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Wiki: Templated Code Generation Design

Revision 7 as of 2011-09-05 20:12:53 -0700

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The purpose of the Code Generation project is to provide users with a means for generating code in an easily customizable fashion. The form that code takes within a company is often standardized, and ArgoUML must be able to support the generation of code that meets a customizable coding standard.

Use Cases

Use Case Diagram

  • [[?UseCaseDiagram.png|Figure 1 - Use Case Diagram]]

Specify class header

  • The user should be able to specify a default header that can be set either as a system default, or on a project-by-project basis. The template will automatically be injected into the class when it's generated.

Clone Template Pack

  • The user will be able to clone a template pack to a local or remote directory (i.e. WebDAV, S/FTP server, etc). The template pack is a zip file containing all of the templates and any associated metadata.

Share Template

  • The form that code takes is often standardized within a company according to its coding standards. The user will be able to share their templates, and use a standardized templates found in a template repository.

Specify Template Repository

  • The user will be able to specify a template repository. This may be a remote repository such as a WebDAV, or FTP server. The system will automatically scan the directory for templates prior to code generation.

Modify Templates in Template Pack

  • The user should be able to modify any template in a template pack. The system should have a built-in editor to allow the user to edit the contents of the template in addition to the template metadata.

Modify Template

  • The user will be able to modify the text of the code template itself via a built-in editor.

Modify Template Metadata

  • The user will be able to edit template metadata. This metadata may include a filenaming convention specified as a template (for example "${projectRoot}/src/main/java/${package}/${classname}.java")

Modify Template Pack Metadata

  • The user will be able to modify the Template Pack's metadata. These parameters will include any stereotype-dependent directory locations. This will allow the user who is generating Grails or Spring projects (for example) to generate classes and artifacts in specific directories.

Generate Code

  • The user should be able to generate code. The user will be able to select a template pack and any subset of classes, and generate code from their selections.

Generate Code For Diagram

  • The user should be able to generate code for all classes in a given diagram. It may be useful at some point in the future to be able to generate configuration files (like Maven POM files, and Manifest files) from a deployment diagram.

Generate Code For Package

  • The user will be able to generate code for a particular package.

Generate Code For Project

  • The user should be able to generate code for all classes in the project.

Generate Language-Specific Elements

Generate Test Cases:

  • The user will be able to generate test cases for any subset of the project specified in the Generate Code use case.


Class Diagram

  • [[File:ClassDiagram.png|Figure 2 - Class Diagram]]


  • Implementations of this class are responsible for generating a project directory structure

{| |+ Methods |- ! Name ! Description |- | generateProject | This method creates the directory structure of the project, |- | addDirectoryTemplate | This method adds a directory template for the project. The directory template is used to create a directory within the project.


  • === ?CodeGenerator ===

  • This interface defines the methods needed to generate code using a template.
    • {|
    • |+ Methods |- ! Name ! Description
      • |-
      • | generate | This method generates classes or other artifacts from a diagram.
        • |-
        | getName | Gets the name of the code generator.
      • === ?CodeGeneratorMetaFile ===

      This class stores the metadata associated with a code generator.
      • {|
      |+Methods |- !Name !Description
      • |-
      • |getFileNamingTemplate |This method gets a file naming template used to create files.
        • |}

          === ?VelocityClassGenerator ===

      This class uses Velocity templates to generate classes.
      • === ?CodeGenerationUtil ===

      This class is similar to the ?DiagramUtil class in ?ArgoPrint and serves as a shim between the model and the template. It's purpose is to make it easier for template writers to access model elements in the class with simple one-line calls.

      • {|
      |+Methods |- !Name !Description
      • |-
      • |getClassesForDiagram |This method gets the classes for an individual diagram.
        • |-
        |getAnnotationsForClass |This method gets the annotation names for a class. This is useful if you have class-level annotations that you want to apply.
        • |-
        |overrides |This method indicates whether or not the method in a given class overrides the method from a superclass. This is used primarily to determine whether or not to generate an @Overrides annotation in Java.
        • |-
        |getAnnotationImportsForClass |This method gets the fully qualified import statements for the annotations used in the class.
        • |-
        |getNestedClasses |This method gets the nested classes (inner classes) for a given parent class.
        • |-
        |getClassesForPackage |This metho gets the class for a package.
        • |-
        |getClassesForProject |This method gets all classes found in a particular project.
        • |-
        |getAnnotationsForMethods |This method gets the annotations for a given method
        • |}

          === ?CodeGeneratorFactory ===

      This factory is responsible for creating instances of a code generator. It uses the Java SPI facility to register code generator implementations.
      • === ?TemplatePackMetaFile ===

      This class is used to manage the metadata associated wth a template pack. The pack is a zip file containing multiple templates.
      • === ?CodeGeneratorSerializer ===

      This class is responsible for reading/writing Code Generator Metadata Files. These metadata files contain configuration information used to generate code from templates.
      • === ?TemplatePackSerializer ===

      This class is responsible for reading/writing a template pack. Template packs are zip files which contain the metadata and associated template files.
      • === ?DefaultProjectGenerator ===

      This class is the default implementation of the project generator.
      • === ?ProjectGeneratorFactory ===

      This factory generates projects including directory structures.
      • === ?CodeGenManager ===

      This is the central class of the framework and is responsible for managing all aspects of code generation.