1 /*
   2  * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package vm.compiler.coverage.parentheses.share.generation;
  24 
  25 import java.util.Random;
  26 
  27 
  28 /**
  29  * This class generate rrandom ight parentheses sequence in string representation: "(())", "()(())" etc
  30  */
  31 public class ParenthesesGenerator {
  32     private static Random random = new Random();
  33 
  34     public static String generate(int size) {
  35         if (size == 0) {
  36             return "";
  37         }
  38         if (random.nextBoolean()) {
  39             return "(" + generate(size - 1) + ")";
  40         } else {
  41             int splitPoint = random.nextInt(size + 1);
  42             return generate(splitPoint) + generate(size - splitPoint);
  43         }
  44     }
  45 }