Groovy Script to extract pdf text from highlight annotations using PDFBOX library. Useful in Freeplane scripts

getPDFHighlights.groovy

//@ExecutionModes({ON_ALL_SELECTED_NODES})
// Author: Otavio Camargo @ameisehaufen

@Grab(group='org.apache.pdfbox', module='pdfbox', version='2.0.22')
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotation;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationMarkup;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationText;
import org.apache.pdfbox.text.PDFTextStripperByArea;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import java.awt.geom.Rectangle2D;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.PDDocumentCatalog;
import org.apache.pdfbox.pdmodel.interactive.documentnavigation.outline.PDDocumentOutline;

// PDDocument document = new PDDocument();
String pdfFilePath = 'temp.pdf'
PDDocument pdfDoc = PDDocument.load(new File(pdfFilePath));
ArrayList<String> highlightedTexts = new ArrayList<>();

int pageNum=0;
for( PDPage pdfpage : pdfDoc.getPages()-60 )
{
    pageNum++;
    List<PDAnnotation> annotations = pdfpage.getAnnotations();
    //first setup text extraction regions
    for( int i=0; i<annotations.size(); i++ )
    {
        PDAnnotation annot = annotations.get(i);
        annotNote = annot.getContents(); // Conteudo anotado na nota
        annotSubType = annot.getSubtype() // Tipo da nota (Highlight, Text)
        // annotTitle = annot.getTitlePopup(); // Autor da nota
        if( annotSubType.equals('Highlight') )
        {
        // extract highlighted text
            PDFTextStripperByArea stripper = new PDFTextStripperByArea();
            COSArray quadsArray = (COSArray) annot.getCOSObject().getCOSArray(COSName.getPDFName("QuadPoints"));
            String str = null;
            for(int j=1, k=0; j<=(quadsArray.size()/8); j++) {
                Float ULX = quadsArray.get(0+k).floatValue();
                Float ULY = quadsArray.get(1+k).floatValue();
                Float URX = quadsArray.get(2+k).floatValue();
                Float URY = quadsArray.get(3+k).floatValue();
                Float LLX = quadsArray.get(4+k).floatValue();
                Float LLY = quadsArray.get(5+k).floatValue();
                Float LRX = quadsArray.get(6+k).floatValue();
                Float LRY = quadsArray.get(7+k).floatValue();
                k+=8;
                float ulx = ULX - 1; // upper left x.
                float uly = ULY; // upper left y.
                float width = URX - LLX;          // calculated by upperRightX - lowerLeftX.
                float height = URY - LLY;         // calculated by upperRightY - lowerLeftY.

                PDRectangle pageSize = pdfpage.getMediaBox();
                uly = pageSize.getHeight() - uly;

                Rectangle2D.Float rectangle_2 = new Rectangle2D.Float(ulx, uly, width, height);
                stripper.addRegion("highlightedRegion", rectangle_2);
                stripper.extractRegions(pdfpage);
                String highlightedText = stripper.getTextForRegion("highlightedRegion").replaceAll("[\\n\\t ]+", " ");

                if(j > 1) {
                    str = str.concat(highlightedText);
                } else {
                    str = highlightedText;
                }
            }
            highlightedTexts.add(str);
            logInfo = str;

            logMsg=">>>>>>>>>>Pagina: " + pageNum + ", Sessão: " + annotNote + ", Nota: " + annotNote + "Texto sublinhado: " + logInfo;
            logger.info(logMsg);
        }
    }

}
pdfDoc.close();