FOP-2762: Serialisation issues with accessibility and conserve-memory

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1862557 13f79535-47bb-0310-9956-ffa450edef68

fop-core/src/main/java/org/apache/fop/pdf/PDFName.java

@@ -21,14 +21,16 @@ package org.apache.fop.pdf;
 
 import java.io.IOException;
 import java.io.OutputStream;
+import java.io.Serializable;
 
 import org.apache.commons.io.output.CountingOutputStream;
 
 /**
  * Class representing a PDF name object.
  */
-public class PDFName extends PDFObject {
+public class PDFName extends PDFObject implements Serializable {
 
+    private static final long serialVersionUID = -968412396459739925L;
     private String name;
 
     /**

fop-core/src/main/java/org/apache/fop/pdf/PDFStructElem.java

@@ -22,6 +22,7 @@ package org.apache.fop.pdf;
 import java.io.IOException;
 import java.io.OutputStream;
 
+import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -35,8 +36,9 @@ import org.apache.fop.util.LanguageTags;
  * Class representing a PDF Structure Element.
  */
 public class PDFStructElem extends StructureHierarchyMember
-        implements StructureTreeElement, CompressedObject {
+        implements StructureTreeElement, CompressedObject, Serializable {
 
+    private static final long serialVersionUID = -3055241807589202532L;
     private StructureType structureType;
 
     protected PDFStructElem parentElement;
@@ -246,7 +248,7 @@ public class PDFStructElem extends StructureHierarchyMember
     }
 
     public int output(OutputStream stream) throws IOException {
-        if (getDocument().getProfile().getPDFUAMode().isEnabled()) {
+        if (getDocument() != null && getDocument().getProfile().getPDFUAMode().isEnabled()) {
             if (entries.containsKey("Alt") && "".equals(get("Alt"))) {
                 put("Alt", "No alternate text specified");
             } else if (kids != null) {
@@ -275,6 +277,8 @@ public class PDFStructElem extends StructureHierarchyMember
      */
     public static class Placeholder extends PDFStructElem {
 
+        private static final long serialVersionUID = -2397980642558372068L;
+
         @Override
         public void outputInline(OutputStream out, StringBuilder textBuffer) throws IOException {
             if (kids != null) {

fop-core/src/main/java/org/apache/fop/pdf/StandardStructureTypes.java

@@ -19,6 +19,7 @@
 
 package org.apache.fop.pdf;
 
+import java.io.Serializable;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -98,8 +99,9 @@ public final class StandardStructureTypes {
         public static final StructureType FORM = new StructureTypeImpl("Form");
     }
 
-    private static class StructureTypeImpl implements StructureType {
+    private static class StructureTypeImpl implements StructureType, Serializable {
 
+        private static final long serialVersionUID = 8577475043360334210L;
         private final PDFName name;
 
         protected StructureTypeImpl(String name) {

fop-core/src/main/java/org/apache/fop/render/pdf/PageSequenceStructElem.java

@@ -29,6 +29,7 @@ import org.apache.fop.pdf.StructureType;
 
 public class PageSequenceStructElem extends PDFStructElem {
 
+    private static final long serialVersionUID = -9146602678931267198L;
     private List<PDFStructElem> regionBefores = new ArrayList<PDFStructElem>();
 
     private List<PDFStructElem> regionAfters = new ArrayList<PDFStructElem>();

fop-core/src/main/java/org/apache/fop/render/pdf/TableStructElem.java

@@ -25,6 +25,7 @@ import org.apache.fop.pdf.StructureType;
 
 class TableStructElem extends PDFStructElem {
 
+    private static final long serialVersionUID = -3550873504343680465L;
     private PDFStructElem tableFooter;
 
     public TableStructElem(PDFObject parent, StructureType structureType) {

fop-core/src/test/java/org/apache/fop/render/ConserveMemoryTestCase.java

@@ -58,6 +58,7 @@ public class ConserveMemoryTestCase {
         FopFactory fopFactory = FopFactory.newInstance(new File(".").toURI());
         FOUserAgent userAgent = fopFactory.newFOUserAgent();
         userAgent.setConserveMemoryPolicy(true);
+        userAgent.setAccessibility(true);
         Fop fop = fopFactory.newFop("application/pdf", userAgent, new ByteArrayOutputStream());
         Transformer transformer = TransformerFactory.newInstance().newTransformer();
         Source src = new StreamSource(new ByteArrayInputStream(fo.getBytes()));