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package org.glassfish.jersey.gf.cdi.internal;

import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.spi.BeanManager;
import javax.inject.Inject;
import javax.inject.Provider;

import javax.transaction.TransactionalException;

import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;
import javax.ws.rs.ext.ExceptionMapper;

import org.glassfish.jersey.spi.ExceptionMappers;
import org.glassfish.jersey.spi.ExtendedExceptionMapper;

/**
 * Helper class to handle exceptions thrown by JTA layer. If this mapper was not
 * registered, no {@link WebApplicationException} thrown from a transactional
 * CDI bean would get properly mapped to corresponding response.
 *
 * @author Jakub Podlesak (jakub.podlesak at oracle.com)
 */
@ApplicationScoped
public class TransactionalExceptionMapper implements ExtendedExceptionMapper {

    @Inject
    WebAppExceptionHolder waeHolder;

    @Inject BeanManager beanManager;

    @Inject
    Provider mappers;

    @Override
    public Response toResponse(TransactionalException exception) {
        final ExceptionMapper mapper = mappers.get().findMapping(exception);

        if (mapper != null && !TransactionalExceptionMapper.class.isAssignableFrom(mapper.getClass())) {
            return mapper.toResponse(exception);
        } else {
            if (waeHolder != null) {
                final WebApplicationException wae = waeHolder.exception;
                if (wae != null) {
                    return wae.getResponse();
                }
            }
            throw exception;
        }
    }

    @Override
    public boolean isMappable(TransactionalException exception) {
        return true;
    }
}