Class QuerySimpleContentConstructor

All Implemented Interfaces:
Serializable, SourceLocator, Container, Expression, InstructionInfoProvider

public class QuerySimpleContentConstructor extends SimpleContentConstructor
This class implements the rules for an XQuery simple content constructor, which are used in constructing the string value of an attribute node, text node, comment node, etc, from the value of the select expression or the contained sequence constructor. These differ slightly from the XSLT rules implemented in the superclass - specifically, the sequence is simply atomized, whereas XSLT takes special steps to concatenate adjacent text nodes before inserting separators.
See Also:
  • Field Details

    • noNodeIfEmpty

      boolean noNodeIfEmpty
  • Constructor Details

    • QuerySimpleContentConstructor

      public QuerySimpleContentConstructor(Expression select, Expression separator, boolean noNodeIfEmpty)
  • Method Details

    • computeCardinality

      protected int computeCardinality()
      Compute the cardinality of the result of the expression.
      Overrides:
      computeCardinality in class SimpleContentConstructor
      Returns:
      the cardinality, @link {StaticProperty.EXACTLY_ONE}
    • expandChildren

      public CharSequence expandChildren(XPathContext context) throws XPathException
      Expand the stylesheet elements subordinate to this one, returning the result as a string. The expansion must not generate any element or attribute nodes.
      Parameters:
      context - The dynamic context for the transformation
      Throws:
      XPathException
    • evaluateItem

      public Item evaluateItem(XPathContext context) throws XPathException
      Evaluate an expression as a single item. This always returns either a single Item or null (denoting the empty sequence). No conversion is done. This method should not be used unless the static type of the expression is a subtype of "item" or "item?": that is, it should not be called if the expression may return a sequence. There is no guarantee that this condition will be detected.
      Specified by:
      evaluateItem in interface Expression
      Overrides:
      evaluateItem in class SimpleContentConstructor
      Parameters:
      context - 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