/*
* Copyright 2002-2016 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.aopalliance.intercept;
import org.aopalliance.aop.Advice;
/**
* This interface represents a generic interceptor.
*
* <p>A generic interceptor can intercept runtime events that occur
* within a base program. Those events are materialized by (reified
* in) joinpoints. Runtime joinpoints can be invocations, field
* access, exceptions...
*
* <p>This interface is not used directly. Use the sub-interfaces
* to intercept specific events. For instance, the following class
* implements some specific interceptors in order to implement a
* debugger:
*
* <pre class=code>
* class DebuggingInterceptor implements MethodInterceptor,
* ConstructorInterceptor, FieldInterceptor {
*
* Object invoke(MethodInvocation i) throws Throwable {
* debug(i.getMethod(), i.getThis(), i.getArgs());
* return i.proceed();
* }
*
* Object construct(ConstructorInvocation i) throws Throwable {
* debug(i.getConstructor(), i.getThis(), i.getArgs());
* return i.proceed();
* }
*
* Object get(FieldAccess fa) throws Throwable {
* debug(fa.getField(), fa.getThis(), null);
* return fa.proceed();
* }
*
* Object set(FieldAccess fa) throws Throwable {
* debug(fa.getField(), fa.getThis(), fa.getValueToSet());
* return fa.proceed();
* }
*
* void debug(AccessibleObject ao, Object this, Object value) {
* ...
* }
* }
* </pre>
*
* @author Rod Johnson
* @see Joinpoint
*/
public interface Interceptor extends Advice {
}