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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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