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.impl;
018    
019    import org.apache.camel.DelegateProcessor;
020    import org.apache.camel.Exchange;
021    import org.apache.camel.Expression;
022    import org.apache.camel.Processor;
023    import org.apache.camel.RouteNode;
024    import org.apache.camel.Traceable;
025    import org.apache.camel.model.ProcessorDefinition;
026    
027    /**
028     * A default implementation of the {@link org.apache.camel.RouteNode}
029     *
030     * @version 
031     */
032    public class DefaultRouteNode implements RouteNode {
033    
034        private Expression expression;
035        private Processor processor;
036        private ProcessorDefinition<?> processorDefinition;
037    
038        public DefaultRouteNode(ProcessorDefinition<?> processorDefinition, Processor processor) {
039            this.processor = processor;
040            this.processorDefinition = processorDefinition;
041        }
042    
043        public DefaultRouteNode(ProcessorDefinition<?> processorDefinition, Expression expression) {
044            this.processorDefinition = processorDefinition;
045            this.expression = expression;
046        }
047    
048        public Processor getProcessor() {
049            return processor;
050        }
051    
052        public ProcessorDefinition<?> getProcessorDefinition() {
053            return processorDefinition;
054        }
055    
056        public String getLabel(Exchange exchange) {
057            if (expression != null) {
058                return expression.evaluate(exchange, String.class);
059            }
060    
061            String label = getTraceLabel(processor);
062            if (label == null) {
063                // no label then default to use the definition label
064                label = processorDefinition.getLabel();
065            }
066            return label;
067        }
068    
069        @SuppressWarnings("deprecation")
070        private String getTraceLabel(Processor target) {
071            if (target == null) {
072                return null;
073            }
074    
075            if (target instanceof Traceable) {
076                Traceable trace = (Traceable) target;
077                return trace.getTraceLabel();
078            } else if (target instanceof org.apache.camel.processor.Traceable) {
079                // to be backwards compatible
080                org.apache.camel.processor.Traceable trace = (org.apache.camel.processor.Traceable) target;
081                return trace.getTraceLabel();
082            }
083    
084            // if we are a delegate then drill down
085            if (target instanceof DelegateProcessor) {
086                return getTraceLabel(((DelegateProcessor) target).getProcessor());
087            }
088    
089            return null;
090        }
091    
092        public boolean isAbstract() {
093            return processor == null;
094        }
095    
096        @Override
097        public String toString() {
098            return "RouteNode[" + processorDefinition + "]";
099        }
100    }