| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
| MappedEnumeration |
|
| 1.5;1.5 |
| 1 | /* | |
| 2 | * $Source$ | |
| 3 | * $Revision$ | |
| 4 | * | |
| 5 | * Copyright (C) 2000 William Chesters | |
| 6 | * | |
| 7 | * Part of Melati (http://melati.org), a framework for the rapid | |
| 8 | * development of clean, maintainable web applications. | |
| 9 | * | |
| 10 | * Melati is free software; Permission is granted to copy, distribute | |
| 11 | * and/or modify this software under the terms either: | |
| 12 | * | |
| 13 | * a) the GNU General Public License as published by the Free Software | |
| 14 | * Foundation; either version 2 of the License, or (at your option) | |
| 15 | * any later version, | |
| 16 | * | |
| 17 | * or | |
| 18 | * | |
| 19 | * b) any version of the Melati Software License, as published | |
| 20 | * at http://melati.org | |
| 21 | * | |
| 22 | * You should have received a copy of the GNU General Public License and | |
| 23 | * the Melati Software License along with this program; | |
| 24 | * if not, write to the Free Software Foundation, Inc., | |
| 25 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the | |
| 26 | * GNU General Public License and visit http://melati.org to obtain the | |
| 27 | * Melati Software License. | |
| 28 | * | |
| 29 | * Feel free to contact the Developers of Melati (http://melati.org), | |
| 30 | * if you would like to work out a different arrangement than the options | |
| 31 | * outlined here. It is our intention to allow Melati to be used by as | |
| 32 | * wide an audience as possible. | |
| 33 | * | |
| 34 | * This program is distributed in the hope that it will be useful, | |
| 35 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 36 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 37 | * GNU General Public License for more details. | |
| 38 | * | |
| 39 | * Contact details for copyright holder: | |
| 40 | * | |
| 41 | * William Chesters <williamc At paneris.org> | |
| 42 | * http://paneris.org/~williamc | |
| 43 | * Obrechtstraat 114, 2517VX Den Haag, The Netherlands | |
| 44 | */ | |
| 45 | ||
| 46 | package org.melati.poem.util; | |
| 47 | ||
| 48 | import java.util.Enumeration; | |
| 49 | ||
| 50 | /** | |
| 51 | * An <code>Enumeration</code> that encapsulates another and | |
| 52 | * translates each element according to an abstract mapping function. | |
| 53 | * <p> | |
| 54 | * Implementations must provide {@link #mapped(Object)}. | |
| 55 | */ | |
| 56 | public abstract class MappedEnumeration<T,I> implements Enumeration<T> { | |
| 57 | ||
| 58 | private Enumeration<I> enumeration; | |
| 59 | ||
| 60 | /** | |
| 61 | * Wrapper Constructor given Enumeration to wrap. | |
| 62 | * @param enumeration Enumeration to wrap | |
| 63 | */ | |
| 64 | 1985 | public MappedEnumeration(Enumeration<I> enumeration) { |
| 65 | 1985 | if (enumeration == null) throw new NullPointerException(); |
| 66 | 1985 | this.enumeration = enumeration; |
| 67 | 1985 | } |
| 68 | ||
| 69 | /** | |
| 70 | * {@inheritDoc} | |
| 71 | * @see java.util.Enumeration#hasMoreElements() | |
| 72 | */ | |
| 73 | public boolean hasMoreElements() { | |
| 74 | 16685 | return enumeration.hasMoreElements(); |
| 75 | } | |
| 76 | ||
| 77 | /** | |
| 78 | * @param element the element of the Enumeration to act on | |
| 79 | * @return the element after transformation | |
| 80 | */ | |
| 81 | protected abstract T mapped(I element); | |
| 82 | ||
| 83 | /** | |
| 84 | * {@inheritDoc} | |
| 85 | * @see java.util.Enumeration#nextElement() | |
| 86 | */ | |
| 87 | public T nextElement() { | |
| 88 | 14465 | return mapped(enumeration.nextElement()); |
| 89 | } | |
| 90 | } |