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 java.util.ArrayList;
020    import java.util.List;
021    
022    import javax.xml.bind.annotation.XmlAccessType;
023    import javax.xml.bind.annotation.XmlAccessorType;
024    import javax.xml.bind.annotation.XmlElementRef;
025    
026    import org.apache.camel.Expression;
027    import org.apache.camel.Predicate;
028    import org.apache.camel.Processor;
029    import org.apache.camel.model.language.ExpressionType;
030    import org.apache.camel.processor.FilterProcessor;
031    import org.apache.camel.spi.RouteContext;
032    
033    /**
034     * A base class for nodes which contain an expression and a number of outputs
035     *
036     * @version $Revision: 43540 $
037     */
038    @XmlAccessorType(XmlAccessType.FIELD)
039    public class ExpressionNode extends ProcessorType<ProcessorType> {
040        @XmlElementRef
041        private ExpressionType expression;
042        @XmlElementRef
043        private List<ProcessorType<?>> outputs = new ArrayList<ProcessorType<?>>();
044    
045        public ExpressionNode() {
046        }
047    
048        public ExpressionNode(ExpressionType expression) {
049            this.expression = expression;
050        }
051    
052        public ExpressionNode(Expression expression) {
053            if (expression != null) {
054                setExpression(new ExpressionType(expression));
055            }
056        }
057    
058        public ExpressionNode(Predicate predicate) {
059            if (predicate != null) {
060                setExpression(new ExpressionType(predicate));
061            }
062        }
063    
064        @Override
065        public String getShortName() {
066            return "exp";
067        }
068          
069        public ExpressionType getExpression() {
070            return expression;
071        }
072    
073        public void setExpression(ExpressionType expression) {
074            this.expression = expression;
075        }
076    
077        public List<ProcessorType<?>> getOutputs() {
078            return outputs;
079        }
080    
081        public void setOutputs(List<ProcessorType<?>> outputs) {
082            this.outputs = outputs;
083        }
084    
085        @Override
086        public String getLabel() {
087            if (getExpression() == null) {
088                return "";
089            }
090            return getExpression().getLabel();
091        }
092    
093        protected FilterProcessor createFilterProcessor(RouteContext routeContext) throws Exception {
094            Processor childProcessor = routeContext.createProcessor(this);
095            return new FilterProcessor(getExpression().createPredicate(routeContext), childProcessor);
096        }
097    
098        @Override
099        protected void configureChild(ProcessorType output) {
100            super.configureChild(output);
101            if (isInheritErrorHandler()) {
102                output.setErrorHandlerBuilder(getErrorHandlerBuilder());
103            }
104        }
105    }