com.pervasive.datarush.functions

Class ObjectInputTyper

java.lang.Object

com.pervasive.datarush.functions.ObjectInputTyper

All Implemented Interfaces:

FunctionTyper

public class ObjectInputTyper
extends Object
implements FunctionTyper

A typer determining the output type of a function based on the types of one or more Object inputs. If more than one input is used, the widest of the inputs is used.

Field Summary

Fields

Modifier and Type	Field and Description
static HashMap<Class<?>,ScalarTokenType>	typeTokenMap

Constructor Summary

Constructors

Constructor and Description
ObjectInputTyper(int... indices)
ObjectInputTyper(ScalarTokenType bound, int... indices)

Method Summary

Modifier and Type	Method and Description
ScalarTokenType	computeResultType(FunctionContext ctx) Calculates the result type for the function given the provided context.
ScalarTokenType	computeUpperBound(FunctionContext ctx) Calculates the upper bound for the function given the provided context.

Methods inherited from class java.lang.Object

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

Field Detail

typeTokenMap

public static HashMap<Class<?>,ScalarTokenType> typeTokenMap

Constructor Detail

ObjectInputTyper

public ObjectInputTyper(int... indices)

ObjectInputTyper

public ObjectInputTyper(ScalarTokenType bound,
                        int... indices)

Method Detail

computeUpperBound

public ScalarTokenType computeUpperBound(FunctionContext ctx)

Description copied from interface: FunctionTyper

Calculates the upper bound for the function given the provided context.

The context contains the upper bounds on the types of all arguments to the function. If a argument is not a subclass of ScalarValuedFunction, its type is null.

Specified by:

computeUpperBound in interface FunctionTyper

Parameters:

ctx - the context of the function being processed

Returns:

the upper bound on the function

computeResultType

public ScalarTokenType computeResultType(FunctionContext ctx)

Description copied from interface: FunctionTyper

Calculates the result type for the function given the provided context.

The context contains the actual result types of all arguments to the function. If a argument is not a subclass of ScalarValuedFunction, its type is null.

Specified by:

computeResultType in interface FunctionTyper

Parameters:

ctx - the context of the function being processed

Returns:

the result type of the function