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

Record Class NullPredicate

java.lang.Object
java.lang.Record
com.darkcollective.relix.ast.NullPredicate
Record Components:
operand - the operand to test for null; must not be null
isNull - true for IS NULL, false for IS NOT NULL
location - the source location of this predicate; never null
All Implemented Interfaces:
Predicate
public record NullPredicate(Operand operand, boolean isNull, SourceLocation location) extends Record implements Predicate
Represents a null predicate (IS NULL or IS NOT NULL) in relational algebra. attribute = ⊥ represents IS NULL attribute ≠ ⊥ represents IS NOT NULL

  • Constructor Details

    • NullPredicate

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

    • NullPredicate

      public NullPredicate(Operand operand, boolean isNull)
      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

    • isNull

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