--- a/common/core/src/main/java/com/redhat/thermostat/common/utils/StringUtils.java	Mon Mar 30 13:50:51 2015 -0400
+++ b/common/core/src/main/java/com/redhat/thermostat/common/utils/StringUtils.java	Mon Mar 30 09:55:30 2015 -0400
@@ -66,5 +66,16 @@
         return builder.toString();
     }
 
+    public static String join(String delimiter, Iterable<? extends CharSequence> items) {
+        StringBuilder result = new StringBuilder();
+        for (CharSequence item : items) {
+            if (result.length() != 0) {
+                result.append(delimiter);
+            }
+            result.append(item);
+        }
+
+        return result.toString();
+    }
 }
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/common/core/src/test/java/com/redhat/thermostat/common/utils/StringUtilsTest.java	Mon Mar 30 09:55:30 2015 -0400
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2012-2015 Red Hat, Inc.
+ *
+ * This file is part of Thermostat.
+ *
+ * Thermostat is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2, or (at your
+ * option) any later version.
+ *
+ * Thermostat is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Thermostat; see the file COPYING.  If not see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Linking this code with other modules is making a combined work
+ * based on this code.  Thus, the terms and conditions of the GNU
+ * General Public License cover the whole combination.
+ *
+ * As a special exception, the copyright holders of this code give
+ * you permission to link this code with independent modules to
+ * produce an executable, regardless of the license terms of these
+ * independent modules, and to copy and distribute the resulting
+ * executable under terms of your choice, provided that you also
+ * meet, for each linked independent module, the terms and conditions
+ * of the license of that module.  An independent module is a module
+ * which is not derived from or based on this code.  If you modify
+ * this code, you may extend this exception to your version of the
+ * library, but you are not obligated to do so.  If you do not wish
+ * to do so, delete this exception statement from your version.
+ */
+
+package com.redhat.thermostat.common.utils;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.junit.Test;
+
+public class StringUtilsTest {
+
+    @Test
+    public void testJoining() {
+        assertEquals("", StringUtils.join("", list()));
+        assertEquals("a", StringUtils.join("-", list("a")));
+        assertEquals("a, b", StringUtils.join(", ", list("a", "b")));
+        assertEquals("a:b", StringUtils.join(":", list("a", "b")));
+        assertEquals("a:b:", StringUtils.join(":", list("a", "b", "")));
+    }
+
+    static List<String> list(String... items) {
+        if (items == null) {
+            return new ArrayList<String>();
+        } else {
+            return Arrays.asList(items);
+        }
+    }
+}