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+/* SimpleList.java -- simple way to make tuples.
+   Copyright (C) 2004, 2006 Free Software Foundation, Inc.
+
+This file is a 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 of the License, 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; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, 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.AbstractList;
+import java.util.Collection;
+import java.util.Iterator;
+
+/**
+ * A simple way to create immutable n-tuples. This class can be created with up
+ * to four elements specified via one of the constructors, or with a collection
+ * of arbitrary size.
+ */
+public final class SimpleList
+    extends AbstractList
+{
+  private final Object[] elements;
+
+  /**
+   * Create a singleton list.
+   *
+   * @param element The first element.
+   */
+  public SimpleList(final Object element)
+  {
+    elements = new Object[1];
+    elements[0] = element;
+  }
+
+  /**
+   * Create an ordered pair (2-tuple).
+   *
+   * @param e1 The first element.
+   * @param e2 The second element.
+   */
+  public SimpleList(final Object e1, final Object e2)
+  {
+    elements = new Object[2];
+    elements[0] = e1;
+    elements[1] = e2;
+  }
+
+  /**
+   * Create a 3-tuple.
+   *
+   * @param e1 The first element.
+   * @param e2 The second element.
+   * @param e3 The third element.
+   */
+  public SimpleList(final Object e1, final Object e2, final Object e3)
+  {
+    elements = new Object[3];
+    elements[0] = e1;
+    elements[1] = e2;
+    elements[2] = e3;
+  }
+
+  /**
+   * Create a 4-tuple.
+   *
+   * @param e1 The first element.
+   * @param e2 The second element.
+   * @param e3 The third element.
+   * @param e4 The fourth element.
+   */
+  public SimpleList(final Object e1, final Object e2, final Object e3,
+                    final Object e4)
+  {
+    elements = new Object[4];
+    elements[0] = e1;
+    elements[1] = e2;
+    elements[2] = e3;
+    elements[3] = e4;
+  }
+
+  /**
+   * Create the empty list.
+   */
+  public SimpleList()
+  {
+    elements = null;
+  }
+
+  /**
+   * Create an n-tuple of arbitrary size. Even if the supplied collection has no
+   * natural order, the created n-tuple will have the order that the elements
+   * are returned by the collection's iterator.
+   *
+   * @param c The collection.
+   */
+  public SimpleList(Collection c)
+  {
+    elements = new Object[c.size()];
+    int i = 0;
+    for (Iterator it = c.iterator(); it.hasNext() && i < elements.length;)
+      elements[i++] = it.next();
+  }
+
+  public int size()
+  {
+    if (elements == null)
+      return 0;
+    return elements.length;
+  }
+
+  public Object get(int index)
+  {
+    if (elements == null)
+      throw new IndexOutOfBoundsException("list is empty");
+    if (index < 0 || index >= elements.length)
+      throw new IndexOutOfBoundsException("index=" + index + ", size=" + size());
+    return elements[index];
+  }
+
+  public String toString()
+  {
+    return SimpleList.class.getName() + "(" + size() + ") " + super.toString();
+  }
+}