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.builder;
018    
019    import java.util.List;
020    
021    import org.apache.camel.Processor;
022    import org.apache.camel.model.ExceptionType;
023    import org.apache.camel.spi.RouteContext;
024    import org.apache.camel.util.ObjectHelper;
025    
026    /**
027     * Represents a proxy to an error handler builder which is resolved by named reference
028     *
029     * @version $Revision: 43862 $
030     */
031    public class ErrorHandlerBuilderRef extends ErrorHandlerBuilderSupport {
032        private final String ref;
033        private ErrorHandlerBuilder handler;
034    
035        public ErrorHandlerBuilderRef(String ref) {
036            this.ref = ref;
037        }
038    
039        public ErrorHandlerBuilder copy() {
040            return new ErrorHandlerBuilderRef(ref);
041        }
042    
043        @Override
044        public void addErrorHandlers(ExceptionType exception) {
045            if (handler != null) {
046                handler.addErrorHandlers(exception);
047            }
048            super.addErrorHandlers(exception);
049        }
050    
051        public Processor createErrorHandler(RouteContext routeContext, Processor processor) throws Exception {
052            if (handler == null) {
053                handler = routeContext.lookup(ref, ErrorHandlerBuilder.class);
054                ObjectHelper.notNull(handler, "error handler '" + ref + "'");
055                List<ExceptionType> list = getExceptions();
056                for (ExceptionType exceptionType : list) {
057                    handler.addErrorHandlers(exceptionType);
058                }
059            }
060            return handler.createErrorHandler(routeContext, processor);
061        }
062    }