1 files changed, 53 insertions, 0 deletions
diff --git a/java/broker-plugins/management-http/src/main/java/org/apache/qpid/server/management/plugin/servlet/rest/KeyComparator.java b/java/broker-plugins/management-http/src/main/java/org/apache/qpid/server/management/plugin/servlet/rest/KeyComparator.java
new file mode 100644
index 0000000000..3d862ce321
--- /dev/null
+++ b/java/broker-plugins/management-http/src/main/java/org/apache/qpid/server/management/plugin/servlet/rest/KeyComparator.java
@@ -0,0 +1,53 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+package org.apache.qpid.server.management.plugin.servlet.rest;
+
+import java.util.Comparator;
+import java.util.Map;
+
+class KeyComparator implements Comparator<Map>
+{
+    private String _key;
+
+    public KeyComparator(final String key)
+    {
+        _key = key;
+    }
+
+    public int compare(final Map o1, final Map o2)
+    {
+        Comparable left = (Comparable) o1.get(_key);
+        Comparable right = (Comparable) o2.get(_key);
+
+        int result;
+        if(left == null)
+        {
+            result =  right == null ? 0 : -1;
+        }
+        else
+        {
+            result = left.compareTo(right);
+        }
+
+        return result;
+
+    }
+}