73 lines
2.8 KiB
Java
73 lines
2.8 KiB
Java
/*
|
|
* Copyright (c) 2015, 2020, Oracle and/or its affiliates. All rights reserved.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* This code is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 only, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* version 2 for more details (a copy is included in the LICENSE file that
|
|
* accompanied this code).
|
|
*
|
|
* You should have received a copy of the GNU General Public License version
|
|
* 2 along with this work; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
* or visit www.oracle.com if you need additional information or have any
|
|
* questions.
|
|
*/
|
|
|
|
/**
|
|
* @test
|
|
* @bug 8080535 8191410 8215194 8221431 8239383
|
|
* @summary Expected size of Character.UnicodeBlock.map is not optimal
|
|
* @library /test/lib
|
|
* @modules java.base/java.lang:open
|
|
* java.base/java.util:open
|
|
* @build jdk.test.lib.util.OptimalCapacity
|
|
* @run main OptimalMapSize
|
|
*/
|
|
|
|
import java.lang.reflect.Field;
|
|
import jdk.test.lib.util.OptimalCapacity;
|
|
|
|
// What will be the number of the Unicode blocks in the future.
|
|
//
|
|
// According to http://www.unicode.org/versions/Unicode7.0.0/ ,
|
|
// in Unicode 7 there will be added 32 new blocks (96 with aliases).
|
|
// According to http://www.unicode.org/versions/beta-8.0.0.html ,
|
|
// in Unicode 8 there will be added 10 more blocks (30 with aliases).
|
|
//
|
|
// After implementing support of Unicode 9 and 10 in Java, there will
|
|
// be 638 entries in Character.UnicodeBlock.map.
|
|
//
|
|
// As of Unicode 11, 667 entries are expected.
|
|
// As of Unicode 12.1, 676 entries are expected.
|
|
// As of Unicode 13.0, 684 entries are expected.
|
|
//
|
|
// Initialization of the map and this test will have to be adjusted
|
|
// accordingly then.
|
|
//
|
|
// Note that HashMap's implementation aligns the initial capacity to
|
|
// a power of two size, so it will end up 1024 (and thus succeed) in
|
|
// cases, such as 638, 667, 676, and 684.
|
|
|
|
public class OptimalMapSize {
|
|
public static void main(String[] args) throws Throwable {
|
|
// The initial size of Character.UnicodeBlock.map.
|
|
// See src/java.base/share/classes/java/lang/Character.java
|
|
Field f = Character.UnicodeBlock.class.getDeclaredField("NUM_ENTITIES");
|
|
f.setAccessible(true);
|
|
int num_entities = f.getInt(null);
|
|
assert num_entities == 684;
|
|
int initialCapacity = (int)(num_entities / 0.75f + 1.0f);
|
|
|
|
OptimalCapacity.ofHashMap(Character.UnicodeBlock.class,
|
|
"map", initialCapacity);
|
|
}
|
|
}
|