net.sf.saxon.sxpath

Class XPathDynamicContext

java.lang.Object

net.sf.saxon.sxpath.XPathDynamicContext

public class XPathDynamicContext
extends Object

This object represents the dynamic XPath execution context for use in the free-standing Saxon XPath API. The dynamic context holds the context item and the values of external variables used by the XPath expression.

This object is always created via the method XPathExpression.createDynamicContext(net.sf.saxon.om.Item)

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	XPathDynamicContext(ItemType contextItemType, XPathContextMajor contextObject, SlotManager stackFrameMap)

Method Summary

Methods

Modifier and Type	Method and Description
protected void	checkExternalVariables(SlotManager stackFrameMap, int numberOfExternals) Check that all external variables have been given a value
CollectionURIResolver	getCollectionURIResolver() Get the CollectionURIResolver used for resolving references to collections.
Item	getContextItem() Get the context item
UnfailingErrorListener	getErrorListener() Get the error listener.
UnparsedTextURIResolver	getUnparsedTextURIResolver() Get the URI resolver for unparsed text.
URIResolver	getURIResolver() Get the URI resolver.
XPathContext	getXPathContextObject() For system use: get the wrapped XPathContext object
void	setCollectionURIResolver(CollectionURIResolver resolver) Set the CollectionURIResolver used for resolving collection URIs.
void	setContextItem(Item item) Set the context item for evaluation of the XPath Expression
void	setErrorListener(ErrorListener listener) Set the error listener.
void	setUnparsedTextURIResolver(UnparsedTextURIResolver resolver) Set an object that will be used to resolve URIs used in fn:unparsed-text() and related functions.
void	setURIResolver(URIResolver resolver) Set an object that will be used to resolve URIs used in document(), etc.
void	setVariable(XPathVariable variable, Sequence value) Set the value of an external variable used within the XPath expression

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

XPathDynamicContext

protected XPathDynamicContext(ItemType contextItemType,
                   XPathContextMajor contextObject,
                   SlotManager stackFrameMap)

Method Detail

setContextItem

public void setContextItem(Item item)
                    throws XPathException

Set the context item for evaluation of the XPath Expression

Parameters:

item - the context item

Throws:

XPathException - if the node is in a document that was built under the wrong configuration

getContextItem

public Item getContextItem()

Get the context item

Returns:

the context item if there is one, or null otherwise

setVariable

public void setVariable(XPathVariable variable,
               Sequence value)
                 throws XPathException

Set the value of an external variable used within the XPath expression

Parameters:

variable - the object representing the variable. Note that setting the value of a variable does not modify the XPathVariable object itself, which means that this method is thread-safe.

value - The value of the variable.

Throws:

XPathException - if the supplied value does not conform to the required type of the variable; or if the supplied value contains a node that does not belong to this Configuration (or another Configuration that shares the same namePool)

setURIResolver

public void setURIResolver(URIResolver resolver)

Set an object that will be used to resolve URIs used in document(), etc. The URIResolver is set locally to this XPathContext object.

Parameters:

resolver - An object that implements the URIResolver interface, or null.

Since:

9.2. Changed in 9.6 to set the URIResolver locally.

getURIResolver

public URIResolver getURIResolver()

Get the URI resolver.

Returns:

the user-supplied URI resolver if there is one, or null otherwise. If no URIResolver has been set locally, the URIResolver in the Controller is returned; this in turn defaults to the URIResolver set in the Configuration.

Since:

9.2. Changed in 9.6 to use a local URIResolver.

setCollectionURIResolver

public void setCollectionURIResolver(CollectionURIResolver resolver)

Set the CollectionURIResolver used for resolving collection URIs. Defaults to the CollectionURIResolver registered with the Configuration

Parameters:

resolver - the resolver for references to collections

Since:

9.4

getCollectionURIResolver

public CollectionURIResolver getCollectionURIResolver()

Get the CollectionURIResolver used for resolving references to collections. If none has been set on the Controller, returns the CollectionURIResolver registered with the Configuration

Returns:

the resolver for references to collections

Since:

9.4

setErrorListener

public void setErrorListener(ErrorListener listener)

Set the error listener. The ErrorListener is set locally to this XPathContext object.

Parameters:

listener - the ErrorListener to be used

Since:

9.2. Changed in 9.6 to set the ErrorListener locally.

getErrorListener

public UnfailingErrorListener getErrorListener()

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.

Returns:

the ErrorListener in use. This will always be an UnfailingErrorListener, which is a Saxon subclass of ErrorListener that throws no exceptions.

Since:

9.2. Changed in 9.6 to use a local ErrorListener.

getXPathContextObject

public XPathContext getXPathContextObject()

For system use: get the wrapped XPathContext object

Returns:

the underlying XPathContext object

setUnparsedTextURIResolver

public void setUnparsedTextURIResolver(UnparsedTextURIResolver resolver)

Set an object that will be used to resolve URIs used in fn:unparsed-text() and related functions.

Parameters:

resolver - An object that implements the UnparsedTextURIResolver interface, or null.

Since:

9.5

getUnparsedTextURIResolver

public UnparsedTextURIResolver getUnparsedTextURIResolver()

Get the URI resolver for unparsed text.

Returns:

the user-supplied unparsed text URI resolver if there is one, or the system-defined one otherwise

Since:

9.5

checkExternalVariables

protected void checkExternalVariables(SlotManager stackFrameMap,
                          int numberOfExternals)
                               throws XPathException

Check that all external variables have been given a value

Parameters:

stackFrameMap - describes the stack frame

numberOfExternals - the number of variables that need to be supplied

Throws:

XPathException - if required variables have not been given a value