Class CodepointsToString

All Implemented Interfaces:
Serializable, SourceLocator, LocationProvider, SaxonLocator, EvaluableItem, SequenceIterable, InstructionInfo, Locator

public class CodepointsToString extends SystemFunction
This class supports the function codepoints-to-string
See Also:
  • Constructor Details

    • CodepointsToString

      public CodepointsToString()
  • Method Details

    • preEvaluate

      public Expression preEvaluate(ExpressionVisitor visitor) throws XPathException
      Pre-evaluate a function at compile time. Functions that do not allow pre-evaluation, or that need access to context information, can override this method.
      Overrides:
      preEvaluate in class FunctionCall
      Parameters:
      visitor - an expression visitor
      Returns:
      the result of the early evaluation, or the original expression, or potentially a simplified expression
      Throws:
      XPathException
    • evaluateItem

      public Item evaluateItem(XPathContext c) throws XPathException
      Evaluate
      Specified by:
      evaluateItem in interface EvaluableItem
      Overrides:
      evaluateItem in class Expression
      Parameters:
      c - The context in which the expression is to be evaluated
      Returns:
      the node or atomic value that results from evaluating the expression; or null to indicate that the result is an empty sequence
      Throws:
      XPathException - if any dynamic error occurs evaluating the expression
    • unicodeToString

      public static CharSequence unicodeToString(SequenceIterator chars, XPathContext context) throws XPathException
      Return the Unicode string corresponding to a given sequence of Unicode code values
      Parameters:
      chars - iterator delivering the characters as integer values
      context - the evaluation context
      Throws:
      XPathException - if any of the integers is not the codepoint of a valid XML character