APPENDIX B n HIBERNATE TOOLS 295 n HIBERNATE TOOLS 295 nNote Earlier versions of Hibernate Tools used the Velocity template language instead of FreeMarker, but in other respects, they behaved in the same way. If the existing exporters do not meet your needs, you can specify your own additional code generation tasks using the task. Table B-11 shows the attributes that can be supplied to this task. Table B-11. The Properties Available to the Exporter Element Property Default Description destdir If set, overrides, for this exporter only, the destination directory specified on the Hibernate tool task. exporterclass Specifies a class to use to generate output. It will be invoked once only, and the configuration object, output directory, template path and prefix, and any configuration properties will be passed into it. filepattern When using templates, represents the FreeMarker macro that should be used to determine the file name for the entity being processed. template Specifies the template to use to generate output. It will be invoked for each of the entities in the configuration metamodel. templatepath Specifies the path from which your template(s) will be loaded, overriding any default location. templateprefix Specifies an optional prefix to your template file name within the template path. It is set by the standard tasks, so overriding this allows you to import your own tasks instead. Again, you have two options when carrying out this process. You can set the exporterclass attribute to the name of the class to be used to carry out the export process. This class must implement the org.hibernate.tool.hbm2x.Exporterinterface. This is passed a reference to the current configuration object and any other attributes that were set on the task. Alternatively, you can specify the name of a FreeMarker template to be used in processing the configuration object and the name of a prefix. Note that filepattern contains FreeMarker macros that will be expanded at run time to determine the appropriate file names for the tool s output. The task will search for this file on the classpath, and then as a file resource. If the configuration object does not contain some of the information that you need in order to produce the desired output, you can also specify additional arbitrary details using a standard Ant property or property set. Here s an example:
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