1 /* 2 * Copyright (C) 2009 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.spi; 18 19 import com.google.inject.TypeLiteral; 20 21 /** 22 * Listens for Guice to encounter injectable types. If a given type has its constructor injected in 23 * one situation but only its methods and fields injected in another, Guice will notify this 24 * listener once. 25 * 26 * <p>Useful for extra type checking, {@linkplain TypeEncounter#register(InjectionListener) 27 * registering injection listeners}, and {@linkplain TypeEncounter#bindInterceptor( 28 * com.google.inject.matcher.Matcher, org.aopalliance.intercept.MethodInterceptor[]) binding method 29 * interceptors}. 30 * 31 * @since 2.0 32 */ 33 public interface TypeListener { 34 35 /** 36 * Invoked when Guice encounters a new type eligible for constructor or members injection. Called 37 * during injector creation (or afterwards if Guice encounters a type at run time and creates a 38 * JIT binding). 39 * 40 * @param type encountered by Guice 41 * @param encounter context of this encounter, enables reporting errors, registering injection 42 * listeners and binding method interceptors for {@code type}. 43 * @param <I> the injectable type 44 */ hear(TypeLiteral<I> type, TypeEncounter<I> encounter)45 <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter); 46 } 47