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java.lang.Object net.sf.saxon.sxpath.XPathDynamicContext
public class XPathDynamicContext
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 | |
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protected |
XPathDynamicContext(ItemType contextItemType,
XPathContextMajor contextObject,
SlotManager stackFrameMap)
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Method Summary | |
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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 |
ErrorListener |
getErrorListener()
Get the error listener. |
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 |
setContextNode(Source source)
Set the context item to a node derived from a supplied Source object. |
void |
setErrorListener(ErrorListener listener)
Set the error listener. |
void |
setURIResolver(URIResolver resolver)
Set an object that will be used to resolve URIs used in document(), etc. |
void |
setVariable(XPathVariable variable,
ValueRepresentation value)
Set the value of an external variable used within the XPath expression |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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protected XPathDynamicContext(ItemType contextItemType, XPathContextMajor contextObject, SlotManager stackFrameMap)
Method Detail |
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public void setContextNode(Source source) throws XPathException
NodeInfo
interface, representing a node in a tree, is one such
implementation; others include StreamSource
,
SAXSource
, and DOMSource
source
- The source object representing the node that will be used as the context item
XPathException
- if a failure occurs reading or parsing a Source object to build an input tree,
or if the source is a document that was built under the wrong configurationpublic void setContextItem(Item item) throws XPathException
item
- the context item
XPathException
- if the node is in a document that was built under the wrong configurationpublic Item getContextItem()
public void setVariable(XPathVariable variable, ValueRepresentation value) throws XPathException
variable
- the object representing the variable, as returned by the
XPathEvaluator.declareVariable(String, String)
method.
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.
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)public void setURIResolver(URIResolver resolver)
resolver
- An object that implements the URIResolver interface, or
null.public URIResolver getURIResolver()
public void setCollectionURIResolver(CollectionURIResolver resolver)
resolver
- the resolver for references to collectionspublic CollectionURIResolver getCollectionURIResolver()
public void setErrorListener(ErrorListener listener)
listener
- the ErrorListener to be usedpublic ErrorListener getErrorListener()
public XPathContext getXPathContextObject()
protected void checkExternalVariables(SlotManager stackFrameMap, int numberOfExternals) throws XPathException
stackFrameMap
- describes the stack framenumberOfExternals
- the number of variables that need to be supplied
XPathException
- if required variables have not been given a value
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