public class ConstantFunction extends SystemFunction
Modifier and Type | Class and Description |
---|---|
static class |
ConstantFunction.False |
static class |
ConstantFunction.True |
Modifier and Type | Field and Description |
---|---|
GroundedValue |
value |
Constructor and Description |
---|
ConstantFunction(GroundedValue value) |
Modifier and Type | Method and Description |
---|---|
Sequence |
call(XPathContext context,
Sequence[] arguments)
Call the Callable.
|
IntegerValue[] |
getIntegerBounds()
For a function 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.
|
Expression |
makeFunctionCall(Expression[] arguments)
Make an expression that either calls this function, or that is equivalent to a call
on this function
|
dependsOnContextItem, dynamicCall, equals, export, exportAdditionalArguments, exportAttributes, fixArguments, getArity, getCardinality, getCompilerName, getContextNode, getDescription, getDetails, getErrorCodeForTypeErrors, getFunctionItemType, getFunctionName, getNetCost, getOperandRoles, getRequiredType, getResultItemType, getResultItemType, getRetainedStaticContext, getSpecialProperties, getStaticBaseUriString, getStreamerName, getUniStringArg, hashCode, importAttributes, isSequenceVariadic, isTrustedResultType, makeCall, makeFunction, makeOptimizedFunctionCall, resultIfEmpty, setArity, setDetails, setRetainedStaticContext, supplyTypeInformation, 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 GroundedValue value
public ConstantFunction(GroundedValue value)
public 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 expressionpublic Expression makeFunctionCall(Expression[] arguments)
SystemFunction
makeFunctionCall
in class SystemFunction
arguments
- the supplied arguments to the function callpublic IntegerValue[] getIntegerBounds()
SystemFunction
getIntegerBounds
in class SystemFunction
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