1 /*
   2  * Copyright (c) 2005, 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 /*
  25  * @test
  26  * @bug     6267846 6275009
  27  * @summary Test Collections.nCopies
  28  * @author  Martin Buchholz
  29  */
  30 
  31 import java.util.Collections;
  32 import java.util.List;
  33 
  34 public class NCopies {
  35     static volatile int passed = 0, failed = 0;
  36 
  37     static void fail(String msg) {
  38         failed++;
  39         new AssertionError(msg).printStackTrace();
  40     }
  41 
  42     static void pass() {
  43         passed++;
  44     }
  45 
  46     static void unexpected(Throwable t) {
  47         failed++;
  48         t.printStackTrace();
  49     }
  50 
  51     static void check(boolean condition, String msg) {
  52         if (condition)
  53             passed++;
  54         else
  55             fail(msg);
  56     }
  57 
  58     static void check(boolean condition) {
  59         check(condition, "Assertion failure");
  60     }
  61 
  62     private static void checkEmpty(List<String> x) {
  63             check(x.isEmpty());
  64             check(x.size() == 0);
  65             check(x.indexOf("foo") == -1);
  66             check(x.lastIndexOf("foo") == -1);
  67             check(x.toArray().length == 0);
  68             check(x.toArray().getClass() == Object[].class);
  69     }
  70 
  71     private static void checkFoos(List<String> x) {
  72             check(! x.isEmpty());
  73             check(x.indexOf(new String("foo")) == 0);
  74             check(x.lastIndexOf(new String("foo")) == x.size()-1);
  75             check(x.toArray().length == x.size());
  76             check(x.toArray().getClass() == Object[].class);
  77             String[] sa = x.toArray(new String[x.size()]);
  78             check(sa.getClass() == String[].class);
  79             check(sa[0].equals("foo"));
  80             check(sa[sa.length-1].equals("foo"));
  81             check(x.get(x.size()/2).equals("foo"));
  82             checkEmpty(x.subList(x.size()/2, x.size()/2));
  83     }
  84 
  85     public static void main(String[] args) {
  86         try {
  87             List<String> empty = Collections.nCopies(0, "foo");
  88             checkEmpty(empty);
  89             checkEmpty(empty.subList(0,0));
  90 
  91             List<String> foos = Collections.nCopies(42, "foo");
  92             check(foos.size() == 42);
  93             checkFoos(foos.subList(foos.size()/2, foos.size()-1));
  94 
  95         } catch (Throwable t) { unexpected(t); }
  96 
  97         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
  98         if (failed > 0) throw new Error("Some tests failed");
  99     }
 100 }