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.language;
018    
019    import javax.xml.bind.annotation.XmlAccessType;
020    import javax.xml.bind.annotation.XmlAccessorType;
021    import javax.xml.bind.annotation.XmlAttribute;
022    import javax.xml.bind.annotation.XmlRootElement;
023    import javax.xml.bind.annotation.XmlTransient;
024    
025    import org.apache.camel.CamelContext;
026    import org.apache.camel.Expression;
027    import org.apache.camel.Predicate;
028    import org.apache.camel.builder.SimpleBuilder;
029    import org.apache.camel.util.ObjectHelper;
030    
031    /**
032     * For expressions and predicates using the
033     * <a href="http://camel.apache.org/simple.html">simple language</a>
034     *
035     * @version 
036     */
037    @XmlRootElement(name = "simple")
038    @XmlAccessorType(XmlAccessType.FIELD)
039    public class SimpleExpression extends ExpressionDefinition {
040        @XmlAttribute(name = "resultType")
041        private String resultTypeName;
042        @XmlTransient
043        private Class<?> resultType;
044    
045        public SimpleExpression() {
046        }
047    
048        public SimpleExpression(String expression) {
049            super(expression);
050        }
051    
052        public SimpleExpression(Expression expression) {
053            super(expression);
054        }
055    
056        public String getLanguage() {
057            return "simple";
058        }
059    
060        public Class<?> getResultType() {
061            return resultType;
062        }
063    
064        public void setResultType(Class<?> resultType) {
065            this.resultType = resultType;
066        }
067    
068        public String getResultTypeName() {
069            return resultTypeName;
070        }
071    
072        public void setResultTypeName(String resultTypeName) {
073            this.resultTypeName = resultTypeName;
074        }
075    
076        @Override
077        public Expression createExpression(CamelContext camelContext) {
078            if (resultType == null && resultTypeName != null) {
079                try {
080                    resultType = camelContext.getClassResolver().resolveMandatoryClass(resultTypeName);
081                } catch (ClassNotFoundException e) {
082                    throw ObjectHelper.wrapRuntimeCamelException(e);
083                }
084            }
085    
086            String exp = getExpression();
087            if (isTrim() && exp != null) {
088                exp = exp.trim();
089            }
090    
091            SimpleBuilder answer = new SimpleBuilder(exp);
092            answer.setResultType(resultType);
093            return answer;
094        }
095    
096        @Override
097        public Predicate createPredicate(CamelContext camelContext) {
098            // SimpleBuilder is also a Predicate
099            return (Predicate) createExpression(camelContext);
100        }
101    }