Class IsLastExpression

java.lang.Object
com.icl.saxon.expr.Expression
com.icl.saxon.expr.IsLastExpression
public final class IsLastExpression extends Expression
position()=last() expression

  • Constructor Details

    • IsLastExpression

      public IsLastExpression(boolean condition)
      Construct a condition that tests position()=last (if condition is true) or position()!=last() (if condition is false).

  • Method Details

    • getCondition

      public boolean getCondition()

    • simplify

      public Expression simplify()
      Description copied from class: Expression
      Simplify an expression. Default implementation does nothing.
      Overrides:
      simplify in class Expression
      Returns:
      the simplified expression

    • evaluate

      public Value evaluate(Context c) throws XPathException
      Description copied from class: Expression
      Evaluate an expression.
      Specified by:
      evaluate in class Expression
      Parameters:
      c - The context in which the expression is to be evaluated
      Returns:
      the value of the expression, evaluated in the current context
      Throws:
      XPathException

    • evaluateAsBoolean

      public boolean evaluateAsBoolean(Context c) throws XPathException
      Description copied from class: Expression
      Evaluate an expression as a Boolean.
      The result of x.evaluateAsBoolean(c) must be equivalent to x.evaluate(c).asBoolean(); but optimisations are possible when it is known that a boolean result is required, especially in the case of a NodeSet.
      Overrides:
      evaluateAsBoolean in class Expression
      Parameters:
      c - The context in which the expression is to be evaluated
      Returns:
      the value of the expression, evaluated in the current context
      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 of this expression on the context
      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

    • display

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