34 |
|
return map; |
35 |
|
} |
36 |
|
|
37 |
+ |
// classes for testing Comparable fallbacks |
38 |
+ |
static class BI implements Comparable<BI> { |
39 |
+ |
private final int value; |
40 |
+ |
BI(int value) { this.value = value; } |
41 |
+ |
public int compareTo(BI other) { |
42 |
+ |
return Integer.compare(value, other.value); |
43 |
+ |
} |
44 |
+ |
public boolean equals(Object x) { |
45 |
+ |
return (x instanceof BI) && ((BI)x).value == value; |
46 |
+ |
} |
47 |
+ |
public int hashCode() { return 42; } |
48 |
+ |
} |
49 |
+ |
static class CI extends BI { CI(int value) { super(value); } } |
50 |
+ |
static class DI extends BI { DI(int value) { super(value); } } |
51 |
+ |
|
52 |
+ |
static class BS implements Comparable<BS> { |
53 |
+ |
private final String value; |
54 |
+ |
BS(String value) { this.value = value; } |
55 |
+ |
public int compareTo(BS other) { |
56 |
+ |
return value.compareTo(other.value); |
57 |
+ |
} |
58 |
+ |
public boolean equals(Object x) { |
59 |
+ |
return (x instanceof BS) && value.equals(((BS)x).value); |
60 |
+ |
} |
61 |
+ |
public int hashCode() { return 42; } |
62 |
+ |
} |
63 |
+ |
|
64 |
+ |
static class LexicographicList<E extends Comparable<E>> extends ArrayList<E> |
65 |
+ |
implements Comparable<LexicographicList<E>> { |
66 |
+ |
LexicographicList(Collection<E> c) { super(c); } |
67 |
+ |
LexicographicList(E e) { super(Collections.singleton(e)); } |
68 |
+ |
public int compareTo(LexicographicList<E> other) { |
69 |
+ |
int common = Math.min(size(), other.size()); |
70 |
+ |
int r = 0; |
71 |
+ |
for (int i = 0; i < common; i++) { |
72 |
+ |
if ((r = get(i).compareTo(other.get(i))) != 0) |
73 |
+ |
break; |
74 |
+ |
} |
75 |
+ |
if (r == 0) |
76 |
+ |
r = Integer.compare(size(), other.size()); |
77 |
+ |
return r; |
78 |
+ |
} |
79 |
+ |
private static final long serialVersionUID = 0; |
80 |
+ |
} |
81 |
+ |
|
82 |
+ |
/** |
83 |
+ |
* Inserted elements that are subclasses of the same Comparable |
84 |
+ |
* class are found. |
85 |
+ |
*/ |
86 |
+ |
public void testComparableFamily() { |
87 |
+ |
ConcurrentHashMap<BI, Boolean> m = new ConcurrentHashMap<>(); |
88 |
+ |
for (int i = 0; i < 1000; i++) { |
89 |
+ |
assertTrue(m.put(new CI(i), true) == null); |
90 |
+ |
} |
91 |
+ |
for (int i = 0; i < 1000; i++) { |
92 |
+ |
assertTrue(m.containsKey(new CI(i))); |
93 |
+ |
assertTrue(m.containsKey(new DI(i))); |
94 |
+ |
} |
95 |
+ |
} |
96 |
+ |
|
97 |
+ |
/** |
98 |
+ |
* Elements of classes with erased generic type parameters based |
99 |
+ |
* on Comparable can be inserted and found. |
100 |
+ |
*/ |
101 |
+ |
public void testGenericComparable() { |
102 |
+ |
ConcurrentHashMap<Object, Boolean> m = new ConcurrentHashMap<>(); |
103 |
+ |
for (int i = 0; i < 1000; i++) { |
104 |
+ |
BI bi = new BI(i); |
105 |
+ |
BS bs = new BS(String.valueOf(i)); |
106 |
+ |
LexicographicList<BI> bis = new LexicographicList<BI>(bi); |
107 |
+ |
LexicographicList<BS> bss = new LexicographicList<BS>(bs); |
108 |
+ |
assertTrue(m.putIfAbsent(bis, true) == null); |
109 |
+ |
assertTrue(m.containsKey(bis)); |
110 |
+ |
if (m.putIfAbsent(bss, true) == null) |
111 |
+ |
assertTrue(m.containsKey(bss)); |
112 |
+ |
assertTrue(m.containsKey(bis)); |
113 |
+ |
} |
114 |
+ |
for (int i = 0; i < 1000; i++) { |
115 |
+ |
assertTrue(m.containsKey(new ArrayList(Collections.singleton(new BI(i))))); |
116 |
+ |
} |
117 |
+ |
} |
118 |
+ |
|
119 |
+ |
/** |
120 |
+ |
* Elements of non-comparable classes equal to those of classes |
121 |
+ |
* with erased generic type parameters based on Comparable can be |
122 |
+ |
* inserted and found. |
123 |
+ |
*/ |
124 |
+ |
public void testGenericComparable2() { |
125 |
+ |
ConcurrentHashMap<Object, Boolean> m = new ConcurrentHashMap<>(); |
126 |
+ |
for (int i = 0; i < 1000; i++) { |
127 |
+ |
m.put(new ArrayList(Collections.singleton(new BI(i))), true); |
128 |
+ |
} |
129 |
+ |
|
130 |
+ |
for (int i = 0; i < 1000; i++) { |
131 |
+ |
LexicographicList<BI> bis = new LexicographicList<BI>(new BI(i)); |
132 |
+ |
assertTrue(m.containsKey(bis)); |
133 |
+ |
} |
134 |
+ |
} |
135 |
+ |
|
136 |
|
/** |
137 |
|
* clear removes all pairs |
138 |
|
*/ |