com.fitbur.bytebuddy.utility.RandomString Maven / Gradle / Ivy
package com.fitbur.bytebuddy.utility;
import java.util.Random;
/**
* A provider of randomized {@link java.lang.String} values.
*/
public class RandomString {
/**
* The default length of a randomized {@link java.lang.String}.
*/
public static final int DEFAULT_LENGTH = 8;
/**
* The symbols which are used to create a random {@link java.lang.String}.
*/
private static final char[] SYMBOL;
/*
* Creates the symbol array.
*/
static {
StringBuilder symbol = new StringBuilder();
for (char character = '0'; character <= '9'; character++) {
symbol.append(character);
}
for (char character = 'a'; character <= 'z'; character++) {
symbol.append(character);
}
for (char character = 'A'; character <= 'Z'; character++) {
symbol.append(character);
}
SYMBOL = symbol.toString().toCharArray();
}
/**
* A provider of random values.
*/
private final Random random;
/**
* The length of the random strings that are created by this instance.
*/
private final int length;
/**
* Creates a random {@link java.lang.String} provider where each {@link java.lang.String} is of
* {@link com.fitbur.bytebuddy.utility.RandomString#DEFAULT_LENGTH} length.
*/
public RandomString() {
this(DEFAULT_LENGTH);
}
/**
* Creates a random {@link java.lang.String} provider where each value is of the given length.
*
* @param length The length of the random {@link String}.
*/
public RandomString(int length) {
if (length <= 0) {
throw new IllegalArgumentException("A random string's length cannot be zero or negative");
}
this.length = length;
random = new Random();
}
/**
* Creates a random {@link java.lang.String} of {@link com.fitbur.bytebuddy.utility.RandomString#DEFAULT_LENGTH} length.
*
* @return A random {@link java.lang.String}.
*/
public static String make() {
return make(DEFAULT_LENGTH);
}
/**
* Creates a random {@link java.lang.String} of the given {@code length}.
*
* @param length The length of the random {@link String}.
* @return A random {@link java.lang.String}.
*/
public static String make(int length) {
return new RandomString(length).nextString();
}
/**
* Creates a new random {@link java.lang.String}.
*
* @return A random {@link java.lang.String} of the given length for this instance.
*/
public String nextString() {
char[] buffer = new char[length];
for (int index = 0; index < length; index++) {
buffer[index] = SYMBOL[random.nextInt(SYMBOL.length)];
}
return new String(buffer);
}
@Override
public String toString() {
return "RandomString{" +
"random=" + random +
", length=" + length +
'}';
}
}