From c59c7f4720dfd2a5a241024561b9d2be5aab5778 Mon Sep 17 00:00:00 2001
From: kaloyane <kaloyane>
Date: Fri, 10 Jun 2011 13:54:22 +0000
Subject: [PATCH] [LMS-2290] forgotten utility method commit
SVN: 21673
---
.../cisd/common/collections/CollectionUtils.java | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/common/source/java/ch/systemsx/cisd/common/collections/CollectionUtils.java b/common/source/java/ch/systemsx/cisd/common/collections/CollectionUtils.java
index a8f694e9ed8..9380b254941 100644
--- a/common/source/java/ch/systemsx/cisd/common/collections/CollectionUtils.java
+++ b/common/source/java/ch/systemsx/cisd/common/collections/CollectionUtils.java
@@ -19,6 +19,7 @@ package ch.systemsx.cisd.common.collections;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
+import java.util.Collections;
import java.util.Iterator;
import java.util.List;
@@ -327,4 +328,19 @@ public final class CollectionUtils
}
return filtered;
}
+
+ /**
+ * For a given collection C returns
+ *
+ * <pre>
+ * 1) C when is not null
+ * 2) Empty collection when C is null
+ * </pre>
+ *
+ * This allows e.g. iterating over the collections elements without redundant null checks.
+ */
+ public static <E> Collection<E> nullSafe(Collection<E> list)
+ {
+ return (list != null) ? list : Collections.<E> emptyList();
+ }
}
\ No newline at end of file
--
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