Class CallTemplate

    • Constructor Detail

      • CallTemplate

        public CallTemplate​(Template template,
                            boolean useTailRecursion,
                            Expression calledTemplateExpression,
                            NamespaceResolver nsContext)
        Construct a CallTemplate instruction.
        Parameters:
        template - the Template object identifying the template to be called, in the normal case where this is known statically
        useTailRecursion - true if the call is potentially tail recursive
        calledTemplateExpression - expression to calculate the name of the template to be called at run-time, this supports the saxon:allow-avt option
        nsContext - the static namespace context of the instruction, needed only in the case where the name of the called template is to be calculated dynamically
    • Method Detail

      • getCalledTemplateExpression

        public Expression getCalledTemplateExpression()
      • setActualParameters

        public void setActualParameters​(WithParam[] actualParams,
                                        WithParam[] tunnelParams)
        Set the actual parameters on the call
        Parameters:
        actualParams - the parameters that are not tunnel parameters
        tunnelParams - the tunnel parameters
      • getActualParams

        public WithParam[] getActualParams()
        Get the actual parameters passed to the called template
        Specified by:
        getActualParams in interface ITemplateCall
        Returns:
        the non-tunnel parameters
      • getTunnelParams

        public WithParam[] getTunnelParams()
        Get the tunnel parameters passed to the called template
        Specified by:
        getTunnelParams in interface ITemplateCall
        Returns:
        the tunnel parameters
      • getTargetTemplate

        public Template getTargetTemplate()
        Get the target template, if known statically
        Returns:
        the target template
      • usesTailRecursion

        public boolean usesTailRecursion()
        Ask whether this is a tail call
        Returns:
        true if this is a tail call
      • getInstructionNameCode

        public int getInstructionNameCode()
        Return the name of this instruction.
        Overrides:
        getInstructionNameCode in class Instruction
        Returns:
        a code identifying the instruction: typically but not always the fingerprint of a name in the XSLT namespace
      • simplify

        public Expression simplify​(ExpressionVisitor visitor)
                            throws XPathException
        Simplify an expression. This performs any static optimization (by rewriting the expression as a different expression).
        Specified by:
        simplify in class Instruction
        Parameters:
        visitor - an expression visitor
        Returns:
        the simplified expression
        Throws:
        XPathException - if an error is discovered during expression rewriting
      • typeCheck

        public Expression typeCheck​(ExpressionVisitor visitor,
                                    ExpressionVisitor.ContextItemType contextItemType)
                             throws XPathException
        Description copied from class: Expression
        Perform type checking of an expression and its subexpressions. This is the second phase of static optimization.

        This checks statically that the operands of the expression have the correct type; if necessary it generates code to do run-time type checking or type conversion. A static type error is reported only if execution cannot possibly succeed, that is, if a run-time type error is inevitable. The call may return a modified form of the expression.

        This method is called after all references to functions and variables have been resolved to the declaration of the function or variable. However, the types of such functions and variables may not be accurately known if they have not been explicitly declared.

        If the implementation returns a value other than "this", then it is required to ensure that the location information in the returned expression have been set up correctly. It should not rely on the caller to do this, although for historical reasons many callers do so.

        Overrides:
        typeCheck in class Expression
        Parameters:
        visitor - an expression visitor
        contextItemType - 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 to perform necessary run-time type checks, and to perform other type-related optimizations
        Throws:
        XPathException - if an error is discovered during this phase (typically a type error)
      • optimize

        public Expression optimize​(ExpressionVisitor visitor,
                                   ExpressionVisitor.ContextItemType contextItemType)
                            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 Expression
        Parameters:
        visitor - an expression visitor
        contextItemType - 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)
      • computeCardinality

        public int computeCardinality()
        Get the cardinality of the sequence returned by evaluating this instruction
        Overrides:
        computeCardinality in class Instruction
        Returns:
        the static cardinality
      • getItemType

        public ItemType getItemType​(TypeHierarchy th)
        Get the item type of the items returned by evaluating this instruction
        Overrides:
        getItemType in class Instruction
        Parameters:
        th - the type hierarchy cache
        Returns:
        the static item type of the instruction
      • copy

        public Expression copy()
        Copy an expression. This makes a deep copy.
        Specified by:
        copy in class Expression
        Returns:
        the copy of the original expression
      • getIntrinsicDependencies

        public int getIntrinsicDependencies()
        Description copied from class: Expression
        Determine the intrinsic dependencies of an expression, that is, those which are not derived from the dependencies of its subexpressions. For example, position() has an intrinsic dependency on the context position, while (position()+1) does not. The default implementation of the method returns 0, indicating "no dependencies".
        Overrides:
        getIntrinsicDependencies in class Expression
        Returns:
        a set of bit-significant flags identifying the "intrinsic" dependencies. The flags are documented in class net.sf.saxon.value.StaticProperty
      • createsNewNodes

        public final boolean createsNewNodes()
        Determine whether this instruction creates new nodes. This implementation currently returns true unconditionally.
        Overrides:
        createsNewNodes in class Instruction
        Returns:
        true if the instruction creates new nodes (or if it can't be proved that it doesn't)
      • iterateSubExpressions

        public java.util.Iterator<Expression> iterateSubExpressions()
        Get all the XPath expressions associated with this instruction (in XSLT terms, the expression present on attributes of the instruction, as distinct from the child instructions in a sequence construction)
        Overrides:
        iterateSubExpressions in class Expression
        Returns:
        an iterator containing the sub-expressions of this expression
      • replaceSubExpression

        public boolean replaceSubExpression​(Expression original,
                                            Expression replacement)
        Replace one subexpression by a replacement subexpression
        Overrides:
        replaceSubExpression in class Expression
        Parameters:
        original - the original subexpression
        replacement - the replacement subexpression
        Returns:
        true if the original subexpression is found
      • process

        public void process​(XPathContext context)
                     throws XPathException
        Process this instruction, without leaving any tail calls.
        Overrides:
        process in class Instruction
        Parameters:
        context - the dynamic context for this transformation
        Throws:
        XPathException - if a dynamic error occurs
      • processLeavingTail

        public TailCall processLeavingTail​(XPathContext context)
                                    throws XPathException
        Process this instruction. If the called template contains a tail call (which may be an xsl:call-template of xsl:apply-templates instruction) then the tail call will not actually be evaluated, but will be returned in a TailCall object for the caller to execute.
        Specified by:
        processLeavingTail in interface TailCallReturner
        Specified by:
        processLeavingTail in class Instruction
        Parameters:
        context - the dynamic context for this transformation
        Returns:
        an object containing information about the tail call to be executed by the caller. Returns null if there is no tail call.
        Throws:
        XPathException - if a dynamic error occurs during the evaluation of the instruction
      • getTargetTemplate

        public Template getTargetTemplate​(XPathContext context)
                                   throws XPathException
        Get the template, in the case where it is specified dynamically.
        Parameters:
        context - The dynamic context of the transformation
        Returns:
        The template to be called
        Throws:
        XPathException - if a dynamic error occurs: specifically, if the template name is computed at run-time (Saxon extension) and the name is invalid or does not reference a known template
      • getObjectName

        public StructuredQName getObjectName()
        Description copied from interface: InstructionInfo
        Get a name identifying the object of the expression, for example a function name, template name, variable name, key name, element name, etc. This is used only where the name is known statically.
        Specified by:
        getObjectName in interface InstructionInfo
        Overrides:
        getObjectName in class Expression
        Returns:
        the QName of the object declared or manipulated by this instruction or expression
      • explain

        public void explain​(ExpressionPresenter out)
        Diagnostic print of expression structure. The abstract expression tree is written to the supplied output destination.
        Specified by:
        explain in class Expression
        Parameters:
        out - the expression presenter used to display the structure