Imported GNU Classpath 0.92

2006-08-14  Mark Wielaard  <mark@klomp.org>

       Imported GNU Classpath 0.92
       * HACKING: Add more importing hints. Update automake version
       requirement.

       * configure.ac (gconf-peer): New enable AC argument.
       Add --disable-gconf-peer and --enable-default-preferences-peer
       to classpath configure when gconf is disabled.
       * scripts/makemake.tcl: Set gnu/java/util/prefs/gconf and
       gnu/java/awt/dnd/peer/gtk to bc. Classify
       gnu/java/security/Configuration.java as generated source file.

       * gnu/java/lang/management/VMGarbageCollectorMXBeanImpl.java,
       gnu/java/lang/management/VMMemoryPoolMXBeanImpl.java,
       gnu/java/lang/management/VMClassLoadingMXBeanImpl.java,
       gnu/java/lang/management/VMRuntimeMXBeanImpl.java,
       gnu/java/lang/management/VMMemoryManagerMXBeanImpl.java,
       gnu/java/lang/management/VMThreadMXBeanImpl.java,
       gnu/java/lang/management/VMMemoryMXBeanImpl.java,
       gnu/java/lang/management/VMCompilationMXBeanImpl.java: New VM stub
       classes.
       * java/lang/management/VMManagementFactory.java: Likewise.
       * java/net/VMURLConnection.java: Likewise.
       * gnu/java/nio/VMChannel.java: Likewise.

       * java/lang/Thread.java (getState): Add stub implementation.
       * java/lang/Class.java (isEnum): Likewise.
       * java/lang/Class.h (isEnum): Likewise.

       * gnu/awt/xlib/XToolkit.java (getClasspathTextLayoutPeer): Removed.

       * javax/naming/spi/NamingManager.java: New override for StackWalker
       functionality.

       * configure, sources.am, Makefile.in, gcj/Makefile.in,
       include/Makefile.in, testsuite/Makefile.in: Regenerated.

From-SVN: r116139

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));
+  }
+}