Java Emitter Templates (JET or JETemplate) are the starting point if you want to venture into code generation. It is also the easiest way to generate code. You can create your own templates. For how to do this please consult the articles provided in the reference section. The template can be added via the path on your system. If your template uses its own model or needs other helper classes you will have to supply them together with the template in a plugin extending the extension point ch.sahits.codegen.java.jettemplate
There are four categories of generators. Every generator must implement the interface IBaseGenerator. Each Generator has its own specific interface that needs to be implemented. For some classes there are also abstract classes that already implement a large part of the needed functionality.
For JETemplate with AST improvement your generator has to implement the interface IJETASTGenerator The abstract class AbstractJETASTGenerator provides a well founded basis. You have to implement the three methods: createJetGenerator() that provides the JETGateway for generation from the template, setBaseClass(String) that initializes the with JET generated base class and generateASTCode() that encapsules everything you want to generate with AST.
To generate a JETemplate your generator must implement the interfaces IGenerator and IJetCodeGenerator. Here the abstract class AbstractJETTemplateGenerator encapsueles almost everything. You have to fill in the methods addImports() for adding the needed import statements and generateTemplate() for the actual template generation.
To generate with AST from scratch you need to have a deeper knowledge of the inner working of AST. This can be gained through the resources in the further reading section. A generator must implement the interfaces IPureASTGenerator. Since almost everything is specific for this type of generator and there is no abstract class you have to implement it.
To generate a JETemplate with AST improvement your generator must implement the interfaces IASTGenerator, IJetCodeGenerator and IGeneratorInitializer. The class ASTGenerator can be used as a base class.
For a Reference Implementation your generator class must implement the interface IReferenceImpleCaller and may be a subclass of AbstractReferenceImplCaller. The reference implementation itself must implement IReferenceImplementation. For further details see the reference implementation documentation.
If you decide to get involved you want to check out the project.
Actually the project consists of four parts that you need to check out.
Go to File -> Import -> Other -> Checkout Project from SVN.
Select Create new repository location.
Supply the URL https://codegenjava.svn.sourceforge.net. Open the tree
and select the folder plugin to check out. Repeat this process (now you
can select the repository from the list)
The easiest way to retrieve the code is with a script that is available
for the
Windows and
Unix/Linux platforms.
The following is a list of plugins that are part of this project:
When you come to the conlusion to contribute to the project don't hesitate to contact me to gain committer rights.
Create more -- better -- code in Eclipse with JET A
good tutorial from IBM (Aug 2006)
JET Tutorial Part 1 (Introduction to JET) and JET Tutorial Part 2 (Write Code that Writes Code)
(Jul 2003) illustrating the way from a JET project to a plug-in.
How to create custom XPATH Function?
How to create custom tag?
JDT API Documentation
Abstract Syntax Tree Article
Manipulating Java Code
JDT fundamentals
YAAT - Yet another AST
tutorial
AST
Javadoc
Oracle Data Type (versions 7 - 9) and Oracle
Datatypes & Subtypes (version 11)
Create Table Syntax (version 10.2)
Create Index Syntax (version 10.2)
Metadata queries
Create Syntax for table for MySQL 5.0
Create Syntax for index for MySQL 5.0
Information Schema for MS Server 2000
Create Syntax for tables for MS SQL Server 2000
Create Syntax for tables for SQL Server 2000 (by Microsoft)
Create Syntax for index for SQL Server 2000 (by Microsoft)
Data Type definition
This Project is hosted at:
Last modified: