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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/security/util/IntegerUtil.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/security/util/IntegerUtil.java')
-rw-r--r-- | libjava/classpath/gnu/java/security/util/IntegerUtil.java | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/security/util/IntegerUtil.java b/libjava/classpath/gnu/java/security/util/IntegerUtil.java new file mode 100644 index 000000000..106dc4d66 --- /dev/null +++ b/libjava/classpath/gnu/java/security/util/IntegerUtil.java @@ -0,0 +1,109 @@ +/* IntegerUtil.java -- JDK 5 Integer methods with 1.4 API + Copyright (C) 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.security.util; + +import java.util.LinkedHashMap; +import java.util.Map; + +/** + * Utility class which offers Integer related methods found in RI's version 5 + * but written with RI's 1.4 API. + */ +public abstract class IntegerUtil +{ + /** Maximum size of our cache of constructed Integers. */ + private static final int CACHE_SIZE = 100; + /** LRU (Least Recently Used) cache, of the last accessed 100 Integers. */ + private static final Map cache = new LinkedHashMap(CACHE_SIZE + 1, 0.75F, true) + { + public boolean removeEldestEntry(Map.Entry entry) + { + return size() > CACHE_SIZE; + } + }; + + /** Trivial private constructor to enforce Singleton usage. */ + private IntegerUtil() + { + super(); + } + + /** + * Similar to {@link Integer#valueOf(String)} except it caches the result in + * a local LRU cache of 100 elements, organized by access order. + * <p> + * This method MUST be used in the gnu.java.security and gnu.javax.crypto + * packages to ensure they would work with a version 1.4 only of the Java + * class library API. + * + * @param aString a string representation of an integer. + * @return the {@link Integer} object representing the designated string. + */ + public static final Integer valueOf(String aString) + { + Integer result; + synchronized (cache) + { + result = (Integer) cache.get(aString); + if (result == null) + { + result = Integer.valueOf(aString); + cache.put(aString, result); + } + } + return result; + } + + /** + * Simulates the <code>valueOf(int)</code> method found in {@link Integer} of + * the RI's version 1.5 using a local LRU cache of 100 elements, organized by + * access order. + * <p> + * This method MUST be used in the gnu.java.security and gnu.javax.crypto + * packages to ensure they would work with a version 1.4 only of the Java + * class library API. + * + * @param anInt a decimal integer. + * @return the {@link Integer} object representing the designated primitive. + */ + public static final Integer valueOf(int anInt) + { + return valueOf(Integer.toString(anInt, 10)); + } +} |