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.Binder; 20 import com.google.inject.TypeLiteral; 21 import com.google.inject.matcher.Matcher; 22 23 /** 24 * Binds types (picked using a Matcher) to an type listener. Registrations are created explicitly in 25 * a module using {@link com.google.inject.Binder#bindListener(Matcher, TypeListener)} statements: 26 * 27 * <pre> 28 * register(only(new TypeLiteral<PaymentService<CreditCard>>() {}), listener);</pre> 29 * 30 * @author jessewilson (at) google.com (Jesse Wilson) 31 * @since 2.0 32 */ 33 public final class TypeListenerBinding implements Element { 34 35 private final Object source; 36 private final Matcher<? super TypeLiteral<?>> typeMatcher; 37 private final TypeListener listener; 38 39 TypeListenerBinding(Object source, TypeListener listener, 40 Matcher<? super TypeLiteral<?>> typeMatcher) { 41 this.source = source; 42 this.listener = listener; 43 this.typeMatcher = typeMatcher; 44 } 45 46 /** Returns the registered listener. */ 47 public TypeListener getListener() { 48 return listener; 49 } 50 51 /** Returns the type matcher which chooses which types the listener should be notified of. */ 52 public Matcher<? super TypeLiteral<?>> getTypeMatcher() { 53 return typeMatcher; 54 } 55 56 public Object getSource() { 57 return source; 58 } 59 60 public <T> T acceptVisitor(ElementVisitor<T> visitor) { 61 return visitor.visit(this); 62 } 63 64 public void applyTo(Binder binder) { 65 binder.withSource(getSource()).bindListener(typeMatcher, listener); 66 } 67 } 68
