Initial revision

From-SVN: r102074

libjava/classpath/java/util/RandomAccess.java

@@ -0,0 +1,64 @@
+/* RandomAccess.java -- A tagging interface that lists can use to tailor
+   operations to the correct algorithm
+   Copyright (C) 2001, 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 java.util;
+
+/**
+ * Marker interface used to inform <code>List</code> implementations that
+ * they support fast (usually constant time) random access. This allows
+ * generic list algorithms to tailor their behavior based on the list
+ * type.
+ * <p>
+ *
+ * For example, some sorts are n*log(n) on an array, but decay to quadratic
+ * time on a linked list.  As a rule of thumb, this interface should be
+ * used is this loop:<br>
+ * <code>for (int i = 0, n = list.size(); i &lt; n; i++) list.get(i);</code>
+ * <br>runs faster than this loop:<br>
+ * <code>for (Iterator i = list.iterator(); i.hasNext(); ) i.next();</code>
+ *
+ * @author Eric Blake (ebb9@email.byu.edu)
+ * @see List
+ * @since 1.4
+ * @status updated to 1.4
+ */
+public interface RandomAccess
+{
+  // Tagging interface only.
+}