001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *        http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 */
019package org.apache.isis.viewer.restfulobjects.rendering.util;
020
021import java.util.Collections;
022import java.util.Map;
023
024import com.google.common.collect.Maps;
025
026public final class MapUtils {
027
028    /**
029     * Returns an immutable map based on a list of key/value pairs.
030     */
031    public static Map<String, String> mapOf(final String... keyOrValues) {
032        if (keyOrValues.length % 2 != 0) {
033            throw new IllegalArgumentException("Must provide an even number of arguments");
034        }
035        final Map<String, String> map = Maps.newLinkedHashMap();
036        String key = null;
037        for (final String keyOrValue : keyOrValues) {
038            if (key != null) {
039                map.put(key, keyOrValue);
040                key = null;
041            } else {
042                key = keyOrValue;
043            }
044        }
045        return Collections.unmodifiableMap(map);
046    }
047
048}