wms/nflg-qms-pdf-extract/src/main/java/extraction/PositionedTextStripper.java

package extraction;

import model.TextElement;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.text.PDFTextStripper;
import org.apache.pdfbox.text.TextPosition;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class PositionedTextStripper extends PDFTextStripper {
    private final List<TextElement> elements = new ArrayList<>();
    private int currentPage = 0;
    private float currentPageWidth = 0;
    private float currentPageHeight = 0;

    @Override
    protected void startPage(PDPage page) throws IOException {
        currentPage++;
        PDRectangle mediaBox = page.getMediaBox();
        currentPageWidth = mediaBox.getWidth();
        currentPageHeight = mediaBox.getHeight();
        super.startPage(page);
    }

    @Override
    protected void writeString(String text, List<TextPosition> textPositions) throws IOException {
        if (textPositions == null || textPositions.isEmpty()) {
            super.writeString(text, textPositions);
            return;
        }

        TextPosition first = textPositions.get(0);
        TextPosition last = textPositions.get(textPositions.size() - 1);

        TextElement elem = new TextElement();
        elem.setText(text.trim());
        elem.setPageNum(currentPage);
        elem.setX(first.getX());
        elem.setY(first.getY());
        elem.setWidth(Math.abs((last.getX() + last.getWidth()) - first.getX()));
        elem.setHeight(Math.max(1, Math.abs(first.getHeight())));
        elem.setFontSize(first.getFontSizeInPt());
        elem.setPageWidth(currentPageWidth);
        elem.setPageHeight(currentPageHeight);

        if (!elem.getText().isEmpty()) {
            elements.add(elem);
        }

        super.writeString(text, textPositions);
    }

    public List<TextElement> getElements() {
        return elements;
    }
}