/*
* Copyright 2002-2017 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.H
*/
package org.springframework.http.codec.xml;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.util.Map;
import javax.xml.bind.JAXBException;
import javax.xml.bind.MarshalException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
import reactor.core.publisher.Flux;
import org.springframework.core.ResolvableType;
import org.springframework.core.codec.AbstractSingleValueEncoder;
import org.springframework.core.codec.CodecException;
import org.springframework.core.codec.EncodingException;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.util.ClassUtils;
import org.springframework.util.MimeType;
import org.springframework.util.MimeTypeUtils;
/**
* Encode from {@code Object} stream to a byte stream containing XML elements.
*
* @author Sebastien Deleuze
* @author Arjen Poutsma
* @since 5.0
* @see Jaxb2XmlDecoder
*/
public class Jaxb2XmlEncoder extends AbstractSingleValueEncoder<Object> {
private final JaxbContextContainer jaxbContexts = new JaxbContextContainer();
public Jaxb2XmlEncoder() {
super(MimeTypeUtils.APPLICATION_XML, MimeTypeUtils.TEXT_XML);
}
@Override
public boolean canEncode(ResolvableType elementType, MimeType mimeType) {
if (super.canEncode(elementType, mimeType)) {
Class<?> outputClass = elementType.resolve(Object.class);
return (outputClass.isAnnotationPresent(XmlRootElement.class) ||
outputClass.isAnnotationPresent(XmlType.class));
}
else {
return false;
}
}
@Override
protected Flux<DataBuffer> encode(Object value, DataBufferFactory dataBufferFactory,
ResolvableType type, MimeType mimeType, Map<String, Object> hints) {
try {
DataBuffer buffer = dataBufferFactory.allocateBuffer(1024);
OutputStream outputStream = buffer.asOutputStream();
Class<?> clazz = ClassUtils.getUserClass(value);
Marshaller marshaller = this.jaxbContexts.createMarshaller(clazz);
marshaller.setProperty(Marshaller.JAXB_ENCODING, StandardCharsets.UTF_8.name());
marshaller.marshal(value, outputStream);
return Flux.just(buffer);
}
catch (MarshalException ex) {
return Flux.error(new EncodingException("Could not marshal " + value.getClass() + " to XML", ex));
}
catch (JAXBException ex) {
return Flux.error(new CodecException("Invalid JAXB configuration", ex));
}
}
}