@Internal public final class ItemAtIndexArgumentTypeStrategy extends Object implements ArgumentTypeStrategy
ArgumentTypeStrategy
that expects:
a LogicalTypeFamily.NUMERIC
if the first argument is an LogicalTypeRoot.ARRAY
or LogicalTypeRoot.MULTISET
the type to be equal to the key type of LogicalTypeRoot.MAP
if the first argument is a
map.
Constructor and Description |
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ItemAtIndexArgumentTypeStrategy() |
Modifier and Type | Method and Description |
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Signature.Argument |
getExpectedArgument(FunctionDefinition functionDefinition,
int argumentPos)
Returns a summary of the function's expected argument at
argumentPos . |
Optional<DataType> |
inferArgumentType(CallContext callContext,
int argumentPos,
boolean throwOnFailure)
Main logic for inferring and validating an argument.
|
public Optional<DataType> inferArgumentType(CallContext callContext, int argumentPos, boolean throwOnFailure)
ArgumentTypeStrategy
CallContext.getArgumentDataTypes()
at argumentPos
, a casting operation can be inserted. An empty result means that the
given input type could not be inferred.inferArgumentType
in interface ArgumentTypeStrategy
callContext
- provides details about the function callargumentPos
- argument index in the CallContext
throwOnFailure
- whether this function is allowed to throw an ValidationException
with a meaningful exception in case the inference is not successful
or if this function should simply return an empty result.CallContext.newValidationError(String, Object...)
public Signature.Argument getExpectedArgument(FunctionDefinition functionDefinition, int argumentPos)
ArgumentTypeStrategy
argumentPos
.getExpectedArgument
in interface ArgumentTypeStrategy
functionDefinition
- the function definition that defines the function currently being
called.argumentPos
- the position within the function call for which the signature should be
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