4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24
25 /**
26 * @test
27 * @bug 8080535
28 * @summary Expected size of Character.UnicodeBlock.map is not optimal
29 */
30
31 import java.lang.reflect.Field;
32 import java.util.HashMap;
33 import java.util.Map;
34
35 public class NonOptimalMapSize {
36 public static void main(String[] args) throws Throwable {
37 Class<?> ubCls = Character.UnicodeBlock.class;
38 Field mapField = ubCls.getDeclaredField("map");
39 mapField.setAccessible(true);
40 Map<?,?> map = (Map<?,?>)mapField.get(null);
41 if (!map.getClass().equals(HashMap.class)) {
42 throw new RuntimeException(
43 "Character.UnicodeBlock.map is expected to be HashMap");
44 }
45 int mapSize = map.size();
46
47 Field sizeField = ubCls.getDeclaredField("INITIAL_CAPACITY");
48 sizeField.setAccessible(true);
49 int INITIAL_CAPACITY = sizeField.getInt(null);
50
51 // Construct a HashMap with specified initial capacity
52 HashMap<Object,Object> map1 = new HashMap<>(INITIAL_CAPACITY);
53 Class<?> hmCls = HashMap.class;
54 Field tableField = hmCls.getDeclaredField("table");
55 tableField.setAccessible(true);
56 // ... and fill it up
57 map1.put(new Object(), new Object());
58 final Object initialTable = tableField.get(map1);
59 while (map1.size() < map.size() &&
60 initialTable == tableField.get(map1)) {
61 map1.put(new Object(), new Object());
62 }
63
64 // Now check that internal storage didn't change
65 if (initialTable != tableField.get(map1)) {
66 throw new RuntimeException(
67 "Initial capacity " + INITIAL_CAPACITY +
68 " was only enough to hold " + (map1.size()-1) +
69 " entries, but needed " + map.size());
70 }
71 }
72 }
|
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /**
25 * @test
26 * @bug 8080535
27 * @summary Expected size of Character.UnicodeBlock.map is not optimal
28 * @library /lib/testlibrary
29 * @build jdk.testlibrary.OptimalCapacity
30 * @run main OptimalMapSize
31 */
32
33 import jdk.testlibrary.OptimalCapacity;
34
35 // What will be the number of the Unicode blocks in the future.
36 //
37 // According to http://www.unicode.org/versions/Unicode7.0.0/ ,
38 // in Unicode 7 there will be added 32 new blocks (96 with aliases).
39 // According to http://www.unicode.org/versions/beta-8.0.0.html ,
40 // in Unicode 8 there will be added 10 more blocks (30 with aliases).
41 //
42 // After implementing support of Unicode 7 and 8 in Java, there will
43 // be 510+96+30 = 636 entries in Character.UnicodeBlock.map.
44 //
45 // Initialization of the map and this test will have to be adjusted
46 // accordingly then.
47
48 public class OptimalMapSize {
49 public static void main(String[] args) throws Throwable {
50 // The initial size of Character.UnicodeBlock.map.
51 // See src/java.base/share/classes/java/lang/Character.java
52 int initialCapacity = (int)(510 / 0.75f + 1.0f);
53
54 OptimalCapacity.ofHashMap(Character.UnicodeBlock.class,
55 "map", initialCapacity);
56 }
57 }
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