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   *   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
   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
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   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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  package org.apache.cayenne.di.spi;
  
  import java.lang.reflect.ParameterizedType;
  import java.lang.reflect.Type;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.cayenne.di.Key;
  
  /**
   * A helper class used by Cayenne DI implementation.
   * 
   * @since 3.1
   */
  class DIUtil {
  
      static Class<?> parameterClass(Type type) {
  
          if (type instanceof ParameterizedType) {
              ParameterizedType parameterizedType = (ParameterizedType) type;
              Type[] parameters = parameterizedType.getActualTypeArguments();
  
              if (parameters.length == 1) {
                  return typeToClass(parameters[0]);
              }
          }
  
          return null;
      }
  
      static Class<?>[] allParametersClass(Type type) {
          Class<?>[] arr = null;
  
          if (type instanceof ParameterizedType) {
              ParameterizedType parameterizedType = (ParameterizedType) type;
              Type[] parameters = parameterizedType.getActualTypeArguments();
              arr = new Class[parameters.length];
              int i=0;
              for(Type next : parameters) {
                  arr[i++] = typeToClass(next);
              }
          }
  
          return arr;
      }
  
      static Key<?> getKeyForTypeAndGenericType(Class<?> type, Type genericType, String bindingName) {
          if(List.class.isAssignableFrom(type)) {
              Class<?> objectClass = parameterClass(genericType);
              if(objectClass == null) {
                  objectClass = Object.class;
              }
              return Key.getListOf(objectClass, bindingName);
          } else if(Map.class.isAssignableFrom(type)) {
              Class<?>[] classes = DIUtil.allParametersClass(genericType);
              if(classes == null) {
                  classes = new Class[]{Object.class, Object.class};
              }
  
              return Key.getMapOf(classes[0], classes[1], bindingName);
          }
  
          return Key.get(type, bindingName);
      }
  
      static Class<?> typeToClass(Type type) {
          if(type instanceof Class) {
              return  (Class<?>) type;
          } else if(type instanceof ParameterizedType){
              return  (Class<?>) ((ParameterizedType)type).getRawType();
          } else {
              return Object.class;
          }
      }
  }
  