Class MultithreadedForEach

    • Constructor Detail

    • Method Detail

      • isMultiThreaded

        public boolean isMultiThreaded​(Configuration config)
        Description copied from class: Expression
        Ask whether the expression is multithreaded (that is, whether its operands are evaluated in parallel)
        Overrides:
        isMultiThreaded in class Expression
        Parameters:
        config - the Saxon configuration
        Returns:
        true if execution will be multithreaded
      • optimize

        public Expression optimize​(ExpressionVisitor visitor,
                                   ContextItemStaticInfo contextInfo)
                            throws XPathException
        Description copied from class: Expression
        Perform optimisation of an expression and its subexpressions. This is the third and final phase of static optimization.

        This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.

        Overrides:
        optimize in class ForEach
        Parameters:
        visitor - an expression visitor
        contextInfo - the static type of "." at the point where this expression is invoked. The parameter is set to null if it is known statically that the context item will be undefined. If the type of the context item is not known statically, the argument is set to Type.ITEM_TYPE
        Returns:
        the original expression, rewritten if appropriate to optimize execution
        Throws:
        XPathException - if an error is discovered during this phase (typically a type error)
      • copy

        public Expression copy​(RebindingMap rebindings)
        Description copied from class: ForEach
        Copy an expression. This makes a deep copy.
        Overrides:
        copy in class ForEach
        Parameters:
        rebindings - variables that need to be re-bound
        Returns:
        the copy of the original expression
      • processLeavingTail

        public TailCall processLeavingTail​(Outputter output,
                                           XPathContext context)
                                    throws XPathException
        Description copied from class: Instruction
        ProcessLeavingTail: called to do the real work of this instruction. This method must be implemented in each subclass. The results of the instruction are written to the current Receiver, which can be obtained via the Controller.
        Specified by:
        processLeavingTail in interface TailCallReturner
        Overrides:
        processLeavingTail in class ForEach
        Parameters:
        output - the destination for the result
        context - The dynamic context of the transformation, giving access to the current node, the current variables, etc.
        Returns:
        null if the instruction has completed execution; or a TailCall indicating a function call or template call that is delegated to the caller, to be made after the stack has been unwound so as to save stack space.
        Throws:
        XPathException - if a dynamic error occurs during the evaluation of the instruction
      • iterate

        public SequenceIterator iterate​(XPathContext context)
                                 throws XPathException
        Return an Iterator to iterate over the values of the sequence.
        Overrides:
        iterate in class ForEach
        Parameters:
        context - supplies the context for evaluation
        Returns:
        a SequenceIterator that can be used to iterate over the result of the expression
        Throws:
        XPathException - if any dynamic error occurs evaluating the expression
      • getExpressionName

        public java.lang.String getExpressionName()
        Get a name identifying the kind of expression, in terms meaningful to a user.
        Overrides:
        getExpressionName in class ForEach
        Returns:
        a name identifying the kind of expression, in terms meaningful to a user. The name will always be in the form of a lexical XML QName, and should match the name used in explain() output displaying the expression.