org.crsh.util.Utils Maven / Gradle / Ivy
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/*
* Copyright (C) 2012 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.crsh.util;
import javax.naming.Context;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.Flushable;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.net.Socket;
import java.nio.charset.Charset;
import java.sql.*;
import java.io.File;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Utils {
/** . */
private static final Iterator EMPTY_ITERATOR = Collections.emptyList().iterator();
/** . */
private static final Pattern p = Pattern.compile("\\S+");
public static Iterator iterator() {
@SuppressWarnings("unchecked")
Iterator iterator = (Iterator)EMPTY_ITERATOR;
return iterator;
}
public static Iterator iterator(final E element) {
return new BaseIterator() {
boolean hasNext = true;
@Override
public boolean hasNext() {
return hasNext;
}
@Override
public E next() {
if (hasNext) {
hasNext = false;
return element;
} else {
throw new NoSuchElementException();
}
}
};
}
public static E first(Iterable elements) {
Iterator i = elements.iterator();
return i.hasNext() ? i.next() : null;
}
public static > M map(M map, K key, V value) {
map.put(key, value);
return map;
}
public static HashMap map(K key, V value) {
HashMap map = new HashMap();
map.put(key, value);
return map;
}
public static HashSet set(E... elements) {
HashSet set = new HashSet(elements.length);
Collections.addAll(set, elements);
return set;
}
public static List list(E... elements) {
return Arrays.asList(elements);
}
public static List list(Iterable iterable) {
return list(iterable.iterator());
}
public static List list(Iterator iterator) {
ArrayList list = new ArrayList();
while (iterator.hasNext()) {
list.add(iterator.next());
}
return list;
}
public static int indexOf(CharSequence s, int off, char c) {
for (int len = s.length();off < len;off++) {
if (s.charAt(off) == c) {
return off;
}
}
return -1;
}
public static String trimLeft(String s) {
if (s == null) {
throw new NullPointerException("No null string accepted");
}
int index = 0;
int len = s.length();
while (index < len) {
if (s.charAt(index) == ' ') {
index++;
} else {
break;
}
}
if (index > 0) {
return s.substring(index);
} else {
return s;
}
}
private static final Pattern blankPattern = Pattern.compile("^\\s*$");
public static boolean notBlank(String s) {
return !blankPattern.matcher(s).find();
}
public static E notNull(E e1, E e2) {
if (e1 != null) {
return e1;
} else {
return e2;
}
}
/**
* Return the value when it is positive otherwise return 0.
*
* @param value the value
* @return the non negative value
*/
public static int notNegative(int value) {
return value >= 0 ? value : 0;
}
private static final Pattern FOO = Pattern.compile("" +
"(\\*)" + // Wildcard *
"|" +
"(\\?)" + // Wildcard ?
"|" +
"(?:\\[([^)]+)\\])" + // Range
"|" +
"(\\\\.)" // Escape
);
/**
* Create a pattern that transforms a glob expression into a regular expression, the following task are supported
*
* - * : Match any number of unknown characters
* - ? : Match one unknown character
* - [characters] : Match a character as part of a group of characters
* - \ : Escape character
*
*
* @param globex the glob expression
* @return the regular expression
* @throws NullPointerException when the globex argument is null
*/
public static String globexToRegex(String globex) throws NullPointerException {
if (globex == null) {
throw new NullPointerException("No null globex accepted");
}
StringBuilder regex = new StringBuilder();
int prev = 0;
Matcher matcher = FOO.matcher(globex);
while (matcher.find()) {
int next = matcher.start();
if (next > prev) {
regex.append(Pattern.quote(globex.substring(prev, next)));
}
if (matcher.group(1) != null) {
regex.append(".*");
} else if (matcher.group(2) != null) {
regex.append(".");
} else if (matcher.group(3) != null) {
regex.append("[");
regex.append(Pattern.quote(matcher.group(3)));
regex.append("]");
} else if (matcher.group(4) != null) {
regex.append(Pattern.quote(Character.toString(matcher.group(4).charAt(1))));
} else {
throw new UnsupportedOperationException("Not handled yet");
}
prev = matcher.end();
}
if (prev < globex.length()) {
regex.append(Pattern.quote(globex.substring(prev)));
}
return regex.toString();
}
/**
<<<<<<< HEAD
* Close the socket and catch any exception thrown.
*
* @param socket the socket to close
* @return any Exception thrown during the close operation
*/
public static Exception close(Socket socket) {
if (socket != null) {
try {
socket.close();
}
catch (Exception e) {
return e;
}
}
return null;
}
/**
* Close the closeable and catch any exception thrown.
*
* @param closeable the closeable to close
* @return any Exception thrown during the close operation
*/
public static Exception close(Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
}
catch (Exception e) {
return e;
}
}
return null;
}
/**
* Close the connection and catch any exception thrown.
*
* @param connection the socket to close
* @return any Exception thrown during the close operation
*/
public static Exception close(Connection connection) {
if (connection != null) {
try {
connection.close();
}
catch (Exception e) {
return e;
}
}
return null;
}
/**
* Close the statement and catch any exception thrown.
*
* @param statement the statement to close
* @return any Exception thrown during the close operation
*/
public static Exception close(java.sql.Statement statement) {
if (statement != null) {
try {
statement.close();
}
catch (Exception e) {
return e;
}
}
return null;
}
/**
* Close the result set and catch any exception thrown.
*
* @param rs the result set to close
* @return any Exception thrown during the close operation
*/
public static Exception close(ResultSet rs) {
if (rs != null) {
try {
rs.close();
}
catch (Exception e) {
return e;
}
}
return null;
}
/**
* Close the context and catch any exception thrown.
*
* @param context the context to close
* @return any Exception thrown during the close operation
*/
public static Exception close(Context context) {
if (context != null) {
try {
context.close();
}
catch (Exception e) {
return e;
}
}
return null;
}
public static void rethrow(Class throwableClass, Throwable cause) throws T {
T throwable;
//
try {
throwable = throwableClass.newInstance();
}
catch (Exception e) {
throw new AssertionError(e);
}
//
throwable.initCause(cause);
//
throw throwable;
}
public static boolean equals(Object o1, Object o2) {
return o1 == null ? o2 == null : (o2 != null && o1.equals(o2));
}
public static boolean notEquals(Object o1, Object o2) {
return !equals(o1, o2);
}
/**
* Flush the flushable and catch any exception thrown.
*
* @param flushable the flushable to flush
* @return any Exception thrown during the flush operation
*/
public static Exception flush(Flushable flushable) {
if (flushable != null) {
try {
flushable.flush();
}
catch (Exception e) {
return e;
}
}
return null;
}
public static List chunks(CharSequence s) {
List chunks = new ArrayList();
Matcher m = p.matcher(s);
while (m.find()) {
chunks.add(m.group());
}
return chunks;
}
public static String join(Iterable strings, String separator) {
Iterator i = strings.iterator();
if (i.hasNext()) {
String first = i.next();
if (i.hasNext()) {
StringBuilder buf = new StringBuilder();
buf.append(first);
while (i.hasNext()) {
buf.append(separator);
buf.append(i.next());
}
return buf.toString();
} else {
return first;
}
} else {
return "";
}
}
public static String[] split(CharSequence s, char separator) {
return foo(s, separator, 0, 0, 0);
}
public static String[] split(CharSequence s, char separator, int rightPadding) {
if (rightPadding < 0) {
throw new IllegalArgumentException("Right padding cannot be negative");
}
return foo(s, separator, 0, 0, rightPadding);
}
private static String[] foo(CharSequence s, char separator, int count, int from, int rightPadding) {
int len = s.length();
if (from < len) {
int to = from;
while (to < len && s.charAt(to) != separator) {
to++;
}
String[] ret;
if (to == len - 1) {
ret = new String[count + 2 + rightPadding];
ret[count + 1] = "";
}
else {
ret = to == len ? new String[count + 1 + rightPadding] : foo(s, separator, count + 1, to + 1, rightPadding);
}
ret[count] = from == to ? "" : s.subSequence(from, to).toString();
return ret;
}
else if (from == len) {
return new String[count + rightPadding];
}
else {
throw new AssertionError();
}
}
/**
* @see #findLongestCommonPrefix(Iterable)
*/
public static String findLongestCommonPrefix(CharSequence... seqs) {
return findLongestCommonPrefix(Arrays.asList(seqs));
}
/**
* Find the longest possible common prefix of the provided char sequence.
*
* @param seqs the sequences
* @return the longest possible prefix
*/
public static String findLongestCommonPrefix(Iterable seqs) {
String common = "";
out:
while (true) {
String candidate = null;
for (CharSequence s : seqs) {
if (common.length() + 1 > s.length()) {
break out;
} else {
if (candidate == null) {
candidate = s.subSequence(0, common.length() + 1).toString();
} else if (s.subSequence(0, common.length() + 1).toString().equals(candidate)) {
// Ok it is a prefix
} else {
break out;
}
}
}
if (candidate == null) {
break;
} else {
common = candidate;
}
}
return common;
}
public static byte[] readAsBytes(InputStream in) throws IOException {
return read(in).toByteArray();
}
public static String readAsUTF8(InputStream in) {
try {
ByteArrayOutputStream baos = read(in);
return baos.toString("UTF-8");
}
catch (IOException e) {
e.printStackTrace();
return null;
}
}
public static void copy(InputStream in, OutputStream out) throws IOException {
if (in == null) {
throw new NullPointerException();
}
try {
byte[] buffer = new byte[256];
for (int l = in.read(buffer); l != -1; l = in.read(buffer)) {
out.write(buffer, 0, l);
}
}
finally {
close(in);
}
}
private static ByteArrayOutputStream read(InputStream in) throws IOException {
if (in == null) {
throw new NullPointerException();
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
copy(in, baos);
return baos;
}
/*
* Convert an file URL to a file, avoids issues on windows with whitespaces.
*
* @param url the URL to convert
* @return the related file
* @throws java.lang.IllegalArgumentException if the url protocol is not file
* @throws java.lang.NullPointerException if the url argument is null
*/
public static File toFile(URL url) throws IllegalArgumentException, NullPointerException {
if (url == null) {
throw new NullPointerException("No null URL accepted");
}
if (!url.getProtocol().equals("file")) {
throw new IllegalArgumentException("Not file protocol");
}
try {
return new File(url.toURI());
} catch(URISyntaxException e) {
return new File(url.getPath());
}
}
public static Class resolveToClass(Type implementation, Class type, int parameterIndex) {
if (implementation == null) {
throw new NullPointerException("No null type accepted");
}
// First resolve to type
Type resolvedType = resolve(implementation, type, parameterIndex);
//
if (resolvedType != null) {
return resolveToClass(resolvedType);
} else {
return null;
}
}
public static Class resolveToClass(Type type) {
if (type == null) {
throw new NullPointerException("No null type accepted");
}
if (type instanceof Class) {
return (Class)type;
} else if (type instanceof TypeVariable) {
TypeVariable resolvedTypeVariable = (TypeVariable)type;
return resolveToClass(resolvedTypeVariable.getBounds()[0]);
} else {
throw new UnsupportedOperationException("Type resolution of " + type + " not yet implemented");
}
}
/**
* A simplistic implementation, it may not handle all cases but it should handle enough.
*
* @param implementation the type for which the parameter requires a resolution
* @param type the type that owns the parameter
* @param parameterIndex the parameter index
* @return the resolved type
*/
public static Type resolve(Type implementation, Class type, int parameterIndex) {
if (implementation == null) {
throw new NullPointerException();
}
//
if (implementation == type) {
TypeVariable>[] tp = type.getTypeParameters();
if (parameterIndex < tp.length) {
return tp[parameterIndex];
} else {
throw new IllegalArgumentException();
}
} else if (implementation instanceof Class) {
Class c = (Class) implementation;
Type gsc = c.getGenericSuperclass();
Type resolved = null;
if (gsc != null) {
resolved = resolve(gsc, type, parameterIndex);
if (resolved == null) {
// Try with interface
}
}
return resolved;
} else if (implementation instanceof ParameterizedType) {
ParameterizedType pt = (ParameterizedType) implementation;
Type[] typeArgs = pt.getActualTypeArguments();
Type rawType = pt.getRawType();
if (rawType == type) {
return typeArgs[parameterIndex];
} else if (rawType instanceof Class) {
Class classRawType = (Class)rawType;
Type resolved = resolve(classRawType, type, parameterIndex);
if (resolved == null) {
return null;
} else if (resolved instanceof TypeVariable) {
TypeVariable resolvedTV = (TypeVariable)resolved;
TypeVariable[] a = classRawType.getTypeParameters();
for (int i = 0;i < a.length;i++) {
if (a[i].equals(resolvedTV)) {
return resolve(implementation, classRawType, i);
}
}
throw new AssertionError();
} else {
throw new UnsupportedOperationException("Cannot support resolution of " + resolved);
}
} else {
throw new UnsupportedOperationException();
}
} else {
throw new UnsupportedOperationException("todo " + implementation + " " + implementation.getClass());
}
}
public static boolean instanceOf(Class c, List types) {
for (String type: types) {
if (instanceOf(c, type)) {
return true;
}
}
return false;
}
public static boolean instanceOf(Class c, String type) {
if (c.getName().equals(type)) {
return true;
}
for (Class i : c.getInterfaces()) {
if (instanceOf(i, type)) {
return true;
}
}
if (c.getSuperclass() != null) {
return instanceOf(c.getSuperclass(), type);
}
return false;
}
/** . */
private static final int ESCAPE = -1, SCANNING = 0, DOLLAR = 1, EVALUATING = 2;
/**
* Interpolate a string and replace the occurence from a context map, the syntax for a variable
* is ${} and it can accept a default value used when the variable cannot be resolved
* with the :- separator:
*
*
* {} + "foo" => "foo"{} + "${foo}" => ""{} + "\\${foo}" => "${foo}"{foo:bar} + "${foo}" => "bar"{} + "${foo:-bar}" => "bar"
*
* @param interpolated the value to interpolate
* @param context the context
* @return the interpolated string
* @throws NullPointerException if the interpolated argument is null
*/
public static String interpolate(String interpolated, Map context) throws NullPointerException {
StringBuilder sb = new StringBuilder();
int status = 0;
int prev = 0;
int length = interpolated.length();
for (int i = 0;i < length;i++) {
char c = interpolated.charAt(i);
switch (status) {
case ESCAPE:
if (c == '$') {
sb.append('$');
} else {
sb.append('\\').append(c);
}
status = SCANNING;
break;
case SCANNING:
if (c == '$') {
status = DOLLAR;
} else if (c == '\\') {
status = ESCAPE;
} else {
sb.append(c);
}
break;
case DOLLAR:
if (c == '{') {
status = EVALUATING;
prev = i + 1;
} else {
sb.append('$').append(c);
}
break;
case EVALUATING:
if (c == '}') {
int j = prev + 1;
while (j < i) {
if (j < length && interpolated.charAt(j - 1) == ':' && interpolated.charAt(j) == '-') {
break;
} else {
j++;
}
}
Object value;
if (j < i) {
String key = interpolated.substring(prev, j - 1);
value = context.get(key);
if (value == null) {
value = interpolated.substring(j + 1, i);
}
} else {
String key = interpolated.substring(prev, i);
value = context.get(key);
}
if (value != null) {
sb.append(value);
}
status = SCANNING;
}
break;
}
}
switch (status) {
case DOLLAR:
sb.append('$');
break;
case EVALUATING:
sb.append("${").append(interpolated, prev, interpolated.length());
break;
}
return sb.toString();
}
/**
* @return the current user directory
*/
public static File getCurrentDirectory() {
String userDir = System.getProperty("user.dir");
return new File(userDir);
}
/** . */
public static final Charset UTF_8;
static {
UTF_8 = Charset.forName("UTF-8");
}
}
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