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

Record Class PatternPredicate

java.lang.Object
java.lang.Record
com.darkcollective.relix.ast.PatternPredicate
Record Components:
operand - the expression whose string value is tested; must not be null
pattern - the LIKE pattern string literal; must not be null
negated - true for NOT LIKE, false for LIKE
location - the source location of this predicate; never null
All Implemented Interfaces:
Predicate
public record PatternPredicate(Operand operand, Operand pattern, boolean negated, SourceLocation location) extends Record implements Predicate
Represents a pattern-matching predicate: operand LIKE pattern or operand NOT LIKE pattern.

The LIKE pattern uses SQL wildcard syntax:

  • % — matches any sequence of zero or more characters.
  • _ — matches exactly one character.
  • All other characters — match literally (case-sensitive).

Examples: 

   σ name LIKE "%smith%" (Users)
   σ email NOT LIKE "%@example.com" (Users)

  • Constructor Details

    • PatternPredicate

      public PatternPredicate(Operand operand, Operand pattern, boolean negated, SourceLocation location)
      Creates an instance of a PatternPredicate record class.
      Parameters:
      operand - the value for the operand record component
      pattern - the value for the pattern record component
      negated - the value for the negated record component
      location - the value for the location record component

    • PatternPredicate

      public PatternPredicate(Operand operand, Operand pattern, boolean negated)
      Convenience constructor for tests; uses SourceLocation.UNKNOWN.

  • Method Details

    • accept

      public <R> R accept(PredicateVisitor<R> visitor)
      Specified by:
      accept in interface Predicate

    • 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. Reference components are compared with Objects::equals(Object,Object); primitive components are compared with '=='.
      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.

    • operand

      public Operand operand()
      Returns the value of the operand record component.
      Returns:
      the value of the operand record component

    • pattern

      public Operand pattern()
      Returns the value of the pattern record component.
      Returns:
      the value of the pattern record component

    • negated

      public boolean negated()
      Returns the value of the negated record component.
      Returns:
      the value of the negated record component

    • location

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