hello all,
the attached patch --already committed-- adds Integer related utility methods
to:
a. cache Integer.valueOf(String) results in a LRU of 100 places organised by
access order,
b. simulate the version 5 Integer.valueOf(int) method, so client code can run
on a version 1.4 of the Java class library.
a new Mauve test TestOfIntegerUtil (in gnu.testlet.gnu.java.security.util) has
been added.
2006-07-22 Raif S. Naffah <[EMAIL PROTECTED]>
* gnu/java/security/util/IntegerUtil.java: New file.
cheers;
rsn
Index: IntegerUtil.java
===================================================================
RCS file: IntegerUtil.java
diff -N IntegerUtil.java
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ IntegerUtil.java 1 Jan 1970 00:00:00 -0000
@@ -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 [EMAIL PROTECTED] 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 [EMAIL PROTECTED] 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 [EMAIL PROTECTED] 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 [EMAIL PROTECTED] Integer} object representing the designated primitive.
+ */
+ public static final Integer valueOf(int anInt)
+ {
+ return valueOf(Integer.toString(anInt, 10));
+ }
+}
