/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.commons.lang3;
import java.util.Random;
/**
* <p>Operations for random {@code String}s.</p>
* <p>Currently <em>private high surrogate</em> characters are ignored.
* These are Unicode characters that fall between the values 56192 (db80)
* and 56319 (dbff) as we don't know how to handle them.
* High and low surrogates are correctly dealt with - that is if a
* high surrogate is randomly chosen, 55296 (d800) to 56191 (db7f)
* then it is followed by a low surrogate. If a low surrogate is chosen,
* 56320 (dc00) to 57343 (dfff) then it is placed after a randomly
* chosen high surrogate. </p>
*
* <p>#ThreadSafe#</p>
* @since 1.0
* @version $Id: RandomStringUtils.java 1199894 2011-11-09 17:53:59Z ggregory $
*/
public class RandomStringUtils {
/**
* <p>Random object used by random method. This has to be not local
* to the random method so as to not return the same value in the
* same millisecond.</p>
*/
private static final Random RANDOM = new Random();
/**
* <p>{@code RandomStringUtils} instances should NOT be constructed in
* standard programming. Instead, the class should be used as
* {@code RandomStringUtils.random(5);}.</p>
*
* <p>This constructor is public to permit tools that require a JavaBean instance
* to operate.</p>
*/
public RandomStringUtils() {
super();
}
// Random
//-----------------------------------------------------------------------
/**
* <p>Creates a random string whose length is the number of characters
* specified.</p>
*
* <p>Characters will be chosen from the set of all characters.</p>
*
* @param count the length of random string to create
* @return the random string
*/
public static String random(int count) {
return random(count, false, false);
}
/**
* <p>Creates a random string whose length is the number of characters
* specified.</p>
*
* <p>Characters will be chosen from the set of characters whose
* ASCII value is between {@code 32} and {@code 126} (inclusive).</p>
*
* @param count the length of random string to create
* @return the random string
*/
public static String randomAscii(int count) {
return random(count, 32, 127, false, false);
}
/**
* <p>Creates a random string whose length is the number of characters
* specified.</p>
*
* <p>Characters will be chosen from the set of alphabetic
* characters.</p>
*
* @param count the length of random string to create
* @return the random string
*/
public static String randomAlphabetic(int count) {
return random(count, true, false);
}
/**
* <p>Creates a random string whose length is the number of characters
* specified.</p>
*
* <p>Characters will be chosen from the set of alpha-numeric
* characters.</p>
*
* @param count the length of random string to create
* @return the random string
*/
public static String randomAlphanumeric(int count) {
return random(count, true, true);
}
/**
* <p>Creates a random string whose length is the number of characters
* specified.</p>
*
* <p>Characters will be chosen from the set of numeric
* characters.</p>
*
* @param count the length of random string to create
* @return the random string
*/
public static String randomNumeric(int count) {
return random(count, false, true);
}
/**
* <p>Creates a random string whose length is the number of characters
* specified.</p>
*
* <p>Characters will be chosen from the set of alpha-numeric
* characters as indicated by the arguments.</p>
*
* @param count the length of random string to create
* @param letters if {@code true}, generated string will include
* alphabetic characters
* @param numbers if {@code true}, generated string will include
* numeric characters
* @return the random string
*/
public static String random(int count, boolean letters, boolean numbers) {
return random(count, 0, 0, letters, numbers);
}
/**
* <p>Creates a random string whose length is the number of characters
* specified.</p>
*
* <p>Characters will be chosen from the set of alpha-numeric
* characters as indicated by the arguments.</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 will include
* alphabetic characters
* @param numbers if {@code true}, generated string will include
* numeric characters
* @return the random string
*/
public static String random(int count, int start, int end, boolean letters, boolean numbers) {
return random(count, start, end, letters, numbers, null, RANDOM);
}
/**
* <p>Creates a random string based on a variety of options, using
* default source of randomness.</p>
*
* <p>This method has exactly the same semantics as
* {@link #random(int,int,int,boolean,boolean,char[],Random)}, but
* instead of using an externally supplied source of randomness, it uses
* the internal static {@link Random} 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 only allow letters?
* @param numbers only allow numbers?
* @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(int count, int start, int end, boolean letters, boolean numbers, 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 {@code Integer.MAX_VALUE}.
*
* <p>If set is not {@code null}, characters between start and
* end are chosen.</p>
*
* <p>This method accepts a user-supplied {@link Random}
* instance to use as a source of randomness. By seeding a single
* {@link Random} 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
* @param end the position in set of chars to end before
* @param letters only allow letters?
* @param numbers only allow numbers?
* @param chars the set of chars to choose randoms from.
* 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.
* @since 2.0
*/
public static String random(int count, int start, int end, boolean letters, boolean numbers,
char[] chars, Random random) {
if (count == 0) {
return "";
} else if (count < 0) {
throw new IllegalArgumentException("Requested random string length " + count + " is less than 0.");
}
if (start == 0 && end == 0) {
end = 'z' + 1;
start = ' ';
if (!letters && !numbers) {
start = 0;
end = Integer.MAX_VALUE;
}
}
char[] buffer = new char[count];
int gap = end - start;
while (count-- != 0) {
char ch;
if (chars == null) {
ch = (char) (random.nextInt(gap) + start);
} else {
ch = chars[random.nextInt(gap) + start];
}
if (letters && Character.isLetter(ch)
|| numbers && Character.isDigit(ch)
|| !letters && !numbers) {
if(ch >= 56320 && ch <= 57343) {
if(count == 0) {
count++;
} else {
// low surrogate, insert high surrogate after putting it in
buffer[count] = ch;
count--;
buffer[count] = (char) (55296 + random.nextInt(128));
}
} else if(ch >= 55296 && ch <= 56191) {
if(count == 0) {
count++;
} else {
// high surrogate, insert low surrogate before putting it in
buffer[count] = (char) (56320 + random.nextInt(128));
count--;
buffer[count] = ch;
}
} else if(ch >= 56192 && ch <= 56319) {
// private high surrogate, no effing clue, so skip it
count++;
} else {
buffer[count] = ch;
}
} else {
count++;
}
}
return new String(buffer);
}
/**
* <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 String containing the set of characters to use,
* may be null
* @return the random string
* @throws IllegalArgumentException if {@code count} < 0.
*/
public static String random(int count, 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(int count, char... chars) {
if (chars == null) {
return random(count, 0, 0, false, false, null, RANDOM);
}
return random(count, 0, chars.length, false, false, chars, RANDOM);
}
}