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 }