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: 41724 $
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        public ExpressionType getExpression() {
065            return expression;
066        }
067    
068        public void setExpression(ExpressionType expression) {
069            this.expression = expression;
070        }
071    
072        public List<ProcessorType<?>> getOutputs() {
073            return outputs;
074        }
075    
076        public void setOutputs(List<ProcessorType<?>> outputs) {
077            this.outputs = outputs;
078        }
079    
080        @Override
081        public String getLabel() {
082            if (getExpression() == null) {
083                return "";
084            }
085            return getExpression().getLabel();
086        }
087    
088        protected FilterProcessor createFilterProcessor(RouteContext routeContext) throws Exception {
089            Processor childProcessor = routeContext.createProcessor(this);
090            return new FilterProcessor(getExpression().createPredicate(routeContext), childProcessor);
091        }
092    
093        @Override
094        protected void configureChild(ProcessorType output) {
095            super.configureChild(output);
096            if (isInheritErrorHandler()) {
097                output.setErrorHandlerBuilder(getErrorHandlerBuilder());
098            }
099        }
100    }