1 /* 2 * Copyright (C) 2008 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 static com.google.common.base.Preconditions.checkNotNull; 20 21 import com.google.common.collect.ImmutableList; 22 import com.google.inject.Binder; 23 import com.google.inject.matcher.Matcher; 24 import java.lang.reflect.Method; 25 import java.util.List; 26 import org.aopalliance.intercept.MethodInterceptor; 27 28 /** 29 * Registration of interceptors for matching methods of matching classes. Instances are created 30 * explicitly in a module using {@link com.google.inject.Binder#bindInterceptor( Matcher, Matcher, 31 * MethodInterceptor[]) bindInterceptor()} statements: 32 * 33 * <pre> 34 * bindInterceptor(Matchers.subclassesOf(MyAction.class), 35 * Matchers.annotatedWith(Transactional.class), 36 * new MyTransactionInterceptor());</pre> 37 * 38 * or from an injectable type listener using {@link TypeEncounter#bindInterceptor(Matcher, 39 * org.aopalliance.intercept.MethodInterceptor[]) TypeEncounter.bindInterceptor()}. 40 * 41 * @author jessewilson@google.com (Jesse Wilson) 42 * @since 2.0 43 */ 44 public final class InterceptorBinding implements Element { 45 private final Object source; 46 private final Matcher<? super Class<?>> classMatcher; 47 private final Matcher<? super Method> methodMatcher; 48 private final ImmutableList<MethodInterceptor> interceptors; 49 InterceptorBinding( Object source, Matcher<? super Class<?>> classMatcher, Matcher<? super Method> methodMatcher, MethodInterceptor[] interceptors)50 InterceptorBinding( 51 Object source, 52 Matcher<? super Class<?>> classMatcher, 53 Matcher<? super Method> methodMatcher, 54 MethodInterceptor[] interceptors) { 55 this.source = checkNotNull(source, "source"); 56 this.classMatcher = checkNotNull(classMatcher, "classMatcher"); 57 this.methodMatcher = checkNotNull(methodMatcher, "methodMatcher"); 58 this.interceptors = ImmutableList.copyOf(interceptors); 59 } 60 61 @Override getSource()62 public Object getSource() { 63 return source; 64 } 65 getClassMatcher()66 public Matcher<? super Class<?>> getClassMatcher() { 67 return classMatcher; 68 } 69 getMethodMatcher()70 public Matcher<? super Method> getMethodMatcher() { 71 return methodMatcher; 72 } 73 getInterceptors()74 public List<MethodInterceptor> getInterceptors() { 75 return interceptors; 76 } 77 78 @Override acceptVisitor(ElementVisitor<T> visitor)79 public <T> T acceptVisitor(ElementVisitor<T> visitor) { 80 return visitor.visit(this); 81 } 82 83 @Override applyTo(Binder binder)84 public void applyTo(Binder binder) { 85 binder 86 .withSource(getSource()) 87 .bindInterceptor( 88 classMatcher, 89 methodMatcher, 90 interceptors.toArray(new MethodInterceptor[interceptors.size()])); 91 } 92 } 93