Package net.sf.saxon.functions

Class SubstringBefore

java.lang.Object

net.sf.saxon.functions.AbstractFunction

net.sf.saxon.functions.SystemFunction

net.sf.saxon.functions.CollatingFunctionFixed

net.sf.saxon.functions.SubstringBefore

All Implemented Interfaces:

Callable, StatefulSystemFunction, FunctionItem, GroundedValue, Item, Sequence

public class SubstringBefore
extends CollatingFunctionFixed

Implements the fn:substring-before() function with the collation already known

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	SubstringBefore.SubstringBeforeFnElaborator

Constructor Summary

Constructors

Constructor	Description
SubstringBefore()

Method Summary

Modifier and Type	Method	Description
StringValue	call(XPathContext context, Sequence[] arguments)	Evaluate the expression
Elaborator	getElaborator()	Make an elaborator for a system function call on this function
boolean	isSubstringMatchingFunction()	Ask whether this function needs a collation that can handle substring matching

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

copy, exportAttributes, getAtomicComparer, getPreAllocatedAtomicComparer, getStringCollator, importAttributes, preAllocateComparer, setCollationName, setRetainedStaticContext

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

dependsOnContextItem, dynamicCall, equals, export, exportAdditionalArguments, fixArguments, getArity, getCardinality, getContextNode, getDescription, getDetails, getErrorCodeForTypeErrors, getFunctionItemType, getFunctionName, getIntegerBounds, getNetCost, getOperandRoles, getRequiredType, getResultItemType, getResultItemType, getRetainedStaticContext, getSpecialProperties, getStaticBaseUriString, getStreamerName, getUniStringArg, hashCode, isSequenceVariadic, isTrustedResultType, makeCall, makeFunction, makeFunction40, makeFunctionCall, makeOptimizedFunctionCall, resultIfEmpty, setArity, setDetails, supplyTypeInformation, toShortString, toString, typeCheckCaller

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

atomize, deepEqual40, deepEquals, effectiveBooleanValue, getAnnotations, getUnicodeStringValue, isArray, isMap, makeNewContext, simplify, typeCheck

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.saxon.om.FunctionItem

getGenre

Methods inherited from interface net.sf.saxon.om.GroundedValue

asIterable, concatenate, containsNode, materialize

Methods inherited from interface net.sf.saxon.om.Item

getLength, getStringValue, head, isStreamed, itemAt, iterate, reduce, subsequence

Methods inherited from interface net.sf.saxon.om.Sequence

makeRepeatable

Constructor Detail

SubstringBefore

public SubstringBefore()

Method Detail

isSubstringMatchingFunction

public boolean isSubstringMatchingFunction()

Description copied from class: CollatingFunctionFixed

Ask whether this function needs a collation that can handle substring matching

Overrides:

isSubstringMatchingFunction in class CollatingFunctionFixed

Returns:

true in the case of functions such as contains() and starts-with() where substring matching is required. Returns false by default;

call

public StringValue 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, in the form of a Sequence

Throws:

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

getElaborator

public Elaborator getElaborator()

Make an elaborator for a system function call on this function

Overrides:

getElaborator in class SystemFunction

Returns:

a suitable elaborator; or null if no custom elaborator is available