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For C#, I have often used CodeSmith and lately the T4 generator which is part of Visual Studio.
I'm looking for something similar for Java, in particular an Eclipse add-in since I do all my Java development using the Eclipse IDE.
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You can create a generator model with the YAKINDU Statechart generator model wizard by selecting File → New → Code generator model. The code generation is performed automatically whenever the statechart or the generator file is modified. See also chapter Running a generator for more information.
Template Method is a behavioral design pattern that allows you to defines a skeleton of an algorithm in a base class and let subclasses override the steps without changing the overall algorithm's structure.
FreeMarker is a Java-based template engine which can be used in stand-alone or servlet-based Java programs. In FreeMarker you define templates, which are text files that contain the desired output, except that they contain placeholders like ${name} , and even some logic like conditionals, loops, etc.
Apache FreeMarker™ is a template engine: a Java library to generate text output (HTML web pages, e-mails, configuration files, source code, etc.) based on templates and changing data.
I've found that freemarker does a pretty good job for generating any type of code. From the website:
FreeMarker is a "template engine"; a generic tool to generate text output (anything from HTML to autogenerated source code) based on templates. It's a Java package, a class library for Java programmers. It's not an application for end-users in itself, but something that programmers can embed into their products.
It is used by struts2 a lot. The website has a long list of other products that use freemarker.
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I have worked with both Velocity and StringTemplate. Velocity is a bit more conventional (think JSP/ASP concepts), while StringTemplate seems a bit cleaner. in a sense described in this Artima interview. Both are pure templating engines, and will require you to write some code around them, if you want to do full-blown code generation from a model.
StringTemplate is used internally by ANTLR, which may be useful to your effort.
As an alternative approach, you could go with Eclipse, using EMF and JET.
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