content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * 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 io.activej.inject.impl;
  
  import io.activej.inject.Key;
  import io.activej.inject.binding.Binding;
  import io.activej.inject.binding.BindingGenerator;
  import org.jetbrains.annotations.Nullable;
  
  /**
   * This function is passed to a {@link BindingGenerator generator} when trying to generate a binding.
   * <p>
   * Generators can depend on other bindings that could not be present but can be generated.
   * This function is used as a mean of recursion - when no requested binding is present it tries to generate it,
   * and it is called from the generator itself.
   */
  @FunctionalInterface
  public interface BindingLocator {
  	/**
  	 * Retrieves existing binding for given key or tries to recursively generate it from known {@link BindingGenerator generators}.
  	 */
  	<T> @Nullable Binding<T> get(Key<T> key);
  }
  