| /** |
| * 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 junit.framework.TestCase; |
| |
| /** |
| * This is the unit test for BytesWritable. |
| */ |
| public class TestBytesWritable extends TestCase { |
| |
| 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]); |
| } |
| // 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]); |
| } |
| |
| 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()); |
| } |
| |
| 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); |
| } |
| |
| 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"); |
| } |
| } |
| |