net.sf.saxon.functions

Class AccessorFn

java.lang.Object

net.sf.saxon.expr.Expression

net.sf.saxon.expr.FunctionCall

net.sf.saxon.functions.SystemFunctionCall

net.sf.saxon.functions.AccessorFn

All Implemented Interfaces:

SourceLocator, Callable, IdentityComparable, InstructionInfo

public class AccessorFn
extends SystemFunctionCall

This class supports the get_X_from_Y functions defined in XPath 2.0

Field Summary

Fields

Modifier and Type	Field and Description
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	WHOLE_SECONDS
static int	YEAR
static int	YEAR_ALLOWING_ZERO

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

operation

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

argument

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

EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, WATCH_METHOD

Constructor Summary

Constructors

Constructor and Description
AccessorFn()

Method Summary

Methods

Modifier and Type	Method and Description
AtomicValue	call(XPathContext context, Sequence[] arguments) Evaluate the expression
Expression	copy() Copy an expression.
AtomicValue	evaluateItem(XPathContext context) Evaluate the expression
ExpressionCompiler	getExpressionCompiler() Return the compiler of the Component expression
IntegerValue[]	getIntegerBounds() For an expression that returns an integer or a sequence of integers, get a lower and upper bound on the values of the integers that may be returned, from static analysis.
int	getRequiredComponent() Get the required component
String	getRequiredComponentAsString() Get the required component name as a string
void	setDetails(StandardFunction.Entry entry) Set the details of this type of function

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

addContextDocumentArgument, addDocToPathMap, bindStaticContext, checkArguments, computeCardinality, computeSpecialProperties, equalOrNull, equals, getContextNode, getConvertingCallable, getDefaultArgumentNode, getDetails, getErrorCodeForTypeErrors, getFunctionItemType, getImplementationMethod, getItemType, getOperation, getRequiredType, makeSystemFunction, operands, optimize, toShortString, useContextItemAsDefault

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

addExternalFunctionCallToPathMap, checkArgumentCount, explain, getArguments, getDisplayName, getExpressionName, getFunctionName, getNumberOfArguments, hashCode, preEvaluate, promote, replaceOperand, setArguments, setFunctionName, simplifyArguments, toString, typeCheck

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

addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, clearStreamabilityData, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getConfiguration, getConstructType, getContainer, getDependencies, getEvaluationMethod, getHostLanguage, getIntrinsicDependencies, getLineNumber, getLocationId, getObjectName, getPosture, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getStreamability, getStreamingAdjunct, getSweep, getSystemId, hasVariableBinding, identityHashCode, implementsStaticTypeCheck, isIdentical, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, iterateEvents, makeStreamingAdjunct, markTailFunctionCalls, operandList, process, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, setPostureAndSweep, simplify, staticTypeCheck, suppressValidation, toPattern, toStreamingPattern, typeError, unordered

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

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

YEAR_ALLOWING_ZERO

public static final int YEAR_ALLOWING_ZERO

See Also:

Constant Field Values

Constructor Detail

AccessorFn

public AccessorFn()

Method Detail

setDetails

public void setDetails(StandardFunction.Entry entry)

Set the details of this type of function

Overrides:

setDetails in class SystemFunctionCall

Parameters:

entry - information giving details of the function signature

getIntegerBounds

public IntegerValue[] getIntegerBounds()

For an expression that returns an integer or a sequence of integers, get a lower and upper bound on the values of the integers that may be returned, from static analysis. The default implementation returns null, meaning "unknown" or "not applicable". Other implementations return an array of two IntegerValue objects, representing the lower and upper bounds respectively. The values UNBOUNDED_LOWER and UNBOUNDED_UPPER are used by convention to indicate that the value may be arbitrarily large. The values MAX_STRING_LENGTH and MAX_SEQUENCE_LENGTH are used to indicate values limited by the size of a string or the size of a sequence.

Overrides:

getIntegerBounds in class Expression

Returns:

the lower and upper bounds of integer values in the result, or null to indicate unknown or not applicable.

getRequiredComponent

public int getRequiredComponent()

Get the required component

Returns:

the integer code identifying of the required component

getRequiredComponentAsString

public String getRequiredComponentAsString()

Get the required component name as a string

Returns:

the name of the required component

evaluateItem

public AtomicValue evaluateItem(XPathContext context)
                         throws XPathException

Evaluate the expression

Overrides:

evaluateItem in class Expression

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

copy

public Expression copy()

Copy an expression. This makes a deep copy.

Overrides:

copy in class SystemFunctionCall

Returns:

the copy of the original expression

call

public AtomicValue call(XPathContext context,
               Sequence[] arguments)
                 throws XPathException

Evaluate the expression

Parameters:

context - the dynamic evaluation context

arguments - the values of the arguments, supplied as Sequences

Returns:

the result of the evaluation, always an atomic value

Throws:

XPathException - if a dynamic error occurs during the evaluation of the expression

getExpressionCompiler

public ExpressionCompiler getExpressionCompiler()

Return the compiler of the Component expression

Overrides:

getExpressionCompiler in class Expression

Returns:

the relevant ExpressionCompiler