94 lines
2.6 KiB
Java
94 lines
2.6 KiB
Java
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/**
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*******************************************************************************
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* Copyright (C) 1996-2001, International Business Machines Corporation and *
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* others. All Rights Reserved. *
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*******************************************************************************
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*
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* $Source: /xsrl/Nsvn/icu/unicodetools/com/ibm/text/utility/EnumBase.java,v $
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* $Date: 2002/06/22 21:01:25 $
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* $Revision: 1.1 $
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*
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*******************************************************************************
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*/
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package com.ibm.text.utility;
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import java.util.*;
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import java.text.*;
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import java.io.*;
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/**
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Used for generating fake enums. These can be compared with ==,
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used in for statements, etc.
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Subclasses will be of the form:
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<pre>
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static public class MyEnum extends EnumBase {
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public static MyEnum
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ZEROED = (MyEnum) makeNext(new MyEnum(), "ZEROED"),
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SHIFTED = (MyEnum) makeNext(new MyEnum(), "SHIFTED"),
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NON_IGNORABLE = (MyEnum) makeNext(new MyEnum(), "NON_IGNORABLE");
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public MyEnum next() { return (MyEnum) internalNext(); }
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}
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</pre>
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*/
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public class EnumBase implements Comparable {
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/** For use in collections
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*/
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public int compareTo(Object other) {
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EnumBase that = (EnumBase) other;
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return value < that.value ? -1 : value > that.value ? 1 : 0;
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}
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// dont' need equals, since object identity sufficies.
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public int hashCode() {
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return value;
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}
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public String toString() {
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return (String)uniqueNames.get(value);
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}
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//////////////////
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private int value;
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private static List uniqueList = new ArrayList();
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private static List uniqueNames = new ArrayList();
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/** For use in for(..) statements
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*/
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public Object internalNext() {
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int temp = value + 1;
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if (temp >= uniqueList.size()) return null;
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Object result = uniqueList.get(temp);
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if (getClass() != result.getClass()) return null;
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return result;
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}
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/**
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* For constructing the enums the first time
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*/
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static protected EnumBase makeNext(EnumBase result, String name) {
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try {
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result.value = uniqueList.size();
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uniqueList.add(result);
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uniqueNames.add(name);
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return result;
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} catch (Exception e) {
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e.printStackTrace();
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throw new IllegalArgumentException("Internal Error in " + result);
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}
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}
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/*
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protected final int getValue() {
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return value;
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}
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*/
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protected EnumBase() {}
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}
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