/*
* Copyright 2002-2010 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.http.converter.xml;
import java.io.IOException;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.MarshalException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.PropertyException;
import javax.xml.bind.UnmarshalException;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConversionException;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.http.converter.HttpMessageNotWritableException;
import org.springframework.util.ClassUtils;
/**
* Implementation of {@link org.springframework.http.converter.HttpMessageConverter HttpMessageConverter} that can read
* and write XML using JAXB2.
*
* <p>This converter can read classes annotated with {@link XmlRootElement} and {@link XmlType}, and write classes
* annotated with with {@link XmlRootElement}, or subclasses thereof.
*
* @author Arjen Poutsma
* @since 3.0
*/
public class Jaxb2RootElementHttpMessageConverter extends AbstractJaxb2HttpMessageConverter<Object> {
@Override
public boolean canRead(Class<?> clazz, MediaType mediaType) {
return (clazz.isAnnotationPresent(XmlRootElement.class) || clazz.isAnnotationPresent(XmlType.class)) &&
canRead(mediaType);
}
@Override
public boolean canWrite(Class<?> clazz, MediaType mediaType) {
return AnnotationUtils.findAnnotation(clazz, XmlRootElement.class) != null && canWrite(mediaType);
}
@Override
protected boolean supports(Class<?> clazz) {
// should not be called, since we override canRead/Write
throw new UnsupportedOperationException();
}
@Override
protected Object readFromSource(Class<?> clazz, HttpHeaders headers, Source source) throws IOException {
try {
Unmarshaller unmarshaller = createUnmarshaller(clazz);
if (clazz.isAnnotationPresent(XmlRootElement.class)) {
return unmarshaller.unmarshal(source);
}
else {
JAXBElement jaxbElement = unmarshaller.unmarshal(source, clazz);
return jaxbElement.getValue();
}
}
catch (UnmarshalException ex) {
throw new HttpMessageNotReadableException("Could not unmarshal to [" + clazz + "]: " + ex.getMessage(), ex);
}
catch (JAXBException ex) {
throw new HttpMessageConversionException("Could not instantiate JAXBContext: " + ex.getMessage(), ex);
}
}
@Override
protected void writeToResult(Object o, HttpHeaders headers, Result result) throws IOException {
try {
Class clazz = ClassUtils.getUserClass(o);
Marshaller marshaller = createMarshaller(clazz);
setCharset(headers.getContentType(), marshaller);
marshaller.marshal(o, result);
}
catch (MarshalException ex) {
throw new HttpMessageNotWritableException("Could not marshal [" + o + "]: " + ex.getMessage(), ex);
}
catch (JAXBException ex) {
throw new HttpMessageConversionException("Could not instantiate JAXBContext: " + ex.getMessage(), ex);
}
}
private void setCharset(MediaType contentType, Marshaller marshaller) throws PropertyException {
if (contentType != null && contentType.getCharSet() != null) {
marshaller.setProperty(Marshaller.JAXB_ENCODING, contentType.getCharSet().name());
}
}
}
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