XQueryProcessor Class Reference

#include <XQueryProcessor.h>

Public Member Functions
	XQueryProcessor ()
	Default constructor.
	XQueryProcessor (SaxonProcessor *p, std::string cwd="")
	Constructor with the SaxonProcessor supplied.
	XQueryProcessor (const XQueryProcessor &other)
XQueryProcessor *	clone ()
void	setContextItem (XdmItem *value)
	Set the initial context item for the query.
void	setOutputFile (const char *outfile)
void	setContextItemFromFile (const char *filename)
void	setParameter (const char *name, XdmValue *value)
bool	removeParameter (const char *name)
	Remove a parameter (name, value) pair.
void	setProperty (const char *name, const char *value)
	Set a property specific to the processor in use.
void	clearParameters (bool deleteValues=false)
	Clear parameter values set.
void	clearProperties ()
	Clear property values set.
void	setUpdating (bool updating)
	Say whether the query is allowed to be updating.
void	executeQueryToFile (const char *infilename, const char *ofilename, const char *query)
	Perform the Query to file.
XdmValue *	executeQueryToValue (const char *infilename, const char *query)
	Perform the Query to a XdmValue representation.
const char *	executeQueryToString (const char *infilename, const char *query)
	Perform the Query to a string representation.
XdmValue *	runQueryToValue ()
	Execute the Query cached.
const char *	runQueryToString ()
void	runQueryToFile ()
	Execute the Query cached to file.
void	declareNamespace (const char *prefix, const char *uri)
	Declare a namespace binding.
std::map< std::string, XdmValue * > &	getParameters ()
	Get all parameters as a std::map.
std::map< std::string, std::string > &	getProperties ()
	Get all properties as a std::map.
void	setQueryFile (const char *filename)
	Compile a query supplied as a file name.
void	setQueryContent (const char *content)
	Compile a query supplied as a string.
void	setQueryBaseURI (const char *baseURI)
	Set the static base URI for the query.
void	setcwd (const char *cwd)
const char *	checkException ()
	Check for exception thrown.
bool	exceptionOccurred ()
void	exceptionClear ()
	Clear any exception thrown.
const char *	getErrorMessage ()
	Get the first error message if there are any errors.
const char *	getErrorCode ()
	Get the first error code if there are any errors.
SaxonApiException *	getException ()
	Get the SaxonApiException object created when we have an error.

Detailed Description

An XQueryProcessor represents a factory to compile, load and execute queries.

Constructor & Destructor Documentation

XQueryProcessor() [1/2]

XQueryProcessor::XQueryProcessor	(	SaxonProcessor *	p,
		std::string	cwd = ""
	)

Constructor with the SaxonProcessor supplied.

Parameters

p	- Supplied pointer to the SaxonProcessor object
cwd	- set the current working directory. Default is the empty string

XQueryProcessor() [2/2]

XQueryProcessor::XQueryProcessor

(

const XQueryProcessor &

other

)

XQueryProcessor copy constructor.

Parameters

other

- XQueryProcessor

Member Function Documentation

checkException()

const char * XQueryProcessor::checkException

(

)

Check for exception thrown.

Returns

char*. Returns the main exception message if thrown otherwise return nullptr

clearParameters()

void XQueryProcessor::clearParameters

(

bool

deleteValues = false

)

Clear parameter values set.

Default behaviour (false) is to leave XdmValues in memory. Individual pointers to XdmValue objects have to be deleted in the calling program.

Parameters

deleteValues

- if true then XdmValues are deleted

clone()

XQueryProcessor * XQueryProcessor::clone

(

)

Clone the XQueryProcessor with the same internal state, which can be used in separate threads.

declareNamespace()

void XQueryProcessor::declareNamespace	(	const char *	prefix,
		const char *	uri
	)

Declare a namespace binding.

Declare a namespace binding as part of the static context for queries compiled using this XQueryCompiler. This binding may be overridden by a binding that appears in the query prolog. The namespace binding will form part of the static context of the query, but it will not be copied into result trees unless the prefix is actually used in an element or attribute name.

Parameters

prefix	The namespace prefix. If the value is a zero-length string, this method sets the default namespace for elements and types.
uri	The namespace URI. It is possible to specify a zero-length string to "undeclare" a namespace; in this case the prefix will not be available for use, except in the case where the prefix is also a zero length string, in which case the absence of a prefix implies that the name is in no namespace. Assume the prefix or uri is nullptr.

exceptionOccurred()

bool XQueryProcessor::exceptionOccurred

(

)

Checks for pending exceptions without creating a local reference to the exception object

Returns

bool - true when there is a pending exception; otherwise return false

executeQueryToFile()

void XQueryProcessor::executeQueryToFile	(	const char *	infilename,
		const char *	ofilename,
		const char *	query
	)

Perform the Query to file.

The result is is saved to file

Parameters

infilename	- The file name of the source document
ofilename	- The file name of where result will be stored
query	- The query as string representation. TODO check

executeQueryToString()

const char * XQueryProcessor::executeQueryToString	(	const char *	infilename,
		const char *	query
	)

Perform the Query to a string representation.

Parameters

infilename	- The file name of the source document
query	- The query as string representation

Returns

char array - result of as a string

executeQueryToValue()

XdmValue * XQueryProcessor::executeQueryToValue	(	const char *	infilename,
		const char *	query
	)

Perform the Query to a XdmValue representation.

Parameters

infilename	- The file name of the source document
query	- The query as string representation

Returns

XdmValue - result of the the query as a XdmValue

getErrorCode()

const char * XQueryProcessor::getErrorCode

(

)

Get the first error code if there are any errors.

After the execution of the query there may be a number of errors reported against it.

Returns

char* - The error code of the exception.

getErrorMessage()

const char * XQueryProcessor::getErrorMessage

(

)

Get the first error message if there are any errors.

A query may have a number of errors reported against it.

Returns

char* - The message of the exception

getException()

SaxonApiException * XQueryProcessor::getException

(

)

Get the SaxonApiException object created when we have an error.

After the execution of the processor if there is an error, then a SaxonApiException is created. NULL returned if there is no error.

Returns

SaxonApiException object of the exception thrown.

getParameters()

std::map< std::string, XdmValue * > & XQueryProcessor::getParameters

(

)

Get all parameters as a std::map.

Returns

std::map - map of the parameters string->XdmValue*

getProperties()

std::map< std::string, std::string > & XQueryProcessor::getProperties

(

)

Get all properties as a std::map.

Returns

std::map map of the properties string->string

removeParameter()

bool XQueryProcessor::removeParameter

(

const char *

name

)

Remove a parameter (name, value) pair.

Parameters

name	of the parameter

Returns

bool - outcome of the removal

Remove a parameter (name, value) pair

runQueryToFile()

void XQueryProcessor::runQueryToFile

(

)

Execute the Query cached to file.

The use of the context item would have had to be set in advance Assume the output filename has been set in advance

runQueryToString()

const char * XQueryProcessor::runQueryToString

(

)

Execute the Query cached. The use of the context item would have had to be set in advance

Returns

Result as a string (i.e. pointer array of char)

runQueryToValue()

XdmValue * XQueryProcessor::runQueryToValue

(

)

Execute the Query cached.

The use of the context item would have had to be set in advance

Returns

XdmValue of the result

setContextItem()

void XQueryProcessor::setContextItem

(

XdmItem *

value

)

Set the initial context item for the query.

Parameters

value

- the initial context item, or nullptr if there is to be no initial context item

Set the source document for the query

setContextItemFromFile()

void XQueryProcessor::setContextItemFromFile

(

const char *

ifile

)

Set the source from file for the query.

Set the source document for the query

setcwd()

void XQueryProcessor::setcwd

(

const char *

cwd

)

set the current working directory

setOutputFile()

void XQueryProcessor::setOutputFile

(

const char *

ofile

)

Set the output file where the result is sent

setParameter()

void XQueryProcessor::setParameter	(	const char *	name,
		XdmValue *	value
	)

Set a parameter value used in the query

Parameters

name	of the parameter, as a string. For namespaced parameter use the JAXP solution i.e. "{uri}name"
value	of the query parameter, or nullptr to clear a previously set value

Set a parameter value used in the query

setProperty()

void XQueryProcessor::setProperty	(	const char *	name,
		const char *	value
	)

Set a property specific to the processor in use.

XQueryProcessor: set serialization properties (names start with '!' i.e. name "!method" -> "xml") 'o':outfile name, 's': source as file name 'q': query file name, 'q': current by name, 'qs': string form of the query, 'base': set the base URI of the query, 'dtd': set DTD validation 'on' or 'off'

Parameters

name	of the property
value	of the property

Set a property.

setQueryBaseURI()

void XQueryProcessor::setQueryBaseURI

(

const char *

baseURI

)

Set the static base URI for the query.

Parameters

baseURI

the static base URI; or nullptr to indicate that no base URI is available

setQueryContent()

void XQueryProcessor::setQueryContent

(

const char *

content

)

Compile a query supplied as a string.

The supplied query is cached for later execution.

setQueryFile()

void XQueryProcessor::setQueryFile

(

const char *

filename

)

Compile a query supplied as a file name.

The supplied query is cached for later execution.

setUpdating()

void XQueryProcessor::setUpdating

(

bool

updating

)

Say whether the query is allowed to be updating.

XQuery update syntax will be rejected during query compilation unless this flag is set. XQuery Update is supported only under Saxon-EE.

Parameters

updating

- true if the query is allowed to use the XQuery Update facility (requires Saxon-EE). If set to false, the query must not be an updating query. If set to true, it may be either an updating or a non-updating query.

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The documentation for this class was generated from the following files:

• Saxon.C.API/XQueryProcessor.h
• Saxon.C.API/XQueryProcessor.cpp