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
ContextItemStaticInfo(ItemType itemType, boolean maybeUndefined, boolean isStriding) Create a ContextItemStaticInfo
ContextItemStaticInfo(ItemType itemType, boolean maybeUndefined, Expression contextSettingExpression) Create a ContextItemStaticInfo
ContextItemStaticInfo(ItemType itemType, boolean maybeUndefined, Posture contextItemPosture) Create a ContextItemStaticInfo

Method Summary

Methods

Modifier and Type	Method and Description
Posture	getContextItemPosture() Get the context item posture
ItemType	getItemType() Get the static type of the context item.
boolean	isPossiblyAbsent() Ask whether it is possible that the context item is absent
void	setContextPostureStriding()

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.

ContextItemStaticInfo

public ContextItemStaticInfo(ItemType itemType,
                     boolean maybeUndefined,
                     Expression contextSettingExpression)

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.

contextSettingExpression - The expression that controls the context item.

ContextItemStaticInfo

public ContextItemStaticInfo(ItemType itemType,
                     boolean maybeUndefined,
                     boolean isStriding)

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.

isStriding - True if the explicit posture is Striding (otherwise Roaming).

ContextItemStaticInfo

public ContextItemStaticInfo(ItemType itemType,
                     boolean maybeUndefined,
                     Posture contextItemPosture)

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.

contextItemPosture - the context item posture.

Method Detail

setContextPostureStriding

public void setContextPostureStriding()

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

isPossiblyAbsent

public boolean isPossiblyAbsent()

Ask whether it is possible that the context item is absent

Returns:

true if the context item might be absent

getContextItemPosture

public Posture getContextItemPosture()

Get the context item posture

Returns:

the posture of the expression that sets the context item