added alt text

git-svn-id: https://joinup.ec.europa.eu/svn/pdf-as/trunk@599 7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c

1 files changed, 37 insertions, 4 deletions

diff --git a/src/main/java/at/knowcenter/wag/egov/egiz/pdf/StructContentHelper.java b/src/main/java/at/knowcenter/wag/egov/egiz/pdf/StructContentHelper.java
index 07f2328..19a32ac 100644
--- a/src/main/java/at/knowcenter/wag/egov/egiz/pdf/StructContentHelper.java
+++ b/src/main/java/at/knowcenter/wag/egov/egiz/pdf/StructContentHelper.java
@@ -3,7 +3,10 @@ package at.knowcenter.wag.egov.egiz.pdf;
 import org.apache.log4j.Logger;

 

 import at.gv.egiz.pdfas.exceptions.ErrorCode;

+import at.gv.egiz.pdfas.framework.signator.SignatorInformation;

+import at.knowcenter.wag.egov.egiz.exceptions.InvalidIDException;

 import at.knowcenter.wag.egov.egiz.exceptions.PresentableException;

+import at.knowcenter.wag.egov.egiz.sig.SignatureObject;

 

 import com.lowagie.text.pdf.PdfArray;

 import com.lowagie.text.pdf.PdfContentByte;

@@ -15,17 +18,21 @@ import com.lowagie.text.pdf.PdfNumber;
 import com.lowagie.text.pdf.PdfObject;

 import com.lowagie.text.pdf.PdfStamper;

 import com.lowagie.text.pdf.PdfStamperImp;

+import com.lowagie.text.pdf.PdfString;

 

 /**

  * Helper class for writing the structure hierarchy of the signature elements.

  * Everything is written with the PdfObject low level API because there is no better support.

  * The structured content is only written for structured (==tagged) input documents. The methods have to be called in the 

- * defined order. The object cannot be reused for several signatures.

+ * defined order. The object cannot be reused for several signatures.<br>

+ * See pdf spec "Logical Structure" for details.

  * @author exthex

  * 

  */

 public class StructContentHelper {

    private static Logger logger = Logger.getLogger(StructContentHelper.class);

+   

+   private final static String ALT_TEXT_KEY = "sigBlockAltText"; 

       

    private int nextMcid = 0;

    private boolean isTagged = false;

@@ -49,8 +56,7 @@ public class StructContentHelper {
     * Create and write structured content for signature block

     * @throws PresentableException

     */

-   void buildMainStructData() throws PresentableException {

-      // TODO titel/alttext woher?

+   void buildMainStructData(SignatureObject so, SignatorInformation si) throws PresentableException {

 

       try {

 

@@ -137,7 +143,7 @@ public class StructContentHelper {
          newStruct.put(PdfName.TYPE, new PdfName("StructElem"));

 

          newStruct.put(PdfName.PG, page.getIndRef());

-         //newStruct.put(PdfName.ALT, new PdfString("meine feiner signaturblock alttext"));

+         newStruct.put(PdfName.ALT, new PdfString(createAltText(so, si)));

          newStruct.put(PdfName.K, new PdfNumber(nextMcid));

 

 

@@ -273,5 +279,32 @@ public class StructContentHelper {
    private PdfDictionary getStructTreeRoot() {

       return stamper.getReader().getCatalog().getAsDict(PdfName.STRUCTTREEROOT);

    }

+   

+   private String createAltText(SignatureObject so, SignatorInformation si) {

+      String profileId = so.getSignatureTypeDefinition().getType();

+      String res = getAltText(profileId); // ask config for alt text

+      if (res == null) {

+         // make default alt text

+         StringBuilder sb = new StringBuilder("PDF-AS Signatur");

+                  

+         try {            

+            if (so != null && so.getKZ() != null) {

+               sb.append(". ").append(so.getKZ().toString());

+            } else if (si != null) {

+               sb.append(". ").append(si.getSignSignatureObject().kz);

+            }            

+         } catch (InvalidIDException e) {

+            logger.debug("error reading signature method for alt text string");          

+         }

+         sb.append(". ").append(profileId);

+         res = sb.toString();

+      }

+      return res;

+   }

+   

+   public static String getAltText(String sigProfile) {

+      return AdobeSignatureHelper.getDefaultableConfigProperty(sigProfile, ALT_TEXT_KEY, null);

+   }

+   

 

 }