Package net.sf.saxon.expr.instruct

Class NamespaceConstructor

    • Constructor Detail

      • NamespaceConstructor

        public NamespaceConstructor​(Expression name)
        Create an xsl:namespace instruction for dynamic construction of namespace nodes
        Parameters:
        name - the expression to evaluate the name of the node (that is, the prefix)

    • Method Detail

      • setNameExp

        public void setNameExp​(Expression nameExp)

      • operands

        public java.lang.Iterable<Operand> operands()
        Description copied from class: Expression
        Get the immediate sub-expressions of this expression, with information about the relationship of each expression to its parent expression.

        If the expression is a Callable, then it is required that the order of the operands returned by this function is the same as the order of arguments supplied to the corresponding call() method.

        Overrides:
        operands in class SimpleNodeConstructor
        Returns:
        an iterator containing the sub-expressions of this expression

      • getInstructionNameCode

        public int getInstructionNameCode()
        Set the name of this instruction for diagnostic and tracing purposes
        Overrides:
        getInstructionNameCode in class Instruction
        Returns:
        a code identifying the instruction: typically but not always the fingerprint of a name in the XSLT namespace

      • getItemType

        public ItemType getItemType()
        Description copied from class: Instruction
        Get the item type of the items returned by evaluating this instruction
        Overrides:
        getItemType in class Instruction
        Returns:
        the static item type of the instruction

      • getCardinality

        public int getCardinality()
        Description copied from class: Expression
        Determine the static cardinality of the expression. This establishes how many items there will be in the result of the expression, at compile time (i.e., without actually evaluating the result.
        Overrides:
        getCardinality in class Expression
        Returns:
        one of the values Cardinality.ONE_OR_MORE, Cardinality.ZERO_OR_MORE, Cardinality.EXACTLY_ONE, Cardinality.ZERO_OR_ONE, Cardinality.EMPTY. This default implementation returns ZERO_OR_MORE (which effectively gives no information).

      • copy

        public Expression copy​(RebindingMap rebindings)
        Copy an expression. This makes a deep copy.
        Specified by:
        copy in class Expression
        Parameters:
        rebindings - the rebinding map
        Returns:
        the copy of the original expression

      • evaluateNodeName

        public NodeName evaluateNodeName​(XPathContext context)
                          throws XPathException
        Description copied from class: SimpleNodeConstructor
        Run-time method to compute the name of the node being constructed. This is overridden for nodes that have a name. The default implementation returns -1, which is suitable for unnamed nodes such as comments
        Overrides:
        evaluateNodeName in class SimpleNodeConstructor
        Parameters:
        context - the XPath dynamic evaluation context
        Returns:
        the name pool nameCode identifying the name of the constructed node
        Throws:
        XPathException - if any failure occurs

      • evaluateItem

        public NodeInfo evaluateItem​(XPathContext context)
                      throws XPathException
        Evaluate as an expression. We rely on the fact that when these instructions are generated by XQuery, there will always be a valueExpression to evaluate the content
        Overrides:
        evaluateItem in class SimpleNodeConstructor
        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

      • export

        public void export​(ExpressionPresenter out)
            throws XPathException
        Diagnostic print of expression structure. The abstract expression tree is written to the supplied output destination.
        Specified by:
        export in interface ExportAgent
        Specified by:
        export in class Expression
        Parameters:
        out - the expression presenter used to display the structure
        Throws:
        XPathException - if the export fails, for example if an expression is found that won't work in the target environment.