Class XsltTransformer
- java.lang.Object
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- net.sf.saxon.s9api.XsltTransformer
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- All Implemented Interfaces:
Destination
public class XsltTransformer extends java.lang.Object implements Destination
AnXsltTransformerrepresents a compiled and loaded stylesheet ready for execution. TheXsltTransformerholds details of the dynamic evaluation context for the stylesheet.An
XsltTransformermust not be used concurrently in multiple threads. It is safe, however, to reuse the object within a single thread to run the same stylesheet several times. Running the stylesheet does not change the context that has been established. Some of the public methods are synchronized: this is not because multi-threaded execution is supported, rather it is to reduce the damage if multi-threaded execution is attempted.An
XsltTransformeris always constructed by running theLoadmethod of anXsltExecutable.An
XsltTransformeris itself aDestination. This means it is possible to use oneXsltTransformeras the destination to receive the results of another transformation, this providing a simple way for transformations to be chained into a pipeline. Note however that a when the input to a transformation is supplied in this way, it will always be built as a tree in memory, rather than the transformation being streamed. As aDestination, the transformer performs Sequence Normalization on its input; that is, it converts the input to a single document node. (The main reason for this is that when chaining XSLT transformations, the raw output of the first stylesheet is often an element node, but the second stylesheet traditionally expects a document node.)- Since:
- 9.0
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Field Summary
Fields Modifier and Type Field Description protected booleanbaseOutputUriWasSetprotected XsltControllercontrollerprotected Processorprocessor
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Constructor Summary
Constructors Modifier Constructor Description protectedXsltTransformer(Processor processor, XsltController controller, GlobalParameterSet staticParameters)Protected constructor
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Method Summary
All Methods Instance Methods Concrete Methods Deprecated Methods Modifier and Type Method Description protected voidapplyTemplatesToSource(javax.xml.transform.Source source, Receiver out)voidclearParameters()Clear the values of all parameters that have been setvoidclose()Close this destination, allowing resources to be released.voidcloseAndNotify()Close the destination and notify all registered listeners that it has been closed.java.lang.StringgetBaseOutputURI()Get the base output URI.DestinationgetDestination()Get the destination that was specified in a previous call ofsetDestination(net.sf.saxon.s9api.Destination)java.net.URIgetDestinationBaseURI()Get the base URI of the resource being written to this destinationReceivergetDestinationReceiver(XsltController controller, Destination destination)Get a Receiver corresponding to the chosen Destination for the transformationjavax.xml.transform.ErrorListenergetErrorListener()Get the ErrorListener being used during this transformationErrorReportergetErrorReporter()XdmNodegetInitialContextNode()Get the initial context node for the transformation, if one has been setQNamegetInitialMode()Get the name of the initial mode for the transformation, if one has been set.QNamegetInitialTemplate()Get the initial named template for the transformation, if one has been setMessageListenergetMessageListener()Get the MessageListener to be notified whenever the stylesheet evaluates anxsl:messageinstruction.MessageListener2getMessageListener2()Get the MessageListener2 to be notified whenever the stylesheet evaluates anxsl:messageinstruction.XdmValuegetParameter(QName name)Get the value that has been set for a stylesheet parameterReceivergetReceiver(PipelineConfiguration pipe, SerializationProperties params)Return a Receiver which can be used to supply the principal source document for the transformation.protected ReceivergetReceivingTransformer(XsltController controller, GlobalParameterSet parameters, Destination finalDestination)Return a Receiver which can be used to supply the principal source document for the transformation.ValidationModegetSchemaValidationMode()Get the schema validation mode for the transformation.LoggergetTraceFunctionDestination()Get the destination for output from the fn:trace() function.TraceListenergetTraceListener()Get the TraceListener to be notified of all events occurring during the transformation.XsltControllergetUnderlyingController()Get the underlying Controller used to implement this XsltTransformer.javax.xml.transform.URIResolvergetURIResolver()Get the URI resolver.booleanisAssertionsEnabled()Ask whether assertions (xsl:assert instructions) have been enabled at run time.protected booleanisStreamableSource(javax.xml.transform.Source source)voidonClose(Action listener)Register a listener to be notified when aOutputterlinked to this destination is closed.voidsetAssertionsEnabled(boolean enabled)Say whether assertions (xsl:assert instructions) should be enabled at run time.voidsetBaseOutputURI(java.lang.String uri)Set the base output URI.voidsetDestination(Destination destination)Set the destination to be used for the result of the transformation.voidsetDestinationBaseURI(java.net.URI baseURI)Set the base URI of the resource being written to this destinationvoidsetErrorListener(javax.xml.transform.ErrorListener listener)Set the ErrorListener to be used during this transformationvoidsetErrorReporter(ErrorReporter reporter)Set a callback that will be used when reporting a dynamic error or warningvoidsetInitialContextNode(XdmNode node)Set the initial context node for the transformation.voidsetInitialMode(QName modeName)Set the initial mode for the transformationvoidsetInitialTemplate(QName templateName)Set the initial named template for the transformationvoidsetMessageListener(MessageListener listener)Deprecated.since 10.0 - usesetMessageListener(MessageListener2)voidsetMessageListener(MessageListener2 listener)Set the MessageListener to be notified whenever the stylesheet evaluates anxsl:messageinstruction.voidsetParameter(QName name, XdmValue value)Set the value of a stylesheet parameter.voidsetResultDocumentHandler(java.util.function.Function<java.net.URI,Destination> handler)Set a callback function that will be used whenxsl:result-documentis evaluated.voidsetSchemaValidationMode(ValidationMode mode)Set the schema validation mode for the transformation.voidsetSource(javax.xml.transform.Source source)Set the source document for the transformation.voidsetTraceFunctionDestination(Logger stream)Set the destination for output from the fn:trace() function.voidsetTraceListener(TraceListener listener)Set a TraceListener to be notified of all events occurring during the transformation.voidsetURIResolver(javax.xml.transform.URIResolver resolver)Set an object that will be used to resolve URIs used in fn:doc() and related functions.voidtransform()Perform the transformation.
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Field Detail
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processor
protected Processor processor
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controller
protected XsltController controller
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baseOutputUriWasSet
protected boolean baseOutputUriWasSet
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Constructor Detail
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XsltTransformer
protected XsltTransformer(Processor processor, XsltController controller, GlobalParameterSet staticParameters)
Protected constructor- Parameters:
processor- the S9API processorcontroller- the Saxon controller objectstaticParameters- the static parameters supplied at stylesheet compile time
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Method Detail
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setDestinationBaseURI
public void setDestinationBaseURI(java.net.URI baseURI)
Set the base URI of the resource being written to this destination- Specified by:
setDestinationBaseURIin interfaceDestination- Parameters:
baseURI- the base URI to be used
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getDestinationBaseURI
public java.net.URI getDestinationBaseURI()
Get the base URI of the resource being written to this destination- Specified by:
getDestinationBaseURIin interfaceDestination- Returns:
- the baseURI, or null if none is known
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onClose
public void onClose(Action listener)
Description copied from interface:DestinationRegister a listener to be notified when aOutputterlinked to this destination is closed.Example:
destination.onClose(() -> System.out.println("Finished writing to " + uri)The method must be called before the call on
Destination.getReceiver(PipelineConfiguration, SerializationProperties); the effect of calling it after getting aReceiver, but before closing theOutputter, is undefined.- Specified by:
onClosein interfaceDestination- Parameters:
listener- an object to be notified when writing to the destination is successfully completed
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closeAndNotify
public void closeAndNotify() throws SaxonApiExceptionDescription copied from interface:DestinationClose the destination and notify all registered listeners that it has been closed. This method is intended for internal use by Saxon. The method first callsDestination.close()to close the destination, then it callsConsumer.accept(T)on each of the listeners in turn to notify the fact that it has been closed.- Specified by:
closeAndNotifyin interfaceDestination- Throws:
SaxonApiException- if the close() method throwsSaxonApiException.
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setInitialTemplate
public void setInitialTemplate(QName templateName)
Set the initial named template for the transformation- Parameters:
templateName- the name of the initial template, or null to indicate that there should be no initial named template. Changed in 9.9: the method no longer checks that the named template exists.
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getInitialTemplate
public QName getInitialTemplate()
Get the initial named template for the transformation, if one has been set- Returns:
- the name of the initial template, or null if none has been set
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setSource
public void setSource(javax.xml.transform.Source source)
Set the source document for the transformation.If the source is an instance of
NodeInfo, the supplied node is used directly as the initial context item of the transformation.If the source is an instance of
DOMSource, the DOM node identified by the DOMSource is wrapped as a Saxon node, and this is then used as the context item.In other cases a new Saxon tree will be built by the transformation engine when the transformation starts, unless it is a Saxon-EE streaming transformation, in which case the document is processed in streaming fashion as it is being parsed.
To run a transformation in streaming mode, the source should be supplied as an instance of
StreamSourceorSAXSource.Some kinds of
Source(for exampleStreamSourceandSAXSourceare consumed by use; others (such asDOMSource) are immutable. In the general case, therefore, theSourceobject that is supplied by this method does not survive a call ontransform().- Parameters:
source- the principal source document for the transformation
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setInitialContextNode
public void setInitialContextNode(XdmNode node) throws SaxonApiUncheckedException
Set the initial context node for the transformation.In XSLT 3.0 terms, this sets the initial match selection (the sequence to which the initial implicit call of xsl:applyTemplates is applied). It also determines how the global context item for evaluating global variables is set: following the XSLT 1.0 and 2.0 rules (XSLT 2.0 section 9.5): "For a global variable or the default value of a stylesheet parameter, the expression or sequence constructor specifying the variable value is evaluated with a singleton focus based on the root node of the tree containing the initial context node."
This value is ignored in the case where the
XsltTransformeris used as theDestinationof another process. In that case the initial context node will always be the document node of the document that is being streamed to this destination.Calling this method has the side-effect of setting the initial source to null.
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node- the initial context node, or null if there is to be no initial context node- Throws:
SaxonApiUncheckedException- if the node is unsuitable, for example if it was built using the wrong Configuration
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getInitialContextNode
public XdmNode getInitialContextNode()
Get the initial context node for the transformation, if one has been set- Returns:
- the initial context node, or null if none has been set. This will not necessarily
be the same
XdmNodeinstance as was supplied, but it will be an XdmNode object that represents the same underlying node.
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setParameter
public void setParameter(QName name, XdmValue value)
Set the value of a stylesheet parameter.If the stylesheet does not have a parameter with this name, then the supplied value will simply be ignored (no error occurs)
If the stylesheet has a parameter with this name, and the supplied value does not match the required type, then no error will be reported at this stage, but a dynamic error will occur when the parameter value is first used. Supplied values are converted to the required type using the function conversion rules.
If the stylesheet has a parameter with this name, and the parameter is declared with
static="yes", or if a parameter with the same name was supplied to theXsltCompiler, then no error will be reported at this stage, but an error will be reported when the transformation is initiated. Static parameters must be initialized usingXsltCompiler.setParameter(QName, XdmValue).- Parameters:
name- the name of the stylesheet parameter, as a QNamevalue- the value of the stylesheet parameter, or null to clear a previously set value- Throws:
SaxonApiUncheckedException- if the value is lazily evaluated, and evaluation fails
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clearParameters
public void clearParameters()
Clear the values of all parameters that have been set
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getParameter
public XdmValue getParameter(QName name)
Get the value that has been set for a stylesheet parameter- Parameters:
name- the parameter whose name is required- Returns:
- the value that has been set for the parameter, or null if no value has been set
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setDestination
public void setDestination(Destination destination)
Set the destination to be used for the result of the transformation.This method can be used to chain transformations into a pipeline, by using one
XsltTransformeras the destination of anotherThe
Destinationobject will generally be modified by a transformation (that is, by a call ontransform()), and in general aDestinationcannot be used more than once. Therefore, if thisXsltTransformeris used for multiple transformations then a newDestinationshould be set for each one.- Parameters:
destination- the destination to be used for the result of this transformation
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getDestination
public Destination getDestination()
Get the destination that was specified in a previous call ofsetDestination(net.sf.saxon.s9api.Destination)- Returns:
- the destination, or null if none has been supplied
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transform
public void transform() throws SaxonApiExceptionPerform the transformation. If this method is used, a destination must have been supplied previously.Calling this method will in general consume any
SourceandDestinationthat have been supplied, so a newSourceandDestinationare needed for each transformation. Other properties of thisXsltTransformer(for example, the values of parameters, the initial template, and initial mode) are left unchanged after the transformation completes.If no source has been supplied (using
setSource(Source)), then the method looks to see whether an initial named template has been supplied (usingsetInitialTemplate(QName), and if so, the transformation starts with that named template. In the absence of an initial named template, it looks to see if the stylesheet includes a template namedxsl:initial-template, and if so, uses that as the entry point. If there is no source and no initial template, the method fails.- Throws:
SaxonApiException- if any dynamic error occurs during the transformationjava.lang.IllegalStateException- if no destination has been supplied
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getReceiver
public Receiver getReceiver(PipelineConfiguration pipe, SerializationProperties params) throws SaxonApiException
Return a Receiver which can be used to supply the principal source document for the transformation. This method is intended primarily for internal use, though it can also be called by a user application that wishes to feed events into the transformation engine.Saxon calls this method to obtain a Receiver, to which it then sends a sequence of events representing the content of an XML document. This method is provided so that
XsltTransformerimplementsDestination, allowing one transformation to receive the results of another in a pipeline.Before calling this method, the
setDestination(net.sf.saxon.s9api.Destination)method must be called to supply a destination for the transformation.Note that when an
XsltTransformeris used as aDestination, the initial context node set on thatXsltTransformerusingsetInitialContextNode(XdmNode)is ignored, as is the source set usingsetSource(javax.xml.transform.Source).- Specified by:
getReceiverin interfaceDestination- Parameters:
pipe- The Saxon configuration. This is supplied so that the destination can use information from the configuration (for example, a reference to the name pool) to construct or configure the returned Receiver.params- serialization parameters (not relevant here since we aren't serializing; except possibly for the item-separator property)- Returns:
- the Receiver to which events are to be sent.
- Throws:
SaxonApiException- if the Receiver cannot be createdjava.lang.IllegalStateException- if no Destination has been supplied
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close
public void close()
Close this destination, allowing resources to be released. Used when this XsltTransformer is acting as the destination of another transformation. Saxon calls this method when it has finished writing to the destination.- Specified by:
closein interfaceDestination
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setBaseOutputURI
public void setBaseOutputURI(java.lang.String uri)
Set the base output URI.This defaults to the base URI of the
Destinationfor the principal output of the transformation if a destination is supplied and its base URI is known.If a base output URI is supplied using this method then it takes precedence over any base URI defined in the supplied
Destinationobject, and it may cause the base URI of theDestinationobject to be modified in situ.The base output URI is used for resolving relative URIs in the
hrefattribute of thexsl:result-documentinstruction; it is accessible to XSLT stylesheet code using the XPathcurrent-output-uri()function- Parameters:
uri- the base output URI
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getBaseOutputURI
public java.lang.String getBaseOutputURI()
Get the base output URI.This returns the value set using the
setBaseOutputURI(java.lang.String)method. If no value has been set explicitly, then the method returns null if called before the transformation, or the computed default base output URI if called after the transformation.The base output URI is used for resolving relative URIs in the
hrefattribute of thexsl:result-documentinstruction.- Returns:
- the base output URI
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setURIResolver
public void setURIResolver(javax.xml.transform.URIResolver resolver)
Set an object that will be used to resolve URIs used in fn:doc() and related functions.- Parameters:
resolver- An object that implements the URIResolver interface, or null.
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getURIResolver
public javax.xml.transform.URIResolver getURIResolver()
Get the URI resolver.- Returns:
- the user-supplied URI resolver if there is one, or null otherwise
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setErrorListener
public void setErrorListener(javax.xml.transform.ErrorListener listener)
Set the ErrorListener to be used during this transformation- Parameters:
listener- The error listener to be used. This is notified of all dynamic errors detected during the transformation.
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getErrorListener
public javax.xml.transform.ErrorListener getErrorListener()
Get the ErrorListener being used during this transformation- Returns:
- listener The error listener in use. This is notified of all dynamic errors detected during the
transformation. If no user-supplied ErrorListener has been set the method will return a system-supplied
ErrorListener. If an explicit ErrorListener has been set using
setErrorListener(ErrorListener), then that ErrorListener will generally be returned, unless the internal ErrorListener has been changed by some other mechanism.
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setErrorReporter
public void setErrorReporter(ErrorReporter reporter)
Set a callback that will be used when reporting a dynamic error or warning
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getErrorReporter
public ErrorReporter getErrorReporter()
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setResultDocumentHandler
public void setResultDocumentHandler(java.util.function.Function<java.net.URI,Destination> handler)
Set a callback function that will be used whenxsl:result-documentis evaluated. The argument is a function that takes a URI as input (specifically, the value of thehrefargument toxsl:result-document, resolved against the base output URI of the transformation), and returns aDestination, which will be used as the destination for the result document.If the
hrefargument of thexsl:result-documentinstruction is absent or if it is set to a zero length string, then the callback function is not normally called; instead aReceiverfor the secondary output is obtained by making a second call onDestination.getReceiver(PipelineConfiguration, SerializationProperties)for the principal destination of the transformation. In that situation, this result document handler is invoked only if the call onDestination.getReceiver(PipelineConfiguration, SerializationProperties)returns null.If the base output URI is absent (perhaps because the principal output destination for the transformation was supplied as a
OutputStreamorWriterwith no associated URI or systemId), then the value of thehrefattribute is used as is if it is an absolute URI; if it is a relative URI (including the case where it is absent or zero-length) then the callback function is not called; instead a dynamic error is raised (codeSaxonErrorCode.SXRD0002).If the callback function throws a
SaxonApiUncheckedException, this will result in thexsl:result-documentinstruction failing with a dynamic error, which can be caught usingxsl:try/xsl:catch. The error code, by default, will be "err:SXRD0001".The application can request to be notified when the
Destinationis closed by setting aDestination.onClose(Action)callback on theDestinationobject.- Parameters:
handler- the callback function to be invoked whenever anxsl:result-documentinstruction is evaluated.
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setMessageListener
public void setMessageListener(MessageListener listener)
Deprecated.since 10.0 - usesetMessageListener(MessageListener2)Set the MessageListener to be notified whenever the stylesheet evaluates anxsl:messageinstruction. If no MessageListener is nominated, the output ofxsl:messageinstructions will be serialized and sent to the standard error stream.- Parameters:
listener- the MessageListener to be used
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setMessageListener
public void setMessageListener(MessageListener2 listener)
Set the MessageListener to be notified whenever the stylesheet evaluates anxsl:messageinstruction. If no MessageListener is nominated, the output ofxsl:messageinstructions will be serialized and sent to the standard error stream.The
MessageListener2interface differs fromMessageListenerin allowing the error code supplied to xsl:message to be notified.- Parameters:
listener- the MessageListener to be used
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getMessageListener
public MessageListener getMessageListener()
Get the MessageListener to be notified whenever the stylesheet evaluates anxsl:messageinstruction. If no MessageListener has been nominated, return null- Returns:
- the user-supplied MessageListener, or null if none has been supplied
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getMessageListener2
public MessageListener2 getMessageListener2()
Get the MessageListener2 to be notified whenever the stylesheet evaluates anxsl:messageinstruction. If no MessageListener2 has been nominated, return null- Returns:
- the user-supplied MessageListener2, or null if none has been supplied
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setAssertionsEnabled
public void setAssertionsEnabled(boolean enabled)
Say whether assertions (xsl:assert instructions) should be enabled at run time. By default they are disabled at compile time. If assertions are enabled at compile time, then by default they will also be enabled at run time; but they can be disabled at run time by specific request. At compile time, assertions can be enabled for some packages and disabled for others; at run-time, they can only be enabled or disabled globally.- Parameters:
enabled- true if assertions are to be enabled at run time; this has no effect if assertions were disabled (for a particular package) at compile time- Since:
- 9.7
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isAssertionsEnabled
public boolean isAssertionsEnabled()
Ask whether assertions (xsl:assert instructions) have been enabled at run time. By default they are disabled at compile time. If assertions are enabled at compile time, then by default they will also be enabled at run time; but they can be disabled at run time by specific request. At compile time, assertions can be enabled for some packages and disabled for others; at run-time, they can only be enabled or disabled globally.- Returns:
- true if assertions are enabled at run time
- Since:
- 9.7
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setTraceListener
public void setTraceListener(TraceListener listener)
Set a TraceListener to be notified of all events occurring during the transformation. This will only be effective if the stylesheet was compiled with trace code enabled (seeXsltCompiler.setCompileWithTracing(boolean))- Parameters:
listener- the TraceListener to be used. Note that the TraceListener has access to interal Saxon interfaces which may vary from one release to the next. It is also possible that the TraceListener interface itself may be changed in future releases.
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getTraceListener
public TraceListener getTraceListener()
Get the TraceListener to be notified of all events occurring during the transformation. If no TraceListener has been nominated, return null- Returns:
- the user-supplied TraceListener, or null if none has been supplied
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setTraceFunctionDestination
public void setTraceFunctionDestination(Logger stream)
Set the destination for output from the fn:trace() function. By default, the destination is System.err. If a TraceListener is in use, this is ignored, and the trace() output is sent to the TraceListener.- Parameters:
stream- the PrintStream to which trace output will be sent. If set to null, trace output is suppressed entirely. It is the caller's responsibility to close the stream after use.
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getTraceFunctionDestination
public Logger getTraceFunctionDestination()
Get the destination for output from the fn:trace() function.- Returns:
- the Logger to which trace output will be sent. If no explicitly destination has been set, returns System.err. If the destination has been set to null to suppress trace output, returns null.
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applyTemplatesToSource
protected void applyTemplatesToSource(javax.xml.transform.Source source, Receiver out) throws XPathException- Throws:
XPathException
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isStreamableSource
protected boolean isStreamableSource(javax.xml.transform.Source source)
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setSchemaValidationMode
public void setSchemaValidationMode(ValidationMode mode)
Set the schema validation mode for the transformation. This indicates how source documents loaded specifically for this transformation will be handled. This applies to the principal source document if supplied as a SAXSource or StreamSource, and to all documents loaded during the transformation using thedoc(),document(), orcollection()functions.- Parameters:
mode- the validation mode. Passing null causes no change to the existing value. PassingValidationMode.DEFAULTresets to the initial value, which determines the validation requirements from the Saxon Configuration.
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getSchemaValidationMode
public ValidationMode getSchemaValidationMode()
Get the schema validation mode for the transformation. This indicates how source documents loaded specifically for this transformation will be handled. This applies to the principal source document if supplied as a SAXSource or StreamSource, and to all documents loaded during the transformation using thedoc(),document(), orcollection()functions.- Returns:
- the validation mode.
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setInitialMode
public void setInitialMode(QName modeName) throws java.lang.IllegalArgumentException
Set the initial mode for the transformation- Parameters:
modeName- the name of the initial mode. Two special values are recognized, in the reserved XSLT namespace: xsl:unnamed to indicate the mode with no name, and xsl:default to indicate the mode defined in the stylesheet header as the default mode. The value null also indicates the default mode (which defaults to the unnamed mode, but can be set differently in an XSLT 3.0 stylesheet).- Throws:
java.lang.IllegalArgumentException- if the requested mode is not defined in the stylesheet- Since:
- changed in 9.6 to throw an exception if the mode is not defined in the stylesheet. Chaned in 9.7 so that null means the default mode, not necessarily the unnamed mode.
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getInitialMode
public QName getInitialMode()
Get the name of the initial mode for the transformation, if one has been set.- Returns:
- the initial mode for the transformation. Returns null if no mode has been set, or if the mode was set to null to represent the default (unnamed) mode
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getUnderlyingController
public XsltController getUnderlyingController()
Get the underlying Controller used to implement this XsltTransformer. This provides access to lower-level methods not otherwise available in the s9api interface. Note that classes and methods obtained by this route cannot be guaranteed stable from release to release.- Returns:
- the underlying
Controller
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getDestinationReceiver
public Receiver getDestinationReceiver(XsltController controller, Destination destination) throws SaxonApiException
Get a Receiver corresponding to the chosen Destination for the transformation- Parameters:
destination- the destination for the results of this transformation- Returns:
- a receiver that sends the results to this destination
- Throws:
SaxonApiException- if anything goes wrong
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getReceivingTransformer
protected Receiver getReceivingTransformer(XsltController controller, GlobalParameterSet parameters, Destination finalDestination) throws SaxonApiException
Return a Receiver which can be used to supply the principal source document for the transformation. This method is intended primarily for internal use, though it can also be called by a user application that wishes to feed events into the transformation engine.Saxon calls this method to obtain a Receiver, to which it then sends a sequence of events representing the content of an XML document. This method is provided so that
XsltTransformerimplementsDestination, allowing one transformation to receive the results of another in a pipeline.- Returns:
- the Receiver to which events are to be sent.
- Throws:
SaxonApiException- if the Receiver cannot be createdjava.lang.IllegalStateException- if no Destination has been supplied
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