FsckError.CorruptObject: Use @Nullable constructor for errorType

errorType is already null in the caller and callee when unknown, so we
can replace a conditional call to a setter in the only caller with an
unconditionally provided @Nullable constructor parameter.

As a bonus, this lets us mark the field as final.

Change-Id: Ie2f929180e74ffa1aba8ec6caccfa81fbd8bfc04
Signed-off-by: Ivan Frade <ifrade@google.com>

org.eclipse.jgit/src/org/eclipse/jgit/internal/fsck/FsckError.java

@@ -61,20 +61,20 @@ public class FsckError {
 
 		final int type;
 
-		ObjectChecker.ErrorType errorType;
+		final @Nullable ObjectChecker.ErrorType errorType;
 
 		/**
 		 * @param id
 		 *            the object identifier.
 		 * @param type
 		 *            type of the object.
+		 * @param errorType
+		 *            kind of error
 		 */
-		public CorruptObject(ObjectId id, int type) {
+		public CorruptObject(ObjectId id, int type,
+				@Nullable ObjectChecker.ErrorType errorType) {
 			this.id = id;
 			this.type = type;
-		}
-
-		void setErrorType(ObjectChecker.ErrorType errorType) {
 			this.errorType = errorType;
 		}
 

org.eclipse.jgit/src/org/eclipse/jgit/internal/fsck/FsckPackParser.java

@@ -174,12 +174,8 @@ public class FsckPackParser extends PackParser {
 		try {
 			super.verifySafeObject(id, type, data);
 		} catch (CorruptObjectException e) {
-			// catch the exception and continue parse the pack file
-			CorruptObject o = new CorruptObject(id.toObjectId(), type);
-			if (e.getErrorType() != null) {
-				o.setErrorType(e.getErrorType());
-			}
-			corruptObjects.add(o);
+			corruptObjects.add(
+					new CorruptObject(id.toObjectId(), type, e.getErrorType()));
 		}
 	}