Rand.java

/**
 * Copyright (C) 2011 Jacob Scott <jascottytechie@gmail.com>
 * Description: provides easy random values
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package me.jascotty2.libv01.util;

import java.util.Date;
import java.util.Random;

public class Rand {

	static final Random rand = new Random();
	static final char[] filenameChars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".toCharArray();
	protected static boolean isRand = false;

	public static String randFname() {
		return randFname(10, 25);
	}

	public static String randFname(int length) {
		return randFname(length, length);
	}

	public static String randFname(int minlength, int maxlength) {
		StringBuilder ret = new StringBuilder();
		for (int i = RandomInt(minlength, maxlength); i > 0; --i) {
			ret.append(filenameChars[RandomInt(0, filenameChars.length - 1)]);
		}
		return ret.toString();
	}

	public static int RandomInt(int min, int max) {
		if (min == max) {
			return min;
		} else if (max < min) {
			return RandomInt(max, min);
		} else if (!isRand) {
			rand.setSeed((new Date()).getTime());
			isRand = true;
		}
		return min + rand.nextInt(max - min + 1);
	}

	public static double RandomDouble() {
		if (!isRand) {
			rand.setSeed((new Date()).getTime());
			isRand = true;
		}
		return rand.nextDouble();
	}

	public static double RandomDouble(double min, double max) {
		if (!isRand) {
			rand.setSeed((new Date()).getTime());
			isRand = true;
		}
		return min + rand.nextDouble() * (max - min);
	}

	public static boolean RandomBoolean() {
		if (!isRand) {
			rand.setSeed((new Date()).getTime());
			isRand = true;
		}
		return rand.nextBoolean();
	}

	public static boolean RandomBoolean(double chance) {
		if (chance >= 1) {
			return true;
		}else if (chance <= 0) {
			return false;
		}else if (!isRand) {
			rand.setSeed((new Date()).getTime());
			isRand = true;
		}
		return rand.nextDouble() <= chance;
	}
} // end class Rand