net.sf.saxon.functions

Class StringJoin

java.lang.Object

net.sf.saxon.om.AbstractItem

net.sf.saxon.functions.AbstractFunction

net.sf.saxon.functions.SystemFunction

net.sf.saxon.functions.FoldingFunction

net.sf.saxon.functions.StringJoin

All Implemented Interfaces:

Callable, Function, GroundedValue, Item, Sequence

public class StringJoin
extends FoldingFunction

fn:string-join(string* $sequence, string $separator)

Constructor Summary

Constructors

Constructor and Description
StringJoin()

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o) Determine whether two expressions are equivalent
int	getCardinality(Expression[] arguments) Determine the cardinality of the function.
java.lang.String	getCompilerName() Get the (local) name of a class that can be used to generate bytecode for this system function
Fold	getFold(XPathContext context, Sequence... additionalArguments) Create the Fold object which actually performs the evaluation.
boolean	isReturnEmptyIfEmpty()
Expression	makeOptimizedFunctionCall(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo, Expression... arguments) Allow the function to create an optimized call based on the values of the actual arguments
void	setReturnEmptyIfEmpty(boolean option) Indicate that when the input sequence (first argument) is empty, the function should return an empty sequence rather than an empty string

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

call, getStreamerName

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

dependsOnContextItem, dynamicCall, export, exportAdditionalArguments, exportAttributes, fixArguments, getArity, getContextNode, getDescription, getDetails, getErrorCodeForTypeErrors, getFunctionItemType, getFunctionName, getIntegerBounds, getNetCost, getOperandRoles, getRequiredType, getResultItemType, getResultItemType, getRetainedStaticContext, getSpecialProperties, getStaticBaseUriString, importAttributes, isTrustedResultType, makeCall, makeFunction, makeFunctionCall, resultIfEmpty, setArity, setDetails, setRetainedStaticContext, supplyTypeInformation, typeCheckCaller

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

atomize, deepEquals, effectiveBooleanValue, getAnnotations, getStringValue, getStringValueCS, isArray, isMap, makeNewContext, simplify, typeCheck

Methods inherited from class net.sf.saxon.om.AbstractItem

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

Methods inherited from class java.lang.Object

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

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

iterate

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

head

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

getLength, head, itemAt, reduce, subsequence

Constructor Detail

StringJoin

public StringJoin()

Method Detail

setReturnEmptyIfEmpty

public void setReturnEmptyIfEmpty(boolean option)

Indicate that when the input sequence (first argument) is empty, the function should return an empty sequence rather than an empty string

Parameters:

option - true if an empty sequence should be returned when the input is an empty sequence.

isReturnEmptyIfEmpty

public boolean isReturnEmptyIfEmpty()

getCardinality

public int getCardinality(Expression[] arguments)

Determine the cardinality of the function.

Overrides:

getCardinality in class SystemFunction

Parameters:

arguments - the actual arguments supplied

Returns:

the most precise available cardinality that the function will return

equals

public boolean equals(java.lang.Object o)

Determine whether two expressions are equivalent

Overrides:

equals in class SystemFunction

makeOptimizedFunctionCall

public Expression makeOptimizedFunctionCall(ExpressionVisitor visitor,
                                            ContextItemStaticInfo contextInfo,
                                            Expression... arguments)
                                     throws XPathException

Allow the function to create an optimized call based on the values of the actual arguments

Overrides:

makeOptimizedFunctionCall in class SystemFunction

Parameters:

visitor - the expression visitor

contextInfo - information about the context item

arguments - the supplied arguments to the function call

Returns:

either a function call on this function, or an expression that delivers the same result, or null indicating that no optimization has taken place

Throws:

XPathException - if an error is detected

getFold

public Fold getFold(XPathContext context,
                    Sequence... additionalArguments)
             throws XPathException

Description copied from class: FoldingFunction

Create the Fold object which actually performs the evaluation. Must be implemented in every subclass.

Specified by:

getFold in class FoldingFunction

Parameters:

context - the dynamic evaluation context

additionalArguments - the values of all arguments other than the first.

Returns:

the Fold object used to compute the function

Throws:

XPathException - if a dynamic error occurs

getCompilerName

public java.lang.String getCompilerName()

Description copied from class: SystemFunction

Get the (local) name of a class that can be used to generate bytecode for this system function

Overrides:

getCompilerName in class SystemFunction

Returns:

the name of a bytecode generation class, or null if there is no bytecode support for this function