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