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Because this task ensures that source code changes are picked up more reliably, we always use this task in our projects. Sometimes the fact that it cannot detect dependencies upon imported constants (static final data) catches us out, as their changes do not propagate: remember to clean build every time you change a public constant. A regular clean build is always a good idea. 10.2.4 Grammar parsing with JavaCC The Lucene indexing and search engine that we ve incorporated into our example application allows for sophisticated search expressions such as these:

laptops.setName("Laptop Computers"); // Modify laptopUltraPortable.setName("Ultra-Portable Notebooks"); // Modify laptopTabletPCs.setName("Tablet Computers"); // Modify Category laptopBags = new Category("Laptop Bags"); laptops.addChildCategory(laptopBags); // Add

You add a new category (laptopBags) as a child of the Laptops category, and modify all three existing categories. The following code propagates all these changes to the database:

Under the hood, Lucene s API can perform searches by using a Query object, which can be constructed either through the API directly (for example, a nested set of BooleanQuery objects), or more simply using the QueryParser, which takes expressions like those just shown and parses them into a Query object. The parsing of such expressions into Java objects can be done by using a grammar compiler. There are two grammar compilers with built-in Ant support: ANTLR and JavaCC. Because our particular application uses Lucene and because Lucene takes advantage of JavaCC, we feature it here. JavaCC is a Java grammar compiler that compiles .jj files into .java source code. The Lucene query parser, for example, is written using JavaCC, compiled into .java files during Lucene s build process, and then compiled using the standard <javac> task. If you re writing your own meta-language by using JavaCC, the Ant <javacc> task is the quickest way to integrate the two-step sequence into your build process. The <javacc> task is simply a wrapper around the JavaCC command-line compiler. Listing 10.4 is a piece of Lucene s own build file that uses the <javacc> task.

Session session = sessionFactory.openSession(); Transaction tx = session.beginTransaction(); // Update three old Category instances and insert the new one session.saveOrUpdate(laptops); tx.commit(); session.close();

<target name="compile" depends="init,javacc_check" if="javacc.present"> <!-- ... --> Outputs to temporary directory <javacc target="${src.dir}/org/apache/lucene/queryParser/QueryParser.jj" javacchome="${javacc.zip.dir}" outputdirectory="${build.src}/org/apache/lucene/queryParser"/> <javac srcdir="${src.dir}:${build.src}" includes="org/**/*.java"

Because you specify cascade="save-update" on the childCategories collection, Hibernate determines what is needed to persist the objects to the database. In this case, it queues three SQL UPDATE statements (for laptops, laptopUltraPortable, laptopTablePCs) and one INSERT (for laptopBags). The saveOrUpdate() method tells Hibernate to propagate the state of an instance to the database by creating a new database row if the instance is a new transient instance or updating the existing row if the instance is a detached instance. More experienced Hibernate users use saveOrUpdate() exclusively; it s much easier to let Hibernate decide what is new and what is old, especially in a more complex network of objects with mixed state. The only (not really serious) disadvantage of exclusive saveOrUpdate() is that it sometimes can t guess whether an instance is old or new without firing a SELECT at the database for example, when a class is mapped with a natural composite key and no version or timestamp property. How does Hibernate detect which instances are old and which are new A range of options is available. Hibernate assumes that an instance is an unsaved transient instance if:

Regular expression replacement If you re coming from a Unix and a Make-based build, chances are you ll be wondering where sed, awk, and Perl are hiding in Ant. The <replaceregexp> task is not quite a full-fledged version of those handy tools, but it can be just what you need to solve some of those tricky build process issues. Let s demonstrate regular expression replacement with an example: an application uses a file display.properties to define sort.order as a comma-delimited list. The application uses this information to provide default sorting of names displayed.

The identifier property is null. The version or timestamp property (if it exists) is null. A new instance of the same persistent class, created by Hibernate internally, has the same database identifier value as the given instance. You supply an unsaved-value in the mapping document for the class, and the value of the identifier property matches. The unsaved-value attribute is also available for version and timestamp mapping elements. Entity data with the same identifier value isn t in the second-level cache. You supply an implementation of org.hibernate.Interceptor and return Boolean.TRUE from Interceptor.isUnsaved() after checking the instance in your own code.