1 /*
   2  * Copyright (c) 2013, 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 8014854
  27  * @summary Exercises CharBuffer#chars on each of the CharBuffer types
  28  * @run testng Chars
  29  * @key randomness
  30  */
  31 
  32 import java.nio.ByteBuffer;
  33 import java.nio.ByteOrder;
  34 import java.nio.CharBuffer;
  35 import java.util.ArrayList;
  36 import java.util.List;
  37 import java.util.Random;
  38 
  39 import org.testng.annotations.DataProvider;
  40 import org.testng.annotations.Test;
  41 
  42 import static org.testng.Assert.assertEquals;
  43 
  44 public class Chars {
  45 
  46     static final Random RAND = new Random();
  47 
  48     static final int SIZE = 128 + RAND.nextInt(1024);
  49 
  50     /**
  51      * Randomize the char buffer's position and limit.
  52      */
  53     static CharBuffer randomizeRange(CharBuffer cb) {
  54         int mid = cb.capacity() >>> 1;
  55         int start = RAND.nextInt(mid + 1); // from 0 to mid
  56         int end = mid + RAND.nextInt(cb.capacity() - mid + 1); // from mid to capacity
  57         cb.position(start);
  58         cb.limit(end);
  59         return cb;
  60     }
  61 
  62     /**
  63      * Randomize the char buffer's contents, position and limit.
  64      */
  65     static CharBuffer randomize(CharBuffer cb) {
  66         while (cb.hasRemaining()) {
  67             cb.put((char)RAND.nextInt());
  68         }
  69         return randomizeRange(cb);
  70     }
  71 
  72     /**
  73      * Sums the remaining chars in the char buffer.
  74      */
  75     static int intSum(CharBuffer cb) {
  76         int sum = 0;
  77         cb.mark();
  78         while (cb.hasRemaining()) {
  79             sum += cb.get();
  80         }
  81         cb.reset();
  82         return sum;
  83     }
  84 
  85     /**
  86      * Creates char buffers to test, adding them to the given list.
  87      */
  88     static void addCases(CharBuffer cb, List<CharBuffer> buffers) {
  89         randomize(cb);
  90         buffers.add(cb);
  91 
  92         buffers.add(cb.slice());
  93         buffers.add(cb.duplicate());
  94         buffers.add(cb.asReadOnlyBuffer());
  95 
  96         buffers.add(randomizeRange(cb.slice()));
  97         buffers.add(randomizeRange(cb.duplicate()));
  98         buffers.add(randomizeRange(cb.asReadOnlyBuffer()));
  99     }
 100 
 101     @DataProvider(name = "charbuffers")
 102     public Object[][] createCharBuffers() {
 103         List<CharBuffer> buffers = new ArrayList<>();
 104 
 105         // heap
 106         addCases(CharBuffer.allocate(SIZE), buffers);
 107         addCases(CharBuffer.wrap(new char[SIZE]), buffers);
 108         addCases(ByteBuffer.allocate(SIZE*2).order(ByteOrder.BIG_ENDIAN).asCharBuffer(),
 109                  buffers);
 110         addCases(ByteBuffer.allocate(SIZE*2).order(ByteOrder.LITTLE_ENDIAN).asCharBuffer(),
 111                  buffers);
 112 
 113         // direct
 114         addCases(ByteBuffer.allocateDirect(SIZE*2).order(ByteOrder.BIG_ENDIAN).asCharBuffer(),
 115                  buffers);
 116         addCases(ByteBuffer.allocateDirect(SIZE*2).order(ByteOrder.LITTLE_ENDIAN).asCharBuffer(),
 117                  buffers);
 118 
 119         // read-only buffer backed by a CharSequence
 120         buffers.add(CharBuffer.wrap(randomize(CharBuffer.allocate(SIZE))));
 121 
 122         Object[][] params = new Object[buffers.size()][];
 123         for (int i = 0; i < buffers.size(); i++) {
 124             CharBuffer cb = buffers.get(i);
 125             params[i] = new Object[] { cb.getClass().getName(), cb };
 126         }
 127 
 128         return params;
 129     }
 130 
 131     @Test(dataProvider = "charbuffers")
 132     public void testChars(String type, CharBuffer cb) {
 133         System.out.format("%s position=%d, limit=%d%n", type, cb.position(), cb.limit());
 134         int expected = intSum(cb);
 135         assertEquals(cb.chars().sum(), expected);
 136         assertEquals(cb.chars().parallel().sum(), expected);
 137     }
 138 }