001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.processor.interceptor;
018    
019    import org.apache.camel.AsyncCallback;
020    import org.apache.camel.Exchange;
021    import org.apache.camel.Processor;
022    import org.apache.camel.StreamCache;
023    import org.apache.camel.processor.DelegateAsyncProcessor;
024    import org.apache.camel.util.MessageHelper;
025    
026    /**
027     * An interceptor that converts streams messages into a re-readable format
028     * by wrapping the stream into a {@link StreamCache}.
029     */
030    public class StreamCachingInterceptor extends DelegateAsyncProcessor {
031    
032        public StreamCachingInterceptor() {
033        }
034    
035        public StreamCachingInterceptor(Processor processor) {
036            super(processor);
037        }
038    
039        @Override
040        public String toString() {
041            return "StreamCachingInterceptor[" + processor + "]";
042        }
043    
044        @Override
045        public boolean process(Exchange exchange, AsyncCallback callback) {
046            StreamCache newBody = exchange.getIn().getBody(StreamCache.class);
047            if (newBody != null) {
048                exchange.getIn().setBody(newBody);
049            }
050            MessageHelper.resetStreamCache(exchange.getIn());
051    
052            return getProcessor().process(exchange, callback);
053        }
054    
055    }