1 /* 2 * Copyright (C) 2020 The Dagger Authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package dagger.assisted; 18 19 import static java.lang.annotation.ElementType.TYPE; 20 import static java.lang.annotation.RetentionPolicy.RUNTIME; 21 22 import java.lang.annotation.Documented; 23 import java.lang.annotation.Retention; 24 import java.lang.annotation.Target; 25 26 /** 27 * Annotates an abstract class or interface used to create an instance of a type via an {@link 28 * AssistedInject} constructor. 29 * 30 * <p>An {@link AssistedFactory}-annotated type must obey the following constraints: 31 * 32 * <ul> 33 * <li>The type must be an abstract class or interface, 34 * <li>The type must contain exactly one abstract, non-default method whose 35 * <ul> 36 * <li>return type must exactly match the type of an assisted injection type, and 37 * <li>parameters must match the exact list of {@link Assisted} parameters in the assisted 38 * injection type's constructor (and in the same order). 39 * </ul> 40 * </ul> 41 * 42 * See {@link AssistedInject} 43 */ 44 @Documented 45 @Retention(RUNTIME) 46 @Target(TYPE) 47 public @interface AssistedFactory {} 48