1   /**
2    *  Copyright 2010 The Apache Software Foundation
3    * 
4    *  Licensed under the Apache License, Version 2.0 (the "License");
5    *  you may not use this file except in compliance with the License.
6    *  You may obtain a copy of the License at
7    * 
8    *       http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   *  Unless required by applicable law or agreed to in writing, software
11   *  distributed under the License is distributed on an "AS IS" BASIS,
12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *  See the License for the specific language governing permissions and
14   *  limitations under the License.
15   *  under the License.
16   */
17  package org.apache.hadoop.hbase.filter;
18  
19  import junit.framework.TestCase;
20  import org.apache.hadoop.hbase.SmallTests;
21  import org.junit.experimental.categories.Category;
22  
23  /**
24   * Tests for the bit comparator
25   */
26  @Category(SmallTests.class)
27  public class TestBitComparator extends TestCase {
28  
29    private static byte[] zeros = new byte[]{0, 0, 0, 0, 0, 0};
30    private static byte[] ones = new byte[]{1, 1, 1, 1, 1, 1};
31    private static byte[] data0 = new byte[]{0, 1, 2, 4, 8, 15};
32    private static byte[] data1 = new byte[]{15, 0, 0, 0, 0, 0};
33    private static byte[] data2 = new byte[]{0, 0, 0, 0, 0, 15};
34    private static byte[] data3 = new byte[]{15, 15, 15, 15, 15};
35    
36    // data for testing compareTo method with offset and length parameters
37    private static byte[] data1_2 = new byte[]{15, 15, 0, 0, 0, 0, 0, 15};
38    private static byte[] data2_2 = new byte[]{15, 0, 0, 0, 0, 0, 15, 15};
39    
40    private final int Equal = 0;
41    private final int NotEqual = 1;
42  
43    public void testANDOperation() {
44      testOperation(zeros, ones, BitComparator.BitwiseOp.AND, NotEqual);
45      testOperation(data1, ones, BitComparator.BitwiseOp.AND, Equal);
46      testOperation(data1, data0, BitComparator.BitwiseOp.AND, NotEqual);
47      testOperation(data2, data1, BitComparator.BitwiseOp.AND, NotEqual);
48      testOperation(ones, data0, BitComparator.BitwiseOp.AND, Equal);
49      testOperation(ones, data3, BitComparator.BitwiseOp.AND, NotEqual);
50    }
51  
52    public void testOROperation() {
53      testOperation(ones, zeros, BitComparator.BitwiseOp.OR, Equal);
54      testOperation(zeros, zeros, BitComparator.BitwiseOp.OR, NotEqual);
55      testOperation(data1, zeros, BitComparator.BitwiseOp.OR, Equal);
56      testOperation(data2, data1, BitComparator.BitwiseOp.OR, Equal);
57      testOperation(ones, data3, BitComparator.BitwiseOp.OR, NotEqual);
58    }
59  
60    public void testXOROperation() {
61      testOperation(ones, zeros, BitComparator.BitwiseOp.XOR, Equal);
62      testOperation(zeros, zeros, BitComparator.BitwiseOp.XOR, NotEqual);
63      testOperation(ones, ones, BitComparator.BitwiseOp.XOR, NotEqual);
64      testOperation(data2, data1, BitComparator.BitwiseOp.XOR, Equal);
65      testOperation(ones, data3, BitComparator.BitwiseOp.XOR, NotEqual);
66    }
67  
68    private void testOperation(byte[] data, byte[] comparatorBytes, BitComparator.BitwiseOp operator, int expected) {
69      BitComparator comparator = new BitComparator(comparatorBytes, operator);
70      assertEquals(comparator.compareTo(data), expected);
71    }
72  
73    public void testANDOperationWithOffset() {
74      testOperationWithOffset(data1_2, ones, BitComparator.BitwiseOp.AND, Equal);
75      testOperationWithOffset(data1_2, data0, BitComparator.BitwiseOp.AND, NotEqual);
76      testOperationWithOffset(data2_2, data1, BitComparator.BitwiseOp.AND, NotEqual);
77    }
78  
79    public void testOROperationWithOffset() {
80      testOperationWithOffset(data1_2, zeros, BitComparator.BitwiseOp.OR, Equal);
81      testOperationWithOffset(data2_2, data1, BitComparator.BitwiseOp.OR, Equal);
82    }
83  
84    public void testXOROperationWithOffset() {
85      testOperationWithOffset(data2_2, data1, BitComparator.BitwiseOp.XOR, Equal);
86    }
87  
88    private void testOperationWithOffset(byte[] data, byte[] comparatorBytes, BitComparator.BitwiseOp operator, int expected) {
89      BitComparator comparator = new BitComparator(comparatorBytes, operator);
90      assertEquals(comparator.compareTo(data, 1, comparatorBytes.length), expected);
91    }
92  
93    @org.junit.Rule
94    public org.apache.hadoop.hbase.ResourceCheckerJUnitRule cu =
95      new org.apache.hadoop.hbase.ResourceCheckerJUnitRule();
96  }
97