content: /*
   *  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 org.apache.causeway.core.metamodel.commons;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  public final class MapUtil {
  
      private MapUtil() {
      }
  
      /**
       * Converts a list of objects [a, 1, b, 2] into a map {a -> 1; b -> 2}
       */
      @SuppressWarnings("unchecked")
      public static <K,V> Map<K,V> asMap(Object... keyValPair){
          Map<K,V> map = new HashMap<K,V>();
  
          if(keyValPair.length % 2 != 0){
              throw new IllegalArgumentException("Keys and values must be pairs.");
          }
  
          for(int i = 0; i < keyValPair.length; i += 2){
              map.put((K) keyValPair[i], (V) keyValPair[i+1]);
          }
  
          return Collections.unmodifiableMap(map);
      }
  }
  