Package org.aopalliance.intercept
Interface FieldInterceptor
- All Superinterfaces:
Advice
,Interceptor
Intercepts field access on a target object.
The user should implement the set(FieldAccess)
and
get(FieldAccess)
methods to modify the original
behavior. E.g. the following class implements a tracing interceptor
(traces the accesses to the intercepted field(s)):
class TracingInterceptor implements FieldInterceptor { Object set(FieldAccess fa) throws Throwable { System.out.println("field "+fa.getField()+" is set with value "+ fa.getValueToSet()); Object ret=fa.proceed(); System.out.println("field "+fa.getField()+" was set to value "+ret); return ret; } Object get(FieldAccess fa) throws Throwable { System.out.println("field "+fa.getField()+" is about to be read"); Object ret=fa.proceed(); System.out.println("field "+fa.getField()+" was read; value is "+ret); return ret; } }
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Method Summary
Modifier and TypeMethodDescriptionget
(FieldAccess fieldRead) Do the stuff you want to do before and after the field is getted.set
(FieldAccess fieldWrite) Do the stuff you want to do before and after the field is setted.
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Method Details
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get
Do the stuff you want to do before and after the field is getted.Polite implementations would certainly like to call
Joinpoint.proceed()
.- Parameters:
fieldRead
- the joinpoint that corresponds to the field read- Returns:
- the result of the field read
Joinpoint.proceed()
, might be intercepted by the interceptor. - Throws:
Throwable
- if the interceptors or the target-object throws an exception.
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set
Do the stuff you want to do before and after the field is setted.Polite implementations would certainly like to implement
Joinpoint.proceed()
.- Parameters:
fieldWrite
- the joinpoint that corresponds to the field write- Returns:
- the result of the field set
Joinpoint.proceed()
, might be intercepted by the interceptor. - Throws:
Throwable
- if the interceptors or the target-object throws an exception.
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