/**
* 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;
}
private Chunk formatNumber(StyleListProperties listProperties, int value) {
Chunk symbol = new Chunk("", getFont());
StyleTextProperties textProperties = listProperties.getTextProperties();
if (textProperties != null) {
Font font = textProperties.getFont();
if (font != null) {
symbol.setFont(font);
}
}
StyleNumFormat numFormat = listProperties.getNumFormat();
if (numFormat != null) {
StringBuilder sbuf = new StringBuilder();
// num-prefix
String numPrefix = listProperties.getNumPrefix();
if (numPrefix != null) {
sbuf.append(numPrefix);
}
// number
if (numFormat.isAlphabetical()) {
sbuf.append(RomanAlphabetFactory.getString(value, numFormat.isLowercase()));
} else if (numFormat.isRoman()) {
sbuf.append(RomanNumberFactory.getString(value, numFormat.isLowercase()));
} else {
sbuf.append(value);
}
// num-suffix
String numSuffix = listProperties.getNumSuffix();
if (numSuffix != null) {
sbuf.append(numSuffix);
}
symbol.append(sbuf.toString());
}
return symbol;
}