Module com.darkcollective.relix.ast

Package com.darkcollective.relix.ast.internal

Class OperandWalker

java.lang.Object

com.darkcollective.relix.ast.internal.OperandWalker

public final class OperandWalker
extends Object

A single, reusable structural walk over Operand expression trees (and the Predicate trees that contain them).

Several analyses each used to carry a near-identical switch that recursed the compound operands and differed only in their terminal action — the semantic validator's constant-argument / projected-operand / column-existence checks, and the processor's COVER factor-dependency collector. Centralising the recursion here gives every Operand/Predicate subtype a single registration point: when a new operand kind is added, only this walker needs the extra arm, and no caller can silently drop references inside it.

The walk recurses into every compound operand (BinaryArithmeticExpression, UnaryOperand, SetLiteralOperand, StructConstruction, ArrayConstruction, and a FunctionCall's arguments) and invokes:

• onAttribute for each AttributeOperand, and
• onFunction for each FunctionCall (the call's arguments are still walked).

Plain literals reference no columns and trigger no callback.

This module carries no dependencies beyond the JDK, so the walker is safe to reuse from any module that depends on the AST.

Method Summary

Modifier and Type	Method	Description
static void	walk(Operand expr, Consumer<AttributeOperand> onAttribute, Consumer<FunctionCall> onFunction)	Walks expr, invoking onAttribute for each attribute reference and onFunction for each function call.
static void	walk(Predicate predicate, Consumer<AttributeOperand> onAttribute, Consumer<FunctionCall> onFunction)	Walks every Operand reachable through predicate, recursing the predicate's logical structure and driving walk(Operand, Consumer, Consumer) at each leaf operand.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

walk

public static void walk(Operand expr,
 Consumer<AttributeOperand> onAttribute,
 Consumer<FunctionCall> onFunction)

Walks expr, invoking onAttribute for each attribute reference and onFunction for each function call. A function call's arguments are walked before onFunction fires, matching the argument-then-callee error ordering callers rely on.

walk

public static void walk(Predicate predicate,
 Consumer<AttributeOperand> onAttribute,
 Consumer<FunctionCall> onFunction)

Walks every Operand reachable through predicate, recursing the predicate's logical structure and driving walk(Operand, Consumer, Consumer) at each leaf operand. The callbacks fire with the same contract as the operand overload.