/**
*
* Copyright 2005 LogicBlaze, Inc. http://www.logicblaze.com
*
* Licensed 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.servicemix.components.validation;
import org.servicemix.components.util.TransformComponentSupport;
import org.servicemix.jbi.FaultException;
import org.servicemix.jbi.jaxp.SourceTransformer;
import org.springframework.core.io.Resource;
import org.xml.sax.SAXException;
import javax.jbi.JBIException;
import javax.jbi.messaging.Fault;
import javax.jbi.messaging.MessageExchange;
import javax.jbi.messaging.MessagingException;
import javax.jbi.messaging.NormalizedMessage;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
import java.io.IOException;
/**
* This component performs a schema validation on the incoming document
* and returning a fault if the document does not conform to the schema
* otherwise the message is passed on its way.
*
* @version $Revision: 596 $
*/
public class ValidateComponent extends TransformComponentSupport {
private Schema schema;
private String schemaLanguage = "http://www.w3.org/2001/XMLSchema";
private Source schemaSource;
private Resource schemaResource;
public Schema getSchema() {
return schema;
}
public void setSchema(Schema schema) {
this.schema = schema;
}
public String getSchemaLanguage() {
return schemaLanguage;
}
public void setSchemaLanguage(String schemaLanguage) {
this.schemaLanguage = schemaLanguage;
}
public Source getSchemaSource() {
return schemaSource;
}
public void setSchemaSource(Source schemaSource) {
this.schemaSource = schemaSource;
}
public Resource getSchemaResource() {
return schemaResource;
}
public void setSchemaResource(Resource schemaResource) {
this.schemaResource = schemaResource;
}
protected void init() throws JBIException {
super.init();
try {
if (schema == null) {
SchemaFactory factory = SchemaFactory.newInstance(schemaLanguage);
if (schemaSource == null) {
if (schemaResource == null) {
throw new JBIException("You must specify a schema, schemaSource or schemaResource property");
}
schemaSource = new StreamSource(schemaResource.getInputStream());
}
schema = factory.newSchema(schemaSource);
}
}
catch (IOException e) {
throw new JBIException("Failed to load schema: " + e, e);
}
catch (SAXException e) {
throw new JBIException("Failed to load schema: " + e, e);
}
}
protected boolean transform(MessageExchange exchange, NormalizedMessage in, NormalizedMessage out) throws MessagingException {
Validator validator = schema.newValidator();
CountingErrorHandler errorHandler = new CountingErrorHandler();
validator.setErrorHandler(errorHandler);
DOMResult result = new DOMResult();
// Transform first so that the input source will be parsed only once
// if it is a StreamSource
getMessageTransformer().transform(exchange, in, out);
try {
// Only DOMSource and SAXSource are allowed for validating
// See http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/validation/Validator.html#validate(javax.xml.transform.Source,%20javax.xml.transform.Result)
// As we expect a DOMResult as output, we must ensure that the input is a
// DOMSource
Source src = new SourceTransformer().toDOMSource(out.getContent());
validator.validate(src, result);
if (errorHandler.hasErrors()) {
Fault fault = exchange.createFault();
fault.setProperty("org.servicemix.schema", schema);
fault.setContent(new DOMSource(result.getNode(), result.getSystemId()));
throw new FaultException("Failed to validate against schema: " + schema, exchange, fault);
}
else {
// Retrieve the ouput of the validation
// as it may have been changed by the validator
out.setContent(new DOMSource(result.getNode(), result.getSystemId()));
return true;
}
}
catch (SAXException e) {
throw new MessagingException(e);
}
catch (IOException e) {
throw new MessagingException(e);
}
catch (ParserConfigurationException e) {
throw new MessagingException(e);
}
catch (TransformerException e) {
throw new MessagingException(e);
}
}
}