/*

 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

import java.util.Objects;

import java.util.TreeMap;

/**

 * An HttpHeaders consisting of the given name value pairs.

 */

public class FixedHttpHeaders extends HttpHeaders {

    private final Map<String, List<String>> map =

            new TreeMap<>(String.CASE_INSENSITIVE_ORDER);

    @Override

    public Map<String, List<String>> map() {

        return map;

    }

    /**

     * Creates an HttpHeaders of the given name value pairs.

     */

    public static HttpHeaders of(String... params) {

        Objects.requireNonNull(params);

        if ((params.length & 0x1) != 0)

            throw new IllegalArgumentException("odd number of params");

        FixedHttpHeaders headers = new FixedHttpHeaders();

        for (int i = 0; i < params.length; i += 2) {

            String name = params[i];

            String value = params[i + 1];

            headers.map.computeIfAbsent(name, k -> new ArrayList<>(1))

                       .add(value);

        }

        return headers;

    }

}