| /* AttributeValue.java -- parent of type-safe enums of attributes |
| Copyright (C) 2002, 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., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 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.awt; |
| |
| /** |
| * This class is undocumented by Sun, but it is the parent of several other |
| * classes, all of which are type-safe enumerations. This takes care of |
| * <code>equals</code>, <code>toString</code>, and <code>hashCode</code>, so |
| * that you don't have to (although hashCode is commonly overridden). |
| * |
| * @author Eric Blake (ebb9@email.byu.edu) |
| */ |
| class AttributeValue |
| { |
| /** The value of the enumeration. Package visible for speed. */ |
| final int value; |
| |
| /** The list of enumeration names for the given subclass. */ |
| private final String[] names; |
| |
| /** |
| * Construct a type-safe enumeration element. For example,<br> |
| * <pre> |
| * class Foo extends AttributeValue |
| * { |
| * private static final String[] names = { "one", "two" } |
| * public static final Foo ONE = new Foo(0); |
| * public static final Foo TWO = new Foo(1); |
| * private Foo(int value) { super(value, names); } |
| * } |
| * </pre> |
| * |
| * @param value the position of this enumeration element, consecutive from 0 |
| * @param names the constant list of enumeration names for the subclass |
| */ |
| AttributeValue(int value, String[] names) |
| { |
| this.value = value; |
| this.names = names; |
| } |
| |
| /** |
| * Returns the hashcode of this element. This is the index of the element |
| * in the enumeration. Note that equals defaults to the == relation. |
| * |
| * @return the hashcode |
| */ |
| public int hashCode() |
| { |
| return value; |
| } |
| |
| /** |
| * Returns the name of this enumeration element. |
| * |
| * @return the element name |
| */ |
| public String toString() |
| { |
| return names[value]; |
| } |
| } // class AttributeValue |