TIKA-4444: get subject from xmp + add tests

Author: THausherr

tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-pdf-module/src/main/java/org/apache/tika/parser/pdf/PDMetadataExtractor.java

@@ -124,6 +124,7 @@ private static void extractDublin(XMPMetadata xmp, Metadata metadata) {
             extractDublinCoreListItems(metadata, TikaCoreProperties.PUBLISHER, dcSchema);
             extractDublinCoreListItems(metadata, TikaCoreProperties.RELATION, dcSchema);
             extractDublinCoreSimpleItem(metadata, TikaCoreProperties.SOURCE, dcSchema);
+            extractDublinCoreListItems(metadata, TikaCoreProperties.SUBJECT, dcSchema);
         }
     }
 

tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-pdf-module/src/test/java/org/apache/tika/parser/pdf/CustomTikaXMPTest.java

@@ -59,6 +59,9 @@ public void testPDFX() throws Exception {
     public void testPDFUA() throws Exception {
         Metadata metadata = extract("testPDFUA.xmp");
         assertEquals(1, metadata.getInt(PDF.PDFUAID_PART));
+        String[] subjects = metadata.getValues(TikaCoreProperties.SUBJECT);
+        assertEquals("keywords", subjects[0]);
+        assertEquals("subject", subjects[1]);
     }
 
     @Test
@@ -83,6 +86,12 @@ public void testDublinCore() throws Exception {
         assertEquals("International Union of Thinkology", metadata.get(TikaCoreProperties.PUBLISHER));
         assertEquals("Relation", metadata.get(TikaCoreProperties.RELATION));
         assertEquals("Journal of Thinkology", metadata.get(TikaCoreProperties.SOURCE));
+        String[] subjects = metadata.getValues(TikaCoreProperties.SUBJECT);
+        assertEquals("THOUGHTS", subjects[0]);
+        assertEquals("HAPPINESS", subjects[1]);
+        assertEquals("FEAR", subjects[2]);
+        assertEquals("ANGER", subjects[3]);
+        assertEquals("DESPAIR", subjects[4]);
     }
 
     private Metadata extract(String xmpFileName) throws IOException, TikaException, SAXException {