1 files changed, 35 insertions, 0 deletions
diff --git a/qpid/java/client/src/main/java/org/apache/qpid/filter/Expression.java b/qpid/java/client/src/main/java/org/apache/qpid/filter/Expression.java
new file mode 100644
index 0000000000..8208f49688
--- /dev/null
+++ b/qpid/java/client/src/main/java/org/apache/qpid/filter/Expression.java
@@ -0,0 +1,35 @@
+/* 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.filter;
+
+import org.apache.qpid.AMQInternalException;
+import org.apache.qpid.client.message.AbstractJMSMessage;
+
+
+/**
+ * Represents an expression
+ */
+public interface Expression
+{
+    /**
+     * @param message The message to evaluate
+     * @return the value of this expression
+     * @throws AMQInternalException 
+     */
+    public Object evaluate(AbstractJMSMessage message) throws AMQInternalException;
+}