1 // Protocol Buffers - Google's data interchange format
2 // Copyright 2008 Google Inc.  All rights reserved.
3 // https://developers.google.com/protocol-buffers/
4 //
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6 // modification, are permitted provided that the following conditions are
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8 //
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10 // notice, this list of conditions and the following disclaimer.
11 //     * Redistributions in binary form must reproduce the above
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18 //
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30 
31 package com.google.protobuf;
32 
33 import junit.framework.TestCase;
34 
35 import java.io.ByteArrayOutputStream;
36 import java.io.IOException;
37 import java.nio.ByteBuffer;
38 import java.util.Arrays;
39 import java.util.Random;
40 
41 /**
42  * Tests for {@link ByteBufferWriter}.
43  */
44 public class ByteBufferWriterTest extends TestCase {
45 
testHeapBuffer()46   public void testHeapBuffer() throws IOException {
47     // Test a small and large buffer.
48     testWrite(ByteBuffer.allocate(100));
49     testWrite(ByteBuffer.allocate(1024 * 100));
50   }
51 
testDirectBuffer()52   public void testDirectBuffer() throws IOException {
53     // Test a small and large buffer.
54     testWrite(ByteBuffer.allocateDirect(100));
55     testWrite(ByteBuffer.allocateDirect(1024 * 100));
56   }
57 
testWrite(ByteBuffer buffer)58   private void testWrite(ByteBuffer buffer) throws IOException {
59     fillRandom(buffer);
60     ByteArrayOutputStream os = new ByteArrayOutputStream(buffer.remaining());
61     ByteBufferWriter.write(buffer, os);
62     assertEquals(0, buffer.position());
63     assertTrue(Arrays.equals(toArray(buffer), os.toByteArray()));
64   }
65 
fillRandom(ByteBuffer buf)66   private void fillRandom(ByteBuffer buf) {
67     byte[] bytes = new byte[buf.remaining()];
68     new Random().nextBytes(bytes);
69     buf.put(bytes);
70     buf.flip();
71     return;
72   }
73 
toArray(ByteBuffer buf)74   private byte[] toArray(ByteBuffer buf) {
75     int originalPosition = buf.position();
76     byte[] bytes = new byte[buf.remaining()];
77     buf.get(bytes);
78     buf.position(originalPosition);
79     return bytes;
80   }
81 }
82