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.model;
018    
019    import javax.xml.bind.annotation.XmlAccessType;
020    import javax.xml.bind.annotation.XmlAccessorType;
021    import javax.xml.bind.annotation.XmlRootElement;
022    
023    import org.apache.camel.Expression;
024    import org.apache.camel.Processor;
025    import org.apache.camel.builder.ExpressionBuilder;
026    import org.apache.camel.model.language.ExpressionDefinition;
027    import org.apache.camel.processor.Delayer;
028    import org.apache.camel.spi.RouteContext;
029    import org.apache.camel.util.ObjectHelper;
030    
031    /**
032     * Represents an XML <delay/> element
033     *
034     * @version $Revision: 781713 $
035     */
036    @XmlRootElement(name = "delay")
037    @XmlAccessorType(XmlAccessType.FIELD)
038    public class DelayDefinition extends ExpressionNode {
039    
040        public DelayDefinition() {
041        }
042    
043        public DelayDefinition(Expression delay) {
044            super(delay);
045        }
046    
047        @Override
048        public String getLabel() {
049            return "delay";
050        }
051    
052        @Override
053        public String getShortName() {
054            return "delay";
055        }
056    
057        @Override
058        public String toString() {
059            return "Delay[" + getExpression() + " -> " + getOutputs() + "]";
060        }
061    
062        // Fluent API
063        // -------------------------------------------------------------------------
064    
065        /**
066         * Sets the delay time in millis to delay
067         *
068         * @param delay delay time in millis
069         * @return the builder
070         */
071        public DelayDefinition delayTime(Long delay) {
072            setExpression(new ExpressionDefinition(ExpressionBuilder.constantExpression(delay)));
073            return this;
074        }
075        
076        @Override
077        public Processor createProcessor(RouteContext routeContext) throws Exception {
078            Processor childProcessor = routeContext.createProcessor(this);
079            Expression delay = createAbsoluteTimeDelayExpression(routeContext);
080            return new Delayer(childProcessor, delay);
081        }
082    
083        private Expression createAbsoluteTimeDelayExpression(RouteContext routeContext) {
084            ExpressionDefinition expr = getExpression();
085            if (expr != null) {
086                if (ObjectHelper.isNotEmpty(expr.getExpression()) || expr.getExpressionValue() != null) {
087                    return expr.createExpression(routeContext);
088                } 
089            } 
090            return null;
091        }
092    }