public static class MapFunctionSet.MapGet extends SystemFunction
Constructor and Description |
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MapGet() |
Modifier and Type | Method and Description |
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Sequence |
call(XPathContext context,
Sequence[] arguments)
Call the Callable.
|
int |
getCardinality(Expression[] args)
Get the cardinality, given knowledge of the actual arguments
|
ItemType |
getResultItemType(Expression[] args)
Get the return type, given knowledge of the actual arguments
|
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 |
supplyTypeInformation(ExpressionVisitor visitor,
ContextItemStaticInfo contextItemType,
Expression[] arguments)
Method called during static type checking.
|
dependsOnContextItem, dynamicCall, equals, export, exportAdditionalArguments, exportAttributes, fixArguments, getArity, getCompilerName, getContextNode, getDescription, getDetails, getErrorCodeForTypeErrors, getFunctionItemType, getFunctionName, getIntegerBounds, getNetCost, getOperandRoles, getRequiredType, getResultItemType, getRetainedStaticContext, getSpecialProperties, getStaticBaseUriString, getStreamerName, getUniStringArg, hashCode, importAttributes, isSequenceVariadic, isTrustedResultType, makeCall, makeFunction, makeFunctionCall, resultIfEmpty, setArity, setDetails, setRetainedStaticContext, toShortString, toString, typeCheckCaller
atomize, deepEquals, effectiveBooleanValue, getAnnotations, getUnicodeStringValue, isArray, isMap, makeNewContext, simplify, typeCheck
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
getLength, getStringValue, head, isStreamed, itemAt, iterate, reduce, subsequence
asIterable, concatenate, containsNode, materialize
makeRepeatable
public void supplyTypeInformation(ExpressionVisitor visitor, ContextItemStaticInfo contextItemType, Expression[] arguments) throws XPathException
supplyTypeInformation
in class SystemFunction
visitor
- an expression visitor, providing access to the static context and configurationcontextItemType
- information about whether the context item is set, and what its type isarguments
- the expressions appearing as arguments in the function callXPathException
- if an error is detectedpublic ItemType getResultItemType(Expression[] args)
getResultItemType
in class SystemFunction
args
- the actual arguments suppliedpublic int getCardinality(Expression[] args)
getCardinality
in class SystemFunction
args
- the actual arguments suppliedpublic Expression makeOptimizedFunctionCall(ExpressionVisitor visitor, ContextItemStaticInfo contextInfo, Expression... arguments) throws XPathException
makeOptimizedFunctionCall
in class SystemFunction
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.XPathException
- if an error is detectedpublic Sequence call(XPathContext context, Sequence[] arguments) throws XPathException
Callable
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
or AtomicValue
.
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.
XPathException
- if a dynamic error occurs during the evaluation of the expressionCopyright (c) 2004-2022 Saxonica Limited. All rights reserved.