Module com.darkcollective.relix.ast
Package com.darkcollective.relix.ast

Record Class RecursiveRefNode

java.lang.Object
java.lang.Record
com.darkcollective.relix.ast.RecursiveRefNode
Record Components:
name - the referenced bound recursive relation name; must not be blank
location - the source location of this node; never null
All Implemented Interfaces:
RelNode
public record RecursiveRefNode(String name, SourceLocation location) extends Record implements RelNode
An occurrence of a FIX-bound recursive relation name inside the body of its enclosing FixpointNode.

This is a dedicated leaf — not an overloaded RelationNode — for the recursive reference. The parser resolves a bound name to a RecursiveRefNode at parse time (it tracks a stack of in-scope binder names), so the recursive name never enters the symbol table and symbol resolution stays unambiguous: a RecursiveRefNode resolves to "the relation accumulated so far by the enclosing FixpointNode", whose schema is the fixpoint's base schema (supplied by inference in the semantics slice). It carries no children; like a base relation it materialises a stream.

By construction a RecursiveRefNode only ever appears within a FixpointNode's step; one outside any FIX scope is structurally impossible to produce from source.

  • Constructor Details

    • RecursiveRefNode

      public RecursiveRefNode(String name, SourceLocation location)
      Creates an instance of a RecursiveRefNode record class.
      Parameters:
      name - the value for the name record component
      location - the value for the location record component

    • RecursiveRefNode

      public RecursiveRefNode(String name)
      Convenience constructor for tests: SourceLocation.UNKNOWN.

  • Method Details

    • accept

      public <R> R accept(RelNodeVisitor<R> visitor)
      Specified by:
      accept in interface RelNode

    • toString

      public final String toString()
      Returns a string representation of this record class. The representation contains the name of the class, followed by the name and value of each of the record components.
      Specified by:
      toString in class Record
      Returns:
      a string representation of this object

    • hashCode

      public final int hashCode()
      Returns a hash code value for this object. The value is derived from the hash code of each of the record components.
      Specified by:
      hashCode in class Record
      Returns:
      a hash code value for this object

    • equals

      public final boolean equals(Object o)
      Indicates whether some other object is "equal to" this one. The objects are equal if the other object is of the same class and if all the record components are equal. All components in this record class are compared with Objects::equals(Object,Object).
      Specified by:
      equals in class Record
      Parameters:
      o - the object with which to compare
      Returns:
      true if this object is the same as the o argument; false otherwise.

    • name

      public String name()
      Returns the value of the name record component.
      Returns:
      the value of the name record component

    • location

      public SourceLocation location()
      Returns the value of the location record component.
      Specified by:
      location in interface RelNode
      Returns:
      the value of the location record component