void doOCROnCurrentPage() throws IOException, TikaException, SAXException {
if (config.getOCRStrategy().equals(NO_OCR)) {
return;
}
TesseractOCRConfig tesseractConfig =
context.get(TesseractOCRConfig.class, DEFAULT_TESSERACT_CONFIG);
TesseractOCRParser tesseractOCRParser = new TesseractOCRParser();
if (!tesseractOCRParser.hasTesseract(tesseractConfig)) {
throw new TikaException(
"Tesseract is not available. "
+ "Please set the OCR_STRATEGY to NO_OCR or configure Tesseract correctly");
}
PDFRenderer renderer = new PDFRenderer(pdDocument);
TemporaryResources tmp = new TemporaryResources();
try {
BufferedImage image = renderer.renderImage(pageIndex, 2.0f, config.getOCRImageType());
Path tmpFile = tmp.createTempFile();
try (OutputStream os = Files.newOutputStream(tmpFile)) {
// TODO: get output format from TesseractConfig
ImageIOUtil.writeImage(image, config.getOCRImageFormatName(), os, config.getOCRDPI());
}
try (InputStream is = TikaInputStream.get(tmpFile)) {
tesseractOCRParser.parseInline(is, xhtml, tesseractConfig);
}
} catch (IOException e) {
handleCatchableIOE(e);
} catch (SAXException e) {
throw new IOExceptionWithCause("error writing OCR content from PDF", e);
} finally {
tmp.dispose();
}
}
@Override
protected void endDocument(PDDocument pdf) throws IOException {
try {
// Extract text for any bookmarks:
extractBookmarkText();
try {
extractEmbeddedDocuments(pdf);
} catch (IOException e) {
handleCatchableIOE(e);
}
// extract acroform data at end of doc
if (config.getExtractAcroFormContent() == true) {
try {
extractAcroForm(pdf);
} catch (IOException e) {
handleCatchableIOE(e);
}
}
xhtml.endDocument();
} catch (TikaException e) {
throw new IOExceptionWithCause("Unable to end a document", e);
} catch (SAXException e) {
throw new IOExceptionWithCause("Unable to end a document", e);
}
}
void handleCatchableIOE(IOException e) throws IOException {
if (config.isCatchIntermediateIOExceptions()) {
String msg = e.getMessage();
if (msg == null) {
msg = "IOException, no message";
}
metadata.add(TikaCoreProperties.TIKA_META_EXCEPTION_WARNING, msg);
exceptions.add(e);
} else {
throw e;
}
}
@Override
protected void endPage(PDPage page) throws IOException {
try {
EmbeddedDocumentExtractor extractor = getEmbeddedDocumentExtractor();
for (PDAnnotation annotation : page.getAnnotations()) {
if (annotation instanceof PDAnnotationFileAttachment) {
PDAnnotationFileAttachment fann = (PDAnnotationFileAttachment) annotation;
PDComplexFileSpecification fileSpec = (PDComplexFileSpecification) fann.getFile();
try {
extractMultiOSPDEmbeddedFiles(fann.getAttachmentName(), fileSpec, extractor);
} catch (SAXException e) {
throw new IOExceptionWithCause("file embedded in annotation sax exception", e);
} catch (TikaException e) {
throw new IOExceptionWithCause("file embedded in annotation tika exception", e);
} catch (IOException e) {
handleCatchableIOE(e);
}
}
// TODO: remove once PDFBOX-1143 is fixed:
if (config.getExtractAnnotationText()) {
if (annotation instanceof PDAnnotationLink) {
PDAnnotationLink annotationlink = (PDAnnotationLink) annotation;
if (annotationlink.getAction() != null) {
PDAction action = annotationlink.getAction();
if (action instanceof PDActionURI) {
// can't currently associate link to text.
// for now, extract link and repeat the link as if it
// were the visible text
PDActionURI uri = (PDActionURI) action;
String link = uri.getURI();
if (link != null && link.trim().length() > 0) {
xhtml.startElement("div", "class", "annotation");
xhtml.startElement("a", "href", link);
xhtml.characters(link);
xhtml.endElement("a");
xhtml.endElement("div");
}
}
}
}
if (annotation instanceof PDAnnotationMarkup) {
PDAnnotationMarkup annotationMarkup = (PDAnnotationMarkup) annotation;
String title = annotationMarkup.getTitlePopup();
String subject = annotationMarkup.getSubject();
String contents = annotationMarkup.getContents();
// TODO: maybe also annotationMarkup.getRichContents()?
if (title != null || subject != null || contents != null) {
xhtml.startElement("div", "class", "annotation");
if (title != null) {
xhtml.startElement("div", "class", "annotationTitle");
xhtml.characters(title);
xhtml.endElement("div");
}
if (subject != null) {
xhtml.startElement("div", "class", "annotationSubject");
xhtml.characters(subject);
xhtml.endElement("div");
}
if (contents != null) {
xhtml.startElement("div", "class", "annotationContents");
xhtml.characters(contents);
xhtml.endElement("div");
}
xhtml.endElement("div");
}
}
}
}
if (config.getOCRStrategy().equals(PDFParserConfig.OCR_STRATEGY.OCR_AND_TEXT_EXTRACTION)) {
doOCROnCurrentPage();
}
xhtml.endElement("div");
} catch (SAXException | TikaException e) {
throw new IOExceptionWithCause("Unable to end a page", e);
} catch (IOException e) {
exceptions.add(e);
} finally {
pageIndex++;
}
}