1 | /** |
---|
2 | * Licensed to the Apache Software Foundation (ASF) under one |
---|
3 | * or more contributor license agreements. See the NOTICE file |
---|
4 | * distributed with this work for additional information |
---|
5 | * regarding copyright ownership. The ASF licenses this file |
---|
6 | * to you under the Apache License, Version 2.0 (the |
---|
7 | * "License"); you may not use this file except in compliance |
---|
8 | * with the License. You may obtain a copy of the License at |
---|
9 | * |
---|
10 | * http://www.apache.org/licenses/LICENSE-2.0 |
---|
11 | * |
---|
12 | * Unless required by applicable law or agreed to in writing, software |
---|
13 | * distributed under the License is distributed on an "AS IS" BASIS, |
---|
14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
---|
15 | * See the License for the specific language governing permissions and |
---|
16 | * limitations under the License. |
---|
17 | */ |
---|
18 | |
---|
19 | package org.apache.hadoop.util; |
---|
20 | |
---|
21 | import java.util.ArrayList; |
---|
22 | import java.util.List; |
---|
23 | |
---|
24 | import junit.framework.TestCase; |
---|
25 | |
---|
26 | import org.apache.hadoop.conf.Configuration; |
---|
27 | |
---|
28 | public class TestGenericsUtil extends TestCase { |
---|
29 | |
---|
30 | public void testToArray() { |
---|
31 | |
---|
32 | //test a list of size 10 |
---|
33 | List<Integer> list = new ArrayList<Integer>(); |
---|
34 | |
---|
35 | for(int i=0; i<10; i++) { |
---|
36 | list.add(i); |
---|
37 | } |
---|
38 | |
---|
39 | Integer[] arr = GenericsUtil.toArray(list); |
---|
40 | |
---|
41 | for (int i = 0; i < arr.length; i++) { |
---|
42 | assertEquals(list.get(i), arr[i]); |
---|
43 | } |
---|
44 | } |
---|
45 | |
---|
46 | public void testWithEmptyList() { |
---|
47 | try { |
---|
48 | List<String> list = new ArrayList<String>(); |
---|
49 | String[] arr = GenericsUtil.toArray(list); |
---|
50 | fail("Empty array should throw exception"); |
---|
51 | System.out.println(arr); //use arr so that compiler will not complain |
---|
52 | |
---|
53 | }catch (IndexOutOfBoundsException ex) { |
---|
54 | //test case is successful |
---|
55 | } |
---|
56 | } |
---|
57 | |
---|
58 | public void testWithEmptyList2() { |
---|
59 | List<String> list = new ArrayList<String>(); |
---|
60 | //this method should not throw IndexOutOfBoundsException |
---|
61 | String[] arr = GenericsUtil.<String>toArray(String.class, list); |
---|
62 | |
---|
63 | assertEquals(0, arr.length); |
---|
64 | } |
---|
65 | |
---|
66 | /** This class uses generics */ |
---|
67 | private class GenericClass<T> { |
---|
68 | T dummy; |
---|
69 | List<T> list = new ArrayList<T>(); |
---|
70 | |
---|
71 | void add(T item) { |
---|
72 | list.add(item); |
---|
73 | } |
---|
74 | |
---|
75 | T[] funcThatUsesToArray() { |
---|
76 | T[] arr = GenericsUtil.toArray(list); |
---|
77 | return arr; |
---|
78 | } |
---|
79 | } |
---|
80 | |
---|
81 | public void testWithGenericClass() { |
---|
82 | |
---|
83 | GenericClass<String> testSubject = new GenericClass<String>(); |
---|
84 | |
---|
85 | testSubject.add("test1"); |
---|
86 | testSubject.add("test2"); |
---|
87 | |
---|
88 | try { |
---|
89 | //this cast would fail, if we had not used GenericsUtil.toArray, since the |
---|
90 | //rmethod would return Object[] rather than String[] |
---|
91 | String[] arr = testSubject.funcThatUsesToArray(); |
---|
92 | |
---|
93 | assertEquals("test1", arr[0]); |
---|
94 | assertEquals("test2", arr[1]); |
---|
95 | |
---|
96 | }catch (ClassCastException ex) { |
---|
97 | fail("GenericsUtil#toArray() is not working for generic classes"); |
---|
98 | } |
---|
99 | |
---|
100 | } |
---|
101 | |
---|
102 | public void testGenericOptionsParser() throws Exception { |
---|
103 | GenericOptionsParser parser = new GenericOptionsParser( |
---|
104 | new Configuration(), new String[] {"-jt"}); |
---|
105 | assertEquals(parser.getRemainingArgs().length, 0); |
---|
106 | |
---|
107 | // test if -D accepts -Dx=y=z |
---|
108 | parser = |
---|
109 | new GenericOptionsParser(new Configuration(), |
---|
110 | new String[] {"-Dx=y=z"}); |
---|
111 | assertEquals(parser.getConfiguration().get("x"), "y=z"); |
---|
112 | } |
---|
113 | |
---|
114 | public void testGetClass() { |
---|
115 | |
---|
116 | //test with Integer |
---|
117 | Integer x = new Integer(42); |
---|
118 | Class<Integer> c = GenericsUtil.getClass(x); |
---|
119 | assertEquals(Integer.class, c); |
---|
120 | |
---|
121 | //test with GenericClass<Integer> |
---|
122 | GenericClass<Integer> testSubject = new GenericClass<Integer>(); |
---|
123 | Class<GenericClass<Integer>> c2 = GenericsUtil.getClass(testSubject); |
---|
124 | assertEquals(GenericClass.class, c2); |
---|
125 | } |
---|
126 | |
---|
127 | } |
---|