appserver/web/jersey-ejb-component-provider/src/main/java/org/glassfish/jersey/gf/ejb/internal/EjbExceptionMapper.java

/*
 * Copyright (c) 2012, 2020 Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2021 Contributors to the Eclipse Foundation
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

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

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

import jakarta.ejb.EJBException;
import jakarta.inject.Inject;
import jakarta.inject.Provider;

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

/**
 * Helper class to handle exceptions wrapped by the EJB container with EJBException.
 * If this mapper was not registered, no {@link WebApplicationException}
 * would end up mapped to the corresponding response.
 *
 * @author Paul Sandoz
 * @author Jakub Podlesak
 */
public class EjbExceptionMapper implements ExtendedExceptionMapper<EJBException> {

    private final Provider<ExceptionMappers> mapperProvider;

    /**
     * Create new EJB exception mapper.
     *
     * @param mapperProvider utility to find mapper delegate.
     */
    @Inject
    public EjbExceptionMapper(final Provider<ExceptionMappers> mapperProvider) {
        this.mapperProvider = mapperProvider;
    }


    @Override
    public Response toResponse(final EJBException exception) {
        return causeToResponse(exception);
    }


    @Override
    public boolean isMappable(final EJBException exception) {
        try {
            return causeToResponse(exception) != null;
        } catch (final Throwable ignored) {
            return false;
        }
    }


    private Response causeToResponse(final EJBException exception) {
        final Exception cause = exception.getCausedByException();
        if (cause != null) {
            final ExceptionMapper mapper = mapperProvider.get().findMapping(cause);
            if (mapper != null && mapper != this) {
                return mapper.toResponse(cause);
            } else if (cause instanceof WebApplicationException) {
                return ((WebApplicationException) cause).getResponse();
            }
        }
        return null;
    }
}