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