kikaha.urouting.serializers.jaxb.JAXBSerializer Maven / Gradle / Ivy

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package kikaha.urouting.serializers.jaxb;

import java.io.OutputStream;

import javax.enterprise.inject.Typed;
import javax.inject.Singleton;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.namespace.QName;

import kikaha.urouting.api.AbstractSerializer;
import kikaha.urouting.api.ContentType;
import kikaha.urouting.api.Mimes;
import kikaha.urouting.api.RoutingException;
import kikaha.urouting.api.Serializer;

@SuppressWarnings( "unchecked" )
@ContentType(Mimes.XML)
@Singleton
@Typed( Serializer.class )
public class JAXBSerializer extends AbstractSerializer {

	@Override
	public  void serialize( final T object, final OutputStream output ) throws RoutingException {
		try {
			final Class clazz = (Class)object.getClass();
			serialize( clazz, object, output );
		} catch ( final JAXBException cause ) {
			throw new RoutingException( cause );
		}
	}

	 void serialize( final Class clazz, final T object, final OutputStream output ) throws JAXBException {
		final JAXBContext context = JAXBContext.newInstance( clazz );
		final String rootElementName = extractRootElementName( clazz );
		final JAXBElement element = new JAXBElement( new QName( rootElementName ), clazz, object );
		final Marshaller marshaller = context.createMarshaller();
		marshaller.marshal( element, output );
	}

	String extractRootElementName( final Class clazz ) {
		final XmlRootElement rootElement = clazz.getAnnotation( XmlRootElement.class );
		if ( rootElement != null && !rootElement.name().isEmpty() )
			return rootElement.name();
		return clazz.getSimpleName().toLowerCase();
	}
}