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.impl.validator;
018
019import org.apache.camel.CamelContext;
020import org.apache.camel.Exchange;
021import org.apache.camel.Message;
022import org.apache.camel.Processor;
023import org.apache.camel.ValidationException;
024import org.apache.camel.impl.DefaultExchange;
025import org.apache.camel.spi.DataType;
026import org.apache.camel.spi.Validator;
027import org.apache.camel.util.ObjectHelper;
028import org.apache.camel.util.ServiceHelper;
029import org.slf4j.Logger;
030import org.slf4j.LoggerFactory;
031
032/**
033 * A {@link Validator} implementation which leverages {@link Processor} to perform validation.
034 * 
035 * {@see Validator}
036 */
037public class ProcessorValidator extends Validator {
038    private static final Logger LOG = LoggerFactory.getLogger(ProcessorValidator.class);
039
040    private Processor processor;
041    private String validatorString;
042
043    public ProcessorValidator(CamelContext context) {
044        setCamelContext(context);
045    }
046
047    /**
048     * Perform content validation with specified type using Processor.
049     *
050     * @param message message to apply validation
051     * @param type 'from' data type
052     */
053    @Override
054    public void validate(Message message, DataType type) throws ValidationException {
055        Exchange exchange = message.getExchange();
056        
057        LOG.debug("Sending to validate processor '{}'", processor);
058        DefaultExchange validateExchange = new DefaultExchange(exchange);
059        validateExchange.setIn(message);
060        validateExchange.setProperties(exchange.getProperties());
061        try {
062            processor.process(validateExchange);
063        } catch (Exception e) {
064            if (e instanceof ValidationException) {
065                throw (ValidationException)e;
066            } else {
067                throw new ValidationException(String.format("Validation failed for '%s'", type), validateExchange, e);
068            }
069        }
070    }
071
072    /**
073     * Set processor to use
074     *
075     * @param processor Processor
076     * @return this ProcessorTransformer instance
077     */
078    public ProcessorValidator setProcessor(Processor processor) {
079        this.processor = processor;
080        this.validatorString = null;
081        return this;
082    }
083
084    @Override
085    public String toString() {
086        if (validatorString == null) {
087            validatorString =
088                String.format("ProcessorValidator[type='%s', processor='%s']", getType(), processor);
089        }
090        return validatorString;
091    }
092
093    @Override
094    protected void doStart() throws Exception {
095        ObjectHelper.notNull(processor, "processor", this);
096        ServiceHelper.startService(this.processor);
097    }
098
099    @Override
100    protected void doStop() throws Exception {
101        ServiceHelper.stopService(this.processor);
102    }
103}