| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.io; |
| |
| import org.junit.Test; |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| |
| |
| /** |
| * This is the unit test for BytesWritable. |
| */ |
| public class TestBytesWritable { |
| |
| @Test |
| public void testSizeChange() throws Exception { |
| byte[] hadoop = "hadoop".getBytes(); |
| BytesWritable buf = new BytesWritable(hadoop); |
| int size = buf.getLength(); |
| int orig_capacity = buf.getCapacity(); |
| buf.setSize(size*2); |
| int new_capacity = buf.getCapacity(); |
| System.arraycopy(buf.getBytes(), 0, buf.getBytes(), size, size); |
| assertTrue(new_capacity >= size * 2); |
| assertEquals(size * 2, buf.getLength()); |
| assertTrue(new_capacity != orig_capacity); |
| buf.setSize(size*4); |
| assertTrue(new_capacity != buf.getCapacity()); |
| for(int i=0; i < size*2; ++i) { |
| assertEquals(hadoop[i%size], buf.getBytes()[i]); |
| } |
| // ensure that copyBytes is exactly the right length |
| assertEquals(size*4, buf.copyBytes().length); |
| // shrink the buffer |
| buf.setCapacity(1); |
| // make sure the size has been cut down too |
| assertEquals(1, buf.getLength()); |
| // but that the data is still there |
| assertEquals(hadoop[0], buf.getBytes()[0]); |
| } |
| |
| @Test |
| public void testHash() throws Exception { |
| byte[] owen = "owen".getBytes(); |
| BytesWritable buf = new BytesWritable(owen); |
| assertEquals(4347922, buf.hashCode()); |
| buf.setCapacity(10000); |
| assertEquals(4347922, buf.hashCode()); |
| buf.setSize(0); |
| assertEquals(1, buf.hashCode()); |
| } |
| |
| @Test |
| public void testCompare() throws Exception { |
| byte[][] values = new byte[][]{"abc".getBytes(), |
| "ad".getBytes(), |
| "abcd".getBytes(), |
| "".getBytes(), |
| "b".getBytes()}; |
| BytesWritable[] buf = new BytesWritable[values.length]; |
| for(int i=0; i < values.length; ++i) { |
| buf[i] = new BytesWritable(values[i]); |
| } |
| // check to make sure the compare function is symetric and reflexive |
| for(int i=0; i < values.length; ++i) { |
| for(int j=0; j < values.length; ++j) { |
| assertTrue(buf[i].compareTo(buf[j]) == -buf[j].compareTo(buf[i])); |
| assertTrue((i == j) == (buf[i].compareTo(buf[j]) == 0)); |
| } |
| } |
| assertTrue(buf[0].compareTo(buf[1]) < 0); |
| assertTrue(buf[1].compareTo(buf[2]) > 0); |
| assertTrue(buf[2].compareTo(buf[3]) > 0); |
| assertTrue(buf[3].compareTo(buf[4]) < 0); |
| } |
| |
| private void checkToString(byte[] input, String expected) { |
| String actual = new BytesWritable(input).toString(); |
| assertEquals(expected, actual); |
| } |
| |
| @Test |
| public void testToString() { |
| checkToString(new byte[]{0,1,2,0x10}, "00 01 02 10"); |
| checkToString(new byte[]{-0x80, -0x7f, -0x1, -0x2, 1, 0}, |
| "80 81 ff fe 01 00"); |
| } |
| /** |
| * This test was written as result of adding the new zero |
| * copy constructor and set method to BytesWritable. These |
| * methods allow users to specify the backing buffer of the |
| * BytesWritable instance and a length. |
| */ |
| @Test |
| public void testZeroCopy() { |
| byte[] bytes = "brock".getBytes(); |
| BytesWritable zeroBuf = new BytesWritable(bytes, bytes.length); // new |
| BytesWritable copyBuf = new BytesWritable(bytes); // old |
| // using zero copy constructor shouldn't result in a copy |
| assertTrue("copy took place, backing array != array passed to constructor", |
| bytes == zeroBuf.getBytes()); |
| assertTrue("length of BW should backing byte array", zeroBuf.getLength() == bytes.length); |
| assertEquals("objects with same backing array should be equal", zeroBuf, copyBuf); |
| assertEquals("string repr of objects with same backing array should be equal", |
| zeroBuf.toString(), copyBuf.toString()); |
| assertTrue("compare order objects with same backing array should be equal", |
| zeroBuf.compareTo(copyBuf) == 0); |
| assertTrue("hash of objects with same backing array should be equal", |
| zeroBuf.hashCode() == copyBuf.hashCode()); |
| |
| // ensure expanding buffer is handled correctly |
| // for buffers created with zero copy api |
| byte[] buffer = new byte[bytes.length * 5]; |
| zeroBuf.set(buffer, 0, buffer.length); // expand internal buffer |
| zeroBuf.set(bytes, 0, bytes.length); // set back to normal contents |
| assertEquals("buffer created with (array, len) has bad contents", |
| zeroBuf, copyBuf); |
| assertTrue("buffer created with (array, len) has bad length", |
| zeroBuf.getLength() == copyBuf.getLength()); |
| } |
| |
| /** |
| * test {@link ByteWritable} |
| * methods compareTo(), toString(), equals() |
| */ |
| @Test |
| public void testObjectCommonMethods() { |
| byte b = 0x9; |
| ByteWritable bw = new ByteWritable(); |
| bw.set(b); |
| assertTrue("testSetByteWritable error", bw.get() == b); |
| assertTrue("testSetByteWritable error < 0", bw.compareTo(new ByteWritable((byte)0xA)) < 0); |
| assertTrue("testSetByteWritable error > 0", bw.compareTo(new ByteWritable((byte)0x8)) > 0); |
| assertTrue("testSetByteWritable error == 0", bw.compareTo(new ByteWritable((byte)0x9)) == 0); |
| assertTrue("testSetByteWritable equals error !!!", bw.equals(new ByteWritable((byte)0x9))); |
| assertTrue("testSetByteWritable equals error !!!", ! bw.equals(new ByteWritable((byte)0xA))); |
| assertTrue("testSetByteWritable equals error !!!", ! bw.equals(new IntWritable(1))); |
| assertEquals("testSetByteWritable error ", "9", bw.toString()); |
| } |
| |
| } |