More Detail:

• NRL Rule Editor
• Mapping Editor
• Component Overview

NRL Java Generator

This generator is a key component in the framework: it translates NRL rule files to plain Java code. The generated Java code has no runtime engine dependency - it implements simple interfaces that are imported into user projects and can be called directly.


Features provided by the generator include:

• Supports both the NRL constraint and action language - suitable for validation, enrichment or mapping
• Generates clean code without strange variable names or spurious constructs
• Reconciles the way classes / XML Schema types are named/represented in the model with runtime class representations (e.g. JAXB)
• API conventions (get/set methods, class names, collection types) are not hard-coded, but dynamically configurable using a Groovy script
• Automatically inserts type conversions so the rule writer does not have to:
• Date syntax transformations are delegated to user-supplied classes - the rule writer can compare or assign dates in completely different representations
• Type casts and number parsing code automatically generated
• A simple runtime framework that executes rules and collects result is copied in source code form to user projects - user projects remain independent of NRL
• Optional tracing code is inserted to relate crashes to line/column of the last executed NRL statement
• Optimises checks against static lists using hash maps

Requirements and deployment:

• Java 1.5+ is required for the user interface
• Generated Java code is Java 1.4 compliant; Java 1.5 features can be generated on request