Package opendap.servers

Interface Clause

All Known Subinterfaces:
SubClause, TopLevelClause
All Known Implementing Classes:
AbstractClause, BoolFunctionClause, BTFunctionClause, DereferenceClause, RelOpClause, ValueClause
public interface Clause
Represents the common interface of the two types of clause used by the constraint expression (CE) parser: TopLevelClause and SubClause. See these interfaces for more about CE parsing and evaluation.

  • Method Summary

    Modifier and Type
    Method
    Description
    List
    getChildren()
    Returns an ordered list of this clause's sub-clauses.
    boolean
    isConstant()
    A clause is considered "constant" iff it and its subclauses do not refer to data values from the dataset being constrained.
    boolean
    isDefined()
    Returns whether or not the clause has a defined value.
    void
    printConstraint(PrintWriter os)
    Dump clause as in constraint form

  • Method Details

    • getChildren

      List getChildren()
      Returns an ordered list of this clause's sub-clauses. If the clause has no sub-clauses, an empty list will be returned.

    • isConstant

      boolean isConstant()
      A clause is considered "constant" iff it and its subclauses do not refer to data values from the dataset being constrained. A constant clause is defined as soon as it is created, and is guaranteed not to change its value during its lifetime.

    • isDefined

      boolean isDefined()
      Returns whether or not the clause has a defined value. Non-constant clauses do not have a defined value until they are evaluated for the first time. Methods for evaluating are found in the TopLevelClause and SubClause interfaces.

    • printConstraint

      void printConstraint(PrintWriter os)
      Dump clause as in constraint form