How to skip PDF pages that have already been OCRed when recognizing text in a PDF

If you are OCRing a document where some pages have already been OCRed, you can skip these pages:

TessJNI ocr = new TessJNI();
for (int count = 0; count < pdf.getPageCount(); ++count)
{
    PDFPage page = pdf.getPage(count);
    // if the page already has invisible text, skip it
    if (!page.containsInvisibleText())
    {
        String pageOCR = ocr.performOCR("eng", page, 300);
        page.insert_hOCR(pageOCR, true);
    }
}
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