ImmutableMap.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.leansoft.luxun.utils;

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

/**
 * Simple Map factory
 * 
 */
@SuppressWarnings("unchecked")
public class ImmutableMap {

    public static <K, V> Map<K, V> of(K k, V v) {
        return of(new KV<K, V>(k, v));
    }

    public static <K, V> Map<K, V> of(K k1, V v1, K k2, V v2) {
        return of0(new KV<K, V>(k1, v1), new KV<K, V>(k2, v2));
    }

    public static <K, V> Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3) {
        return of0(new KV<K, V>(k1, v1), new KV<K, V>(k2, v2), new KV<K, V>(k3, v3));
    }

    public static <K, V> Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4) {
        return of0(new KV<K, V>(k1, v1), new KV<K, V>(k2, v2), new KV<K, V>(k3, v3), new KV<K, V>(k4, v4));
    }

    public static <K, V> Map<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5) {
        return of0(new KV<K, V>(k1, v1), new KV<K, V>(k2, v2), new KV<K, V>(k3, v3), new KV<K, V>(k4, v4), new KV<K, V>(k5, v5));
    }

    public static <K, V> Map<K, V> of(KV<K, V> kv) {
        Map<K, V> map = new HashMap<K, V>();
        map.put(kv.k, kv.v);
        return map;
    }

    private static <K, V> Map<K, V> of0(KV<K, V>... kvs) {
        Map<K, V> map = new HashMap<K, V>();
        for (KV<K, V> kv : kvs) {
            map.put(kv.k, kv.v);
        }
        return map;
    }
}