1 /* 2 * Copyright (C) 2007 Google Inc. 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 com.google.inject.assistedinject; 18 19 import static java.lang.annotation.ElementType.CONSTRUCTOR; 20 import static java.lang.annotation.RetentionPolicy.RUNTIME; 21 22 import com.google.inject.Inject; 23 import java.lang.annotation.Retention; 24 import java.lang.annotation.Target; 25 26 /** 27 * When used in tandem with {@link FactoryModuleBuilder}, constructors annotated with 28 * {@code @AssistedInject} indicate that multiple constructors can be injected, each with different 29 * parameters. AssistedInject annotations should not be mixed with {@literal @}{@link Inject} 30 * annotations. The assisted parameters must exactly match one corresponding factory method within 31 * the factory interface, but the parameters do not need to be in the same order. Constructors 32 * annotated with AssistedInject <b>are</b> created by Guice and receive all the benefits (such as 33 * AOP). 34 * 35 * <p><strong>Obsolete Usage:</strong> When used in tandem with {@link FactoryProvider}, 36 * constructors annotated with {@code @AssistedInject} trigger a "backwards compatibility mode". The 37 * assisted parameters must exactly match one corresponding factory method within the factory 38 * interface and all must be in the same order as listed in the factory. In this backwards 39 * compatable mode, constructors annotated with AssistedInject <b>are not</b> created by Guice and 40 * thus receive none of the benefits. 41 * 42 * <p>Constructor parameters must be either supplied by the factory interface and marked with <code> 43 * @Assisted</code>, or they must be injectable. 44 * 45 * @author jmourits@google.com (Jerome Mourits) 46 * @author jessewilson@google.com (Jesse Wilson) 47 */ 48 @Target({CONSTRUCTOR}) 49 @Retention(RUNTIME) 50 public @interface AssistedInject {} 51