From dc8b7fd3ecfdcefbaa8625c94ed48a22ce095940 Mon Sep 17 00:00:00 2001
From: pdanner <pdanner@7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c>
Date: Wed, 3 Nov 2010 11:07:58 +0000
Subject: added alt text

git-svn-id: https://joinup.ec.europa.eu/svn/pdf-as/trunk@599 7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c
---
 .../wag/egov/egiz/pdf/StructContentHelper.java     | 41 +++++++++++++++++++---
 1 file 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);
+   }
+   
 
 }
-- 
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