1 package groovy.lang;
2
3 /***
4 * Implementers of this interface can be registered in the ProxyMetaClass for
5 * notifications about method calls for objects managed by the ProxyMetaClass.
6 * See groovy/lang/InterceptorTest.groovy for details.
7 * @author Dierk Koenig
8 */
9 public interface Interceptor {
10 /***
11 * This code is executed before the method is optionally called.
12 * @param object receiver object for the method call
13 * @param methodName name of the method to call
14 * @param arguments arguments to the method call
15 * @return any arbitrary result that replaces the result of the
16 * original method call only if doInvoke() returns false and afterInvoke()
17 * relays this result.
18 */
19 Object beforeInvoke(Object object, String methodName, Object[] arguments);
20 /***
21 * This code is executed after the method is optionally called.
22 * @param object receiver object for the called method
23 * @param methodName name of the called method
24 * @param arguments arguments to the called method
25 * @param result result of the executed method call or result of beforeInvoke if method was not called
26 * @return any arbitrary result that can replace the result of the
27 * original method call. Typically, the result parameter is returned.
28 */
29 Object afterInvoke(Object object, String methodName, Object[] arguments, Object result);
30 /***
31 * @return whether the target method should be invoked at all.
32 */
33 boolean doInvoke();
34 }