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.validator;
018
019import javax.xml.bind.annotation.XmlAccessType;
020import javax.xml.bind.annotation.XmlAccessorType;
021import javax.xml.bind.annotation.XmlElementRef;
022import javax.xml.bind.annotation.XmlType;
023
024import org.apache.camel.CamelContext;
025import org.apache.camel.Expression;
026import org.apache.camel.Predicate;
027import org.apache.camel.impl.validator.ProcessorValidator;
028import org.apache.camel.model.ExpressionNodeHelper;
029import org.apache.camel.model.language.ExpressionDefinition;
030import org.apache.camel.processor.validation.PredicateValidatingProcessor;
031import org.apache.camel.spi.Metadata;
032import org.apache.camel.spi.Validator;
033
034/**
035 * Represents a predicate {@link Validator} which leverages expression or predicates to
036 * perform content validation. A {@link ProcessorValidator} will be created internally
037 * with a {@link PredicateValidatingProcessor} which validates the message according to specified expression/predicates.
038 * 
039 * {@see ValidatorDefinition}
040 * {@see Validator}
041 */
042@Metadata(label = "validation")
043@XmlType(name = "predicateValidator")
044@XmlAccessorType(XmlAccessType.FIELD)
045public class PredicateValidatorDefinition extends ValidatorDefinition {
046
047    @XmlElementRef
048    private ExpressionDefinition expression;
049
050    @Override
051    protected Validator doCreateValidator(CamelContext context) throws Exception {
052        Predicate pred = getExpression().createPredicate(context);
053        PredicateValidatingProcessor processor = new PredicateValidatingProcessor(pred);
054        return new ProcessorValidator(context)
055            .setProcessor(processor)
056            .setType(getType());
057    }
058
059    public ExpressionDefinition getExpression() {
060        return expression;
061    }
062
063    public void setExpression(ExpressionDefinition expression) {
064        // favour using the helper to set the expression as it can unwrap some unwanted builders when using Java DSL
065        if (expression instanceof Expression) {
066            this.expression = ExpressionNodeHelper.toExpressionDefinition((Expression) expression);
067        } else if (expression instanceof Predicate) {
068            this.expression = ExpressionNodeHelper.toExpressionDefinition((Predicate) expression);
069        } else {
070            this.expression = expression;
071        }
072    }
073
074}
075