RdfConverter.java

package org.molgenis.ui.converter;

import org.eclipse.rdf4j.model.Model;
import org.eclipse.rdf4j.rio.Rio;
import org.molgenis.security.core.runas.RunAsSystem;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.converter.AbstractHttpMessageConverter;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.http.converter.HttpMessageNotWritableException;
import org.springframework.stereotype.Component;

import java.io.IOException;

import static org.eclipse.rdf4j.rio.RDFFormat.TURTLE;
import static org.molgenis.ui.converter.RDFMediaType.APPLICATION_TRIG;
import static org.molgenis.ui.converter.RDFMediaType.TEXT_TURTLE;

@Component
public class RdfConverter extends AbstractHttpMessageConverter<Model>
{
	public RdfConverter()
	{
		super(TEXT_TURTLE, APPLICATION_TRIG);
	}

	@Override
	protected boolean supports(Class<?> aClass)
	{
		return Model.class.isAssignableFrom(aClass);
	}

	@Override
	protected Model readInternal(Class<? extends Model> aClass, HttpInputMessage httpInputMessage)
			throws IOException, HttpMessageNotReadableException
	{
		throw new HttpMessageNotReadableException("RDF support is readonly!");
	}

	@Override
	@RunAsSystem
	protected void writeInternal(Model model, HttpOutputMessage httpOutputMessage)
			throws IOException, HttpMessageNotWritableException
	{
		Rio.write(model, httpOutputMessage.getBody(), TURTLE);
		httpOutputMessage.getBody().close();
	}

}