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The Fedora Commons repository HTTP commons module: Provides HTTP (JAX-RS) resources and helpers for use in assembling HTTP APIs over the Fedora Commons repository framework.

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/*
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE and NOTICE files at the root of the source
 * tree.
 */
package org.fcrepo.http.commons.exceptionhandlers;

import org.fcrepo.kernel.api.exception.RepositoryRuntimeException;
import org.slf4j.Logger;

import javax.ws.rs.core.Context;
import javax.ws.rs.core.Response;
import javax.ws.rs.ext.ExceptionMapper;
import javax.ws.rs.ext.Provider;
import javax.ws.rs.ext.Providers;

import static javax.ws.rs.core.Response.serverError;
import static org.fcrepo.http.commons.domain.RDFMediaType.TEXT_PLAIN_WITH_CHARSET;
import static org.slf4j.LoggerFactory.getLogger;

/**
 * @author cabeer
 * @since 9/13/14
 */

@Provider
public class RepositoryRuntimeExceptionMapper implements
        ExceptionMapper, ExceptionDebugLogging {

    private final Providers providers;

    /**
     * Get the context Providers so we can rethrow the cause to an appropriate handler
     * @param providers the providers
     */
    public RepositoryRuntimeExceptionMapper(@Context final Providers providers) {
        this.providers = providers;
    }

    private static final Logger LOGGER = getLogger(RepositoryExceptionMapper.class);

    @Override
    public Response toResponse(final RepositoryRuntimeException e) {
        final Throwable cause = e.getCause();
        ExceptionMapper exceptionMapper = null;

        if (cause != null) {
            exceptionMapper = providers.getExceptionMapper((Class) cause.getClass());
        }

        if (exceptionMapper != null) {
            return exceptionMapper.toResponse(cause);
        }
        LOGGER.error("Caught a repository exception", e);
        return serverError().entity(null).type(TEXT_PLAIN_WITH_CHARSET).build();
    }
}