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org.rapidoid.u.U Maven / Gradle / Ivy
package org.rapidoid.u;
/*
* #%L
* rapidoid-u
* %%
* Copyright (C) 2014 - 2016 Nikolche Mihajlovski and contributors
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
import org.rapidoid.lambda.Dynamic;
import org.rapidoid.lambda.Mapper;
import java.io.File;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.*;
import java.util.Map.Entry;
import java.util.concurrent.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* @author Nikolche Mihajlovski
* @since 2.0.0
*/
public class U {
public static String str(Object obj) {
if (obj == null) {
return "null";
} else if (obj instanceof byte[]) {
return Arrays.toString((byte[]) obj);
} else if (obj instanceof short[]) {
return Arrays.toString((short[]) obj);
} else if (obj instanceof int[]) {
return Arrays.toString((int[]) obj);
} else if (obj instanceof long[]) {
return Arrays.toString((long[]) obj);
} else if (obj instanceof float[]) {
return Arrays.toString((float[]) obj);
} else if (obj instanceof double[]) {
return Arrays.toString((double[]) obj);
} else if (obj instanceof boolean[]) {
return Arrays.toString((boolean[]) obj);
} else if (obj instanceof char[]) {
return Arrays.toString((char[]) obj);
} else if (obj instanceof Object[]) {
return str((Object[]) obj);
} else {
return String.valueOf(obj);
}
}
public static String str(Object[] objs) {
StringBuilder sb = new StringBuilder();
sb.append("[");
for (int i = 0; i < objs.length; i++) {
if (i > 0) {
sb.append(", ");
}
sb.append(str(objs[i]));
}
sb.append("]");
return sb.toString();
}
public static String str(Iterable coll) {
StringBuilder sb = new StringBuilder();
sb.append("[");
boolean first = true;
for (Object obj : coll) {
if (!first) {
sb.append(", ");
}
sb.append(str(obj));
first = false;
}
sb.append("]");
return sb.toString();
}
public static String str(Iterator it) {
StringBuilder sb = new StringBuilder();
sb.append("[");
boolean first = true;
while (it.hasNext()) {
if (first) {
sb.append(", ");
first = false;
}
sb.append(str(it.next()));
}
sb.append("]");
return sb.toString();
}
public static String frmt(String format, Object... args) {
for (int i = 0; i < args.length; i++) {
if (!(args[i] instanceof Number)) {
args[i] = str(args[i]);
}
}
return String.format(format, args);
}
public static String replace(String s, String[][] repls) {
for (String[] repl : repls) {
U.must(repl.length == 2, "Expected pairs of [search, replacement] strings!");
s = s.replaceAll(Pattern.quote(repl[0]), repl[1]);
}
return s;
}
public static String replace(String s, String regex, Mapper replacer) {
StringBuffer output = new StringBuffer();
Pattern p = Pattern.compile(regex);
Matcher matcher = p.matcher(s);
while (matcher.find()) {
int len = matcher.groupCount() + 1;
String[] groups = new String[len];
for (int i = 0; i < groups.length; i++) {
groups[i] = matcher.group(i);
}
Object value;
try {
value = replacer.map(groups);
} catch (Exception e) {
throw rte(e);
}
matcher.appendReplacement(output, str(value));
}
matcher.appendTail(output);
return output.toString();
}
public static void print(Object... values) {
String text;
if (values != null) {
text = values.length == 1 ? str(values[0]) : str(values);
} else {
text = "null";
}
System.out.println(text);
}
@SuppressWarnings({"varargs"})
public static String join(String sep, T... items) {
return render(items, "%s", sep);
}
public static String join(String sep, Iterable items) {
return render(items, "%s", sep);
}
public static String join(String sep, char[][] items) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < items.length; i++) {
if (i > 0) {
sb.append(sep);
}
sb.append(items[i]);
}
return sb.toString();
}
public static String render(Object[] items, String itemFormat, String sep) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < items.length; i++) {
if (i > 0) {
sb.append(sep);
}
sb.append(frmt(itemFormat, items[i]));
}
return sb.toString();
}
public static String render(Iterable items, String itemFormat, String sep) {
StringBuilder sb = new StringBuilder();
int i = 0;
Iterator it = items.iterator();
while (it.hasNext()) {
Object item = it.next();
if (i > 0) {
sb.append(sep);
}
sb.append(frmt(itemFormat, item));
i++;
}
return sb.toString();
}
public static Iterator iterator(T[] arr) {
return Arrays.asList(arr).iterator();
}
@SuppressWarnings({"varargs"})
public static T[] array(T... items) {
return items;
}
public static Object[] array(Iterable items) {
return (items instanceof Collection) ? ((Collection) items).toArray() : list(items).toArray();
}
@SuppressWarnings("unchecked")
public static Set synchronizedSet() {
return (Set) Collections.synchronizedSet(set());
}
public static Set set() {
return new LinkedHashSet();
}
public static Set set(Iterable values) {
Set set = set();
for (T val : values) {
set.add(val);
}
return set;
}
@SuppressWarnings({"varargs"})
public static Set set(T... values) {
Set set = set();
for (T val : values) {
set.add(val);
}
return set;
}
@SuppressWarnings("unchecked")
public static List synchronizedList() {
return (List) Collections.synchronizedList(list());
}
public static List list() {
return new ArrayList();
}
public static List list(Iterable values) {
List list = list();
for (T item : values) {
list.add(item);
}
return list;
}
@SuppressWarnings({"varargs"})
public static List list(T... values) {
List list = list();
for (T item : values) {
list.add(item);
}
return list;
}
public static Map map() {
return new LinkedHashMap();
}
public static Map map(Map src) {
Map map = map();
map.putAll(src);
return map;
}
public static Map map(K key, V value) {
Map map = map();
map.put(key, value);
return map;
}
public static Map map(K key1, V value1, K key2, V value2) {
Map map = map(key1, value1);
map.put(key2, value2);
return map;
}
public static Map map(K key1, V value1, K key2, V value2, K key3, V value3) {
Map map = map(key1, value1, key2, value2);
map.put(key3, value3);
return map;
}
public static Map map(K key1, V value1, K key2, V value2, K key3, V value3, K key4, V value4) {
Map map = map(key1, value1, key2, value2, key3, value3);
map.put(key4, value4);
return map;
}
public static Map map(K key1, V value1, K key2, V value2, K key3, V value3, K key4, V value4, K key5,
V value5) {
Map map = map(key1, value1, key2, value2, key3, value3, key4, value4);
map.put(key5, value5);
return map;
}
@SuppressWarnings("unchecked")
public static Map map(Object... keysAndValues) {
must(keysAndValues.length % 2 == 0, "Incorrect number of arguments (expected key-value pairs)!");
Map map = map();
for (int i = 0; i < keysAndValues.length / 2; i++) {
map.put((K) keysAndValues[i * 2], (V) keysAndValues[i * 2 + 1]);
}
return map;
}
public static ConcurrentMap concurrentMap() {
return new ConcurrentHashMap();
}
public static ConcurrentMap concurrentMap(Map src, boolean ignoreNullValues) {
ConcurrentMap map = concurrentMap();
for (Entry e : src.entrySet()) {
if (!ignoreNullValues || e.getValue() != null) {
map.put(e.getKey(), e.getValue());
}
}
return map;
}
public static ConcurrentMap concurrentMap(K key, V value) {
ConcurrentMap map = concurrentMap();
map.put(key, value);
return map;
}
public static ConcurrentMap concurrentMap(K key1, V value1, K key2, V value2) {
ConcurrentMap map = concurrentMap(key1, value1);
map.put(key2, value2);
return map;
}
public static ConcurrentMap concurrentMap(K key1, V value1, K key2, V value2, K key3, V value3) {
ConcurrentMap map = concurrentMap(key1, value1, key2, value2);
map.put(key3, value3);
return map;
}
public static ConcurrentMap concurrentMap(K key1, V value1, K key2, V value2, K key3, V value3,
K key4, V value4) {
ConcurrentMap map = concurrentMap(key1, value1, key2, value2, key3, value3);
map.put(key4, value4);
return map;
}
public static ConcurrentMap concurrentMap(K key1, V value1, K key2, V value2, K key3, V value3,
K key4, V value4, K key5, V value5) {
ConcurrentMap map = concurrentMap(key1, value1, key2, value2, key3, value3, key4, value4);
map.put(key5, value5);
return map;
}
@SuppressWarnings("unchecked")
public static ConcurrentMap concurrentMap(Object... keysAndValues) {
must(keysAndValues.length % 2 == 0, "Incorrect number of arguments (expected key-value pairs)!");
ConcurrentMap map = concurrentMap();
for (int i = 0; i < keysAndValues.length / 2; i++) {
map.put((K) keysAndValues[i * 2], (V) keysAndValues[i * 2 + 1]);
}
return map;
}
public static Map orderedMap() {
return new LinkedHashMap();
}
public static Map orderedMap(Map src, boolean ignoreNullValues) {
Map map = orderedMap();
for (Entry e : src.entrySet()) {
if (!ignoreNullValues || e.getValue() != null) {
map.put(e.getKey(), e.getValue());
}
}
return map;
}
public static Map orderedMap(K key, V value) {
Map map = orderedMap();
map.put(key, value);
return map;
}
public static Map orderedMap(K key1, V value1, K key2, V value2) {
Map map = orderedMap(key1, value1);
map.put(key2, value2);
return map;
}
public static Map orderedMap(K key1, V value1, K key2, V value2, K key3, V value3) {
Map map = orderedMap(key1, value1, key2, value2);
map.put(key3, value3);
return map;
}
public static Map orderedMap(K key1, V value1, K key2, V value2, K key3, V value3, K key4, V value4) {
Map map = orderedMap(key1, value1, key2, value2, key3, value3);
map.put(key4, value4);
return map;
}
public static Map orderedMap(K key1, V value1, K key2, V value2, K key3, V value3, K key4, V value4,
K key5, V value5) {
Map map = orderedMap(key1, value1, key2, value2, key3, value3, key4, value4);
map.put(key5, value5);
return map;
}
@SuppressWarnings("unchecked")
public static Map orderedMap(Object... keysAndValues) {
must(keysAndValues.length % 2 == 0, "Incorrect number of arguments (expected key-value pairs)!");
Map map = orderedMap();
for (int i = 0; i < keysAndValues.length / 2; i++) {
map.put((K) keysAndValues[i * 2], (V) keysAndValues[i * 2 + 1]);
}
return map;
}
public static Map synchronizedMap() {
return Collections.synchronizedMap(U.map());
}
public static Queue queue() {
return new ConcurrentLinkedQueue();
}
public static BlockingQueue queue(int maxSize) {
argMust(maxSize > 0, "Maximum queue size must be > 0!");
return new ArrayBlockingQueue(maxSize);
}
public static T or(T value, T fallback) {
return value != null ? value : fallback;
}
public static String safe(String s) {
return or(s, "");
}
public static boolean safe(Boolean b) {
return or(b, false);
}
public static int safe(Integer num) {
return or(num, 0);
}
public static long safe(Long num) {
return or(num, 0L);
}
public static byte safe(Byte num) {
return or(num, (byte) 0);
}
public static float safe(Float num) {
return or(num, 0.0f);
}
public static double safe(Double num) {
return or(num, 0.0);
}
public static Object[] safe(Object[] arr) {
return arr != null ? arr : new Object[0];
}
public static List safe(List list) {
return list != null ? list : U.list();
}
public static Set safe(Set set) {
return set != null ? set : U.set();
}
public static Map safe(Map map) {
return map != null ? map : U.map();
}
public static long time() {
return System.currentTimeMillis();
}
public static boolean xor(boolean a, boolean b) {
return a && !b || b && !a;
}
public static boolean eq(Object a, Object b) {
return a == null ? b == null : a.equals(b);
}
public static RuntimeException rte(String message) {
return new RuntimeException(message);
}
public static RuntimeException rte(String message, Throwable cause) {
return new RuntimeException(message, cause);
}
public static RuntimeException rte(Throwable cause) {
return rte("", cause);
}
public static RuntimeException rte(String message, Object... args) {
return rte(frmt(message, args));
}
public static RuntimeException notExpected() {
return rte("This operation is not expected to be called!");
}
public static RuntimeException notReady() {
return rte("Not yet implemented!");
}
public static RuntimeException notSupported() {
return rte("This operation is not supported by this implementation!");
}
public static void rteIf(boolean failureCondition, String msg) {
if (failureCondition) {
throw rte(msg);
}
}
public static boolean must(boolean expectedCondition, String message) {
if (!expectedCondition) {
throw rte(message);
}
return true;
}
public static RuntimeException rte(String message, Throwable cause, Object... args) {
return rte(frmt(message, args), cause);
}
public static boolean must(boolean expectedCondition) {
if (!expectedCondition) {
throw rte("Expectation failed!");
}
return true;
}
public static boolean must(boolean expectedCondition, String message, long arg) {
if (!expectedCondition) {
throw rte(message, arg);
}
return true;
}
public static boolean must(boolean expectedCondition, String message, Object arg) {
if (!expectedCondition) {
throw rte(message, str(arg));
}
return true;
}
public static boolean must(boolean expectedCondition, String message, Object arg1, Object arg2) {
if (!expectedCondition) {
throw rte(message, str(arg1), str(arg2));
}
return true;
}
public static boolean must(boolean expectedCondition, String message, Object arg1, Object arg2, Object arg3) {
if (!expectedCondition) {
throw rte(message, str(arg1), str(arg2), str(arg3));
}
return true;
}
public static IllegalArgumentException illegalArg(String message, Object... args) {
return new IllegalArgumentException(frmt(message, args));
}
public static void secure(boolean condition, String msg) {
if (!condition) {
throw new SecurityException(str(msg));
}
}
public static void secure(boolean condition, String msg, Object arg) {
if (!condition) {
throw new SecurityException(frmt(msg, arg));
}
}
public static void secure(boolean condition, String msg, Object arg1, Object arg2) {
if (!condition) {
throw new SecurityException(frmt(msg, arg1, arg2));
}
}
public static void bounds(int value, int min, int max) {
must(value >= min && value <= max, "%s is not in the range [%s, %s]!", value, min, max);
}
public static T notNull(T value, String msgOrDesc, Object... descArgs) {
if (value == null) {
throw rte("%s must NOT be null!", frmt(msgOrDesc, descArgs));
}
return value;
}
public static boolean isEmpty(String value) {
return value == null || value.isEmpty();
}
public static boolean isEmpty(Object[] arr) {
return arr == null || arr.length == 0;
}
public static boolean isEmpty(Collection coll) {
return coll == null || coll.isEmpty();
}
public static boolean isEmpty(Iterable iter) {
return iter.iterator().hasNext();
}
public static boolean isEmpty(Map map) {
return map == null || map.isEmpty();
}
public static boolean isEmpty(Object value) {
if (value == null) {
return true;
} else if (value instanceof String) {
return isEmpty((String) value);
} else if (value instanceof byte[]) {
return ((byte[]) value).length == 0;
} else if (value instanceof short[]) {
return ((short[]) value).length == 0;
} else if (value instanceof int[]) {
return ((int[]) value).length == 0;
} else if (value instanceof long[]) {
return ((long[]) value).length == 0;
} else if (value instanceof float[]) {
return ((float[]) value).length == 0;
} else if (value instanceof double[]) {
return ((double[]) value).length == 0;
} else if (value instanceof boolean[]) {
return ((boolean[]) value).length == 0;
} else if (value instanceof char[]) {
return ((char[]) value).length == 0;
} else if (value instanceof Object[]) {
return ((Object[]) value).length == 0;
} else if (value instanceof Collection) {
return isEmpty((Collection) value);
} else if (value instanceof Map) {
return isEmpty((Map) value);
} else if (value instanceof Iterable) {
return isEmpty((Iterable) value);
}
return false;
}
public static boolean notEmpty(String value) {
return !isEmpty(value);
}
public static boolean notEmpty(Object[] arr) {
return !isEmpty(arr);
}
public static boolean notEmpty(Collection coll) {
return !isEmpty(coll);
}
public static boolean notEmpty(Iterable iter) {
return !isEmpty(iter);
}
public static boolean notEmpty(Map map) {
return !isEmpty(map);
}
public static boolean notEmpty(Object value) {
return !isEmpty(value);
}
public static String capitalized(String s) {
return s.isEmpty() ? s : s.substring(0, 1).toUpperCase() + s.substring(1);
}
public static String uncapitalized(String s) {
return s.isEmpty() ? s : s.substring(0, 1).toLowerCase() + s.substring(1);
}
public static String mul(String s, int n) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < n; i++) {
sb.append(s);
}
return sb.toString();
}
public static String mid(String s, int beginIndex, int endIndex) {
if (endIndex < 0) {
endIndex = s.length() + endIndex;
}
return s.substring(beginIndex, endIndex);
}
public static String insert(String target, int atIndex, String insertion) {
return target.substring(0, atIndex) + insertion + target.substring(atIndex);
}
public static int num(String s) {
return Integer.parseInt(s);
}
public static int bounded(int min, int value, int max) {
return Math.min(Math.max(min, value), max);
}
public static T single(Iterable coll) {
Iterator it = coll.iterator();
must(it.hasNext(), "Expected exactly 1 item, but didn't find any!");
T item = it.next();
must(!it.hasNext(), "Expected exactly 1 item, but found more than 1!");
return item;
}
public static T singleOrNone(Iterable coll) {
Iterator it = coll.iterator();
T item = it.hasNext() ? it.next() : null;
must(!it.hasNext(), "Expected 0 or 1 items, but found more than 1!");
return item;
}
public static T first(T[] values) {
return values != null && values.length > 0 ? values[0] : null;
}
public static T first(List values) {
return values != null && values.size() > 0 ? values.get(0) : null;
}
public static T last(T[] values) {
return values != null && values.length > 0 ? values[values.length - 1] : null;
}
public static T last(List values) {
return values != null && values.size() > 0 ? values.get(values.size() - 1) : null;
}
@SuppressWarnings("unchecked")
public static int compare(T val1, T val2) {
if (val1 == null && val2 == null) {
return 0;
} else if (val1 == null) {
return -1;
} else if (val2 == null) {
return 1;
} else {
return ((Comparable) val1).compareTo(val2);
}
}
public static List range(Iterable items, int fromIndex, int toIndex) {
// TODO more efficient implementation
List list = list(items);
fromIndex = bounded(0, fromIndex, list.size());
toIndex = bounded(fromIndex, toIndex, list.size());
return list(list.subList(fromIndex, toIndex));
}
public static List page(Iterable items, int page, int pageSize) {
return range(items, (page - 1) * pageSize, page * pageSize);
}
public static String trimr(String s, char suffix) {
return (!s.isEmpty() && s.charAt(s.length() - 1) == suffix) ? mid(s, 0, -1) : s;
}
public static String trimr(String s, String suffix) {
return s.endsWith(suffix) ? mid(s, 0, -suffix.length()) : s;
}
public static String triml(String s, char prefix) {
return (!s.isEmpty() && s.charAt(0) == prefix) ? s.substring(1) : s;
}
public static String triml(String s, String prefix) {
return s.startsWith(prefix) ? s.substring(prefix.length()) : s;
}
public static void argMust(boolean expectedCondition, String message, Object... args) {
if (!expectedCondition) {
throw illegalArg(message, args);
}
}
/**
* Sleeps (calling Thread.sleep) for the specified period.
*
* If the thread is interrupted while sleeping, throws {@link CancellationException} to propagate the interruption.
*
* @param millis the length of time to sleep in milliseconds.
*/
public static void sleep(long millis) {
try {
Thread.sleep(millis);
} catch (InterruptedException e) {
throw new CancellationException();
}
}
public static Map autoExpandingMap(final Class clazz) {
return autoExpandingMap(new Mapper() {
@SuppressWarnings("unchecked")
@Override
public V map(K src) throws Exception {
try {
return (V) clazz.newInstance();
} catch (Exception e) {
throw rte(e);
}
}
});
}
@SuppressWarnings("serial")
public static Map autoExpandingMap(final Mapper valueFactory) {
return Collections.synchronizedMap(new HashMap() {
@SuppressWarnings("unchecked")
@Override
public synchronized V get(Object key) {
V val = super.get(key);
if (val == null) {
try {
val = valueFactory.map((K) key);
} catch (Exception e) {
throw rte(e);
}
put((K) key, val);
}
return val;
}
});
}
public static Map> mapOfMaps() {
return autoExpandingMap(new Mapper>() {
@Override
public Map map(K1 src) throws Exception {
return synchronizedMap();
}
});
}
public static Map> mapOfLists() {
return autoExpandingMap(new Mapper>() {
@Override
public List map(K src) throws Exception {
return Collections.synchronizedList(U.list());
}
});
}
public static Map> mapOfSets() {
return autoExpandingMap(new Mapper>() {
@Override
public Set map(K src) throws Exception {
return Collections.synchronizedSet(U.set());
}
});
}
/**
* Simpler casts, less warnings.
*/
@SuppressWarnings("unchecked")
public static T cast(Object value) {
return (T) value;
}
public static void wait(CountDownLatch latch) {
try {
latch.await();
} catch (InterruptedException e) {
throw new CancellationException();
}
}
public static void wait(CountDownLatch latch, long timeout, TimeUnit unit) {
try {
latch.await(timeout, unit);
} catch (InterruptedException e) {
throw new CancellationException();
}
}
@SuppressWarnings("unchecked")
public static T dynamic(final Class targetInterface, final Dynamic dynamic) {
final Object obj = new Object();
InvocationHandler handler = new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (method.getDeclaringClass().equals(Object.class)) {
if (method.getName().equals("toString")) {
return targetInterface.getSimpleName() + "@" + Integer.toHexString(obj.hashCode());
}
return method.invoke(obj, args);
}
return dynamic.call(method, safe(args));
}
};
return ((T) Proxy.newProxyInstance(targetInterface.getClassLoader(), new Class[]{targetInterface}, handler));
}
@SuppressWarnings({"varargs"})
public static boolean isIn(T value, T... candidates) {
for (T candidate : candidates) {
if (eq(value, candidate)) {
return true;
}
}
return false;
}
public static Is is(T value) {
return new Is(value);
}
public static boolean exists(Callable accessChain) {
try {
return accessChain != null && accessChain.call() != null;
} catch (NullPointerException e) {
return false;
} catch (Exception e) {
throw U.rte(e);
}
}
public static String uri(String... parts) {
return "/" + constructPath("/", false, parts);
}
public static String path(String... parts) {
return constructPath(File.separator, true, parts);
}
private static String constructPath(String separator, boolean preserveFirstSegment, String... parts) {
String s = "";
for (int i = 0; i < parts.length; i++) {
String part = U.safe(parts[i]);
// trim '/'s and '\'s
if (!preserveFirstSegment || i > 0) {
part = triml(part, "/");
}
if (!preserveFirstSegment || part.length() > 1 || i > 0) {
part = trimr(part, "/");
part = trimr(part, "\\");
}
if (!U.isEmpty(part)) {
if (!s.isEmpty() && !s.endsWith(separator)) {
s += separator;
}
s += part;
}
}
return s;
}
public static boolean isMap(Object obj) {
return obj instanceof Map;
}
public static boolean isList(Object obj) {
return obj instanceof List;
}
public static boolean isSet(Object obj) {
return obj instanceof Set;
}
public static boolean isCollection(Object obj) {
return obj instanceof Collection;
}
public static void assign(Collection destination, Collection source) {
if (destination != null && source != null) {
destination.clear();
destination.addAll(source);
}
}
public static void assign(Map destination, Map source) {
if (destination != null && source != null) {
destination.clear();
destination.putAll(source);
}
}
public static V get(Map map, K key) {
V value = map.get(key);
notNull(value, "map[%s]", key);
return value;
}
public static V get(Map map, K key, V defaultValue) {
V value = map.get(key);
return value != null ? value : defaultValue;
}
}
