139 lines
4.4 KiB
Java
139 lines
4.4 KiB
Java
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* ====================================================================
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*/
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package org.apache.poi.hwpf.converter;
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import org.apache.poi.util.Beta;
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/**
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* Utility class to translate numbers in letters, usually for lists.
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*
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* @author Sergey Vladimirov (vlsergey {at} gmail {dot} com)
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*/
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@Beta
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public final class NumberFormatter
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{
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private static final String[] ENGLISH_LETTERS = new String[] { "a", "b",
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"c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o",
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"p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" };
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private static final String[] ROMAN_LETTERS = { "m", "cm", "d", "cd", "c",
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"xc", "l", "xl", "x", "ix", "v", "iv", "i" };
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private static final int[] ROMAN_VALUES = { 1000, 900, 500, 400, 100, 90,
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50, 40, 10, 9, 5, 4, 1 };
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private static final int T_ARABIC = 0;
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private static final int T_LOWER_LETTER = 4;
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private static final int T_LOWER_ROMAN = 2;
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private static final int T_ORDINAL = 5;
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private static final int T_UPPER_LETTER = 3;
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private static final int T_UPPER_ROMAN = 1;
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public static String getNumber( int num, int style )
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{
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switch ( style )
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{
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case T_UPPER_ROMAN:
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return toRoman( num ).toUpperCase();
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case T_LOWER_ROMAN:
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return toRoman( num );
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case T_UPPER_LETTER:
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return toLetters( num ).toUpperCase();
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case T_LOWER_LETTER:
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return toLetters( num );
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case T_ARABIC:
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case T_ORDINAL:
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default:
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return String.valueOf( num );
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}
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}
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private static String toLetters( int number )
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{
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final int base = 26;
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if ( number <= 0 )
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throw new IllegalArgumentException( "Unsupported number: " + number );
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if ( number < base + 1 )
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return ENGLISH_LETTERS[number - 1];
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long toProcess = number;
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StringBuilder stringBuilder = new StringBuilder();
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int maxPower = 0;
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{
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int boundary = 0;
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while ( toProcess > boundary )
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{
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maxPower++;
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boundary = boundary * base + base;
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if ( boundary > Integer.MAX_VALUE )
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throw new IllegalArgumentException( "Unsupported number: "
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+ toProcess );
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}
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}
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maxPower--;
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for ( int p = maxPower; p > 0; p-- )
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{
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long boundary = 0;
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long shift = 1;
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for ( int i = 0; i < p; i++ )
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{
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shift *= base;
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boundary = boundary * base + base;
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}
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int count = 0;
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while ( toProcess > boundary )
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{
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count++;
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toProcess -= shift;
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}
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stringBuilder.append( ENGLISH_LETTERS[count - 1] );
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}
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stringBuilder.append( ENGLISH_LETTERS[(int) toProcess - 1] );
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return stringBuilder.toString();
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}
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private static String toRoman( int number )
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{
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if ( number <= 0 )
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throw new IllegalArgumentException( "Unsupported number: " + number );
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StringBuilder result = new StringBuilder();
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for ( int i = 0; i < ROMAN_LETTERS.length; i++ )
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{
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String letter = ROMAN_LETTERS[i];
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int value = ROMAN_VALUES[i];
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while ( number >= value )
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{
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number -= value;
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result.append( letter );
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}
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}
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return result.toString();
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}
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}
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