| /* 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(); |
| } |
| } |