net.sf.saxon.query
Class DynamicQueryContext

java.lang.Object
  net.sf.saxon.query.DynamicQueryContext

public class DynamicQueryContext
extends Object

This object represents a dynamic context for query execution. This class is used by the application writer to set up aspects of the dynamic context; it is not used operationally (or modified) by the XQuery processor itself, which copies all required information into its own internal representation.

Constructor Summary

DynamicQueryContext(Configuration config)
Create the dynamic context for a query

Method Summary

void	clearParameters() Reset the parameters to an empty list.
Configuration	getConfiguration() Get the Configuration associated with this dynamic query context
Item	getContextItem() Get the context item for the query, as set using setContextItem() or setContextNode().
DateTimeValue	getCurrentDateTime() Get the date and time set previously using setCurrentDateTime(net.sf.saxon.value.DateTimeValue) or null if none has been set.
ErrorListener	getErrorListener() Get the error listener.
Object	getParameter(String expandedName) Get the actual value of a parameter to the query.
HashMap	getParameters() Get all the supplied parameters as a HashMap.
TraceListener	getTraceListener() Get the trace listener.
URIResolver	getURIResolver() Get the URI resolver.
void	setContextItem(Item item) Set the context item for evaluating the expression.
void	setContextNode(NodeInfo node) Deprecated. From Saxon 8.7, the method setContextItem(Item) is preferred
void	setCurrentDateTime(DateTimeValue dateTime) Set a value to be used as the current date and time for the query.
void	setErrorListener(ErrorListener listener) Set the error listener.
void	setParameter(String expandedName, Object value) Set a parameter for the query.
void	setParameterValue(String expandedName, ValueRepresentation value) Set a parameter for the query.
void	setTraceListener(TraceListener listener) Set the trace listener.
void	setURIResolver(URIResolver resolver) Set an object that will be used to resolve URIs used in fn:document() and related functions.

Methods inherited from class java.lang.Object

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

Constructor Detail

DynamicQueryContext

public DynamicQueryContext(Configuration config)

Create the dynamic context for a query

Parameters:

config - the Saxon configuration

Method Detail

setContextNode

public void setContextNode(NodeInfo node)

Deprecated. From Saxon 8.7, the method setContextItem(Item) is preferred

Set the context item for evaluating the expression to be a node. If this method is not called, the context node will be undefined. The context node is available as the value of the expression ".". To obtain a NodeInfo by parsing a source document, see the method buildDocument in class QueryProcessor.

Parameters:

node - The node that is to be the context node for the query

Since:

8.4

setContextItem

public void setContextItem(Item item)

Set the context item for evaluating the expression. If this method is not called, the context node will be undefined. The context item is available as the value of the expression ".",. To obtain a node by parsing a source document, see the method buildDocument in class QueryProcessor.

Parameters:

item - The item that is to be the context item for the query

Throws:

IllegalArgumentException - if the supplied item is a node that was built under the wrong Saxon Configuration

Since:

8.4

getContextItem

public Item getContextItem()

Get the context item for the query, as set using setContextItem() or setContextNode().

Returns:

the context item if set, or null otherwise.

Since:

8.4

setParameter

public void setParameter(String expandedName,
                         Object value)

Set a parameter for the query.

Parameters:

expandedName - The name of the parameter in "{uri}local-name" format. It is not an error to supply a value for a parameter that has not been declared, the parameter will simply be ignored. If the parameter has been declared in the query (as an external global variable) then it will be initialized with the value supplied.

value - The value of the parameter. This can be any valid Java object. It follows the same conversion rules as a value returned from a Saxon extension function. An error will occur at query execution time if the supplied value cannot be converted to the required type as declared in the query. For precise control of the type of the value, instantiate one of the classes in the net.sf.saxon.value package, for example net.sf.saxon.value.DayTimeDuration.

Since:

8.4

setParameterValue

public void setParameterValue(String expandedName,
                              ValueRepresentation value)

Set a parameter for the query.

Parameters:

expandedName - The name of the parameter in "{uri}local-name" format. It is not an error to supply a value for a parameter that has not been declared, the parameter will simply be ignored. If the parameter has been declared in the query (as an external global variable) then it will be initialized with the value supplied.

value - The value of the parameter. This must be an XPath value in its Saxon representation: no conversion occurs.

Since:

8.8

clearParameters

public void clearParameters()

Reset the parameters to an empty list.

getParameter

public Object getParameter(String expandedName)

Get the actual value of a parameter to the query.

Parameters:

expandedName - the name of the required parameter, in "{uri}local-name" format

Returns:

the value of the parameter, if it exists, or null otherwise

getParameters

public HashMap getParameters()

Get all the supplied parameters as a HashMap. The key is the expanded QName in Clark notation, the value is the value as supplied to setParameterValue

Returns:

a HashMap containing all the parameters

setURIResolver

public void setURIResolver(URIResolver resolver)

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

Parameters:

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

Since:

8.4

getURIResolver

public URIResolver getURIResolver()

Get the URI resolver.

Returns:

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

Since:

8.4

setErrorListener

public void setErrorListener(ErrorListener listener)

Set the error listener. The error listener receives reports of all run-time errors and can decide how to report them.

Parameters:

listener - the ErrorListener to be used

Since:

8.4

getErrorListener

public ErrorListener getErrorListener()

Get the error listener.

Returns:

the ErrorListener in use

Since:

8.4

setTraceListener

public void setTraceListener(TraceListener listener)

Set the trace listener. The trace listener receives reports of all run-time expression evaluation.

Parameters:

listener - the TraceListener to be used

Since:

9.0

getTraceListener

public TraceListener getTraceListener()

Get the trace listener.

Returns:

the TraceListener in use, or null if none is in use

Since:

9.0

getCurrentDateTime

public DateTimeValue getCurrentDateTime()

Get the date and time set previously using setCurrentDateTime(net.sf.saxon.value.DateTimeValue) or null if none has been set.

Returns:

the current date and time, if it has been set.

Since:

8.5

setCurrentDateTime

public void setCurrentDateTime(DateTimeValue dateTime)
                        throws XPathException

Set a value to be used as the current date and time for the query. By default, the "real" current date and time are used. The main purpose of this method is that it allows repeatable results to be achieved when testing queries

Parameters:

dateTime - The value to be used as the current date and time. This must include a timezone. The timezone from this value will also be used as the implicit timezone

Throws:

XPathException

Since:

8.5

getConfiguration

public Configuration getConfiguration()

Get the Configuration associated with this dynamic query context

Returns:

the Configuration

Since:

8.8