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 }