578 lines
18 KiB
Java
578 lines
18 KiB
Java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.commons.lang3;
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import net.lax1dude.eaglercraft.v1_8.EaglercraftRandom;
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/**
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* <p>
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* Generates random {@code String}s.
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* </p>
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*
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* <p>
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* <b>Caveat: Instances of {@link EaglercraftRandom}, upon which the implementation of this
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* class relies, are not cryptographically secure.</b>
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* </p>
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*
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* <p>
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* RandomStringUtils is intended for simple use cases. For more advanced use
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* cases consider using Apache Commons Text's <a href=
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* "https://commons.apache.org/proper/commons-text/javadocs/api-release/org/apache/commons/text/RandomStringGenerator.html">
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* RandomStringGenerator</a> instead.
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* </p>
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*
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* <p>
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* The Apache Commons project provides
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* <a href="https://commons.apache.org/rng">Commons RNG</a> dedicated to
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* pseudo-random number generation, that may be a better choice for applications
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* with more stringent requirements (performance and/or correctness).
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* </p>
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*
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* <p>
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* Note that <em>private high surrogate</em> characters are ignored. These are
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* Unicode characters that fall between the values 56192 (db80) and 56319 (dbff)
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* as we don't know how to handle them. High and low surrogates are correctly
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* dealt with - that is if a high surrogate is randomly chosen, 55296 (d800) to
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* 56191 (db7f) then it is followed by a low surrogate. If a low surrogate is
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* chosen, 56320 (dc00) to 57343 (dfff) then it is placed after a randomly
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* chosen high surrogate.
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* </p>
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*
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* <p>
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* #ThreadSafe#
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* </p>
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*
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* @since 1.0
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*/
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public class RandomStringUtils {
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/**
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* <p>
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* Random object used by random method. This has to be not local to the random
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* method so as to not return the same value in the same millisecond.
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* </p>
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*/
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private static final EaglercraftRandom RANDOM = new EaglercraftRandom();
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/**
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* <p>
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* {@code RandomStringUtils} instances should NOT be constructed in standard
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* programming. Instead, the class should be used as
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* {@code RandomStringUtils.random(5);}.
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* </p>
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*
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* <p>
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* This constructor is public to permit tools that require a JavaBean instance
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* to operate.
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* </p>
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*/
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public RandomStringUtils() {
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}
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// Random
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// -----------------------------------------------------------------------
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/**
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* <p>
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* Creates a random string whose length is the number of characters specified.
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* </p>
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*
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* <p>
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* Characters will be chosen from the set of all characters.
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* </p>
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*
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* @param count the length of random string to create
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* @return the random string
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*/
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public static String random(final int count) {
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return random(count, false, false);
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}
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/**
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* <p>
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* Creates a random string whose length is the number of characters specified.
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* </p>
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*
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* <p>
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* Characters will be chosen from the set of characters whose ASCII value is
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* between {@code 32} and {@code 126} (inclusive).
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* </p>
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*
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* @param count the length of random string to create
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* @return the random string
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*/
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public static String randomAscii(final int count) {
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return random(count, 32, 127, false, false);
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}
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/**
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* <p>
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* Creates a random string whose length is between the inclusive minimum and the
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* exclusive maximum.
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* </p>
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*
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* <p>
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* Characters will be chosen from the set of characters whose ASCII value is
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* between {@code 32} and {@code 126} (inclusive).
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* </p>
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*
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* @param minLengthInclusive the inclusive minimum length of the string to
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* generate
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* @param maxLengthExclusive the exclusive maximum length of the string to
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* generate
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* @return the random string
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* @since 3.5
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*/
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public static String randomAscii(final int minLengthInclusive, final int maxLengthExclusive) {
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return randomAscii(RandomUtils.nextInt(minLengthInclusive, maxLengthExclusive));
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}
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/**
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* <p>
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* Creates a random string whose length is the number of characters specified.
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* </p>
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*
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* <p>
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* Characters will be chosen from the set of Latin alphabetic characters (a-z,
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* A-Z).
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* </p>
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*
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* @param count the length of random string to create
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* @return the random string
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*/
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public static String randomAlphabetic(final int count) {
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return random(count, true, false);
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}
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/**
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* <p>
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* Creates a random string whose length is between the inclusive minimum and the
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* exclusive maximum.
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* </p>
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*
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* <p>
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* Characters will be chosen from the set of Latin alphabetic characters (a-z,
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* A-Z).
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* </p>
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*
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* @param minLengthInclusive the inclusive minimum length of the string to
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* generate
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* @param maxLengthExclusive the exclusive maximum length of the string to
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* generate
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* @return the random string
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* @since 3.5
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*/
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public static String randomAlphabetic(final int minLengthInclusive, final int maxLengthExclusive) {
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return randomAlphabetic(RandomUtils.nextInt(minLengthInclusive, maxLengthExclusive));
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}
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/**
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* <p>
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* Creates a random string whose length is the number of characters specified.
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* </p>
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*
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* <p>
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* Characters will be chosen from the set of Latin alphabetic characters (a-z,
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* A-Z) and the digits 0-9.
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* </p>
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*
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* @param count the length of random string to create
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* @return the random string
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*/
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public static String randomAlphanumeric(final int count) {
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return random(count, true, true);
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}
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/**
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* <p>
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* Creates a random string whose length is between the inclusive minimum and the
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* exclusive maximum.
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* </p>
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*
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* <p>
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* Characters will be chosen from the set of Latin alphabetic characters (a-z,
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* A-Z) and the digits 0-9.
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* </p>
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*
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* @param minLengthInclusive the inclusive minimum length of the string to
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* generate
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* @param maxLengthExclusive the exclusive maximum length of the string to
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* generate
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* @return the random string
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* @since 3.5
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*/
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public static String randomAlphanumeric(final int minLengthInclusive, final int maxLengthExclusive) {
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return randomAlphanumeric(RandomUtils.nextInt(minLengthInclusive, maxLengthExclusive));
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}
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/**
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* <p>
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* Creates a random string whose length is the number of characters specified.
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* </p>
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*
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* <p>
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* Characters will be chosen from the set of characters which match the POSIX
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* [:graph:] regular expression character class. This class contains all visible
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* ASCII characters (i.e. anything except spaces and control characters).
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* </p>
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*
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* @param count the length of random string to create
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* @return the random string
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* @since 3.5
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*/
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public static String randomGraph(final int count) {
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return random(count, 33, 126, false, false);
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}
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/**
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* <p>
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* Creates a random string whose length is between the inclusive minimum and the
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* exclusive maximum.
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* </p>
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*
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* <p>
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* Characters will be chosen from the set of \p{Graph} characters.
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* </p>
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*
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* @param minLengthInclusive the inclusive minimum length of the string to
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* generate
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* @param maxLengthExclusive the exclusive maximum length of the string to
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* generate
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* @return the random string
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* @since 3.5
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*/
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public static String randomGraph(final int minLengthInclusive, final int maxLengthExclusive) {
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return randomGraph(RandomUtils.nextInt(minLengthInclusive, maxLengthExclusive));
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}
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/**
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* <p>
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* Creates a random string whose length is the number of characters specified.
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* </p>
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*
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* <p>
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* Characters will be chosen from the set of numeric characters.
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* </p>
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*
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* @param count the length of random string to create
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* @return the random string
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*/
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public static String randomNumeric(final int count) {
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return random(count, false, true);
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}
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/**
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* <p>
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* Creates a random string whose length is between the inclusive minimum and the
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* exclusive maximum.
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* </p>
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*
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* <p>
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* Characters will be chosen from the set of \p{Digit} characters.
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* </p>
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*
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* @param minLengthInclusive the inclusive minimum length of the string to
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* generate
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* @param maxLengthExclusive the exclusive maximum length of the string to
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* generate
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* @return the random string
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* @since 3.5
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*/
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public static String randomNumeric(final int minLengthInclusive, final int maxLengthExclusive) {
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return randomNumeric(RandomUtils.nextInt(minLengthInclusive, maxLengthExclusive));
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}
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/**
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* <p>
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* Creates a random string whose length is the number of characters specified.
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* </p>
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*
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* <p>
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* Characters will be chosen from the set of characters which match the POSIX
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* [:print:] regular expression character class. This class includes all visible
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* ASCII characters and spaces (i.e. anything except control characters).
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* </p>
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*
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* @param count the length of random string to create
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* @return the random string
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* @since 3.5
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*/
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public static String randomPrint(final int count) {
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return random(count, 32, 126, false, false);
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}
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/**
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* <p>
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* Creates a random string whose length is between the inclusive minimum and the
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* exclusive maximum.
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* </p>
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*
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* <p>
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* Characters will be chosen from the set of \p{Print} characters.
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* </p>
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*
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* @param minLengthInclusive the inclusive minimum length of the string to
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* generate
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* @param maxLengthExclusive the exclusive maximum length of the string to
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* generate
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* @return the random string
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* @since 3.5
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*/
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public static String randomPrint(final int minLengthInclusive, final int maxLengthExclusive) {
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return randomPrint(RandomUtils.nextInt(minLengthInclusive, maxLengthExclusive));
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}
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/**
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* <p>
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* Creates a random string whose length is the number of characters specified.
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* </p>
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*
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* <p>
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* Characters will be chosen from the set of alpha-numeric characters as
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* indicated by the arguments.
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* </p>
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*
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* @param count the length of random string to create
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* @param letters if {@code true}, generated string may include alphabetic
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* characters
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* @param numbers if {@code true}, generated string may include numeric
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* characters
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* @return the random string
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*/
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public static String random(final int count, final boolean letters, final boolean numbers) {
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return random(count, 0, 0, letters, numbers);
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}
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/**
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* <p>
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* Creates a random string whose length is the number of characters specified.
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* </p>
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*
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* <p>
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* Characters will be chosen from the set of alpha-numeric characters as
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* indicated by the arguments.
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* </p>
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*
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* @param count the length of random string to create
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* @param start the position in set of chars to start at
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* @param end the position in set of chars to end before
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* @param letters if {@code true}, generated string may include alphabetic
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* characters
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* @param numbers if {@code true}, generated string may include numeric
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* characters
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* @return the random string
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*/
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public static String random(final int count, final int start, final int end, final boolean letters,
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final boolean numbers) {
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return random(count, start, end, letters, numbers, null, RANDOM);
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}
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/**
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* <p>
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* Creates a random string based on a variety of options, using default source
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* of randomness.
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* </p>
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*
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* <p>
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* This method has exactly the same semantics as
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* {@link #random(int,int,int,boolean,boolean,char[],EaglercraftRandom)}, but instead of
|
||
|
|
* using an externally supplied source of randomness, it uses the internal
|
||
|
|
* static {@link EaglercraftRandom} instance.
|
||
|
|
* </p>
|
||
|
|
*
|
||
|
|
* @param count the length of random string to create
|
||
|
|
* @param start the position in set of chars to start at
|
||
|
|
* @param end the position in set of chars to end before
|
||
|
|
* @param letters if {@code true}, generated string may include alphabetic
|
||
|
|
* characters
|
||
|
|
* @param numbers if {@code true}, generated string may include numeric
|
||
|
|
* characters
|
||
|
|
* @param chars the set of chars to choose randoms from. If {@code null}, then
|
||
|
|
* it will use the set of all chars.
|
||
|
|
* @return the random string
|
||
|
|
* @throws ArrayIndexOutOfBoundsException if there are not
|
||
|
|
* {@code (end - start) + 1} characters
|
||
|
|
* in the set array.
|
||
|
|
*/
|
||
|
|
public static String random(final int count, final int start, final int end, final boolean letters,
|
||
|
|
final boolean numbers, final char... chars) {
|
||
|
|
return random(count, start, end, letters, numbers, chars, RANDOM);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* <p>
|
||
|
|
* Creates a random string based on a variety of options, using supplied source
|
||
|
|
* of randomness.
|
||
|
|
* </p>
|
||
|
|
*
|
||
|
|
* <p>
|
||
|
|
* If start and end are both {@code 0}, start and end are set to {@code ' '} and
|
||
|
|
* {@code 'z'}, the ASCII printable characters, will be used, unless letters and
|
||
|
|
* numbers are both {@code false}, in which case, start and end are set to
|
||
|
|
* {@code 0} and {@link Character#MAX_CODE_POINT}.
|
||
|
|
*
|
||
|
|
* <p>
|
||
|
|
* If set is not {@code null}, characters between start and end are chosen.
|
||
|
|
* </p>
|
||
|
|
*
|
||
|
|
* <p>
|
||
|
|
* This method accepts a user-supplied {@link EaglercraftRandom} instance to use as a
|
||
|
|
* source of randomness. By seeding a single {@link EaglercraftRandom} instance with a
|
||
|
|
* fixed seed and using it for each call, the same random sequence of strings
|
||
|
|
* can be generated repeatedly and predictably.
|
||
|
|
* </p>
|
||
|
|
*
|
||
|
|
* @param count the length of random string to create
|
||
|
|
* @param start the position in set of chars to start at (inclusive)
|
||
|
|
* @param end the position in set of chars to end before (exclusive)
|
||
|
|
* @param letters if {@code true}, generated string may include alphabetic
|
||
|
|
* characters
|
||
|
|
* @param numbers if {@code true}, generated string may include numeric
|
||
|
|
* characters
|
||
|
|
* @param chars the set of chars to choose randoms from, must not be empty. If
|
||
|
|
* {@code null}, then it will use the set of all chars.
|
||
|
|
* @param random a source of randomness.
|
||
|
|
* @return the random string
|
||
|
|
* @throws ArrayIndexOutOfBoundsException if there are not
|
||
|
|
* {@code (end - start) + 1} characters
|
||
|
|
* in the set array.
|
||
|
|
* @throws IllegalArgumentException if {@code count} < 0 or the
|
||
|
|
* provided chars array is empty.
|
||
|
|
* @since 2.0
|
||
|
|
*/
|
||
|
|
public static String random(int count, int start, int end, final boolean letters, final boolean numbers,
|
||
|
|
final char[] chars, final EaglercraftRandom random) {
|
||
|
|
if (count == 0) {
|
||
|
|
return StringUtils.EMPTY;
|
||
|
|
} else if (count < 0) {
|
||
|
|
throw new IllegalArgumentException("Requested random string length " + count + " is less than 0.");
|
||
|
|
}
|
||
|
|
if (chars != null && chars.length == 0) {
|
||
|
|
throw new IllegalArgumentException("The chars array must not be empty");
|
||
|
|
}
|
||
|
|
|
||
|
|
if (start == 0 && end == 0) {
|
||
|
|
if (chars != null) {
|
||
|
|
end = chars.length;
|
||
|
|
} else if (!letters && !numbers) {
|
||
|
|
end = Character.MAX_CODE_POINT;
|
||
|
|
} else {
|
||
|
|
end = 'z' + 1;
|
||
|
|
start = ' ';
|
||
|
|
}
|
||
|
|
} else if (end <= start) {
|
||
|
|
throw new IllegalArgumentException(
|
||
|
|
"Parameter end (" + end + ") must be greater than start (" + start + ")");
|
||
|
|
}
|
||
|
|
|
||
|
|
final int zero_digit_ascii = 48;
|
||
|
|
final int first_letter_ascii = 65;
|
||
|
|
|
||
|
|
if (chars == null && (numbers && end <= zero_digit_ascii || letters && end <= first_letter_ascii)) {
|
||
|
|
throw new IllegalArgumentException(
|
||
|
|
"Parameter end (" + end + ") must be greater then (" + zero_digit_ascii + ") for generating digits "
|
||
|
|
+ "or greater then (" + first_letter_ascii + ") for generating letters.");
|
||
|
|
}
|
||
|
|
|
||
|
|
final StringBuilder builder = new StringBuilder(count);
|
||
|
|
final int gap = end - start;
|
||
|
|
|
||
|
|
while (count-- != 0) {
|
||
|
|
final int codePoint;
|
||
|
|
if (chars == null) {
|
||
|
|
codePoint = random.nextInt(gap) + start;
|
||
|
|
|
||
|
|
switch (Character.getType(codePoint)) {
|
||
|
|
case Character.UNASSIGNED:
|
||
|
|
case Character.PRIVATE_USE:
|
||
|
|
case Character.SURROGATE:
|
||
|
|
count++;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
} else {
|
||
|
|
codePoint = chars[random.nextInt(gap) + start];
|
||
|
|
}
|
||
|
|
|
||
|
|
final int numberOfChars = Character.charCount(codePoint);
|
||
|
|
if (count == 0 && numberOfChars > 1) {
|
||
|
|
count++;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (letters && Character.isLetter(codePoint) || numbers && Character.isDigit(codePoint)
|
||
|
|
|| !letters && !numbers) {
|
||
|
|
builder.appendCodePoint(codePoint);
|
||
|
|
|
||
|
|
if (numberOfChars == 2) {
|
||
|
|
count--;
|
||
|
|
}
|
||
|
|
|
||
|
|
} else {
|
||
|
|
count++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return builder.toString();
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* <p>
|
||
|
|
* Creates a random string whose length is the number of characters specified.
|
||
|
|
* </p>
|
||
|
|
*
|
||
|
|
* <p>
|
||
|
|
* Characters will be chosen from the set of characters specified by the string,
|
||
|
|
* must not be empty. If null, the set of all characters is used.
|
||
|
|
* </p>
|
||
|
|
*
|
||
|
|
* @param count the length of random string to create
|
||
|
|
* @param chars the String containing the set of characters to use, may be null,
|
||
|
|
* but must not be empty
|
||
|
|
* @return the random string
|
||
|
|
* @throws IllegalArgumentException if {@code count} < 0 or the string is
|
||
|
|
* empty.
|
||
|
|
*/
|
||
|
|
public static String random(final int count, final String chars) {
|
||
|
|
if (chars == null) {
|
||
|
|
return random(count, 0, 0, false, false, null, RANDOM);
|
||
|
|
}
|
||
|
|
return random(count, chars.toCharArray());
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* <p>
|
||
|
|
* Creates a random string whose length is the number of characters specified.
|
||
|
|
* </p>
|
||
|
|
*
|
||
|
|
* <p>
|
||
|
|
* Characters will be chosen from the set of characters specified.
|
||
|
|
* </p>
|
||
|
|
*
|
||
|
|
* @param count the length of random string to create
|
||
|
|
* @param chars the character array containing the set of characters to use, may
|
||
|
|
* be null
|
||
|
|
* @return the random string
|
||
|
|
* @throws IllegalArgumentException if {@code count} < 0.
|
||
|
|
*/
|
||
|
|
public static String random(final int count, final char... chars) {
|
||
|
|
if (chars == null) {
|
||
|
|
return random(count, 0, 0, false, false, null, RANDOM);
|
||
|
|
}
|
||
|
|
return random(count, 0, chars.length, false, false, chars, RANDOM);
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|