EQL Internals

Modifying / Extending EQL

Refer to the javadoc of package ua.com.fielden.platform.eql in platform-dao.

Transformation of EQL expressions

EQL expression (fluent API)
        |
        | Collect tokens
        |
        v
      Tokens
        |
        | Stage 0: Parsing
        |
        v
  AST level 1
        |
        | Stage 1
        |
        v
  AST level 2
        |
        | Stage 2
        |
        v
  AST level 3
        |
        | Stage 3
        |
        v
       SQL

Discussion

• Parameterised entities
• Built-in conditioning
• Entity specific user-data-filtering
• Yielding of value type properties