birt code 39

birt code 39

birt code 39

birt code 39

birt code 39

birt code 39,

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

For maximum flexibility, any of the properties shown in table 8.1 could be overridden, though that is rarely, if ever, needed. Allowing user-specific overrides In our property loading hierarchy, user-specific properties are loaded after the component-specific properties, allowing per-user overrides for settings that are not hardcoded for a component. The user.home property is supplied by the JVM system properties, which Ant automatically provides, and refers to the current users operating system defined home directory. The properties file we load from the users home directory is named .build.properties, with the preceding dot (.) used to hide the file on Unix systems so the home directory doesn t look cluttered with preference files strewn about. If a user wanted to make sure their builds used a special version of a library, their ${user.home}/.build.properties file could say:

As you can see, the <properties> element is useful not only to give several properties a name, but also to define a multicolumn unique constraint or to make several properties immutable. For the association mappings, the order of columns is again important:

It s important to note that in the case of a dependency like Struts, there is more to it than its single JAR file. While overriding the struts.jar property could be handy, care must be taken because our web application build file not only uses the struts.jar property, it uses struts.dist.dir to get at other pieces such as tag library descriptor (TLD) files. In order to override the full directory of a Struts installation, you should really set struts.dir; the other properties will be adjusted accordingly by default. Controlling properties for a single build As we discussed in chapter 3, a property takes on the first value that sets it, and is immutable from then on. The first possible place that a property can be set is from the command line. Why would we want to do such a thing Suppose the Lucene team releases a new version of Lucene. Before upgrading our source code repository to rely on the new version, potentially breaking everyone s builds, we want to ensure that our code compiles, and our tests run successfully. We would install the new library in a directory of our choosing, probably under our standard lib directory using its unique version-labeled directory. From the command line we run:

<class name="Item" table="ITEM"> <id name="id" column="ITEM_ID">...</id> <many-to-one name="seller" property-ref="nameAndBirthday"> <column name="SELLER_FIRSTNAME"/> <column name="SELLER_LASTNAME"/> <column name="SELLER_BIRTHDAY"/> </many-to-one> </class>

If we had not installed the new version under our lib directory, we could instead override lucene.dir, or even lucene.jar. Using a different set of dependencies This is by far on the extreme edge of use cases, but with the property mappings we have created, it is possible even to point lib.dir at a different directory altogether. This would have the effect of shifting all dependencies to that directory tree, unless HANDLING VERSIONED DEPENDENCIES 199

By default, all class names are automatically imported into the namespace of the Hibernate query language, HQL. In other words, you can use the short class names without a package prefix in HQL, which is convenient. However, this autoimport can be turned off if two classes with the same name exist for a given SessionFactory, maybe in different packages of the domain model. If such a conflict exists, and you don t change the default settings, Hibernate won t know which class you re referring to in HQL. You can turn off auto-import

of names into the HQL namespace for particular mapping files with the autoimport="false" setting on the <hibernate-mapping> root element. Entity names can also be imported explicitly into the HQL namespace. You can even import classes and interfaces that aren t explicitly mapped, so a short name can be used in polymorphic HQL queries:

otherwise individually overridden. The main idea to take away from these examples is that by making logically organized hierarchical properties that are constructed from one another, entire directory trees can be redirected easily.

<hibernate-mapping> <import class="auction.model.Auditable" rename="IAuditable"/> </hibernate-mapping>

automate it all Crafting an interactive build process lends itself directly (and without much additional effort) to waking up in the morning with an e-mail informing you that your system built successfully overnight, or having a build run on an integration server immediately upon code being committed to the source code repository. We show how to set up a continuous integration system with Ant in chapter 16.