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 25 import org.aopalliance.intercept.MethodInterceptor; 26 27 import java.lang.reflect.Method; 28 import java.util.List; 29 30 /** 31 * Registration of interceptors for matching methods of matching classes. Instances are created 32 * explicitly in a module using {@link com.google.inject.Binder#bindInterceptor( 33 * Matcher, Matcher, MethodInterceptor[]) bindInterceptor()} statements: 34 * <pre> 35 * bindInterceptor(Matchers.subclassesOf(MyAction.class), 36 * Matchers.annotatedWith(Transactional.class), 37 * new MyTransactionInterceptor());</pre> 38 * 39 * or from an injectable type listener using {@link TypeEncounter#bindInterceptor(Matcher, 40 * org.aopalliance.intercept.MethodInterceptor[]) TypeEncounter.bindInterceptor()}. 41 * 42 * @author jessewilson@google.com (Jesse Wilson) 43 * @since 2.0 44 */ 45 public final class InterceptorBinding implements Element { 46 private final Object source; 47 private final Matcher<? super Class<?>> classMatcher; 48 private final Matcher<? super Method> methodMatcher; 49 private final ImmutableList<MethodInterceptor> interceptors; 50 InterceptorBinding( Object source, Matcher<? super Class<?>> classMatcher, Matcher<? super Method> methodMatcher, MethodInterceptor[] interceptors)51 InterceptorBinding( 52 Object source, 53 Matcher<? super Class<?>> classMatcher, 54 Matcher<? super Method> methodMatcher, 55 MethodInterceptor[] interceptors) { 56 this.source = checkNotNull(source, "source"); 57 this.classMatcher = checkNotNull(classMatcher, "classMatcher"); 58 this.methodMatcher = checkNotNull(methodMatcher, "methodMatcher"); 59 this.interceptors = ImmutableList.copyOf(interceptors); 60 } 61 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 acceptVisitor(ElementVisitor<T> visitor)78 public <T> T acceptVisitor(ElementVisitor<T> visitor) { 79 return visitor.visit(this); 80 } 81 applyTo(Binder binder)82 public void applyTo(Binder binder) { 83 binder.withSource(getSource()).bindInterceptor(classMatcher, methodMatcher, 84 interceptors.toArray(new MethodInterceptor[interceptors.size()])); 85 } 86 } 87