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Anonymous pointcuts may be used in a similar manner as a part of static crosscutting. Regardless of whether a pointcut is named or anonymous, its functionality is expressed in the pointcut definition, which contains the syntax that identifies the join points. In the following sections, we examine this syntax and learn how pointcuts are constructed.
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There is a special form of named pointcut that omits the colon and the pointcut definition following it. Such a pointcut does not match any join point in the system. For example, the following pointcut will capture no join point: pointcut threadSafeOperation(); We will discuss the use of this form in section 8.5.3.
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3.1.1 Wildcards and pointcut operators Given that crosscutting concerns, by definition, span multiple modules and apply to multiple join points in a system, the language must provide an economical way to capture the required join points. AspectJ utilizes a wildcardbased syntax to construct the pointcuts in order to capture join points that share common characteristics. Three wildcard notations are available in AspectJ:
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* denotes any number of characters except the period. .. denotes any number of characters including any number of periods. + denotes any subclass or subinterface of a given type.
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Just like in Java, where unary and binary operators are used to form complex conditional expressions composed of simpler conditional expressions, AspectJ provides a unary negation operator (!) and two binary operators (|| and &&) to form complex matching rules by combining simple pointcuts:
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Unary operator AspectJ supports only one unary operation ! (the negation) that allows the matching of all join points except those specified by the pointcut. For example, we used !within(JoinPointTraceAspect) in the tracing example in listing 2.9 to exclude all the join points occurring inside the JoinPointTraceAspect s body. Binary operators AspectJ offers || and && to combine pointcuts. Combining two pointcuts with the || operator causes the selection of join points
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AspectJ: syntax basics
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that match either of the pointcuts, whereas combining them with the && operator causes the selection of join points matching both the pointcuts. The precedence between these operators is the same as in plain Java. AspectJ also allows the use of parentheses with the unary and binary operators to override the default operator precedence and make the code more legible. 3.1.2 Signature syntax In Java, the classes, interfaces, methods, and fields all have signatures. You use these signatures in pointcuts to specify the places where you want to capture join points. For example, in the following pointcut, we are capturing all the calls to the credit() method of the Account class:
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pointcut creditOperations() : call(void Account.credit(float));
When we specify patterns that will match these signatures in pointcuts, we refer to them as signature patterns. At times, a pointcut will specify a join point using one particular signature, but often it identifies join points specified by multiple signatures that are grouped together using matching patterns. In this section, we first examine three kinds of signature patterns in AspectJ type, method, and field and we then see how they are used in pointcut definitions in section 3.1.3. Pointcuts that use the wildcards *, .., and + in order to capture join points that share common characteristics in their signatures are called property-based pointcuts. We have already seen an example of a signature that uses * and .. in figure 3.1. Note that these wildcards have different usages in the type, method, and field signatures. We will point out these usages as we discuss the signatures and how they are matched. Type signature patterns The term type collectively refers to classes, interfaces, and primitive types. In AspectJ, type also refers to aspects. A type signature pattern in a pointcut specifies the join points in a type, or a set of types, at which you want to perform some crosscutting action. For a set of types, it can use wildcards, unary, and binary operators. The * wildcard is used in a type signature pattern to specify a part of the class, interface, or package name. The wildcard .. is used to denote all direct and indirect subpackages. The + wildcard is used to denote a subtype (subclass or subinterface). For example, the following signature matches JComponent and all its direct and indirect subclasses, such as JTable, JTree, JButton, and so on:
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