit << 1;
}
/**
* A function that calculates hash code of a byte array based on its
* contents but using the given size parameter as deliminator for the
* content.
*/
public static int hashCode(byte[] bytes, int size) {
int contentLimit = size;
if (size > bytes.length)
contentLimit = bytes.length;
int hashCode = 1;
for (int i = 0; i < contentLimit; i++)
hashCode = 31 * hashCode + bytes[i];
return hashCode;
}
/**
*
* Prints {@link Subject}'s principals as a one-liner
* (as opposed to default Subject's <code>toString()</code> method, which prints every principal on separate line).
*
*/
public static String prettyPrintSubject(Subject subject) {
return (subject == null) ? "null" : "Subject with principal(s): " + toStr(subject.getPrincipals());
}
/**
* Concatenates an arbitrary number of arrays returning a new array containing all elements
*/
@SafeVarargs
public static <T> T[] arrayConcat(T[] first, T[]... rest) {
int totalLength = first.length;
for (T[] array : rest) {
totalLength += array.length;
}
T[] result = Arrays.copyOf(first, totalLength);
int offset = first.length;
for (T[] array : rest) {
System.arraycopy(array, 0, result, offset, array.length);
offset += array.length;
}
return result;
}
/**
* Uses a {@link ThreadLocalRandom} to generate a UUID. Faster, but not secure
*/
public static UUID threadLocalRandomUUID() {
byte[] data = new byte[16];
ThreadLocalRandom.current().nextBytes(data);
data[6] &= 0x0f; /* clear version */
data[6] |= 0x40; /* set to version 4 */
data[8] &= 0x3f; /* clear variant */
data[8] |= 0x80; /* set to IETF variant */
long msb = 0;
long lsb = 0;
for (int i = 0; i < 8; i++)
msb = (msb << 8) | (data[i] & 0xff);
for (int i = 8; i < 16; i++)
lsb = (lsb << 8) | (data[i] & 0xff);
return new UUID(msb, lsb);
}
public static String unicodeEscapeString(String s) {
int len = s.length();
StringBuilder out = new StringBuilder(len * 2);
for (int x = 0; x < len; x++) {
char aChar = s.charAt(x);
if ((aChar > 61) && (aChar < 127)) {
if (aChar == '\\') {
out.append('\\');
out.append('\\');
continue;
}
out.append(aChar);
continue;
}
switch (aChar) {
case ' ':
if (x == 0)
out.append('\\');
out.append(' ');
break;
case '\t':
out.append('\\');
out.append('t');
break;
case '\n':
out.append('\\');
out.append('n');
break;
case '\r':
out.append('\\');
out.append('r');
break;
case '\f':
out.append('\\');
out.append('f');
break;
case '=':
case ':':
case '#':
case '!':
out.append('\\');
out.append(aChar);
break;
default:
if ((aChar < 0x0020) || (aChar > 0x007e)) {
out.append('\\');
out.append('u');
addSingleHexByte(out, (byte)((aChar >> 12) & 0xF));
addSingleHexByte(out, (byte)((aChar >> 8) & 0xF));
addSingleHexByte(out, (byte)((aChar >> 4) & 0xF));
addSingleHexByte(out, (byte)(aChar & 0xF));
} else {
out.append(aChar);
}
}
}
return out.toString();
}
public static String unicodeUnescapeString(String s) {
int len = s.length();
StringBuilder out = new StringBuilder(len);
for (int x = 0; x < len; x++) {
char ch = s.charAt(x);
if (ch == '\\') {
ch = s.charAt(++x);
if (ch == 'u') {
int value = 0;
for (int i = 0; i < 4; i++) {
ch = s.charAt(++x);
if (ch >= '0' && ch <= '9') {
value = (value << 4) + ch - '0';
} else if (ch >= 'a' && ch <= 'f') {
value = (value << 4) + 10 + ch - 'a';
} else if (ch >= 'A' && ch <= 'F') {
value = (value << 4) + 10 + ch - 'A';
} else throw new IllegalArgumentException("Malformed \\uxxxx encoding.");
}
out.append((char) value);
} else {
if (ch == 't')
ch = '\t';
else if (ch == 'r')
ch = '\r';
else if (ch == 'n')
ch = '\n';
else if (ch == 'f')
ch = '\f';
out.append(ch);
}
} else {
out.append(ch);
}
}
return out.toString();
}
/**
* Deletes directory recursively.
*
* @param directoryName Directory to be deleted
*/
public static void recursiveFileRemove(String directoryName) {
File file = new File(directoryName);
recursiveFileRemove(file);
}
/**
* Deletes directory recursively.
*
* @param directory Directory to be deleted
*/
public static void recursiveFileRemove(File directory) {
if (directory.exists()) {
log.tracef("Deleting file %s", directory);
recursiveDelete(directory);
}
}
private static void recursiveDelete(File f) {
File absoluteFile = f.getAbsoluteFile();
if (absoluteFile.isDirectory()) {
File[] files = absoluteFile.listFiles();
if (files != null) {
for (File file : files) {
recursiveDelete(file);
}
}
}
absoluteFile.delete();
}
public static boolean isBasicType(Class<?> type) {
return BASIC_TYPES.contains(type);
}
public static String xmlify(String s) {
StringBuilder sb = new StringBuilder();
for(int i=0; i < s.length(); i++) {
char ch = s.charAt(i);
if (Character.isUpperCase(ch)) {
sb.append('-');
sb.append(Character.toLowerCase(ch));
} else {
sb.append(ch);
}
}
return sb.toString();
}
}