content: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * Licensed 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.google.firebase.example.fireeats.util;
  
  import android.arch.lifecycle.ViewModel;
  import android.arch.lifecycle.ViewModelProvider;
  import android.support.annotation.NonNull;
  
  import java.util.Map;
  
  import javax.inject.Inject;
  import javax.inject.Provider;
  import javax.inject.Singleton;
  
  @Singleton
  public class ViewModelFactory implements ViewModelProvider.Factory {
      private final Map<Class<? extends ViewModel>, Provider<ViewModel>> creators;
  
      @Inject
      ViewModelFactory(Map<Class<? extends ViewModel>, Provider<ViewModel>> creators) {
          this.creators = creators;
      }
  
      @NonNull
      @SuppressWarnings("unchecked")
      @Override
      public <T extends ViewModel> T create(@NonNull Class<T> modelClass) {
          Provider<? extends ViewModel> creator = creators.get(modelClass);
          if (creator == null) {
              for (Map.Entry<Class<? extends ViewModel>, Provider<ViewModel>> entry : creators.entrySet()) {
                  if (modelClass.isAssignableFrom(entry.getKey())) {
                      creator = entry.getValue();
                      break;
                  }
              }
          }
          if (creator == null) {
              throw new IllegalArgumentException("unknown model class " + modelClass);
          }
          try {
              return (T) creator.get();
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
      }
  }
  