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Spring Object/XML Mapping abstraction
/*
* Copyright 2006 the original author or authors.
*
* 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.springframework.oxm.jaxb;
import java.util.Iterator;
import java.util.Map;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.ValidationEventHandler;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.oxm.XmlMappingException;
/**
* Abstract base class for implementations of the Marshaller and Unmarshaller interfaces that
* use JAXB. This base class is responsible for creating JAXB marshallers from a JAXBContext.
*
* JAXB 2.0 added breaking API changes, so specific subclasses must be used for JAXB 1.0 and 2.0
* (Jaxb1Marshaller and Jaxb2Marshaller respectivaly).
*
* @author Arjen Poutsma
* @see Jaxb1Marshaller
* @see Jaxb2Marshaller
*/
public abstract class AbstractJaxbMarshaller
implements org.springframework.oxm.Marshaller, org.springframework.oxm.Unmarshaller, InitializingBean {
/**
* Logger available to subclasses.
*/
protected final Log logger = LogFactory.getLog(getClass());
private String contextPath;
private Map marshallerProperties;
private Map unmarshallerProperties;
private JAXBContext jaxbContext;
private ValidationEventHandler validationEventHandler;
/**
* Returns the JAXB Context path.
*/
protected String getContextPath() {
return contextPath;
}
/**
* Sets the JAXB Context path.
*/
public void setContextPath(String contextPath) {
this.contextPath = contextPath;
}
/**
* Sets the JAXB Marshaller properties. These properties will be set on the underlying JAXB
* Marshaller, and allow for features such as indentation.
*
* @param properties the properties
* @see javax.xml.bind.Marshaller#setProperty(String, Object)
* @see javax.xml.bind.Marshaller#JAXB_ENCODING
* @see javax.xml.bind.Marshaller#JAXB_FORMATTED_OUTPUT
* @see javax.xml.bind.Marshaller#JAXB_NO_NAMESPACE_SCHEMA_LOCATION
* @see javax.xml.bind.Marshaller#JAXB_SCHEMA_LOCATION
*/
public void setMarshallerProperties(Map properties) {
this.marshallerProperties = properties;
}
/**
* Sets the JAXB Unmarshaller properties. These properties will be set on the underlying JAXB
* Unmarshaller.
*
* @param properties the properties
* @see javax.xml.bind.Unmarshaller#setProperty(String, Object)
*/
public void setUnmarshallerProperties(Map properties) {
this.unmarshallerProperties = properties;
}
/**
* Sets the JAXB validation event handler. This event handler will be called by JAXB if any validation errors are
* encountered during calls to any of the marshal API's.
*
* @param validationEventHandler the event handler
*/
public void setValidationEventHandler(ValidationEventHandler validationEventHandler) {
this.validationEventHandler = validationEventHandler;
}
public final void afterPropertiesSet() throws Exception {
try {
jaxbContext = createJaxbContext();
}
catch (JAXBException ex) {
throw convertJaxbException(ex);
}
}
/**
* Convert the given JAXBException to an appropriate exception from the
* org.springframework.oxm hierarchy.
*
* The default implementation delegates to JaxbUtils. Can be overridden in subclasses.
*
* @param ex JAXBException that occured
* @return the corresponding XmlMappingException instance
* @see JaxbUtils#convertJaxbException
*/
protected XmlMappingException convertJaxbException(JAXBException ex) {
return JaxbUtils.convertJaxbException(ex);
}
/**
* Returns a newly created JAXB marshaller. JAXB marshallers are not necessarily thread safe.
*/
protected Marshaller createMarshaller() {
try {
Marshaller marshaller = jaxbContext.createMarshaller();
if (marshallerProperties != null) {
for (Iterator iterator = marshallerProperties.keySet().iterator(); iterator.hasNext();) {
String name = (String) iterator.next();
marshaller.setProperty(name, marshallerProperties.get(name));
}
}
if (validationEventHandler != null) {
marshaller.setEventHandler(validationEventHandler);
}
initJaxbMarshaller(marshaller);
return marshaller;
}
catch (JAXBException ex) {
throw convertJaxbException(ex);
}
}
/**
* Returns a newly created JAXB unmarshaller. JAXB unmarshallers are not necessarily thread safe.
*/
protected Unmarshaller createUnmarshaller() {
try {
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
if (unmarshallerProperties != null) {
for (Iterator iterator = unmarshallerProperties.keySet().iterator(); iterator.hasNext();) {
String name = (String) iterator.next();
unmarshaller.setProperty(name, unmarshallerProperties.get(name));
}
}
if (validationEventHandler != null) {
unmarshaller.setEventHandler(validationEventHandler);
}
initJaxbUnmarshaller(unmarshaller);
return unmarshaller;
}
catch (JAXBException ex) {
throw convertJaxbException(ex);
}
}
/**
* Template method that can be overridden by concrete JAXB marshallers for custom initialization behavior. Gets
* called after creation of JAXB Marshaller, and after the respective properties have been set.
*
* Default implementation does nothing.
*/
protected void initJaxbMarshaller(Marshaller marshaller) throws JAXBException {
}
/**
* Template method that can overridden by concrete JAXB marshallers for custom initialization behavior. Gets called
* after creation of JAXB Unmarshaller, and after the respective properties have been set.
*
* Default implementation does nothing.
*/
protected void initJaxbUnmarshaller(Unmarshaller unmarshaller) throws JAXBException {
}
/**
* Template method that returns a newly created JAXB context. Called from afterPropertiesSet().
*/
protected abstract JAXBContext createJaxbContext() throws Exception;
}