Class PositionRange

java.lang.Object
com.icl.saxon.expr.Expression
com.icl.saxon.expr.PositionRange
class PositionRange extends Expression
PositionRange: a boolean expression that tests whether the position() is within a certain range. This expression can occur in any context but it is optimized when it appears as a predicate (see FilterEnumerator)

  • Constructor Details

    • PositionRange

      public PositionRange(int min, int max)
      Create a position range

  • Method Details

    • simplify

      public Expression simplify() throws XPathException
      Simplify an expression
      Overrides:
      simplify in class Expression
      Returns:
      the simplified expression
      Throws:
      XPathException

    • evaluate

      public Value evaluate(Context c) throws XPathException
      Evaluate the expression in a given context
      Specified by:
      evaluate in class Expression
      Parameters:
      c - the given context for evaluation
      Returns:
      a BooleanValue representing the result of the numeric comparison of the two operands
      Throws:
      XPathException

    • evaluateAsBoolean

      public boolean evaluateAsBoolean(Context c) throws XPathException
      Evaluate the expression in a given context
      Overrides:
      evaluateAsBoolean in class Expression
      Parameters:
      c - the given context for evaluation
      Returns:
      a boolean representing the result of the numeric comparison of the two operands
      Throws:
      XPathException

    • getDataType

      public int getDataType()
      Determine the data type of the expression
      Specified by:
      getDataType in class Expression
      Returns:
      Value.BOOLEAN

    • getDependencies

      public int getDependencies()
      Get the dependencies
      Specified by:
      getDependencies in class Expression

    • reduce

      public Expression reduce(int dependencies, Context context) throws XPathException
      Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.
      Specified by:
      reduce in class Expression
      Parameters:
      dependencies - The dependencies to be removed
      context - The context to be used for the partial evaluation
      Returns:
      a new expression that does not have any of the specified dependencies
      Throws:
      XPathException

    • getMinPosition

      protected int getMinPosition()
      Get the minimum position

    • getMaxPosition

      protected int getMaxPosition()
      Get the maximum position

    • display

      public void display(int level)
      Diagnostic print of expression structure
      Specified by:
      display in class Expression