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.Processor;
020    import org.apache.camel.model.ProcessorDefinition;
021    import org.apache.camel.spi.InterceptStrategy;
022    import org.apache.camel.spi.RouteContext;
023    
024    /**
025     * {@link InterceptStrategy} implementation to configure stream caching on a RouteContext
026     */
027    public final class StreamCaching implements InterceptStrategy {
028        
029        /*
030         * Hide constructor -- instances will be created through static enable() methods
031         */
032        private StreamCaching() {
033            super();
034        }
035    
036        @SuppressWarnings("unchecked")
037        public Processor wrapProcessorInInterceptors(ProcessorDefinition processorType, Processor target) throws Exception {
038            return new StreamCachingInterceptor(target);
039        }
040        
041        /**
042         * Enable stream caching for a RouteContext
043         * 
044         * @param context the route context
045         */
046        public static void enable(RouteContext context) {
047            for (InterceptStrategy strategy : context.getInterceptStrategies()) {
048                if (strategy instanceof StreamCaching) {
049                    return;
050                }
051            }
052            context.addInterceptStrategy(new StreamCaching());
053        }
054        
055        /**
056         * Disable stream caching for a RouteContext
057         * 
058         * @param context the route context
059         */
060        public static void disable(RouteContext context) {
061            for (InterceptStrategy strategy : context.getInterceptStrategies()) {
062                if (strategy instanceof StreamCaching) {
063                    context.getInterceptStrategies().remove(strategy);
064                    return;
065                }
066            }        
067        }
068    }