net.sf.saxon.expr.parser

Class ContextItemStaticInfo

java.lang.Object

net.sf.saxon.expr.parser.ContextItemStaticInfo

public class ContextItemStaticInfo
extends Object

A data structure that represents the required type of the context item, together with information about whether it is known to be present or absent or whether it is not known statically whether it is present or absent.

Field Summary

Fields

Modifier and Type	Field and Description
static ContextItemStaticInfo	ABSENT
static ContextItemStaticInfo	DEFAULT Default information when nothing else is known

Constructor Summary

Constructors

Constructor and Description
ContextItemStaticInfo(ItemType itemType, boolean maybeUndefined) Create a ContextItemStaticInfo

Method Summary

Modifier and Type	Method and Description
UType	getContextItemUType() Get the static type of the context item as a UType
Expression	getContextSettingExpression()
ItemType	getItemType() Get the static type of the context item.
boolean	isPossiblyAbsent() Ask whether it is possible that the context item is absent
boolean	isStrictStreamabilityRules()
void	setContextPostureGrounded() Set streaming posture.
void	setContextPostureStriding() Set streaming posture.
void	setContextSettingExpression(Expression setter)

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT

public static final ContextItemStaticInfo DEFAULT

Default information when nothing else is known

ABSENT

public static final ContextItemStaticInfo ABSENT

Constructor Detail

ContextItemStaticInfo

public ContextItemStaticInfo(ItemType itemType,
                             boolean maybeUndefined)

Create a ContextItemStaticInfo

Parameters:

itemType - the item type of the context item. If the context item is absent, set this to ErrorType.getInstance().

maybeUndefined - set to true if it is possible (or certain) that the context item will be absent.

Method Detail

setContextSettingExpression

public void setContextSettingExpression(Expression setter)

getContextSettingExpression

public Expression getContextSettingExpression()

getItemType

public ItemType getItemType()

Get the static type of the context item. If the context item is known to be undefined, the returned value is

Returns:

the static context item type

getContextItemUType

public UType getContextItemUType()

Get the static type of the context item as a UType

Returns:

the static context item type

isPossiblyAbsent

public boolean isPossiblyAbsent()

Ask whether it is possible that the context item is absent

Returns:

true if the context item might be absent

setContextPostureStriding

public void setContextPostureStriding()

Set streaming posture. The Saxon-HE version of this method has no effect.

setContextPostureGrounded

public void setContextPostureGrounded()

Set streaming posture. The Saxon-HE version of this method has no effect.

isStrictStreamabilityRules

public boolean isStrictStreamabilityRules()