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        // create a new exchange to use during validation to avoid side-effects on original exchange
059        DefaultExchange validateExchange = new DefaultExchange(exchange);
060        validateExchange.setIn(message);
061        validateExchange.setProperties(exchange.getProperties());
062        try {
063            processor.process(validateExchange);
064
065            // if the validation failed then propagate the exception
066            if (validateExchange.getException() != null) {
067                exchange.setException(validateExchange.getException());
068            }
069
070        } catch (Exception e) {
071            if (e instanceof ValidationException) {
072                throw (ValidationException)e;
073            } else {
074                throw new ValidationException(String.format("Validation failed for '%s'", type), exchange, e);
075            }
076        }
077    }
078
079    /**
080     * Set processor to use
081     *
082     * @param processor Processor
083     * @return this ProcessorTransformer instance
084     */
085    public ProcessorValidator setProcessor(Processor processor) {
086        this.processor = processor;
087        this.validatorString = null;
088        return this;
089    }
090
091    @Override
092    public String toString() {
093        if (validatorString == null) {
094            validatorString =
095                String.format("ProcessorValidator[type='%s', processor='%s']", getType(), processor);
096        }
097        return validatorString;
098    }
099
100    @Override
101    protected void doStart() throws Exception {
102        ObjectHelper.notNull(processor, "processor", this);
103        ServiceHelper.startService(this.processor);
104    }
105
106    @Override
107    protected void doStop() throws Exception {
108        ServiceHelper.stopService(this.processor);
109    }
110}