Template-Based Code Generation with Apache Velocity, Part 2
As described in part one of this series, code generation typically uses a template engine to transform some kind of "model" into compilable code, given the formatting specified by a template.
Tutorial Details:
In this second part of the series, I will show how to use Velocity inside of a code generator that is based on a well-defined Internal Object Model (IOM). You will see two different strategies:
1. Using the Internal Object Model as the data model for the Velocity transformation.
2. Using a Platform-Specific Model (PSM) in order to balance the logic between generator and template.
You can see three different modules in the code generator:
1. Importer: Reads the data model as input and translates it into a platform-independent internal format based on an object model.
2. Internal Object Model: Is the platform-independent internal format and could be considered the core of the code-generator architecture. IOM contains a set of classes that make it easy to manipulate the information coming from the model to generate outputs. The structure of the object model is a very important issue -- when well designed, it can be a powerful representation, independent of the target technology (Java, C++, etc.), that can easily be converted into source code.
3. Exporter: Accesses the IOM and takes the relevant information to generate code. As we will see, it can use templates in order to drive the generation process.
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