commit for feature developing invert-replace color of a pdf for stirl… (#1982)

commit for feature developing invert-replace color of a pdf for stirling PDF

src/main/java/stirling/software/SPDF/utils/misc/PdfTextStripperCustom.java

@@ -0,0 +1,36 @@
+package stirling.software.SPDF.utils.misc;
+
+import java.awt.geom.Rectangle2D;
+import java.io.IOException;
+import java.util.List;
+
+import org.apache.pdfbox.pdmodel.PDPage;
+import org.apache.pdfbox.text.PDFTextStripperByArea;
+import org.apache.pdfbox.text.TextPosition;
+
+public class PdfTextStripperCustom extends PDFTextStripperByArea {
+
+    /**
+     * Constructor.
+     *
+     * @throws IOException If there is an error loading properties.
+     */
+    public PdfTextStripperCustom() throws IOException {}
+
+    // To process the page text using stripper and returns the TextPosition and its values
+    public List<List<TextPosition>> processPageCustom(PDPage page) throws IOException {
+
+        addRegion(
+                "wholePage",
+                new Rectangle2D.Float(
+                        page.getMediaBox().getLowerLeftX(),
+                        page.getMediaBox().getLowerLeftY(),
+                        page.getMediaBox().getWidth(),
+                        page.getMediaBox().getHeight()));
+        extractRegions(page);
+
+        List<List<TextPosition>> textPositions = getCharactersByArticle();
+
+        return textPositions;
+    }
+}