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The previous keywords allowed you to select joinpoints based on their types. In many situations, you must also select joinpoints based on where the code corresponding to the joinpoint is defined (using the within and withincode keywords) and on whether the declaring class defines any given methods or fields (using the has and hasfield keywords). The within keyword is associated with a class expression, such as within(aop.jboss.*.). This pointcut-definition snippet includes only the joinpoints that are defined in the corresponding classes. In the example, the classes belong to the aop.jboss package. The withincode keyword plays the same role for method and constructor expressions. For example, the expression withincode(public *->*(..)) includes the joinpoints that are defined in a public method or constructor. A pointcut expression containing the has keyword includes only the joinpoints defined in a class that contain the given method (or methods, if the expression contains wildcards). For instance, the expression has(void *->foo(..)) selects the joinpoints declared in any class that contains a method named foo. The hasfield keyword plays the same role for field expressions. Note that these filtering operators are seldom used alone. Usually they are combined with logical operators and with keywords for selecting joinpoint types. For example, the expression <bind pointcut="call(* aop.jboss.Order->addItem(..)) AND withincode(* aop.jboss.Customer->run())" > selects the joinpoints that are located in the run method of the Customer class and where the addItem method of the Order class is called.

The second file Ant needs for this recipe is the build.xml file, shown in listing 9.2. As we move on to the next recipes, we will be adding to this file to accomplish

@Embedded protected Address address; public User() {} }

@Embeddable public class Address implements Serializable { @Column(name="STREET", nullable=false) protected String street; @Column(name="CITY", nullable=false) protected String city; @Column(name="STATE", nullable=false) protected String state;

*/ public static ch2.UserHome getHome( Hashtable environment ) throws NamingException { // Obtain initial context Looks up InitialContext initialContext = and stores the new InitialContext(environment); home interface try { java.lang.Object objRef = initialContext.lookup(ch2.UserHome.COMP_NAME); return (ch2.UserHome) PortableRemoteObject.narrow(objRef, ch2.UserHome.class); } finally { initialContext.close(); } } /** * Obtain local home interface from default initial context * @return Local home interface for ch2.User. Lookup using COMP_NAME */ public static ch2.UserLocalHome getLocalHome() throws NamingException { // Local homes shouldn't be narrowed, // as there is no RMI involved. if (cachedLocalHome == null) { // Obtain initial context InitialContext initialContext = new InitialContext(); try { cachedLocalHome = (ch2.UserLocalHome) initialContext.lookup(ch2.UserLocalHome.COMP_NAME); } finally { initialContext.close(); Looks up and } stores the local } home interface return cachedLocalHome; } }

@Column(name="ZIP_CODE", nullable=false) protected String zipCode; @Column(name="COUNTRY", nullable=false) protected String country; }

In the previous section, we presented the definition of a pointcut expression with the <bind> tag. In this section, we will present the mechanism that associates a pointcut with an interceptor.

Briefly scanning listing 8.4, you see that the User entity is mapped to the USERS table joined with the USER_PICTURES table using the USER_ID primary key. Each of the fields is mapped to a database column using the @Column annotation b. We deliberately made the listing feature-rich, and quite a few interesting things are going on with the columns. The userType field is restricted to be an ordinal enumeration C. The picture field is marked as a binary large object (BLOB) D that is lazily loaded E. The creationDate field is marked as a temporal type F. The address field is an embedded object G. The column mapping for Address object is defined in the object H using the @Column annotation. All in all, the @Table, @SecondaryTable, @Column, @Enumerated, @Lob, @Basic, @Temporal, @Embedded, and @Embeddable ORM annotations are used. Let s start our analysis of O/R with the @Table annotation.

In addition to the cacheHomes attribute, you could add the generate attribute to the @ejb.util tag to specify whether the generated utility class should use the JNDI name or the component name from the home interface to perform a lookup (see recipe 2.2). The default behavior for the utility object is to use the JNDI name, but the possible values are false, logical, or physical. Keep in mind that

particularly useful in reporting. Let s assume that there is an optional relationship between User and Category and we want to generate a report that prints all the Category names for the user. If the user doesn t have any Category, then we want to print NULL. If we specify the User on the left side of the JOIN, we can use either the LEFT JOIN or LEFT OUTER JOIN keyword phrases with a JPQL query as follows: