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Jodd Madvoc is elegant web MVC framework that uses CoC and annotations in a pragmatic way to simplify web application development.

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// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

package jodd.madvoc.scope;

import jodd.madvoc.ActionRequest;
import jodd.madvoc.config.Targets;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

public class HeaderScope implements MadvocScope {

	@Override
	public void inject(final ActionRequest actionRequest, final Targets targets) {
		final HttpServletRequest servletRequest = actionRequest.getHttpServletRequest();

		targets.forEachTargetAndIn(this, (target, in) -> {
			final Enumeration headerNames = servletRequest.getHeaders(in.name());
			if (headerNames != null) {

				final List allValues = new ArrayList<>();
				while (headerNames.hasMoreElements()) {
					allValues.add(headerNames.nextElement());
				}

				final Object value;

				if (allValues.size() == 1) {
					value = allValues.get(0);
				}
				else {
					value = allValues;
				}

				target.writeValue(in, value, true);
			}
		});
	}

	@Override
	public void inject(final ServletContext servletContext, final Targets targets) {

	}

	@Override
	public void inject(final Targets targets) {

	}

	@Override
	public void outject(final ActionRequest actionRequest, final Targets targets) {
		final HttpServletResponse servletResponse = actionRequest.getHttpServletResponse();

		targets.forEachTargetAndOut(this, (target, out) -> {
			final String value = (String) target.readValue(out);
			if (value != null) {
				servletResponse.setHeader(out.name(), value);
			}
		});
	}
}