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HTTP server implementing a REST-style protocol

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/*******************************************************************************
 * Copyright (c) 2015 Eclipse RDF4J contributors, Aduna, and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Distribution License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 *******************************************************************************/
package org.eclipse.rdf4j.http.server.protocol;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.rdf4j.common.webapp.views.SimpleResponseView;
import org.eclipse.rdf4j.http.protocol.Protocol;
import org.springframework.context.ApplicationContextException;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;

/**
 * Handles requests for protocol information. Currently returns the protocol version as plain text.
 *
 * @author Herko ter Horst
 */
public class ProtocolController extends AbstractController {

	public ProtocolController() throws ApplicationContextException {
		setSupportedMethods(new String[] { METHOD_GET, METHOD_HEAD });
	}

	@Override
	protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		Map model = new HashMap<>();
		model.put(SimpleResponseView.CONTENT_KEY, Protocol.VERSION);
		return new ModelAndView(SimpleResponseView.getInstance(), model);
	}
}