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- = Idioms
-
- [[idioms-intro]]
- == Introduction
-
- This chapter consists of very short snippets of AspectJ code, typically
- pointcuts, that are particularly evocative or useful. This section is a
- work in progress.
-
- Here's an example of how to enfore a rule that code in the `java.sql`
- package can only be used from one particular package in your system.
- This doesn't require any access to code in the `java.sql` package.
-
- [source, java]
- ....
- /* Any call to methods or constructors in java.sql */
- pointcut restrictedCall():
- call(* java.sql.*.*(..)) || call(java.sql.*.new(..));
-
- /* Any code in my system not in the sqlAccess package */
- pointcut illegalSource():
- within(com.foo..*) && !within(com.foo.sqlAccess.*);
-
- declare error: restrictedCall() && illegalSource():
- "java.sql package can only be accessed from com.foo.sqlAccess";
- ....
-
- Any call to an instance of a subtype of `AbstractFacade` whose class is
- not exactly equal to `AbstractFacade`:
-
- [source, java]
- ....
- pointcut nonAbstract(AbstractFacade af):
- call(* *(..))
- && target(af)
- && !if(af.getClass() == AbstractFacade.class);
- ....
-
- If `AbstractFacade` is an abstract class or an interface, then every
- instance must be of a subtype and you can replace this with:
-
- [source, java]
- ....
- pointcut nonAbstract(AbstractFacade af):
- call(* *(..))
- && target(af);
- ....
-
- Any call to a method which is defined by a subtype of `AbstractFacade`,
- but which isn't defined by the type `AbstractFacade` itself:
-
- [source, java]
- ....
- pointcut callToUndefinedMethod():
- call(* AbstractFacade+.*(..))
- && !call(* AbstractFacade.*(..));
- ....
-
- The execution of a method that is defined in the source code for a type
- that is a subtype of `AbstractFacade` but not in `AbstractFacade` itself:
-
- [source, java]
- ....
- pointcut executionOfUndefinedMethod():
- execution(* *(..))
- && within(AbstractFacade+)
- && !within(AbstractFacade)
- ....
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