?? interceptor.java
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package groovy.lang;
/**
* Implementers of this interface can be registered in the ProxyMetaClass for
* notifications about method calls for objects managed by the ProxyMetaClass.
* See groovy/lang/InterceptorTest.groovy for details.
* @author Dierk Koenig
*/
public interface Interceptor {
/**
* This code is executed before the method is optionally called.
* @param object receiver object for the method call
* @param methodName name of the method to call
* @param arguments arguments to the method call
* @return any arbitrary result that replaces the result of the
* original method call only if doInvoke() returns false and afterInvoke()
* relays this result.
*/
Object beforeInvoke(Object object, String methodName, Object[] arguments);
/**
* This code is executed after the method is optionally called.
* @param object receiver object for the called method
* @param methodName name of the called method
* @param arguments arguments to the called method
* @param result result of the executed method call or result of beforeInvoke if method was not called
* @return any arbitrary result that can replace the result of the
* original method call. Typically, the result parameter is returned.
*/
Object afterInvoke(Object object, String methodName, Object[] arguments, Object result);
/**
* @return whether the target method should be invoked at all.
*/
boolean doInvoke();
}
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