Class ErrorExpression

java.lang.Object
com.icl.saxon.expr.Expression
com.icl.saxon.expr.ErrorExpression
public class ErrorExpression extends Expression
Error expression: this expression is generated when the supplied expression cannot be parsed, and the containing element enables forwards-compatible processing. It defers the generation of an error message until an attempt is made to evaluate the expression

  • Constructor Details

    • ErrorExpression

      public ErrorExpression(XPathException exception)
      Constructor
      Parameters:
      exception - the error found when parsing this expression

  • Method Details

    • evaluate

      public Value evaluate(Context c) throws XPathException
      Evaluate this expression. This always throws the exception registered when the expression was first parsed.
      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

    • getDataType

      public int getDataType()
      Determine the data type of the expression, if possible
      Specified by:
      getDataType in class Expression
      Returns:
      Value.ANY (meaning not known in advance)

    • getDependencies

      public int getDependencies()
      Determine which aspects of the context the expression depends on. The result is a bitwise-or'ed value composed from constants such as Context.VARIABLES and Context.CURRENT_NODE
      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