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  package org.apache.cayenne.di.spi;
  
  import org.apache.cayenne.di.*;
  
  import java.util.Map;
  import java.util.Map.Entry;
  
  /**
   * @since 3.1
   */
  class DefaultMapBuilder<T> extends DICollectionBuilder<Map<String, T>, T> implements MapBuilder<T> {
  
      DefaultMapBuilder(Key<Map<String, T>> bindingKey, DefaultInjector injector) {
          super(bindingKey, injector);
  
          // trigger initialization of the MapProvider right away, as we need to bind an
          // empty map even if the user never calls 'put'
          findOrCreateMapProvider();
      }
  
      @Override
      public MapBuilder<T> put(String key, Class<? extends T> interfaceType) throws DIRuntimeException {
  
          Provider<? extends T> provider = createTypeProvider(interfaceType);
          // TODO: andrus 11/15/2009 - report overriding the key??
          findOrCreateMapProvider().put(key, provider);
          return this;
      }
  
      @Override
      public MapBuilder<T> put(String key, T value) throws DIRuntimeException {
          // TODO: andrus 11/15/2009 - report overriding the key??
          findOrCreateMapProvider().put(key, createInstanceProvider(value));
          return this;
      }
  
      @Override
      public MapBuilder<T> putAll(Map<String, T> map) throws DIRuntimeException {
  
          MapProvider<T> provider = findOrCreateMapProvider();
  
          for (Entry<String, T> entry : map.entrySet()) {
              provider.put(entry.getKey(), createInstanceProvider(entry.getValue()));
          }
  
          return this;
      }
  
      private MapProvider<T> findOrCreateMapProvider() {
          MapProvider<T> provider;
  
          Binding<Map<String, T>> binding = injector.getBinding(bindingKey);
          if (binding == null) {
              provider = new MapProvider<>();
              injector.putBinding(bindingKey, provider);
          } else {
              provider = (MapProvider<T>) binding.getOriginal();
          }
  
          return provider;
      }
  }
  