Initial revision

From-SVN: r102074

libjava/classpath/gnu/CORBA/ByteArrayComparator.java

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+/* ByteArrayComparator.java --
+   Copyright (C) 2005 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.CORBA;
+
+import java.util.Arrays;
+import java.util.Comparator;
+
+/**
+ * A byte array comparator for mapping with CORBA object keys.
+ *
+ * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
+ */
+public class ByteArrayComparator
+  implements Comparator
+{
+  /**
+   * Compare arrays first by absolute equality, then by length
+   * and then (byte to byte) by content.
+   *
+   * @return 0 if arrays are equal, some comparison value otherwise.
+   */
+  public int compare(Object an_a, Object a_b)
+  {
+    if (an_a == a_b)
+      return 0;
+
+    byte[] a = null;
+    byte[] b = null;
+    try
+      {
+        a = (byte[]) an_a;
+        b = (byte[]) a_b;
+      }
+    catch (Exception ex)
+      {
+        throw new InternalError(an_a.getClass().getName() + "," +
+                                a_b.getClass().getName()
+                               );
+      }
+
+    if (a.length != b.length)
+      return a.length - b.length;
+    else
+      {
+        // The array sizes must be equal.
+        for (int i = 0; i < b.length; i++)
+          {
+            if (a [ i ] != b [ i ])
+              return a [ i ] - b [ i ];
+          }
+      }
+
+    return 0;
+  }
+}