1 files changed, 71 insertions, 0 deletions
diff --git a/java/common/src/main/java/org/apache/qpid/SecurityHelper.java b/java/common/src/main/java/org/apache/qpid/SecurityHelper.java
new file mode 100644
index 0000000000..dda5a6506d
--- /dev/null
+++ b/java/common/src/main/java/org/apache/qpid/SecurityHelper.java
@@ -0,0 +1,71 @@
+/*
+ *
+ * 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;
+
+import java.io.UnsupportedEncodingException;
+import java.util.HashSet;
+import java.util.List;
+import java.util.StringTokenizer;
+
+import org.apache.qpid.security.AMQPCallbackHandler;
+import org.apache.qpid.security.CallbackHandlerRegistry;
+
+public class SecurityHelper
+{
+    public static String chooseMechanism(List<Object> mechanisms) throws UnsupportedEncodingException
+    {
+        HashSet mechanismSet = new HashSet();
+        for (Object m : mechanisms)
+        {
+            mechanismSet.add(m);
+        }
+
+        String preferredMechanisms = CallbackHandlerRegistry.getInstance().getMechanisms();
+        StringTokenizer prefTokenizer = new StringTokenizer(preferredMechanisms, " ");
+        while (prefTokenizer.hasMoreTokens())
+        {
+            String mech = prefTokenizer.nextToken();
+            if (mechanismSet.contains(mech))
+            {
+                return mech;
+            }
+        }
+        return null;
+    }
+
+    public static AMQPCallbackHandler createCallbackHandler(String mechanism, String username,String password)
+            throws QpidException
+    {
+        Class mechanismClass = CallbackHandlerRegistry.getInstance().getCallbackHandlerClass(mechanism);
+        try
+        {
+            Object instance = mechanismClass.newInstance();
+            AMQPCallbackHandler cbh = (AMQPCallbackHandler) instance;
+            cbh.initialise(username,password);
+            return cbh;
+        }
+        catch (Exception e)
+        {
+            throw new QpidException("Unable to create callback handler: " + e,ErrorCode.UNDEFINED, e.getCause());
+        }
+    }
+
+}