1 files changed, 38 insertions, 0 deletions
diff --git a/trunk/qpid/java/broker/src/main/java/org/apache/qpid/server/filter/Expression.java b/trunk/qpid/java/broker/src/main/java/org/apache/qpid/server/filter/Expression.java
new file mode 100644
index 0000000000..f2ebe41d26
--- /dev/null
+++ b/trunk/qpid/java/broker/src/main/java/org/apache/qpid/server/filter/Expression.java
@@ -0,0 +1,38 @@
+/**
+ *
+ * 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.filter;
+//
+// Based on like named file from r450141 of the Apache ActiveMQ project <http://www.activemq.org/site/home.html>
+//
+
+import org.apache.qpid.AMQException;
+import org.apache.qpid.server.queue.AMQMessage;
+import org.apache.qpid.server.queue.Filterable;
+
+/**
+ * Represents an expression
+ */
+public interface Expression<E extends Exception>
+{
+
+    /**
+     * @return the value of this expression
+     */
+    public Object evaluate(Filterable<E> message) throws E;
+
+}