fixes #47

wumpz · wumpz · commit ae2340874806 · 2020-02-23T23:51:28.000+01:00
diff --git a/java-diff-utils/src/main/java/com/github/difflib/UnifiedDiffUtils.java b/java-diff-utils/src/main/java/com/github/difflib/UnifiedDiffUtils.java
@@ -21,6 +21,7 @@
 import com.github.difflib.patch.Patch;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Optional;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -130,8 +131,8 @@ public static List<String> generateUnifiedDiff(String originalFileName,
             int contextSize) {
         if (!patch.getDeltas().isEmpty()) {
             List<String> ret = new ArrayList<>();
-            ret.add("--- " + originalFileName);
-            ret.add("+++ " + revisedFileName);
+            ret.add("--- " + Optional.ofNullable(originalFileName).orElse(""));
+            ret.add("+++ " + Optional.ofNullable(revisedFileName).orElse(""));
 
             List<AbstractDelta<String>> patchDeltas = new ArrayList<>(
                     patch.getDeltas());
diff --git a/java-diff-utils/src/test/java/com/github/difflib/GenerateUnifiedDiffTest.java b/java-diff-utils/src/test/java/com/github/difflib/GenerateUnifiedDiffTest.java
@@ -120,7 +120,7 @@ public void testNewFileCreation() throws DiffException {
         List<String> udiff = UnifiedDiffUtils.generateUnifiedDiff(null, "revised",
                 original, patch, 10);
         
-        assertEquals("--- null", udiff.get(0));
+        assertEquals("--- ", udiff.get(0));
         assertEquals("+++ revised", udiff.get(1));
         assertEquals("@@ -0,0 +1,2 @@", udiff.get(2));
         
