Package net.sf.saxon.expr

Class XPathContextMajor

java.lang.Object
net.sf.saxon.expr.XPathContextMinor
net.sf.saxon.expr.XPathContextMajor
All Implemented Interfaces:
XPathContext
public class XPathContextMajor extends XPathContextMinor
This class represents a "major context" in which an XPath expression is evaluated: a "major context" object allows all aspects of the dynamic context to change, whereas a "minor context" only allows changes to the focus and the destination for push output.

  • Field Details

    • isTemporaryDestination

      boolean isTemporaryDestination

    • origin

      Object origin

  • Constructor Details

    • XPathContextMajor

      public XPathContextMajor(Controller controller)
      Constructor should only be called by the Controller, which acts as a XPathContext factory.
      Parameters:
      controller - the Controller

    • XPathContextMajor

      public XPathContextMajor(Item item, Executable exec)
      Constructor for use in free-standing Java applications.
      Parameters:
      item - the item to use as the initial context item. If this is null, the comtext item is initially undefined (which will cause a dynamic error if it is referenced).
      exec - the Executable

    • XPathContextMajor

      public XPathContextMajor(Item item, Configuration config)
      Deprecated.
      since 9.0 - use XPathContextMajor(Item, Executable)
      Constructor for use in free-standing Java applications.
      Parameters:
      item - the item to use as the initial context item. If this is null, the comtext item is initially undefined (which will cause a dynamic error if it is referenced).
      config - the Saxon Configuration

  • Method Details

    • 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. The
      Specified by:
      newContext in interface XPathContext
      Overrides:
      newContext in class XPathContextMinor
      Returns:
      a new context, created as a copy of this context

    • newContext

      public static XPathContextMajor newContext(XPathContextMinor prev)
      Create a new "major" context (one that is capable of holding a stack frame with local variables
      Parameters:
      prev - the previous context (the one causing the new context to be created)
      Returns:
      the new major context

    • newThreadContext

      public static XPathContextMajor newThreadContext(XPathContextMinor prev)

    • getLocalParameters

      public ParameterSet getLocalParameters()
      Get the local parameters for the current template call.
      Specified by:
      getLocalParameters in interface XPathContext
      Overrides:
      getLocalParameters in class XPathContextMinor
      Returns:
      the supplied parameters

    • setLocalParameters

      public void setLocalParameters(ParameterSet localParameters)
      Set the local parameters for the current template call.
      Parameters:
      localParameters - the supplied parameters

    • getTunnelParameters

      public ParameterSet getTunnelParameters()
      Get the tunnel parameters for the current template call.
      Specified by:
      getTunnelParameters in interface XPathContext
      Overrides:
      getTunnelParameters in class XPathContextMinor
      Returns:
      the supplied tunnel parameters

    • setTunnelParameters

      public void setTunnelParameters(ParameterSet tunnelParameters)
      Set the tunnel parameters for the current template call.
      Parameters:
      tunnelParameters - the supplied tunnel parameters

    • setOrigin

      public void setOrigin(InstructionInfo expr)
      Set the creating expression (for use in diagnostics). The origin is generally set to "this" by the object that creates the new context. It's up to the debugger to determine whether this information is useful. The object will either be an Expression, allowing information about the calling instruction to be obtained, or null.

    • setOriginatingConstructType

      public void setOriginatingConstructType(int loc)
      Set the type of creating expression (for use in diagnostics). When a new context is created, either this method or setOrigin(net.sf.saxon.trace.InstructionInfo) should be called.
      Parameters:
      loc - The originating location: the argument must be one of the integer constants in class Location

    • getOriginatingConstructType

      public int getOriginatingConstructType()
      Get the type of location from which this context was created.

    • getOrigin

      public InstructionInfo getOrigin()
      Get information about the creating expression or other construct.

    • setStackFrame

      public void setStackFrame(SlotManager map, ValueRepresentation[] variables)
      Set the local stack frame. This method is used when creating a Closure to support delayed evaluation of expressions. The "stack frame" is actually on the Java heap, which means it can survive function returns and the like.
      Parameters:
      map - the SlotManager, which holds static details of the allocation of variables to slots
      variables - the array of "slots" to hold the actual variable values. This array will be copied if it is too small to hold all the variables defined in the SlotManager

    • resetStackFrameMap

      public void resetStackFrameMap(SlotManager map, int numberOfParams)
      Reset the stack frame variable map, while reusing the StackFrame object itself. This is done on a tail call to a different function
      Parameters:
      map - the SlotManager representing the stack frame contents
      numberOfParams - the number of parameters required on the new stack frame

    • getAllVariableValues

      public ValueRepresentation[] getAllVariableValues()
      Get a all the variables in the stack frame
      Returns:
      an array holding all the variables, each referenceable by its slot number

    • resetAllVariableValues

      public void resetAllVariableValues(ValueRepresentation[] values)
      Overwrite all the variables in the stack frame
      Parameters:
      values - an array holding all the variables, each referenceable by its slot number; the caller must ensure this is the correct length (and valid in other ways)

    • resetParameterValues

      public void resetParameterValues(ValueRepresentation[] values)
      Overwrite all the parameters in the stack frame. (Used from compiled bytecode)
      Parameters:
      values - an array holding all the parameters, each referenceable by its slot number; the caller must ensure this is the correct length (and valid in other ways)

    • requestTailCall

      public void requestTailCall(UserFunction fn, ValueRepresentation[] variables)
      Reset the local stack frame. This method is used when processing a tail-recursive function. Instead of the function being called recursively, the parameters are set to new values and the function body is evaluated repeatedly
      Parameters:
      fn - the user function being called using tail recursion
      variables - the parameter to be supplied to the user function

    • getTailCallFunction

      public UserFunction getTailCallFunction()
      Determine whether the body of a function is to be repeated, due to tail-recursive function calls
      Returns:
      null if no tail call has been requested, or the name of the function to be called otherwise

    • openStackFrame

      public void openStackFrame(SlotManager map)
      Create a new stack frame for local variables, using the supplied SlotManager to define the allocation of slots to individual variables
      Parameters:
      map - the SlotManager for the new stack frame

    • openStackFrame

      public void openStackFrame(int numberOfVariables)
      Create a new stack frame large enough to hold a given number of local variables, for which no stack frame map is available. This is used in particular when evaluating match patterns of template rules.
      Parameters:
      numberOfVariables - The number of local variables to be accommodated.

    • setCurrentMode

      public void setCurrentMode(Mode mode)
      Set the current mode.
      Parameters:
      mode - the new current mode

    • getCurrentMode

      public Mode getCurrentMode()
      Get the current mode.
      Specified by:
      getCurrentMode in interface XPathContext
      Overrides:
      getCurrentMode in class XPathContextMinor
      Returns:
      the current mode. May return null if the current mode is the default mode.

    • setCurrentTemplateRule

      public void setCurrentTemplateRule(Rule rule)
      Set the current template. This is used to support xsl:apply-imports. The caller is responsible for remembering the previous current template and resetting it after use.
      Parameters:
      rule - the current template rule, or null to indicate that there is no current template rule

    • getCurrentTemplateRule

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

    • setCurrentGroupIterator

      public void setCurrentGroupIterator(GroupIterator iterator)
      Set the current grouping iterator. This supports the current-group() and current-grouping-key() functions in XSLT 2.0
      Parameters:
      iterator - the new current GroupIterator

    • 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
      Overrides:
      getCurrentGroupIterator in class XPathContextMinor
      Returns:
      the current grouped collection

    • setCurrentRegexIterator

      public void setCurrentRegexIterator(RegexIterator currentRegexIterator)
      Set the current regex iterator. This supports the functionality of the regex-group() function in XSLT 2.0.
      Parameters:
      currentRegexIterator - the current regex iterator

    • 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
      Overrides:
      getCurrentRegexIterator in class XPathContextMinor
      Returns:
      the current regular expressions iterator

    • useLocalParameter

      public int useLocalParameter(int parameterId, int slotNumber, boolean isTunnel) throws XPathException
      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
      Overrides:
      useLocalParameter in class XPathContextMinor
      Parameters:
      parameterId -
      slotNumber -
      isTunnel - True if a tunnel parameter is required, else false @return ParameterSet.NOT_SUPPLIED, ParameterSet.SUPPLIED, or ParameterSet.SUPPLIED_AND_CHECKED
      Returns:
      ParameterSet.NOT_SUPPLIED, ParameterSet.SUPPLIED, or ParameterSet.SUPPLIED_AND_CHECKED
      Throws:
      XPathException

    • setTemporaryOutputState

      public void setTemporaryOutputState(boolean temporary)
      Set the XSLT output state to "temporary" or "final"
      Parameters:
      temporary - set to true to set temporary output state; false to set final output state

    • isTemporaryOutputState

      public boolean isTemporaryOutputState()
      Ask whether the XSLT output state is "temporary" or "final"
      Specified by:
      isTemporaryOutputState in interface XPathContext
      Overrides:
      isTemporaryOutputState in class XPathContextMinor
      Returns:
      true to set temporary output state; false to set final output state