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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2011-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 *
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package org.glassfish.jersey.server.model.internal;

import java.lang.reflect.InvocationHandler;

import javax.ws.rs.ProcessingException;
import javax.ws.rs.container.ResourceContext;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.Request;
import javax.ws.rs.core.Response;

import javax.inject.Singleton;

import org.glassfish.jersey.server.model.Invocable;
import org.glassfish.jersey.server.spi.internal.ResourceMethodDispatcher;

/**
 * Specific resource method dispatcher for dispatching requests to a void
 * {@link java.lang.reflect.Method Java method} with no input arguments
 * using a supplied {@link InvocationHandler Java method invocation handler}.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 * @author Jakub Podlesak (jakub.podlesak at oracle.com)
 */
@Singleton
final class VoidVoidDispatcherProvider implements ResourceMethodDispatcher.Provider {

    @Context
    private ResourceContext resourceContext;

    private static class VoidToVoidDispatcher extends AbstractJavaResourceMethodDispatcher {

        private VoidToVoidDispatcher(Invocable resourceMethod, InvocationHandler handler) {
            super(resourceMethod, handler);
        }

        @Override
        public Response doDispatch(Object resource, Request request) throws ProcessingException {
            invoke(resource);
            return Response.noContent().build();
        }
    }

    @Override
    public ResourceMethodDispatcher create(Invocable resourceMethod, InvocationHandler handler) {
        if (resourceMethod.getHandlingMethod().getReturnType() != void.class || !resourceMethod.getParameters().isEmpty()) {
            return null;
        }

        return resourceContext.initResource(new VoidToVoidDispatcher(resourceMethod, handler));
    }
}