components/camel-jing/src/main/java/org/apache/camel/component/validator/jing/JingValidator.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.camel.component.validator.jing;

import javax.xml.transform.Source;
import javax.xml.transform.sax.SAXSource;

import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

import com.thaiopensource.util.PropertyMap;
import com.thaiopensource.util.PropertyMapBuilder;
import com.thaiopensource.validate.Schema;
import com.thaiopensource.validate.ValidateProperty;
import com.thaiopensource.validate.Validator;
import com.thaiopensource.xml.sax.Jaxp11XMLReaderCreator;
import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.impl.DefaultProducer;
import org.apache.camel.processor.validation.DefaultValidationErrorHandler;
import org.apache.camel.util.ExchangeHelper;

/**
 * A validator which uses the <a
 * href="http://www.thaiopensource.com/relaxng/jing.html">Jing</a> library to
 * validate XML against RelaxNG
 * 
 * @version 
 */
public class JingValidator extends DefaultProducer {
    private Schema schema;

    public JingValidator(Endpoint endpoint) {
        super(endpoint);
    }

    public void process(Exchange exchange) throws Exception {
        Jaxp11XMLReaderCreator xmlCreator = new Jaxp11XMLReaderCreator();
        DefaultValidationErrorHandler errorHandler = new DefaultValidationErrorHandler();

        PropertyMapBuilder mapBuilder = new PropertyMapBuilder();
        mapBuilder.put(ValidateProperty.XML_READER_CREATOR, xmlCreator);
        mapBuilder.put(ValidateProperty.ERROR_HANDLER, errorHandler);
        PropertyMap propertyMap = mapBuilder.toPropertyMap();

        Validator validator = getSchema().createValidator(propertyMap);

        Message in = exchange.getIn();
        SAXSource saxSource = in.getBody(SAXSource.class);
        if (saxSource == null) {
            Source source = exchange.getIn().getMandatoryBody(Source.class);
            saxSource = ExchangeHelper.convertToMandatoryType(exchange, SAXSource.class, source);
        }
        InputSource bodyInput = saxSource.getInputSource();

        // now lets parse the body using the validator
        XMLReader reader = xmlCreator.createXMLReader();
        reader.setContentHandler(validator.getContentHandler());
        reader.setDTDHandler(validator.getDTDHandler());
        reader.setErrorHandler(errorHandler);
        reader.parse(bodyInput);

        errorHandler.handleErrors(exchange, schema);
    }

    // Properties
    // -------------------------------------------------------------------------


    public Schema getSchema() {
        return schema;
    }

    public void setSchema(Schema schema) {
        this.schema = schema;
    }
}