1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
<chapter id="idioms" xreflabel="Idioms">
<title>Idioms</title>
<sect1 id="idioms-intro">
<title>Introduction</title>
<para>
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.
</para>
<para>
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.
</para>
<programlisting><![CDATA[
/* 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";
]]></programlisting>
<para>Any call to an instance of a subtype of AbstractFacade whose class is
not exactly equal to AbstractFacade:</para>
<programlisting><![CDATA[
pointcut nonAbstract(AbstractFacade af):
call(* *(..))
&& target(af)
&& !if(af.getClass() == AbstractFacade.class);
]]></programlisting>
<para> If AbstractFacade is an abstract class or an interface, then every
instance must be of a subtype and you can replace this with: </para>
<programlisting><![CDATA[
pointcut nonAbstract(AbstractFacade af):
call(* *(..))
&& target(af);
]]></programlisting>
<para> Any call to a method which is defined by a subtype of
AbstractFacade, but which isn't defined by the type AbstractFacade itself:
</para>
<programlisting><![CDATA[
pointcut callToUndefinedMethod():
call(* AbstractFacade+.*(..))
&& !call(* AbstractFacade.*(..));
]]></programlisting>
<para> 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:
</para>
<programlisting><![CDATA[
pointcut executionOfUndefinedMethod():
execution(* *(..))
&& within(AbstractFacade+)
&& !within(AbstractFacade)
]]></programlisting>
</sect1>
</chapter>
|
