Treat empty literal name as default value tag name.

Related to #394 (8819115).

Author: blackwinter

metafacture-xml/src/main/java/org/metafacture/xml/SimpleXmlEncoder.java

@@ -55,7 +55,7 @@ public final class SimpleXmlEncoder extends DefaultStreamPipe<ObjectReceiver<Str
 
     public static final String DEFAULT_ROOT_TAG = "records";
     public static final String DEFAULT_RECORD_TAG = "record";
-    public static final String DEFAULT_VALUE_TAG = null;
+    public static final String DEFAULT_VALUE_TAG = "";
 
     private static final String NEW_LINE = "\n";
     private static final String INDENT = "\t";
@@ -211,7 +211,7 @@ public void endEntity() {
 
     @Override
     public void literal(final String name, final String value) {
-        if (name.isEmpty() || name.equals(valueTag)) {
+        if (name.equals(valueTag)) {
             element.setText(value);
         }
         else if (name.startsWith(attributeMarker)) {

metafacture-xml/src/test/java/org/metafacture/xml/SimpleXmlEncoderTest.java

@@ -180,7 +180,7 @@ public void shouldAddNamespaceWithEmptyKeyFromPropertiesFileAsDefaultNamespaceTo
     }
 
     @Test
-    public void testShouldEncodeEmptyLiteralsAsText() {
+    public void testShouldEncodeUnnamedLiteralsAsText() {
         simpleXmlEncoder.startRecord("");
         simpleXmlEncoder.literal("", VALUE);
         simpleXmlEncoder.endRecord();
@@ -195,6 +195,25 @@ public void testShouldEncodeEmptyLiteralsAsText() {
                 getResultXml());
     }
 
+    @Test
+    public void testShouldStillEncodeUnnamedLiteralsAsTextWithConfiguredValueTagName() {
+        simpleXmlEncoder.setValueTag("data");
+
+        simpleXmlEncoder.startRecord("");
+        simpleXmlEncoder.literal("", VALUE);
+        simpleXmlEncoder.endRecord();
+        simpleXmlEncoder.closeStream();
+
+        // SimpleXmlEncoder.Element.writeElement() does not write child elements with empty name
+        assertEquals("<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
+                "<records>" +
+                "<record>" +
+                "value" +
+                "</record>" +
+                "</records>",
+                getResultXml());
+    }
+
     @Test
     public void testShouldNotEncodeLiteralsWithDifferentValueTagNameAsText() {
         simpleXmlEncoder.setValueTag("data");