FOP-2499: PDF/UA warnings for nested elements

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1693102 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/pdf/PDFStructElem.java

@@ -21,7 +21,9 @@ package org.apache.fop.pdf;
 
 import java.io.IOException;
 import java.io.OutputStream;
+
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Locale;
 
@@ -244,13 +246,30 @@ public class PDFStructElem extends StructureHierarchyMember
     }
 
     public int output(OutputStream stream) throws IOException {
-        if (getDocument().getProfile().getPDFUAMode().isEnabled()
-                && entries.containsKey("Alt") && "".equals(get("Alt"))) {
-            put("Alt", "No alternate text specified");
+        if (getDocument().getProfile().getPDFUAMode().isEnabled()) {
+            if (entries.containsKey("Alt") && "".equals(get("Alt"))) {
+                put("Alt", "No alternate text specified");
+            } else if (kids != null) {
+                for (PDFObject kid : kids) {
+                    if (kid instanceof PDFStructElem
+                            && !(kid instanceof Placeholder)
+                            && structureType.toString().equals("P")
+                            && isBSLE(((PDFStructElem) kid).getStructureType().toString())) {
+                        structureType = StandardStructureTypes.Grouping.DIV;
+                        put("S", StandardStructureTypes.Grouping.DIV.getName());
+                        break;
+                    }
+                }
+            }
         }
         return super.output(stream);
     }
 
+    private boolean isBSLE(String type) {
+        String[] blseValues = {"Table", "L", "P"};
+        return Arrays.asList(blseValues).contains(type);
+    }
+
     /**
      * Class representing a placeholder for a PDF Structure Element.
      */

test/java/org/apache/fop/accessibility/fo/PDFUAWarningTestCase.java

@@ -0,0 +1,61 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* $Id$ */
+
+package org.apache.fop.accessibility.fo;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import org.xml.sax.helpers.AttributesImpl;
+
+import org.apache.fop.pdf.PDFDocument;
+import org.apache.fop.pdf.PDFFactory;
+import org.apache.fop.pdf.PDFParentTree;
+import org.apache.fop.pdf.PDFStructElem;
+import org.apache.fop.pdf.PDFUAMode;
+import org.apache.fop.render.pdf.PDFStructureTreeBuilder;
+
+public class PDFUAWarningTestCase {
+
+    PDFFactory pdfFactory;
+
+    @Test
+    public void nestedTableWarningTestCase() throws IOException {
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        PDFStructElem emptyElem = new PDFStructElem();
+        PDFStructElem block  = PDFStructureTreeBuilder.createStructureElement("block", emptyElem,
+                new AttributesImpl(), pdfFactory, null);
+        PDFStructureTreeBuilder.createStructureElement("table", block, new AttributesImpl(), pdfFactory, null);
+        block.output(bos);
+        Assert.assertEquals("Div", block.getStructureType().toString());
+    }
+
+    @Before
+    public void setUp() {
+        PDFParentTree tree = new  PDFParentTree();
+        PDFDocument doc = new PDFDocument("");
+        doc.makeStructTreeRoot(tree);
+        doc.getProfile().setPDFUAMode(PDFUAMode.PDFUA_1);
+        pdfFactory = new PDFFactory(doc);
+    }
+}