99 lines
3.0 KiB
Java
99 lines
3.0 KiB
Java
/**
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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/PoorMansEnum.java,v $
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* $Date: 2002/10/05 01:28:57 $
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* $Revision: 1.1 $
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*
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*******************************************************************************
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*/
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/* Goal for enum is:
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* Easy to use
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* ID <-> int
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* ID <-> string name
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*/
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package com.ibm.text.utility;
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import java.util.*;
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public class PoorMansEnum {
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protected int value;
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protected String name;
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protected PoorMansEnum next;
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public int toInt() {
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return value;
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}
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public String toString() {
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return name;
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}
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// for subclassers
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protected PoorMansEnum() {
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}
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/** Utility for subclasses
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*/
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protected static class EnumStore {
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private List int2Id = new ArrayList();
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private Map string2Id = new HashMap();
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private PoorMansEnum last = null;
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public PoorMansEnum add(PoorMansEnum id, String name) {
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// both string and id must be new!
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if (int2Id.indexOf(id) >= 0) {
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throw new IllegalArgumentException("ID already stored for \"" + name + '"');
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} else if (string2Id.containsKey(name)) {
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throw new IllegalArgumentException('"' + name + "\" already stored for ID ");
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}
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id.value = int2Id.size();
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id.name = name;
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if (last != null) {
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last.next = id;
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}
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int2Id.add(id);
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string2Id.put(name, id);
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last = id;
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return id;
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}
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public PoorMansEnum addAlias(PoorMansEnum id, String name) {
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// id must be old, string must be new
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if (int2Id.indexOf(id) < 0) {
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throw new IllegalArgumentException("ID must already be stored for \"" + name + '"');
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} else if (string2Id.containsKey(name)) {
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throw new IllegalArgumentException('"' + name + "\" already stored for ID ");
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}
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string2Id.put(name, id);
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return id;
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}
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public Collection getAliases(PoorMansEnum id, Collection output) {
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Iterator it = string2Id.keySet().iterator();
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while (it.hasNext()) {
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Object s = it.next();
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if (s == id.name) continue;
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if (id == string2Id.get(s)) output.add(s);
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}
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return output;
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}
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public int getMax() {
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return int2Id.size();
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}
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public PoorMansEnum get(int value) {
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return (PoorMansEnum) int2Id.get(value);
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}
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public PoorMansEnum get(String name) {
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return (PoorMansEnum) string2Id.get(name);
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}
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}
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} |