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Getter methods for Boolean properties may begin with is instead of get You can choose how the state of an instance of your persistent classes should be persisted by Hibernate, either through direct access to its fields or through accessor methods Your class design isn t disturbed by these considerations You can make some accessor methods nonpublic or completely remove them Some getter and setter methods do something more sophisticated than access instance variables (validation, for example), but trivial accessor methods are common Their primary advantage is providing an additional buffer between the internal representation and the public interface of the class, allowing independent refactoring of both The example in listing 31 also defines a business method that calculates the cost of shipping an item to a particular user (we left out the implementation of this method)..

What are the requirements for JPA entity classes The good news is that so far, all the conventions we ve discussed for POJOs are also requirements for JPA entities. You have to apply some additional rules, but they re equally simple; we ll come back to them later. Now that we ve covered the basics of using POJO persistent classes as a programming model, let s see how to handle the associations between those classes.

This enables you to expand a file into a directory tree, where you can then verify that files and directories are in place either manually, or within the build file using the <available> and <filesmatch> tests Graphical tools may be easier to use, but they have a habit of changing the case of directories for usability, which can cause confusion Thus, 149.

You use properties to express associations between POJO classes, and you use accessor methods to navigate from object to object at runtime. Let s consider the associations defined by the Category class, as shown in figure 3.3. As with all our diagrams, we left out the associationrelated attributes (let s call them parentCategory and Figure 3.3 Diagram of the Category childCategories) because they would clutter the illustra- class with associations tion. These attributes and the methods that manipulate their values are called scaffolding code. This is what the scaffolding code for the one-to-many self-association of Category looks like:

<target name="unjar" depends="dist" > <unjar src="${jarfile.path}" dest="${build.dir}/unjar"/> </target>

public class Category { private String name; private Category parentCategory; private Set childCategories = new HashSet(); public Category() { } ... }

The task takes a source file, specified by src, and a destination directory, dest, and unzips the file into the directory, preserving the hierarchy. It is dependency-aware; files will not be overwritten if they are newer, and the timestamp of the files in the archive is propagated to the unzipped files, except on Java 1.1. You can selectively unzip parts of the archive, which may save time when the file is large. To use the task to validate the build process, after the archive has been unzipped, you should check for the existence of needed files, or perhaps even their values:

To allow bidirectional navigation of the association, you require two attributes. The parentCategory field implements the single-valued end of the association and is declared to be of type Category. The many-valued end, implemented by the childCategories field, must be of collection type. You choose a Set, because duplicates are disallowed, and initialize the instance variable to a new instance of HashSet. Hibernate requires interfaces for collection-typed attributes, so you must use java.util.Set or java.util.List rather than HashSet, for example. This is consistent with the requirements of the JPA specification for collections in entities. At runtime, Hibernate wraps the HashSet instance with an instance of one of Hibernate s own classes. (This special class isn t visible to the application code.) It s

good practice to program to collection interfaces anyway, rather than concrete implementations, so this restriction shouldn t bother you. You now have some private instance variables but no public interface to allow access from business code or property management by Hibernate (if it shouldn t access the fields directly). Let s add some accessor methods to the class:

<target name="test-dist" depends="dist" > <unjar src="${antbook-ant.jar}" dest="${build.dir}/unjar"> <patternset> <include name="org/**"/> </patternset> </unjar> <condition property="jar.uptodate"> <filesmatch file1="${build.dir}/classes/org/example/antbook/Search.class" file2="${build.dir}/unjar/org/example/antbook/Search.class" /> </condition> <fail unless="jar.uptodate" message="file mismatch in JAR"/> </target>

public String getName() { return name; } public void setName(String name) { this.name = name; } public Set getChildCategories() { return childCategories; } public void setChildCategories(Set childCategories) { this.childCategories = childCategories; } public Category getParentCategory() { return parentCategory; } public void setParentCategory(Category parentCategory) { this.parentCategory = parentCategory; }