JAMES-2366 Use Optional for computing mapping size

It avoids variable reallocation


Project: http://git-wip-us.apache.org/repos/asf/james-project/repo
Commit: http://git-wip-us.apache.org/repos/asf/james-project/commit/57fa4c48
Tree: http://git-wip-us.apache.org/repos/asf/james-project/tree/57fa4c48
Diff: http://git-wip-us.apache.org/repos/asf/james-project/diff/57fa4c48

Branch: refs/heads/master
Commit: 57fa4c48418a3cf617b8921187e21fa942c4e4ae
Parents: 2001f8c
Author: benwa <[email protected]>
Authored: Fri Apr 6 09:52:34 2018 +0700
Committer: benwa <[email protected]>
Committed: Thu Apr 19 11:12:07 2018 +0700

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 .../apache/james/rrt/lib/AbstractRecipientRewriteTable.java  | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
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http://git-wip-us.apache.org/repos/asf/james-project/blob/57fa4c48/server/data/data-library/src/main/java/org/apache/james/rrt/lib/AbstractRecipientRewriteTable.java
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diff --git 
a/server/data/data-library/src/main/java/org/apache/james/rrt/lib/AbstractRecipientRewriteTable.java
 
b/server/data/data-library/src/main/java/org/apache/james/rrt/lib/AbstractRecipientRewriteTable.java
index bb82a8e..873a9d4 100644
--- 
a/server/data/data-library/src/main/java/org/apache/james/rrt/lib/AbstractRecipientRewriteTable.java
+++ 
b/server/data/data-library/src/main/java/org/apache/james/rrt/lib/AbstractRecipientRewriteTable.java
@@ -302,12 +302,12 @@ public abstract class AbstractRecipientRewriteTable 
implements RecipientRewriteT
 
     @Override
     public Map<String, Mappings> getAllMappings() throws 
RecipientRewriteTableException {
-        int count = 0;
         Map<String, Mappings> mappings = getAllMappingsInternal();
 
-        if (mappings != null) {
-            count = mappings.size();
-        }
+        int count = Optional.ofNullable(mappings)
+            .map(Map::size)
+            .orElse(0);
+
         LOGGER.debug("Retrieve all mappings. Mapping count: {}", count);
         return mappings;
     }


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