/**
* Gets the page label dictionary to insert into the document.
*
* @return the page label dictionary
*/
public PdfDictionary getDictionary(PdfWriter writer) {
try {
return PdfNumberTree.writeTree(map, writer);
} catch (IOException e) {
throw new ExceptionConverter(e);
}
}
/**
* Retrieves the page labels from a PDF as an array of String objects.
*
* @param reader a PdfReader object that has the page labels you want to retrieve
* @return a String array or <code>null</code> if no page labels are present
*/
public static String[] getPageLabels(PdfReader reader) {
int n = reader.getNumberOfPages();
PdfDictionary dict = reader.getCatalog();
PdfDictionary labels =
(PdfDictionary) PdfReader.getPdfObjectRelease(dict.get(PdfName.PAGELABELS));
if (labels == null) return null;
String[] labelstrings = new String[n];
HashMap<Integer, PdfObject> numberTree = PdfNumberTree.readTree(labels);
int pagecount = 1;
Integer current;
String prefix = "";
char type = 'D';
for (int i = 0; i < n; i++) {
current = Integer.valueOf(i);
if (numberTree.containsKey(current)) {
PdfDictionary d = (PdfDictionary) PdfReader.getPdfObjectRelease(numberTree.get(current));
if (d.contains(PdfName.ST)) {
pagecount = ((PdfNumber) d.get(PdfName.ST)).intValue();
} else {
pagecount = 1;
}
if (d.contains(PdfName.P)) {
prefix = ((PdfString) d.get(PdfName.P)).toUnicodeString();
}
if (d.contains(PdfName.S)) {
type = ((PdfName) d.get(PdfName.S)).toString().charAt(1);
} else {
type = 'e';
}
}
switch (type) {
default:
labelstrings[i] = prefix + pagecount;
break;
case 'R':
labelstrings[i] = prefix + RomanNumberFactory.getUpperCaseString(pagecount);
break;
case 'r':
labelstrings[i] = prefix + RomanNumberFactory.getLowerCaseString(pagecount);
break;
case 'A':
labelstrings[i] = prefix + RomanAlphabetFactory.getUpperCaseString(pagecount);
break;
case 'a':
labelstrings[i] = prefix + RomanAlphabetFactory.getLowerCaseString(pagecount);
break;
case 'e':
labelstrings[i] = prefix;
break;
}
pagecount++;
}
return labelstrings;
}
/**
* Retrieves the page labels from a PDF as an array of {@link PdfPageLabelFormat} objects.
*
* @param reader a PdfReader object that has the page labels you want to retrieve
* @return a PdfPageLabelEntry array, containing an entry for each format change or <code>null
* </code> if no page labels are present
*/
public static PdfPageLabelFormat[] getPageLabelFormats(PdfReader reader) {
PdfDictionary dict = reader.getCatalog();
PdfDictionary labels =
(PdfDictionary) PdfReader.getPdfObjectRelease(dict.get(PdfName.PAGELABELS));
if (labels == null) return null;
HashMap<Integer, PdfObject> numberTree = PdfNumberTree.readTree(labels);
Integer numbers[] = new Integer[numberTree.size()];
numbers = numberTree.keySet().toArray(numbers);
Arrays.sort(numbers);
PdfPageLabelFormat[] formats = new PdfPageLabelFormat[numberTree.size()];
String prefix;
int numberStyle;
int pagecount;
for (int k = 0; k < numbers.length; ++k) {
Integer key = numbers[k];
PdfDictionary d = (PdfDictionary) PdfReader.getPdfObjectRelease(numberTree.get(key));
if (d.contains(PdfName.ST)) {
pagecount = ((PdfNumber) d.get(PdfName.ST)).intValue();
} else {
pagecount = 1;
}
if (d.contains(PdfName.P)) {
prefix = ((PdfString) d.get(PdfName.P)).toUnicodeString();
} else {
prefix = "";
}
if (d.contains(PdfName.S)) {
char type = ((PdfName) d.get(PdfName.S)).toString().charAt(1);
switch (type) {
case 'R':
numberStyle = UPPERCASE_ROMAN_NUMERALS;
break;
case 'r':
numberStyle = LOWERCASE_ROMAN_NUMERALS;
break;
case 'A':
numberStyle = UPPERCASE_LETTERS;
break;
case 'a':
numberStyle = LOWERCASE_LETTERS;
break;
default:
numberStyle = DECIMAL_ARABIC_NUMERALS;
break;
}
} else {
numberStyle = EMPTY;
}
formats[k] = new PdfPageLabelFormat(key.intValue() + 1, numberStyle, prefix, pagecount);
}
return formats;
}
