org.omnifaces.utils.Lang Maven / Gradle / Ivy
/*
* Copyright 2018 OmniFaces
*
* 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.
*/
package org.omnifaces.utils;
import static java.lang.Character.isSpaceChar;
import static java.lang.Character.toLowerCase;
import static java.lang.Character.toUpperCase;
import java.io.IOException;
import java.lang.reflect.Array;
import java.text.Normalizer;
import java.text.Normalizer.Form;
import java.util.Collection;
import java.util.Map;
import java.util.Optional;
import java.util.Properties;
import java.util.function.Consumer;
import java.util.function.Supplier;
public final class Lang {
private Lang() {
}
/**
* Returns true if the given string is null or is empty.
*
* @param string The string to be checked on emptiness.
* @return true if the given string is null or is empty.
*/
public static boolean isEmpty(String string) {
return string == null || string.isEmpty();
}
/**
* Returns true if the given array is null or is empty.
*
* @param array The array to be checked on emptiness.
* @return true if the given array is null or is empty.
*/
public static boolean isEmpty(Object[] array) {
return array == null || array.length == 0;
}
/**
* Returns true if the given collection is null or is empty.
*
* @param collection The collection to be checked on emptiness.
* @return true if the given collection is null or is empty.
*/
public static boolean isEmpty(Collection collection) {
return collection == null || collection.isEmpty();
}
/**
* Returns true if the given map is null or is empty.
*
* @param map The map to be checked on emptiness.
* @return true if the given map is null or is empty.
*/
public static boolean isEmpty(Map map) {
return map == null || map.isEmpty();
}
/**
* Returns true if the given value is null or is empty. Types of String, Collection, Map, Optional and Array are
* recognized. If none is recognized, then examine the emptiness of the toString() representation instead.
*
* @param value The value to be checked on emptiness.
* @return true if the given value is null or is empty.
*/
public static boolean isEmpty(Object value) {
if (value == null) {
return true;
}
else if (value instanceof String) {
return ((String) value).isEmpty();
}
else if (value instanceof Collection) {
return ((Collection) value).isEmpty();
}
else if (value instanceof Map) {
return ((Map) value).isEmpty();
}
else if (value instanceof Optional) {
return !((Optional)value).isPresent();
}
else if (value.getClass().isArray()) {
return Array.getLength(value) == 0;
}
else {
return value.toString() == null || value.toString().isEmpty();
}
}
/**
* Returns true if all values are empty, false if at least one value is not empty.
* @param values the values to be checked on emptiness
* @return True if all values are empty, false otherwise
*/
public static boolean isAllEmpty(Object... values) {
for (Object value : values) {
if (!isEmpty(value)) {
return false;
}
}
return true;
}
/**
* Returns true if at least one value is empty.
*
* @param values the values to be checked on emptiness
* @return true if any value is empty and false if no values are empty
*/
public static boolean isAnyEmpty(Object... values) {
for (Object value : values) {
if (isEmpty(value)) {
return true;
}
}
return false;
}
public static boolean isNotBlank(String string) {
return string != null && !string.trim().isEmpty();
}
public static T requireNotEmpty(T value, Supplier exceptionSupplier) throws E {
if (isEmpty(value)) {
throw exceptionSupplier.get();
}
return value;
}
public static T ifEmptyGet(T value, Supplier defaultSupplier) {
if (isEmpty(value)) {
return defaultSupplier.get();
}
return value;
}
/**
* Call the given setter with the given value if {@link #isEmpty(Object)} returns false for the given value.
*
* @param value the value to set
* @param setter a consumer that calls the setter with the value
* @param the generic type of the value
*/
public static void setIfNotEmpty(T value, Consumer setter) {
if (!isEmpty(value)) {
setter.accept(value);
}
}
/**
* Returns the first non-null object of the argument list, or null if there is no such element.
*
* @param The generic object type.
* @param objects The argument list of objects to be tested for non-null.
* @return The first non-null object of the argument list, or null if there is no such element.
*/
@SafeVarargs
public static T coalesce(T... objects) {
for (T object : objects) {
if (object != null) {
return object;
}
}
return null;
}
/**
* Returns true if the given object equals one of the given objects.
*
* @param The generic object type.
* @param object The object to be checked if it equals one of the given objects.
* @param objects The argument list of objects to be tested for equality.
* @return true if the given object equals one of the given objects.
*/
@SafeVarargs
public static boolean isOneOf(T object, T... objects) {
for (Object other : objects) {
if (object == null ? other == null : object.equals(other)) {
return true;
}
}
return false;
}
/**
* Returns true if the given string starts with one of the given prefixes.
* @param string The string to be checked if it starts with one of the given prefixes.
* @param prefixes The argument list of prefixes to be checked.
* @return true if the given string starts with one of the given prefixes.
*/
public static boolean startsWithOneOf(String string, String... prefixes) {
for (String prefix : prefixes) {
if (string.startsWith(prefix)) {
return true;
}
}
return false;
}
/**
* Returns true if the given string ends with one of the given suffixes.
* @param string The string to be checked if it ends with one of the given suffixes.
* @param suffixes The argument list of suffixes to be checked.
* @return true if the given string ends with one of the given suffixes.
*/
public static boolean endsWithOneOf(String string, String... suffixes) {
for (String suffix : suffixes) {
if (string.endsWith(suffix)) {
return true;
}
}
return false;
}
/**
* Replaces the last substring of given string that matches the given regular expression with the given replacement.
* @param string The string to be replaced.
* @param regex The regular expression to which given string is to be matched.
* @param replacement The string to be substituted for the last match.
* @return The resulting string.
* @author http://stackoverflow.com/a/2282998
*/
public static String replaceLast(String string, String regex, String replacement) {
return string.replaceFirst("(?s)(.*)" + regex, "$1" + replacement);
}
/**
* Returns true if the given string contains any ISO control characters.
*
* @param string the string to check for control characters
* @return true if the string contains any ISO control characters and false otherwise
*/
public static boolean containsIsoControlCharacters(String string) {
return string.codePoints().anyMatch(Character::isISOControl);
}
/**
* Converts the first character of given string to upper case.
* @param string String to be capitalized.
* @return The given string capitalized.
*/
public static String capitalize(String string) {
if (string == null || string.isEmpty()) {
return string;
}
return toUpperCase(string.charAt(0)) + string.substring(1);
}
/**
* Converts given string to title case.
* @param string String to be converted to title case.
* @return The given string converted to title case.
*/
public static String toTitleCase(String string) {
if (string == null) {
return null;
}
return string.codePoints().collect(StringBuilder::new, (sb, cp) -> {
sb.appendCodePoint(sb.length() == 0 || isSpaceChar(sb.charAt(sb.length() - 1)) ? toUpperCase(cp) : toLowerCase(cp));
}, (sb1, sb2) -> {}).toString();
}
/**
* Converts given string to URL safe format, also called a "slug".
* @param string String to be converted to URL safe format.
* @return The given string converted to URL safe format.
*/
public static String toUrlSafe(String string) {
if (string == null) {
return null;
}
return Normalizer.normalize(string.trim(), Form.NFD)
.replaceAll("\\p{InCombiningDiacriticalMarks}+", "")
.replaceAll("[^\\p{Alnum}]+", "-")
.replaceAll("(^-|-$)", "");
}
/**
* Escape given string as valid {@link Properties} entry value.
* @param string String to be escaped as valid {@link Properties} entry value.
* @return The given string escaped as valid {@link Properties} entry value.
* @throws IOException When appending a character fails.
*/
public static String escapeAsProperty(String string) throws IOException {
Appendable builder = new StringBuilder(string.length());
for (char c : string.toCharArray()) {
if ((c > 61) && (c < 127)) {
if (c == '\\') {
builder.append('\\');
builder.append('\\');
continue;
}
builder.append(c);
continue;
}
switch(c) {
case '\t':builder.append('\\'); builder.append('t');
break;
case '\n':builder.append('\\'); builder.append('n');
break;
case '\r':builder.append('\\'); builder.append('r');
break;
case '\f':builder.append('\\'); builder.append('f');
break;
case '=': // Fall through
case ':':
builder.append('\\'); builder.append(c);
break;
default:
if ((c < 0x0020) || (c > 0x007e)) {
builder.append(String.format("\\u%04x", (int) c));
} else {
builder.append(c);
}
}
}
return builder.toString();
}
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