net.sf.saxon.functions
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:

Container, Expression, InstructionInfoProvider, java.io.Serializable, javax.xml.transform.SourceLocator

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

static int	DAY
static int	HOURS
static int	LOCALNAME
static int	MICROSECONDS
static int	MINUTES
static int	MONTH
static int	NAMESPACE
static int	PREFIX
static int	SECONDS
static int	TIMEZONE
static int	YEAR

Fields inherited from class net.sf.saxon.functions.SystemFunction

operation

Fields inherited from class net.sf.saxon.expr.FunctionCall

argument

Fields inherited from class net.sf.saxon.expr.ComputedExpression

locationId, staticProperties

Fields inherited from interface net.sf.saxon.expr.Expression

EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD

Constructor Summary

Component()

Method Summary

Item	evaluateItem(XPathContext context) Evaluate the expression
Expression	simplify(StaticContext env) Simplify the function call.

Methods inherited from class net.sf.saxon.functions.SystemFunction

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

Methods inherited from class net.sf.saxon.expr.FunctionCall

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

Methods inherited from class net.sf.saxon.expr.ComputedExpression

adoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, 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, suppressValidation, typeError, typeError

Methods inherited from class java.lang.Object

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

Field Detail

YEAR

public static final int YEAR

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Constant Field Values

MONTH

public static final int MONTH

See Also:

Constant Field Values

DAY

public static final int DAY

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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

Constructor Detail

Component

public Component()

Method Detail

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

Throws:

XPathException

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