| /* |
| * 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.cometd.bayeux; |
| |
| /** |
| * Data Filter<br> |
| * Data filters are used to transform data as it is sent to a Channel. |
| * Messages are filtered as the message is published to a channel, invoking the |
| * {@link Channel#publish(Message)} method.<br> |
| * This method gets invoked in two different scenarios, the first being when a message is received from |
| * a remote client, and the Bayeux implementation invokes the publish method directly. |
| * The second scenario is when a local client invokes {@link Channel#publish(Message)} directly in the local JVM. |
| * @author Greg Wilkins |
| * |
| */ |
| public interface DataFilter |
| { |
| /** |
| * Runs a message through the filter. Filtering can only modify an existing object, it can not replace it. |
| * @param data Message - the message to be filtered, may not be null |
| */ |
| public void filter(Message data); |
| } |