Class Component

java.lang.Object

net.sf.saxon.expr.ComputedExpression

net.sf.saxon.expr.FunctionCall

net.sf.saxon.functions.SystemFunction

net.sf.saxon.functions.Component

All Implemented Interfaces:

Serializable, SourceLocator, Container, Expression, InstructionInfoProvider

public class Component
extends SystemFunction

This class supports the get_X_from_Y functions defined in XPath 2.0

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
(package private) int	component
static final int	DAY
static final int	HOURS
static final int	LOCALNAME
static final int	MICROSECONDS
static final int	MINUTES
static final int	MONTH
static final int	NAMESPACE
static final int	PREFIX
static final int	SECONDS
static final int	TIMEZONE
static final int	WHOLE_SECONDS
static final int	YEAR

Fields inherited from class SystemFunction

operation

Fields inherited from class FunctionCall

argument

Fields inherited from class ComputedExpression

locationId, staticProperties

Fields inherited from interface Expression

EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD

Constructor Summary

Constructors

Constructor	Description
Component()

Method Summary

Modifier and Type	Method	Description
Item	evaluateItem(XPathContext context)	Evaluate the expression
Expression	simplify(StaticContext env)	Simplify the function call.

Methods inherited from class SystemFunction

addContextDocumentArgument, checkArguments, computeCardinality, computeSpecialProperties, display, getDetails, getErrorCodeForTypeErrors, getItemType, getRequiredType, main, makeSystemFunction, setDetails, useContextItemAsDefault

Methods inherited from class FunctionCall

checkArgumentCount, getArguments, getDisplayName, getFunctionNameCode, getNumberOfArguments, iterateSubExpressions, optimize, preEvaluate, promote, replaceSubExpression, setArguments, setFunctionNameCode, simplifyArguments, typeCheck

Methods inherited from class ComputedExpression

adoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, getCardinality, getColumnNumber, getConstructType, getDependencies, getExecutable, getHostLanguage, getImplementationMethod, getInstructionInfo, getIntrinsicDependencies, getLineNumber, getLocationId, getLocationProvider, getParentExpression, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasBadParentPointer, iterate, markTailFunctionCalls, process, resetStaticProperties, setLocationId, setParentExpression, setParentExpression, suppressValidation, typeError

Methods inherited from class Object

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

Field Details

YEAR

public static final int YEAR

See Also:

• Constant Field Values

MONTH

public static final int MONTH

See Also:

• Constant Field Values

DAY

public static final int DAY

See Also:

• Constant Field Values

HOURS

public static final int HOURS

See Also:

• Constant Field Values

MINUTES

public static final int MINUTES

See Also:

• Constant Field Values

SECONDS

public static final int SECONDS

See Also:

• Constant Field Values

TIMEZONE

public static final int TIMEZONE

See Also:

• Constant Field Values

LOCALNAME

public static final int LOCALNAME

See Also:

• Constant Field Values

NAMESPACE

public static final int NAMESPACE

See Also:

• Constant Field Values

PREFIX

public static final int PREFIX

See Also:

• Constant Field Values

MICROSECONDS

public static final int MICROSECONDS

See Also:

• Constant Field Values

WHOLE_SECONDS

public static final int WHOLE_SECONDS

See Also:

• Constant Field Values

component

int component

Constructor Details

Component

public Component()

Method Details

simplify

public Expression simplify(StaticContext env)
                    throws XPathException

Description copied from class: FunctionCall

Simplify the function call. Default method is to simplify each of the supplied arguments and evaluate the function if all are now known.

Specified by:

simplify in interface Expression

Overrides:

simplify in class FunctionCall

Parameters:

env - the static context

Returns:

the simplified expression

Throws:

XPathException - if an error is discovered during expression rewriting

evaluateItem

public Item evaluateItem(XPathContext context)
                  throws XPathException

Evaluate the expression

Specified by:

evaluateItem in interface Expression

Overrides:

evaluateItem in class ComputedExpression

Parameters:

context - The context in which the expression is to be evaluated

Returns:

the node or atomic value that results from evaluating the expression; or null to indicate that the result is an empty sequence

Throws:

XPathException - if any dynamic error occurs evaluating the expression