com.icl.saxon

Class Context

Implemented Interfaces:
LastPositionFinder, XSLTContext

public final class Context
extends Object
implements XSLTContext, LastPositionFinder

This class represents a context in which an expression is evaluated or a template is executed (as defined in the XSLT specification). It also provides a range of services to node handlers, for example access to the outputter and bindery, and the applyTemplates() function.

Field Summary

static int
ALL_DEPENDENCIES
static int
CONTEXT_DOCUMENT
static int
CONTEXT_NODE
static int
CONTROLLER
static int
CURRENT_NODE
static int
LAST
static int
NO_DEPENDENCIES
static int
POSITION
static int
VARIABLES
static int
XSLT_CONTEXT

Constructor Summary

Context()
The default constructor is not used within Saxon itself, but is available to applications (and is used in some samples).
Context(Controller c)
Constructor should only be called by the Controller, which acts as a Context factory.

Method Summary

Bindery
getBindery()
Get the Bindery used by this Context
Node
getContextNode()
Get the context node, provided it is a DOM Node
NodeInfo
getContextNodeInfo()
Get the context node
int
getContextPosition()
Get the context position (the position of the context node in the context node list)
int
getContextSize()
Get the context size (the position of the last item in the current node list).
Controller
getController()
Get the controller for this Context
Node
getCurrentNode()
Get the current node,provided it is a DOM Node.
NodeInfo
getCurrentNodeInfo()
Get the current node.
XSLTemplate
getCurrentTemplate()
Get the current template.
XPathException
getException()
Get the saved exception value.
Stack
getGroupActivationStack()
Get the saxon:group activation stack
int
getLast()
Get the context size (the position of the last item in the current node list)
int
getLastPosition()
Get the last position, to be used only when the context object is being used as the last position finder
Mode
getMode()
Get the current mode (for use by the built-in handlers)
Outputter
getOutputter()
Get the current Outputter.
Document
getOwnerDocument()
Get owner Document (enabling extension functions to create new Nodes)
int
getRememberedNumber(NodeInfo node)
Get the number of a node if it is the last remembered one.
Value
getReturnValue()
Get the return value from function
StaticContext
getStaticContext()
Get the static context.
ParameterSet
getTailRecursion()
Get tail recursion parameters
boolean
isAtLast()
Determine whether the context position is the same as the context size that is, whether position()=last()
Context
newContext()
Construct a new context as a copy of another
void
setContextNode(NodeInfo node)
Set the context node.
void
setController(Controller c)
Set the controller for this Context
void
setCurrentNode(NodeInfo node)
Set the current node.
void
setCurrentTemplate(XSLTemplate template)
Set the current template.
void
setException(XPathException err)
Set an exception value.
void
setLast(int last)
Set the context size; this also makes the Context object responisble for returning the last() position.
void
setLastPositionFinder(LastPositionFinder finder)
Set the LastPositionFinder, another object that will do the work of returning the last() position
void
setMode(Mode mode)
Set the mode (for use by the built-in handlers)
void
setPosition(int pos)
Set the context position
void
setRememberedNumber(NodeInfo node, int number)
Set the last remembered node, for node numbering purposes
void
setReturnValue(Value value)
Set return value from function
void
setStaticContext(StaticContext sc)
Set the static context
void
setTailRecursion(ParameterSet p)
Set tail recursion parameters
String
stringValue(Node n)
Return the String value of a node
Object
systemProperty(String namespaceURI, String localName)
Get the value of a system property

Field Details

ALL_DEPENDENCIES

public static final int ALL_DEPENDENCIES
Field Value:
255

CONTEXT_DOCUMENT

public static final int CONTEXT_DOCUMENT
Field Value:
128

CONTEXT_NODE

public static final int CONTEXT_NODE
Field Value:
8

CONTROLLER

public static final int CONTROLLER
Field Value:
64

CURRENT_NODE

public static final int CURRENT_NODE
Field Value:
4

LAST

public static final int LAST
Field Value:
32

NO_DEPENDENCIES

public static final int NO_DEPENDENCIES
Field Value:
0

POSITION

public static final int POSITION
Field Value:
16

VARIABLES

public static final int VARIABLES
Field Value:
1

XSLT_CONTEXT

public static final int XSLT_CONTEXT
Field Value:
69

Constructor Details

Context

public Context()
The default constructor is not used within Saxon itself, but is available to applications (and is used in some samples). Because some expressions (for example union expressions) cannot execute without a Controller, a system default Controller is created. This is a quick fix, but is not entirely satisfactory, because it's not thread-safe. Applications are encouraged to create a Controller explicitly and use it only within a single thread.

Context

public Context(Controller c)
Constructor should only be called by the Controller, which acts as a Context factory.

Method Details

getBindery

public Bindery getBindery()
Get the Bindery used by this Context

getContextNode

public Node getContextNode()
Get the context node, provided it is a DOM Node
Specified by:
getContextNode in interface XSLTContext
Returns:
the context node if it is a DOM Node, otherwise null

getContextNodeInfo

public NodeInfo getContextNodeInfo()
Get the context node
Returns:
the context node

getContextPosition

public int getContextPosition()
Get the context position (the position of the context node in the context node list)
Specified by:
getContextPosition in interface XSLTContext
Returns:
the context position (starting at one)

getContextSize

public int getContextSize()
Get the context size (the position of the last item in the current node list). This is the XSLTContext method: it differs from getLast() in that it cannot throw an exception. This method should be called only from within extension functions. If any error occurs, it will be accessible via Context#getException().
Specified by:
getContextSize in interface XSLTContext
Returns:
the context size

getController

public Controller getController()
Get the controller for this Context

getCurrentNode

public Node getCurrentNode()
Get the current node,provided it is a DOM Node. This is the node in the source document currently being processed (e.g. by apply-templates). It is not necessarily the same as the context node: the context node can change in a sub-expression, the current node cannot.
Specified by:
getCurrentNode in interface XSLTContext
Returns:
the current node if it is a DOM Node; otherwise null.

getCurrentNodeInfo

public NodeInfo getCurrentNodeInfo()
Get the current node. This is the node in the source document currently being processed (e.g. by apply-templates). It is not necessarily the same as the context node: the context node can change in a sub-expression, the current node cannot.

getCurrentTemplate

public XSLTemplate getCurrentTemplate()
Get the current template. This is used to support xsl:apply-imports

getException

public XPathException getException()
Get the saved exception value.

getGroupActivationStack

public Stack getGroupActivationStack()
Get the saxon:group activation stack

getLast

public int getLast()
            throws XPathException
Get the context size (the position of the last item in the current node list)
Returns:
the context size

getLastPosition

public int getLastPosition()
Get the last position, to be used only when the context object is being used as the last position finder
Specified by:
getLastPosition in interface LastPositionFinder

getMode

public Mode getMode()
Get the current mode (for use by the built-in handlers)

getOutputter

public Outputter getOutputter()
Get the current Outputter. This gives access to the writeStartTag, writeAttribute, and writeEndTag methods
Returns:
the current Outputter

getOwnerDocument

public Document getOwnerDocument()
Get owner Document (enabling extension functions to create new Nodes)
Specified by:
getOwnerDocument in interface XSLTContext

getRememberedNumber

public int getRememberedNumber(NodeInfo node)
Get the number of a node if it is the last remembered one.
Returns:
the number of this node if known, else -1.

getReturnValue

public Value getReturnValue()
Get the return value from function

getStaticContext

public StaticContext getStaticContext()
Get the static context. This is currently available only while processing an extension function

getTailRecursion

public ParameterSet getTailRecursion()
Get tail recursion parameters

isAtLast

public boolean isAtLast()
            throws XPathException
Determine whether the context position is the same as the context size that is, whether position()=last()

newContext

public Context newContext()
Construct a new context as a copy of another

setContextNode

public void setContextNode(NodeInfo node)
Set the context node.
Note that this has no effect on position() or last(), which must be set separately.
Parameters:
node - the node that is to be the context node.

setController

public void setController(Controller c)
Set the controller for this Context

setCurrentNode

public void setCurrentNode(NodeInfo node)
Set the current node. This is the node in the source document currently being processed (e.g. by apply-templates).

setCurrentTemplate

public void setCurrentTemplate(XSLTemplate template)
Set the current template. This is used to support xsl:apply-imports

setException

public void setException(XPathException err)
Set an exception value. This is useful when an extension function makes a call such as getContextSize() that causes an error. The error is saved as part of the context, and reported on return from the extension function

setLast

public void setLast(int last)
Set the context size; this also makes the Context object responisble for returning the last() position.

setLastPositionFinder

public void setLastPositionFinder(LastPositionFinder finder)
Set the LastPositionFinder, another object that will do the work of returning the last() position

setMode

public void setMode(Mode mode)
Set the mode (for use by the built-in handlers)

setPosition

public void setPosition(int pos)
Set the context position

setRememberedNumber

public void setRememberedNumber(NodeInfo node,
                                int number)
Set the last remembered node, for node numbering purposes

setReturnValue

public void setReturnValue(Value value)
            throws TransformerException
Set return value from function

setStaticContext

public void setStaticContext(StaticContext sc)
Set the static context

setTailRecursion

public void setTailRecursion(ParameterSet p)
Set tail recursion parameters

stringValue

public String stringValue(Node n)
Return the String value of a node
Specified by:
stringValue in interface XSLTContext

systemProperty

public Object systemProperty(String namespaceURI,
                             String localName)
Get the value of a system property
Specified by:
systemProperty in interface XSLTContext