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The Core Camel Java DSL based router
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/**
 * 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.camel.impl;

import org.apache.camel.DelegateProcessor;
import org.apache.camel.Exchange;
import org.apache.camel.Expression;
import org.apache.camel.Processor;
import org.apache.camel.RouteNode;
import org.apache.camel.Traceable;
import org.apache.camel.model.ProcessorDefinition;

/**
 * A default implementation of the {@link org.apache.camel.RouteNode}
 *
 * @version 
 */
public class DefaultRouteNode implements RouteNode {

    private Expression expression;
    private Processor processor;
    private ProcessorDefinition processorDefinition;

    public DefaultRouteNode(ProcessorDefinition processorDefinition, Processor processor) {
        this.processor = processor;
        this.processorDefinition = processorDefinition;
    }

    public DefaultRouteNode(ProcessorDefinition processorDefinition, Expression expression) {
        this.processorDefinition = processorDefinition;
        this.expression = expression;
    }

    public Processor getProcessor() {
        return processor;
    }

    public ProcessorDefinition getProcessorDefinition() {
        return processorDefinition;
    }

    public String getLabel(Exchange exchange) {
        if (expression != null) {
            return expression.evaluate(exchange, String.class);
        }

        String label = getTraceLabel(processor);
        if (label == null) {
            // no label then default to use the definition label
            label = processorDefinition.getLabel();
        }
        return label;
    }

    @SuppressWarnings("deprecation")
    private String getTraceLabel(Processor target) {
        if (target == null) {
            return null;
        }

        if (target instanceof Traceable) {
            Traceable trace = (Traceable) target;
            return trace.getTraceLabel();
        } else if (target instanceof org.apache.camel.processor.Traceable) {
            // to be backwards compatible
            org.apache.camel.processor.Traceable trace = (org.apache.camel.processor.Traceable) target;
            return trace.getTraceLabel();
        }

        // if we are a delegate then drill down
        if (target instanceof DelegateProcessor) {
            return getTraceLabel(((DelegateProcessor) target).getProcessor());
        }

        return null;
    }

    public boolean isAbstract() {
        return processor == null;
    }

    @Override
    public String toString() {
        return "RouteNode[" + processorDefinition + "]";
    }
}