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99 lines
3.3 KiB
Java
99 lines
3.3 KiB
Java
/* AttributeValue.java -- parent of type-safe enums of attributes
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Copyright (C) 2002 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt;
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/**
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* This class is undocumented by Sun, but it is the parent of several other
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* classes, all of which are type-safe enumerations. This takes care of
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* <code>equals</code>, <code>toString</code>, and <code>hashCode</code>, so
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* that you don't have to (although hashCode is commonly overridden).
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*
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* @author Eric Blake <ebb9@email.byu.edu>
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*/
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class AttributeValue
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{
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/** The value of the enumeration. Package visible for speed. */
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final int value;
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/** The list of enumeration names for the given subclass. */
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private final String[] names;
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/**
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* Construct a type-safe enumeration element. For example,<br>
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* <pre>
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* class Foo extends AttributeValue
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* {
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* private static final String[] names = { "one", "two" }
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* public static final Foo ONE = new Foo(0);
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* public static final Foo TWO = new Foo(1);
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* private Foo(int value) { super(value, names); }
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* }
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* </pre>
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*
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* @param value the position of this enumeration element, consecutive from 0
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* @param names the constant list of enumeration names for the subclass
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*/
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AttributeValue(int value, String[] names)
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{
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this.value = value;
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this.names = names;
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}
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/**
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* Returns the hashcode of this element. This is the index of the element
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* in the enumeration. Note that equals defaults to the == relation.
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*
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* @return the hashcode
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*/
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public int hashCode()
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{
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return value;
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}
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/**
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* Returns the name of this enumeration element.
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*
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* @return the element name
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*/
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public String toString()
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{
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return names[value];
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}
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} // class AttributeValue
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