/*
* Copyright 2003 by Michael Niedermair.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (the "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library 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 Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.lowagie.text;
/**
*
* A special-version of LIST which use roman-letters.
*
* @see com.lowagie.text.List
* @version 2003-06-22
* @author Michael Niedermair
*/
public class RomanList extends List {
/**
* UpperCase or LowerCase
*/
protected boolean romanlower;
/**
* Initialization
*
* @param symbolIndent indent
*/
public RomanList(int symbolIndent) {
super(true, symbolIndent);
}
/**
* Initialization
* @param romanlower roman-char in lowercase
* @param symbolIndent indent
*/
public RomanList(boolean romanlower, int symbolIndent) {
super(true, symbolIndent);
this.romanlower = romanlower;
}
/**
* set the roman-letters to lowercase otherwise to uppercase
*
* @param romanlower
*/
public void setRomanLower(boolean romanlower) {
this.romanlower = romanlower;
}
/**
* Checks if the list is roman-letter with lowercase
*
* @return true if the roman-letter is lowercase, false otherwise.
*/
public boolean isRomanLower() {
return romanlower;
}
/**
* Adds an Object to the List.
*
* @param o the object to add.
* @return true if adding the object succeeded
*/
public boolean add(Object o) {
if (o instanceof ListItem) {
ListItem item = (ListItem) o;
Chunk chunk;
if (romanlower)
chunk = new Chunk(toRomanLowerCase(first + list.size()), symbol.font());
else
chunk = new Chunk(toRomanUppercase(first + list.size()), symbol.font());
chunk.append(".");
item.setListSymbol(chunk);
item.setIndentationLeft(symbolIndent);
item.setIndentationRight(0);
list.add(item);
} else if (o instanceof List) {
List nested = (List) o;
nested.setIndentationLeft(nested.indentationLeft() + symbolIndent);
first--;
return list.add(nested);
} else if (o instanceof String) {
return this.add(new ListItem((String) o));
}
return false;
}
// ****************************************************************************************
/*
* Wandelt eine Integer-Zahl in römische Schreibweise um
*
* Regeln: http://de.wikipedia.org/wiki/R%F6mische_Ziffern
*
* 1. Die Ziffern werden addiert, wobei sie von groß nach klein sortiert sind:
*
* XVII = 10+5+1+1=17
*
* 2. Eine kleinere Ziffer, die links von einer größeren steht, wird abgezogen:
*
* IV = 5-1=4
* CM = 1000-100=900
*
* 3. Maximal drei gleiche Ziffern stehen nebeneinander (Ausnahme: IIII auf Zifferblaettern von Uhren):
*
* XL = 40 (und nicht XXXX)
* IX = 9 (und nicht VIIII)
* Diese "Subtraktionsschreibweise" ist erst im Mittelalter allgemein gebräuchlich geworden.
* Vorher wurde oft "IIII" für "4" geshrieben.
*
* 4. Bei mehreren möglichen Schreibweisen wird in der Regel der kürzesten der Vorzug gegeben:
*
* IC = 99 (auch LXLIX)
* IL = 49 (auch XLIX oder sogar XLVIV)
* Andererseits gibt es die Vorschrift, nach der ein Symbol, das einen Wert von 10n darstellt,
* nicht einem Symbol, das einen Wert von 10(n+1) darstellt, direkt voranstehen darf.
* Nach dieser Regel wäre die Schreibweise "XCIX" für "99" der Schreibweise "IC" vorzuziehen.
*
* 5. Die römischen Zahlen V, L und D können nicht größeren Zahlen voran gestellt werden:
*
* XCV = 95 (nicht VC)
*
* Zahlen über 3000 werden dargestellt durch Einkastung der Tausender: |IX|LIV=9054
*
*
* Zahlen größer als 3.000.000 werden durch Doppelstrich etc. dargestellt.
*/
/**
* Array with Roman digits.
*/
private static final RomanDigit[] roman =
{
new RomanDigit('m', 1000, false),
new RomanDigit('d', 500, false),
new RomanDigit('c', 100, true),
new RomanDigit('l', 50, false),
new RomanDigit('x', 10, true),
new RomanDigit('v', 5, false),
new RomanDigit('i', 1, true)};
/**
* changes an int into a lower case roman number.
* @param number the original number
* @return the roman number (lower case)
*/
public static String toRoman(int number) {
return toRomanLowerCase(number);
}
/**
* Changes an int into an upper case roman number.
* @param number the original number
* @return the roman number (upper case)
*/
public static String toRomanUppercase(int number) {
return toRomanLowerCase(number).toUpperCase();
}
/**
* Changes an int into a lower case roman number.
* @param number the original number
* @return the roman number (lower case)
*/
public static String toRomanLowerCase(int number) {
// Buffer
StringBuffer buf = new StringBuffer();
// kleiner 0 ? Vorzeichen festlegen
if (number < 0) {
buf.append('-');
number = -number;
}
// größer 3000
if (number > 3000) {
// rekursiver Aufruf (ohne tausender-Bereich)
buf.append('|');
buf.append(toRomanLowerCase(number / 1000));
buf.append('|');
// tausender-Bereich
number = number - (number / 1000) * 1000;
}
// Schleife
int pos = 0;
while (true) {
// roman-array durchlaufen
RomanDigit dig = roman[pos];
// solange Zahl größer roman-Wert
while (number >= dig.value) {
// Zeichen hinzufügen
buf.append(dig.digit);
// Wert des Zeichens abziehen
number -= dig.value;
}
// Abbruch
if (number <= 0) {
break;
}
// pre=false suchen (ab Stelle pos)
int j = pos;
while (!roman[++j].pre);
// neuer Wert größer
if (number + roman[j].value >= dig.value) {
// hinzufügen
buf.append(roman[j].digit).append(dig.digit);
// Wert vom Rest abziehen
number -= dig.value - roman[j].value;
}
pos++;
}
return buf.toString();
}
/**
* Helper class for Roman Digits
*/
private static class RomanDigit {
/** part of a roman number */
public char digit;
/** value of the roman digit */
public int value;
/** can the digit be used as a prefix */
public boolean pre;
/**
* Constructs a roman digit
* @param digit the roman digit
* @param value the value
* @param pre can it be used as a prefix
*/
RomanDigit(char digit, int value, boolean pre) {
this.digit = digit;
this.value = value;
this.pre = pre;
}
}
}