Package net.sf.saxon.expr
Class XPathContextMajor
- java.lang.Object
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- net.sf.saxon.expr.XPathContextMinor
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- net.sf.saxon.expr.XPathContextMajor
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- 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.
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Nested Class Summary
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Nested classes/interfaces inherited from class net.sf.saxon.expr.XPathContextMinor
XPathContextMinor.LastValue
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Field Summary
Fields Modifier and Type Field Description (package private) boolean
isTemporaryDestination
(package private) java.lang.Object
origin
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Fields inherited from class net.sf.saxon.expr.XPathContextMinor
caller, controller, currentException, currentIterator, currentReceiver, last, stackFrame
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Constructor Summary
Constructors Constructor Description XPathContextMajor(Controller controller)
Constructor should only be called by the Controller, which acts as a XPathContext factory.XPathContextMajor(Item item, Configuration config)
Deprecated.since 9.0 - useXPathContextMajor(Item, Executable)
XPathContextMajor(Item item, Executable exec)
Constructor for use in free-standing Java applications.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description ValueRepresentation[]
getAllVariableValues()
Get a all the variables in the stack frameGroupIterator
getCurrentGroupIterator()
Get the current group iterator.Mode
getCurrentMode()
Get the current mode.RegexIterator
getCurrentRegexIterator()
Get the current regex iterator.Rule
getCurrentTemplateRule()
Get the current template.ParameterSet
getLocalParameters()
Get the local parameters for the current template call.InstructionInfo
getOrigin()
Get information about the creating expression or other construct.int
getOriginatingConstructType()
Get the type of location from which this context was created.UserFunction
getTailCallFunction()
Determine whether the body of a function is to be repeated, due to tail-recursive function callsParameterSet
getTunnelParameters()
Get the tunnel parameters for the current template call.boolean
isTemporaryOutputState()
Ask whether the XSLT output state is "temporary" or "final"XPathContextMajor
newContext()
Construct a new context as a copy of another.static XPathContextMajor
newContext(XPathContextMinor prev)
Create a new "major" context (one that is capable of holding a stack frame with local variablesstatic XPathContextMajor
newThreadContext(XPathContextMinor prev)
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.void
openStackFrame(SlotManager map)
Create a new stack frame for local variables, using the supplied SlotManager to define the allocation of slots to individual variablesvoid
requestTailCall(UserFunction fn, ValueRepresentation[] variables)
Reset the local stack frame.void
resetAllVariableValues(ValueRepresentation[] values)
Overwrite all the variables in the stack framevoid
resetParameterValues(ValueRepresentation[] values)
Overwrite all the parameters in the stack frame.void
resetStackFrameMap(SlotManager map, int numberOfParams)
Reset the stack frame variable map, while reusing the StackFrame object itself.void
setCurrentGroupIterator(GroupIterator iterator)
Set the current grouping iterator.void
setCurrentMode(Mode mode)
Set the current mode.void
setCurrentRegexIterator(RegexIterator currentRegexIterator)
Set the current regex iterator.void
setCurrentTemplateRule(Rule rule)
Set the current template.void
setLocalParameters(ParameterSet localParameters)
Set the local parameters for the current template call.void
setOrigin(InstructionInfo expr)
Set the creating expression (for use in diagnostics).void
setOriginatingConstructType(int loc)
Set the type of creating expression (for use in diagnostics).void
setStackFrame(SlotManager map, ValueRepresentation[] variables)
Set the local stack frame.void
setTemporaryOutputState(boolean temporary)
Set the XSLT output state to "temporary" or "final"void
setTunnelParameters(ParameterSet tunnelParameters)
Set the tunnel parameters for the current template call.int
useLocalParameter(int parameterId, int slotNumber, boolean isTunnel)
Use local parameter.-
Methods inherited from class net.sf.saxon.expr.XPathContextMinor
changeOutputDestination, evaluateLocalVariable, getCaller, getCollation, getConfiguration, getContextItem, getController, getCurrentDateTime, getCurrentException, getCurrentIterator, getImplicitTimezone, getLast, getNameChecker, getNamePool, getReceiver, getStackFrame, isAtLast, iterateStackFrames, newCleanContext, newMinorContext, setCaller, setCurrentException, setCurrentIterator, setLocalVariable, setReceiver
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Constructor Detail
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XPathContextMajor
public XPathContextMajor(Controller controller)
Constructor should only be called by the Controller, which acts as a XPathContext factory.- Parameters:
controller
- the Controller
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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
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XPathContextMajor
public XPathContextMajor(Item item, Configuration config)
Deprecated.since 9.0 - useXPathContextMajor(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
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Method Detail
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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 interfaceXPathContext
- Overrides:
newContext
in classXPathContextMinor
- Returns:
- a new context, created as a copy of this context
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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
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newThreadContext
public static XPathContextMajor newThreadContext(XPathContextMinor prev)
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getLocalParameters
public ParameterSet getLocalParameters()
Get the local parameters for the current template call.- Specified by:
getLocalParameters
in interfaceXPathContext
- Overrides:
getLocalParameters
in classXPathContextMinor
- Returns:
- the supplied parameters
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setLocalParameters
public void setLocalParameters(ParameterSet localParameters)
Set the local parameters for the current template call.- Parameters:
localParameters
- the supplied parameters
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getTunnelParameters
public ParameterSet getTunnelParameters()
Get the tunnel parameters for the current template call.- Specified by:
getTunnelParameters
in interfaceXPathContext
- Overrides:
getTunnelParameters
in classXPathContextMinor
- Returns:
- the supplied tunnel parameters
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setTunnelParameters
public void setTunnelParameters(ParameterSet tunnelParameters)
Set the tunnel parameters for the current template call.- Parameters:
tunnelParameters
- the supplied tunnel parameters
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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 anExpression
, allowing information about the calling instruction to be obtained, or null.
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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 orsetOrigin(net.sf.saxon.trace.InstructionInfo)
should be called.- Parameters:
loc
- The originating location: the argument must be one of the integer constants in classLocation
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getOriginatingConstructType
public int getOriginatingConstructType()
Get the type of location from which this context was created.
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getOrigin
public InstructionInfo getOrigin()
Get information about the creating expression or other construct.
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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 slotsvariables
- 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
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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 contentsnumberOfParams
- the number of parameters required on the new stack frame
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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
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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)
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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)
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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 recursionvariables
- the parameter to be supplied to the user function
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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
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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
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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.
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setCurrentMode
public void setCurrentMode(Mode mode)
Set the current mode.- Parameters:
mode
- the new current mode
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getCurrentMode
public Mode getCurrentMode()
Get the current mode.- Specified by:
getCurrentMode
in interfaceXPathContext
- Overrides:
getCurrentMode
in classXPathContextMinor
- Returns:
- the current mode. May return null if the current mode is the default mode.
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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
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getCurrentTemplateRule
public Rule getCurrentTemplateRule()
Get the current template. This is used to support xsl:apply-imports- Specified by:
getCurrentTemplateRule
in interfaceXPathContext
- Overrides:
getCurrentTemplateRule
in classXPathContextMinor
- Returns:
- the current template
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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
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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 interfaceXPathContext
- Overrides:
getCurrentGroupIterator
in classXPathContextMinor
- Returns:
- the current grouped collection
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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
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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 interfaceXPathContext
- Overrides:
getCurrentRegexIterator
in classXPathContextMinor
- Returns:
- the current regular expressions iterator
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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 interfaceXPathContext
- Overrides:
useLocalParameter
in classXPathContextMinor
- 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
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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
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isTemporaryOutputState
public boolean isTemporaryOutputState()
Ask whether the XSLT output state is "temporary" or "final"- Specified by:
isTemporaryOutputState
in interfaceXPathContext
- Overrides:
isTemporaryOutputState
in classXPathContextMinor
- Returns:
- true to set temporary output state; false to set final output state
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