1 files changed, 72 insertions, 0 deletions
diff --git a/pdf-as-pdfbox-2/src/main/java/at/gv/egiz/pdfas/lib/impl/pdfbox2/placeholder/SignatureFieldsAndPlaceHolderExtractor.java b/pdf-as-pdfbox-2/src/main/java/at/gv/egiz/pdfas/lib/impl/pdfbox2/placeholder/SignatureFieldsAndPlaceHolderExtractor.java
new file mode 100644
index 00000000..ca620aec
--- /dev/null
+++ b/pdf-as-pdfbox-2/src/main/java/at/gv/egiz/pdfas/lib/impl/pdfbox2/placeholder/SignatureFieldsAndPlaceHolderExtractor.java
@@ -0,0 +1,72 @@
+package at.gv.egiz.pdfas.lib.impl.pdfbox2.placeholder;
+
+import at.gv.egiz.pdfas.lib.impl.placeholder.PlaceholderExtractorConstants;
+import at.gv.egiz.pdfas.lib.impl.placeholder.SignaturePlaceholderData;
+import org.apache.pdfbox.pdmodel.PDDocument;
+import org.apache.pdfbox.pdmodel.interactive.digitalsignature.PDSignature;
+import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
+import org.apache.pdfbox.pdmodel.interactive.form.PDField;
+import org.apache.pdfbox.pdmodel.interactive.form.PDSignatureField;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class SignatureFieldsAndPlaceHolderExtractor {
+
+    //Search for empty signature fields
+    public static List<String> findEmptySignatureFields(PDDocument doc)
+    {
+        PDSignature signature;
+        List<PDField> signatureField;
+        List<String> signatureFieldNames = new ArrayList<>();
+        PDAcroForm acroForm = doc.getDocumentCatalog().getAcroForm();
+        if (acroForm != null) {
+            signatureField = acroForm.getFields();
+            for (PDField pdField : signatureField) {
+                if(pdField instanceof PDSignatureField && pdField.getPartialName()!=null)
+                {
+                    signature = ((PDSignatureField) pdField).getSignature();
+                    if(signature == null) signatureFieldNames.add(pdField.getPartialName());
+                }
+            }
+        }
+        return signatureFieldNames;
+    }
+    /*
+    Needed by PDF-OVER
+     */
+    public static SignaturePlaceholderData getNextSignaturePlaceHolder(PDDocument doc) {
+        try {
+            SignaturePlaceholderExtractor signaturePlaceholderExtractor = new SignaturePlaceholderExtractor("1",
+                PlaceholderExtractorConstants.PLACEHOLDER_MATCH_MODE_SORTED, doc);
+            return signaturePlaceholderExtractor.extract(doc, "1",
+                PlaceholderExtractorConstants.PLACEHOLDER_MATCH_MODE_SORTED);
+        } catch (Exception e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public static SignaturePlaceholderData getSignaturePlaceHolder(PDDocument doc, String placeholderId,
+                                                                   int mode) {
+        try {
+            SignaturePlaceholderExtractor signaturePlaceholderExtractor = new SignaturePlaceholderExtractor( placeholderId,
+                mode, doc);
+            return signaturePlaceholderExtractor.extract(doc, placeholderId, mode);
+        } catch (Exception e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public static List<SignaturePlaceholderData> getSignaturePlaceHolderList(PDDocument doc, String placeholderId, int mode) {
+        try {
+            SignaturePlaceholderExtractor signaturePlaceholderExtractor = new SignaturePlaceholderExtractor( placeholderId,
+                mode, doc);
+            return signaturePlaceholderExtractor.extractList(doc, placeholderId, mode);
+        } catch (Exception e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+}