1 /* 2 * Copyright (c) 2011, 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 24 package vm.mlvm.meth.share; 25 26 public class RandomValueGen { 27 28 private static final int MAX_DISTINCT_TRIES = 11; 29 30 /* 31 * Primitive values are returned boxed. void is returned as null String 32 * contains 0..100 random characters 33 */ 34 public static Object next(Class<?> type) throws InstantiationException, IllegalAccessException { 35 return TestTypes.nextRandomValueForType(type); 36 } 37 38 public static Object nextDistinct(Class<?> type, Object notEqualTo) throws InstantiationException, IllegalAccessException { 39 Object nonEqualValue; 40 for ( int i = MAX_DISTINCT_TRIES; i > 0; i -- ){ 41 nonEqualValue = next(type); 42 if ( ! nonEqualValue.equals(notEqualTo) ) 43 return nonEqualValue; 44 } 45 46 // A workaround for booleans. Sometimes RNG produces long series of trues or falses 47 if ( type.equals(Boolean.class) || type.equals(boolean.class) ) 48 return new Boolean(! (Boolean) notEqualTo); 49 50 throw new InstantiationException("Can't create distinct value for type=[" + type.getName() + "]; value=[" + notEqualTo + "]"); 51 } 52 53 public static void main(String[] args) { 54 for (int i = 0; i < 10; i++) { 55 Class<?> type = RandomTypeGen.next(); 56 Object value; 57 try { 58 value = next(type); 59 System.out.println("type=[" + type + "], value=[" + value + "]"); 60 } catch (Exception e) { 61 System.err.println("type=[" + type + "]"); 62 e.printStackTrace(); 63 } 64 } 65 } 66 67 68 }