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; 018 019import javax.xml.bind.annotation.XmlAccessType; 020import javax.xml.bind.annotation.XmlAccessorType; 021import javax.xml.bind.annotation.XmlRootElement; 022 023import org.apache.camel.Predicate; 024import org.apache.camel.model.language.ExpressionDefinition; 025import org.apache.camel.processor.validation.PredicateValidatingProcessor; 026import org.apache.camel.spi.Metadata; 027import org.apache.camel.spi.RouteContext; 028 029/** 030 * Validates a message based on an expression 031 * 032 * @version 033 */ 034@Metadata(label = "eip,transformation") 035@XmlRootElement(name = "validate") 036@XmlAccessorType(XmlAccessType.FIELD) 037public class ValidateDefinition extends NoOutputExpressionNode { 038 039 public ValidateDefinition() { 040 } 041 042 @Override 043 public String toString() { 044 return "Validate[" + getExpression() + " -> " + getOutputs() + "]"; 045 } 046 047 @Override 048 public String getLabel() { 049 return "validate[" + getExpression() + "]"; 050 } 051 052 @Override 053 public PredicateValidatingProcessor createProcessor(RouteContext routeContext) throws Exception { 054 Predicate pred = getExpression().createPredicate(routeContext); 055 return new PredicateValidatingProcessor(pred); 056 } 057 058 /** 059 * Expression to use for validation as a predicate. The expression should return either <tt>true</tt> or <tt>false</tt>. 060 * If returning <tt>false</tt> the message is invalid and an exception is thrown. 061 */ 062 @Override 063 public void setExpression(ExpressionDefinition expression) { 064 // override to include javadoc what the expression is used for 065 super.setExpression(expression); 066 } 067 068 069}