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 */
017package org.apache.camel.model.language;
018
019import javax.xml.bind.annotation.XmlAccessType;
020import javax.xml.bind.annotation.XmlAccessorType;
021import javax.xml.bind.annotation.XmlAttribute;
022import javax.xml.bind.annotation.XmlRootElement;
023import javax.xml.bind.annotation.XmlTransient;
024
025import org.apache.camel.CamelContext;
026import org.apache.camel.Expression;
027import org.apache.camel.Predicate;
028import org.apache.camel.RuntimeCamelException;
029import org.apache.camel.builder.SimpleBuilder;
030import org.apache.camel.spi.Metadata;
031
032/**
033 * To use Camels built-in Simple language in Camel expressions or predicates.
034 */
035@Metadata(firstVersion = "1.1.0", label = "language,core,java", title = "Simple")
036@XmlRootElement(name = "simple")
037@XmlAccessorType(XmlAccessType.FIELD)
038public class SimpleExpression extends ExpressionDefinition {
039    @XmlAttribute(name = "resultType")
040    private String resultTypeName;
041    @XmlTransient
042    private Class<?> resultType;
043
044    public SimpleExpression() {
045    }
046
047    public SimpleExpression(String expression) {
048        super(expression);
049    }
050
051    public SimpleExpression(Expression expression) {
052        super(expression);
053    }
054
055    @Override
056    public String getLanguage() {
057        return "simple";
058    }
059
060    public Class<?> getResultType() {
061        return resultType;
062    }
063
064    /**
065     * Sets the class of the result type (type from output)
066     */
067    public void setResultType(Class<?> resultType) {
068        this.resultType = resultType;
069    }
070
071    public String getResultTypeName() {
072        return resultTypeName;
073    }
074
075    /**
076     * Sets the class name of the result type (type from output)
077     */
078    public void setResultTypeName(String resultTypeName) {
079        this.resultTypeName = resultTypeName;
080    }
081
082    @Override
083    public Expression createExpression(CamelContext camelContext) {
084        if (resultType == null && resultTypeName != null) {
085            try {
086                resultType = camelContext.getClassResolver().resolveMandatoryClass(resultTypeName);
087            } catch (ClassNotFoundException e) {
088                throw RuntimeCamelException.wrapRuntimeCamelException(e);
089            }
090        }
091
092        String exp = getExpression();
093        // should be true by default
094        boolean isTrim = getTrim() == null || getTrim();
095        if (exp != null && isTrim) {
096            exp = exp.trim();
097        }
098
099        SimpleBuilder answer = new SimpleBuilder(exp);
100        answer.setResultType(resultType);
101        return answer;
102    }
103
104    @Override
105    public Predicate createPredicate(CamelContext camelContext) {
106        // SimpleBuilder is also a Predicate
107        return (Predicate)createExpression(camelContext);
108    }
109}