Reset once, not twice, when resetted once (#543)

By not calling the pipe (aka wrapper) but the receiver directly
the stream is only once resetted when called once.

(In conjunction with ObjectFileWriter and StreamBatchResetter this bug
had resulted in as many empty files as non-empty ones.)

metafacture-biblio/src/main/java/org/metafacture/biblio/marc21/MarcXmlEncoder.java

@@ -212,7 +212,7 @@ public void literal(final String name, final String value) {
 
     @Override
     protected void onResetStream() {
-        pipe.resetStream();
+        encoder.onResetStream();
     }
 
     @Override

metafacture-biblio/src/test/java/org/metafacture/biblio/marc21/MarcXmlEncoderTest.java

@@ -51,6 +51,7 @@ public class MarcXmlEncoderTest {
     private static final String RECORD_ID = "92005291";
 
     private static StringBuilder resultCollector;
+    private static int resultCollectorsResetStreamCount;
     private static MarcXmlEncoder encoder;
 
     @Before
@@ -62,6 +63,11 @@ public void setUp() {
             public void process(final String obj) {
                 resultCollector.append(obj);
             }
+            @Override
+            public void resetStream() {
+                ++resultCollectorsResetStreamCount;
+            }
+
         });
         resultCollector = new StringBuilder();
     }
@@ -396,4 +402,19 @@ public void issue543_shouldNotWriteFooterWhenRecordIsEmpty() {
         assertTrue(actual.isEmpty());
     }
 
+    @Test
+    public void issue543_shouldOnlyResetStreamOnce() {
+        resultCollectorsResetStreamCount = 0;
+        encoder.resetStream();
+        assertEquals(resultCollectorsResetStreamCount, 1);
+    }
+
+    @Test
+    public void issue543_shouldOnlyResetStreamOnceUsingWrapper() {
+        resultCollectorsResetStreamCount = 0;
+        encoder.setEnsureCorrectMarc21Xml(true);
+        encoder.resetStream();
+        assertEquals(resultCollectorsResetStreamCount, 1);
+    }
+
 }