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Ontology-driven Linked Data processor and server for SPARQL backends

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/*
 * Copyright 2017 Martynas Jusevičius .
 *
 * 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 com.atomgraph.server.mapper;

import com.atomgraph.server.exception.ConstraintViolationException;
import javax.ws.rs.core.Response;
import javax.ws.rs.ext.ExceptionMapper;
import org.apache.jena.query.DatasetFactory;
import org.apache.jena.rdf.model.ResIterator;
import org.apache.jena.rdf.model.Resource;
import org.apache.jena.rdf.model.ResourceFactory;
import org.apache.jena.vocabulary.RDF;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.spinrdf.constraints.SPINConstraints;
import org.spinrdf.vocabulary.SPIN;

/**
 *
 * @author Martynas Jusevičius {@literal }
 */
public class ConstraintViolationExceptionMapper extends ExceptionMapperBase implements ExceptionMapper
{

    private static final Logger log = LoggerFactory.getLogger(ConstraintViolationExceptionMapper.class);
        
    @Override
    public Response toResponse(ConstraintViolationException ex)
    {
        Resource exception = toResource(ex, Response.Status.BAD_REQUEST,
            ResourceFactory.createResource("http://www.w3.org/2011/http-statusCodes#BadRequest"));
        ex.getModel().add(exception.getModel());
        
        SPINConstraints.addConstraintViolationsRDF(ex.getConstraintViolations(), ex.getModel(), true);
        ResIterator it = ex.getModel().listSubjectsWithProperty(RDF.type, SPIN.ConstraintViolation);
        try
        {
            while (it.hasNext())
            {
                Resource violation = it.next();
                // connect Response to ConstraintViolations
                ex.getModel().add(exception, ResourceFactory.createProperty("http://www.w3.org/ns/prov#wasDerivedFrom"), violation);
            }
        }
        finally
        {
            it.close();
        }
        
        return getResponseBuilder(DatasetFactory.create(ex.getModel())).
                status(Response.Status.BAD_REQUEST).
                build();
    }
    
}