/*
* Copyright 2002-2016 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.codec.xml;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import javax.xml.bind.JAXBException;
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.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 an {@code Object} stream to a byte stream of XML elements.
*
* @author Sebastien Deleuze
* @author Arjen Poutsma
* @see Jaxb2Decoder
*/
public class Jaxb2Encoder extends AbstractSingleValueEncoder<Object> {
private final JaxbContextContainer jaxbContexts = new JaxbContextContainer();
public Jaxb2Encoder() {
super(MimeTypeUtils.APPLICATION_XML, MimeTypeUtils.TEXT_XML);
}
@Override
public boolean canEncode(ResolvableType elementType, MimeType mimeType, Object... hints) {
if (super.canEncode(elementType, mimeType, hints)) {
Class<?> outputClass = elementType.getRawClass();
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, Object... hints) {
try {
DataBuffer buffer = dataBufferFactory.allocateBuffer(1024);
OutputStream outputStream = buffer.asOutputStream();
Class<?> clazz = ClassUtils.getUserClass(value);
Marshaller marshaller = jaxbContexts.createMarshaller(clazz);
marshaller
.setProperty(Marshaller.JAXB_ENCODING, StandardCharsets.UTF_8.name());
marshaller.marshal(value, outputStream);
return Flux.just(buffer);
}
catch (JAXBException ex) {
return Flux.error(ex);
}
}
}