Class EarlyEvaluationContext

  • All Implemented Interfaces:
    XPathContext

    public class EarlyEvaluationContext
    extends java.lang.Object
    implements XPathContext
    This class is an implementation of XPathContext used when evaluating constant sub-expressions at compile time.
    • Constructor Detail

      • EarlyEvaluationContext

        public EarlyEvaluationContext​(Configuration config)
        Create an early evaluation context, used for evaluating constant expressions at compile time
        Parameters:
        config - the Saxon configuration //@param map the available collations
    • Method Detail

      • evaluateLocalVariable

        public Sequence evaluateLocalVariable​(int slotnumber)
        Get the value of a local variable, identified by its slot number
        Specified by:
        evaluateLocalVariable in interface XPathContext
        Parameters:
        slotnumber - the slot number allocated at compile time to the variable, which identifies its position within the local stack frame
        Returns:
        the value of the variable.
      • getCaller

        public XPathContext getCaller()
        Get the calling XPathContext (the next one down the stack). This will be null if unknown, or if the bottom of the stack has been reached.
        Specified by:
        getCaller in interface XPathContext
        Returns:
        the XPathContext of the calling expression
      • getResourceResolver

        public ResourceResolver getResourceResolver()
        Get the URI resolver. This gets the local URIResolver set in the XPathContext if there is one; if not, it gets the URIResolver from the Controller (which itself defaults to the one set in the Configuration).
        Specified by:
        getResourceResolver in interface XPathContext
        Returns:
        the user-supplied URI resolver if there is one, or null otherwise.
        Since:
        9.6
      • getErrorReporter

        public ErrorReporter getErrorReporter()
        Get the error listener. If no ErrorListener has been set locally, the ErrorListener in the Controller is returned; this in turn defaults to the ErrorListener set in the Configuration.
        Specified by:
        getErrorReporter in interface XPathContext
        Returns:
        the ErrorListener in use. This will always be an UnfailingErrorListener, which is a Saxon subclass of ErrorListener that throws no exceptions.
        Since:
        9.6
      • getContextItem

        public Item getContextItem()
        Get the context item
        Specified by:
        getContextItem in interface XPathContext
        Returns:
        the context item, or null if the context item is undefined
      • getController

        public Controller getController()
        Get the Controller. May return null when running outside XSLT or XQuery
        Specified by:
        getController in interface XPathContext
        Returns:
        the controller for this query or transformation
      • getCurrentGroupIterator

        public GroupIterator getCurrentGroupIterator()
        Get the current group iterator. This supports the current-group() and current-grouping-key() functions in XSLT 2.0
        Specified by:
        getCurrentGroupIterator in interface XPathContext
        Returns:
        the current grouped collection
      • getCurrentMergeGroupIterator

        public GroupIterator getCurrentMergeGroupIterator()
        Get the current merge group iterator. This supports the current-merge-group() and current-merge-key() functions in XSLT 3.0
        Specified by:
        getCurrentMergeGroupIterator in interface XPathContext
        Returns:
        the current grouped collection
      • getCurrentIterator

        public FocusTrackingIterator getCurrentIterator()
        Get the current iterator. This encapsulates the context item, context position, and context size.
        Specified by:
        getCurrentIterator in interface XPathContext
        Returns:
        the current iterator, or null if there is no current iterator (which means the context item, position, and size are undefined).
      • getCurrentRegexIterator

        public RegexIterator getCurrentRegexIterator()
        Get the current regex iterator. This supports the functionality of the regex-group() function in XSLT 2.0.
        Specified by:
        getCurrentRegexIterator in interface XPathContext
        Returns:
        the current regular expressions iterator
      • getCurrentTemplateRule

        public Rule getCurrentTemplateRule()
        Get the current template. This is used to support xsl:apply-imports
        Specified by:
        getCurrentTemplateRule in interface XPathContext
        Returns:
        the current template
      • getLocalParameters

        public ParameterSet getLocalParameters()
        Get the local (non-tunnel) parameters that were passed to the current function or template
        Specified by:
        getLocalParameters in interface XPathContext
        Returns:
        a ParameterSet containing the local parameters
      • getStackFrame

        public StackFrame getStackFrame()
        Get a reference to the local stack frame for variables. Note that it's the caller's job to make a local copy of this. This is used for creating a Closure containing a retained copy of the variables for delayed evaluation.
        Specified by:
        getStackFrame in interface XPathContext
        Returns:
        array of variables.
      • getTunnelParameters

        public ParameterSet getTunnelParameters()
        Get the tunnel parameters that were passed to the current function or template. This includes all active tunnel parameters whether the current template uses them or not.
        Specified by:
        getTunnelParameters in interface XPathContext
        Returns:
        a ParameterSet containing the tunnel parameters
      • isAtLast

        public boolean isAtLast()
                         throws XPathException
        Determine whether the context position is the same as the context size that is, whether position()=last()
        Specified by:
        isAtLast in interface XPathContext
        Returns:
        true if the context position is the same as the context size.
        Throws:
        XPathException - if a dynamic error occurs while determining the result
      • newCleanContext

        public XPathContextMajor newCleanContext()
        Construct a new context without copying (used for the context in a function call)
        Specified by:
        newCleanContext in interface XPathContext
        Returns:
        a new clean context
      • newContext

        public XPathContextMajor newContext()
        Construct a new context as a copy of another. The new context is effectively added to the top of a stack, and contains a pointer to the previous context
        Specified by:
        newContext in interface XPathContext
        Returns:
        a new context, created as a copy of this context
      • newMinorContext

        public XPathContextMinor newMinorContext()
        Construct a new minor context. A minor context can only hold new values of the focus (currentIterator) and current output destination.
        Specified by:
        newMinorContext in interface XPathContext
        Returns:
        a new minor context
      • setCaller

        public void setCaller​(XPathContext caller)
        Set the calling XPathContext
        Specified by:
        setCaller in interface XPathContext
        Parameters:
        caller - the XPathContext of the calling expression
      • setCurrentIterator

        public void setCurrentIterator​(FocusIterator iter)
        Set a new sequence iterator.
        Specified by:
        setCurrentIterator in interface XPathContext
        Parameters:
        iter - the current iterator. The context item, position, and size are determined by reference to the current iterator.
      • trackFocus

        public FocusIterator trackFocus​(SequenceIterator iter)
        Description copied from interface: XPathContext
        Create, set, and return a focus tracking iterator that wraps a supplied sequence iterator.
        Specified by:
        trackFocus in interface XPathContext
        Parameters:
        iter - the current iterator. The context item, position, and size are determined by reference to the current iterator.
        Returns:
        the required focus tracking iterator
      • setLocalVariable

        public void setLocalVariable​(int slotNumber,
                                     Sequence value)
        Set the value of a local variable, identified by its slot number
        Specified by:
        setLocalVariable in interface XPathContext
        Parameters:
        slotNumber - the slot number allocated at compile time to the variable, which identifies its position within the local stack frame
        value - the value of the variable
      • useLocalParameter

        public int useLocalParameter​(StructuredQName parameterId,
                                     int slotNumber,
                                     boolean isTunnel)
        Use local parameter. This is called when a local xsl:param element is processed. If a parameter of the relevant name was supplied, it is bound to the xsl:param element. Otherwise the method returns false, so the xsl:param default will be evaluated
        Specified by:
        useLocalParameter in interface XPathContext
        Parameters:
        parameterId - Globally-unique parameter identifier
        slotNumber - Slot number of the parameter within the stack frame of the called template
        isTunnel - True if a tunnel parameter is required, else false @return true if a parameter of this name was supplied, false if not
        Returns:
        ParameterSet.NOT_SUPPLIED, ParameterSet.SUPPLIED, or ParameterSet.SUPPLIED_AND_CHECKED
      • getCurrentDateTime

        public DateTimeValue getCurrentDateTime()
                                         throws NoDynamicContextException
        Get the current date and time. This implementation always throws a NoDynamicContextException.
        Specified by:
        getCurrentDateTime in interface XPathContext
        Returns:
        the current date and time. All calls within a single query or transformation will return the same value
        Throws:
        NoDynamicContextException - if this context object is one used only for early evaluation of constant expressions; the current date and time are not available in this case
      • getImplicitTimezone

        public int getImplicitTimezone()
        Get the implicit timezone, as a positive or negative offset from UTC in minutes. The range is -14hours to +14hours. This implementation returns CalendarValue.MISSING_TIMEZONE, meaning the value is unknown.
        Specified by:
        getImplicitTimezone in interface XPathContext
        Returns:
        the implicit timezone, as an offset from UTC in minutes
      • iterateStackFrames

        public java.util.Iterator<ContextStackFrame> iterateStackFrames()
        Get the context stack. This method returns an iterator whose items are instances of ContextStackFrame, starting with the top-most stackframe and ending at the point the query or transformation was invoked by a calling application.
        Specified by:
        iterateStackFrames in interface XPathContext
        Returns:
        an iterator over a copy of the run-time call stack
      • getCurrentException

        public XPathException getCurrentException()
        Get the current exception (in saxon:catch)
        Specified by:
        getCurrentException in interface XPathContext
        Returns:
        the current exception, or null if there is none defined
      • waitForChildThreads

        public void waitForChildThreads()
                                 throws XPathException
        Description copied from interface: XPathContext
        Wait for child threads started under the control of this context to finish. This is called at the end of the (main thread of a) transformation, and also at the end of the "try" part of a try/catch. The threads affected are those used to implement xsl:result-document instructions.
        Specified by:
        waitForChildThreads in interface XPathContext
        Throws:
        XPathException - if any of the child threads have failed with a dynamic error.
      • setTemporaryOutputState

        public void setTemporaryOutputState​(int temporary)
        Description copied from interface: XPathContext
        Set the XSLT output state to "temporary" or "final"
        Specified by:
        setTemporaryOutputState in interface XPathContext
        Parameters:
        temporary - set non-zero to set temporary output state; zero to set final output state
      • getTemporaryOutputState

        public int getTemporaryOutputState()
        Ask whether the XSLT output state is "temporary" or "final"
        Specified by:
        getTemporaryOutputState in interface XPathContext
        Returns:
        non-zero in temporary output state; zero in final output state
      • setCurrentOutputUri

        public void setCurrentOutputUri​(java.lang.String uri)
        Set the current output URI
        Specified by:
        setCurrentOutputUri in interface XPathContext
        Parameters:
        uri - the current output URI, or null if in temporary output state
      • getCurrentOutputUri

        public java.lang.String getCurrentOutputUri()
        Get the current output URI
        Specified by:
        getCurrentOutputUri in interface XPathContext
        Returns:
        the current output URI, or null if in temporary output state
      • getThreadManager

        public XPathContextMajor.ThreadManager getThreadManager()
        Get the thread manager used to process asynchronous xsl:result-document threads.
        Specified by:
        getThreadManager in interface XPathContext
        Returns:
        the current thread manager; or null if multithreading is not supported
      • getTargetComponent

        public Component getTargetComponent​(int bindingSlot)
        Description copied from interface: XPathContext
        Bind a component reference to a component. This is used for binding component references (such as function calls, global variable references, or xsl:call-template) across package boundaries. The binding is done dynamically because, in the presence of overridden components, the choice among different components with the same name depends on which package the caller is in.
        Specified by:
        getTargetComponent in interface XPathContext
        Parameters:
        bindingSlot - Binding slots are allocated statically to the external component references in every component: for example, in the case of a template, to all global variable references, named function calls, and named template calls within that template. The binding slot therefore identifies the name of the component that is required; and the selection of an actual component is done by selection from the binding vector of the component currently being executed
        Returns:
        the component to be invoked