| /** |
| * 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.processor; |
| |
| import java.util.Iterator; |
| |
| import org.apache.camel.CamelContext; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.Expression; |
| import org.apache.camel.util.ObjectHelper; |
| |
| /** |
| * Implements a <a href="http://camel.apache.org/dynamic-router.html">Dynamic Router</a> pattern |
| * where the destination(s) is computed at runtime. |
| * <p/> |
| * This implementation builds on top of {@link org.apache.camel.processor.RoutingSlip} which contains |
| * the most logic. |
| * |
| * @version |
| */ |
| public class DynamicRouter extends RoutingSlip { |
| |
| public DynamicRouter(CamelContext camelContext) { |
| super(camelContext); |
| } |
| |
| public DynamicRouter(CamelContext camelContext, Expression expression, String uriDelimiter) { |
| super(camelContext, expression, uriDelimiter); |
| } |
| |
| @Override |
| protected RoutingSlipIterator createRoutingSlipIterator(Exchange exchange) { |
| return new DynamicRoutingSlipIterator(expression); |
| } |
| |
| /** |
| * The dynamic routing slip iterator. |
| */ |
| private final class DynamicRoutingSlipIterator implements RoutingSlipIterator { |
| |
| private final Expression slip; |
| private Iterator current; |
| |
| private DynamicRoutingSlipIterator(Expression slip) { |
| this.slip = slip; |
| } |
| |
| public boolean hasNext(Exchange exchange) { |
| if (current != null && current.hasNext()) { |
| return true; |
| } |
| // evaluate next slip |
| Object routingSlip = slip.evaluate(exchange, Object.class); |
| if (routingSlip == null) { |
| return false; |
| } |
| current = ObjectHelper.createIterator(routingSlip, uriDelimiter); |
| return current != null && current.hasNext(); |
| } |
| |
| public Object next(Exchange exchange) { |
| return current.next(); |
| } |
| } |
| } |