Package com.saxonica.ee.stream.feed
Class MotionlessFeed
java.lang.Object
net.sf.saxon.event.Outputter
net.sf.saxon.event.ProxyOutputter
com.saxonica.ee.stream.feed.ItemFeed
com.saxonica.ee.stream.feed.MotionlessFeed
A feed for an expression that typically accesses the context item but does not consume the input stream.
This class only ever appears as the first thing triggered by a watch. It evaluates the non-consuming
expression immediately when the start event is reported, supplying the items that result from the
evaluation to the next feed in the pipeline.
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Field Summary
Fields inherited from class net.sf.saxon.event.Outputter
pipelineConfiguration, systemId
Fields inherited from interface javax.xml.transform.Result
PI_DISABLE_OUTPUT_ESCAPING, PI_ENABLE_OUTPUT_ESCAPING
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Constructor Summary
ConstructorsConstructorDescriptionMotionlessFeed
(Expression expression, ItemFeed result, XPathContext context) -
Method Summary
Modifier and TypeMethodDescriptionvoid
Supply one item towards the streamed input of the expressionvoid
endSelectedParentNode
(Location locationId) Signal that the endElement event has occurred for the element whose startElement event caused the Watch to be activated.startSelectedParentNode
(FleetingParentNode node, Location locationId) Signal that an element or document node has been found that matches the selection that this Watch is looking for.Methods inherited from class com.saxonica.ee.stream.feed.ItemFeed
append, close, dynamicError, getContext, getExpression, getResultFeed, getTerminator, hasFailed, open, processItems, setExpression, setHasFailed, setTerminator
Methods inherited from class net.sf.saxon.event.ProxyOutputter
attribute, characters, comment, endDocument, endElement, getNextOutputter, namespace, open, processingInstruction, setUnparsedEntity, startContent, startDocument, startElement, startElement, usesTypeAnnotations
Methods inherited from class net.sf.saxon.event.Outputter
getConfiguration, getPipelineConfiguration, getStringReceiver, getSystemId, namespaces, setPipelineConfiguration, setSystemId, spreadStartElement
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods inherited from interface net.sf.saxon.event.Receiver
handlesAppend
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Constructor Details
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Method Details
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startSelectedParentNode
public Receiver startSelectedParentNode(FleetingParentNode node, Location locationId) throws XPathException Signal that an element or document node has been found that matches the selection that this Watch is looking for. This method is called by the WatchManager while processing the startElement or startDocument event that matches the selection.- Overrides:
startSelectedParentNode
in classItemFeed
- Parameters:
node
- the element or document node whose start event has been matchedlocationId
- the location associated with the element or document node (may be the location of the instruction that created it)- Returns:
- a Receiver to be notified of all events starting with the startElement/startDocument event for the matched element, and ending with the endElement event for that element; or null if this feature is not required.
- Throws:
XPathException
- May be raised if a dynamic error occurs
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append
Supply one item towards the streamed input of the expression- Specified by:
append
in interfaceReceiver
- Specified by:
append
in classItemFeed
- Parameters:
item
- the item to be supplied- Throws:
XPathException
- if the operation fails
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endSelectedParentNode
Description copied from class:ItemFeed
Signal that the endElement event has occurred for the element whose startElement event caused the Watch to be activated.- Overrides:
endSelectedParentNode
in classItemFeed
- Parameters:
locationId
- the location of the element- Throws:
XPathException
- May be raised if a constraint implemented by this Watch is violated
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