Class Concat31
- All Implemented Interfaces:
Callable
,PushableFunction
,FunctionItem
,GroundedValue
,Item
,Sequence
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptioncall
(XPathContext context, Sequence[] arguments) Call the Callable.Get the item type of the function itemgetRequiredType
(int arg) Get the required type of the nth argumentmakeOptimizedFunctionCall
(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo, Expression... arguments) Allow the function to create an optimized call based on the values of the actual argumentsvoid
process
(Outputter destination, XPathContext context, Sequence[] arguments) Evaluate the function in "push" modeprotected Sequence
resultIfEmpty
(int arg) Ask if the function always returns a known result when one of the arguments is an empty sequenceMethods inherited from class net.sf.saxon.functions.SystemFunction
dependsOnContextItem, dynamicCall, equals, export, exportAdditionalArguments, exportAttributes, fixArguments, getArity, getCardinality, getContextNode, getDescription, getDetails, getElaborator, getErrorCodeForTypeErrors, getFunctionName, getIntegerBounds, getNetCost, getOperandRoles, getResultItemType, getResultItemType, getRetainedStaticContext, getSpecialProperties, getStaticBaseUriString, getStreamerName, getUniStringArg, hashCode, importAttributes, isSequenceVariadic, isTrustedResultType, makeCall, makeFunction, makeFunction40, makeFunctionCall, setArity, setDetails, setRetainedStaticContext, 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
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Constructor Details
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Concat31
public Concat31()
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Method Details
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resultIfEmpty
Description copied from class:SystemFunction
Ask if the function always returns a known result when one of the arguments is an empty sequence- Overrides:
resultIfEmpty
in classSystemFunction
- Parameters:
arg
- the argument whose value is an empty sequence (counting from zero)- Returns:
- the value to be returned when this argument is an empty sequence, or null if unknown / not applicable
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getFunctionItemType
Get the item type of the function item- Specified by:
getFunctionItemType
in interfaceFunctionItem
- Overrides:
getFunctionItemType
in classSystemFunction
- Returns:
- the function item's type
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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 classSystemFunction
- Parameters:
visitor
- the expression visitorcontextInfo
- information about the context itemarguments
- the supplied arguments to the function call. Note: modifying the contents of this array should not be attempted, it is likely to have no effect.- 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
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call
Description copied from interface:Callable
Call the Callable.- Specified by:
call
in interfaceCallable
- Parameters:
context
- the dynamic evaluation contextarguments
- the values of the arguments, supplied as Sequences.Generally it is advisable, if calling iterate() to process a supplied sequence, to call it only once; if the value is required more than once, it should first be converted to a
GroundedValue
by calling the utility method SequenceTool.toGroundedValue().If the expected value is a single item, the item should be obtained by calling Sequence.head(): it cannot be assumed that the item will be passed as an instance of
Item
orAtomicValue
.It is the caller's responsibility to perform any type conversions required to convert arguments to the type expected by the callee. An exception is where this Callable is explicitly an argument-converting wrapper around the original Callable.
- Returns:
- the result of the evaluation, in the form of a Sequence. It is the responsibility of the callee to ensure that the type of result conforms to the expected result type.
- Throws:
XPathException
- if a dynamic error occurs during the evaluation of the expression
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process
public void process(Outputter destination, XPathContext context, Sequence[] arguments) throws XPathException Description copied from interface:PushableFunction
Evaluate the function in "push" mode- Specified by:
process
in interfacePushableFunction
- Parameters:
destination
- the destination for the function resultcontext
- the dynamic evaluation contextarguments
- the supplied arguments to the function- Throws:
XPathException
- if a dynamic error occurs during the evaluation
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getRequiredType
Get the required type of the nth argument- Overrides:
getRequiredType
in classSystemFunction
- Parameters:
arg
- the number of the argument whose type is requested, zero-based- Returns:
- the required type of the argument as defined in the function signature
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