| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (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.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* $Id$ */ |
| |
| package org.apache.fop.pdf; |
| |
| import java.util.regex.Pattern; |
| |
| /** |
| * Class representing a PDF /PageLabels dictionary. |
| */ |
| public class PDFPageLabels extends PDFNumberTreeNode { |
| |
| private static final int DECIMAL = 1; // '0*1' |
| private static final int LOWER_ALPHA = 2; // 'a' |
| private static final int UPPER_ALPHA = 3; // 'A' |
| private static final int LOWER_ROMAN = 4; // 'i' |
| private static final int UPPER_ROMAN = 5; // 'I' |
| private static final int PREFIX = 6; |
| |
| private static final PDFName S_DECIMAL = new PDFName("D"); |
| private static final PDFName S_UPPER_ROMAN = new PDFName("R"); |
| private static final PDFName S_LOWER_ROMAN = new PDFName("r"); |
| private static final PDFName S_UPPER_ALPHA = new PDFName("A"); |
| private static final PDFName S_LOWER_ALPHA = new PDFName("a"); |
| |
| private static final Pattern MATCH_DECIMAL = Pattern.compile("\\d+"); |
| private static final Pattern MATCH_ROMAN = Pattern.compile( |
| "^M{0,3}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$", Pattern.CASE_INSENSITIVE); |
| private static final Pattern MATCH_LETTER = Pattern.compile("^[a-zA-Z]$"); |
| |
| private int lastPageLabelType; |
| private int lastPageNumber; |
| private String lastZeroPaddingPrefix = ""; |
| |
| /** |
| * Create the /PageLabels dictionary |
| */ |
| public PDFPageLabels() { |
| super(); |
| } |
| |
| /** |
| * Adds a new entry, if necessary, to the /PageLabels dictionary. |
| * @param index the page index (0 for page 1) |
| * @param pageLabel the page number as a string |
| */ |
| public void addPageLabel(int index, String pageLabel) { |
| boolean addNewPageLabel = false; |
| String padding = "00000000"; |
| int currentPageNumber = 0; |
| int currentPageLabelType = 0; |
| String currentZeroPaddingPrefix = ""; |
| if (MATCH_DECIMAL.matcher(pageLabel).matches()) { |
| // since an integer is the most common case we start with that |
| currentPageLabelType = DECIMAL; |
| currentPageNumber = Integer.parseInt(pageLabel); |
| int zeroPadding = 0; |
| if (pageLabel.charAt(zeroPadding) == '0') { |
| do { |
| zeroPadding++; |
| } while (pageLabel.charAt(zeroPadding) == '0'); |
| currentZeroPaddingPrefix = padding.substring(0, zeroPadding); |
| if (currentZeroPaddingPrefix.length() != lastZeroPaddingPrefix.length()) { |
| addNewPageLabel = true; |
| } |
| } else { |
| if (lastZeroPaddingPrefix.length() != 0) { |
| addNewPageLabel = true; |
| } |
| } |
| } else if (MATCH_ROMAN.matcher(pageLabel).matches()) { |
| if (pageLabel.toLowerCase().equals(pageLabel)) { |
| currentPageLabelType = LOWER_ROMAN; |
| } else { |
| currentPageLabelType = UPPER_ROMAN; |
| } |
| currentPageNumber = romanToArabic(pageLabel); |
| } else if (MATCH_LETTER.matcher(pageLabel).matches()) { |
| char c = pageLabel.charAt(0); |
| if (c > 'Z') { |
| currentPageLabelType = LOWER_ALPHA; |
| } else { |
| currentPageLabelType = UPPER_ALPHA; |
| } |
| currentPageNumber = alphabeticToArabic(c); |
| } else { |
| // alphabetic numbering in XSL_FO and labelling in PDF are different after AA (AB versus BB) |
| // we will use the /P (prefix) label in that case |
| currentPageLabelType = PREFIX; |
| addNewPageLabel = true; |
| } |
| if (lastPageLabelType != currentPageLabelType) { |
| addNewPageLabel = true; |
| } |
| if (lastPageNumber != currentPageNumber - 1) { |
| addNewPageLabel = true; |
| } |
| if (addNewPageLabel) { |
| PDFNumsArray nums = getNums(); |
| PDFDictionary dict = new PDFDictionary(nums); |
| PDFName pdfName = null; |
| switch (currentPageLabelType) { |
| case PREFIX: |
| dict.put("P", pageLabel); |
| break; |
| default: |
| switch (currentPageLabelType) { |
| case DECIMAL: |
| pdfName = S_DECIMAL; |
| if (currentZeroPaddingPrefix.length() != 0) { |
| dict.put("P", currentZeroPaddingPrefix); |
| } |
| break; |
| case LOWER_ROMAN: |
| pdfName = S_LOWER_ROMAN; |
| break; |
| case UPPER_ROMAN: |
| pdfName = S_UPPER_ROMAN; |
| break; |
| case LOWER_ALPHA: |
| pdfName = S_LOWER_ALPHA; |
| break; |
| case UPPER_ALPHA: |
| pdfName = S_UPPER_ALPHA; |
| break; |
| default: |
| } |
| dict.put("S", pdfName); |
| if (currentPageNumber != 1) { |
| dict.put("St", currentPageNumber); |
| } |
| } |
| nums.put(index, dict); |
| } |
| lastPageLabelType = currentPageLabelType; |
| lastPageNumber = currentPageNumber; |
| lastZeroPaddingPrefix = currentZeroPaddingPrefix; |
| } |
| |
| private int romanToArabic(String roman) { |
| int arabic = 0; |
| int previousValue = 0; |
| int newValue = 0; |
| String upperRoman = roman.toUpperCase(); |
| for (int i = 0; i < upperRoman.length(); i++) { |
| char romanDigit = upperRoman.charAt(i); |
| switch (romanDigit) { |
| case 'I': |
| newValue = 1; |
| break; |
| case 'V': |
| newValue = 5; |
| break; |
| case 'X': |
| newValue = 10; |
| break; |
| case 'L': |
| newValue = 50; |
| break; |
| case 'C': |
| newValue = 100; |
| break; |
| case 'D': |
| newValue = 500; |
| break; |
| case 'M': |
| newValue = 1000; |
| break; |
| default: |
| } |
| if (previousValue < newValue) { |
| arabic -= previousValue; |
| } else { |
| arabic += previousValue; |
| } |
| previousValue = newValue; |
| } |
| arabic += previousValue; |
| return arabic; |
| } |
| |
| private int alphabeticToArabic(char c) { |
| int arabic = Character.toLowerCase(c) - 'a' + 1; |
| return arabic; |
| } |
| } |