Package com.singularsys.extensions.lambda

Interface ListProcessor

All Superinterfaces:

JepComponent, java.io.Serializable

All Known Implementing Classes:

FieldListProcessor, MatrixListProcessor, StandardListProcessor

public interface ListProcessor
extends JepComponent

Defines some utility methods use by higher order functions for processing lists of data, where the actual types used by Jep may differ.

Method Summary

Modifier and Type	Method	Description
int	compareResult(java.lang.Object val)	Converts results from Jep evaluation to an integer -1, 0 or 1 used in comparison.
java.lang.Iterable<java.lang.Object>	fromArgs(java.lang.Object arg)	Returns an iterator view of the input arguments.
java.lang.Object	fromCollection(java.util.Collection<java.lang.Object> tree)	Convert a general collection into a type used the the Jep environment.
java.lang.Object	fromList(java.util.List<java.lang.Object> list)	Convert a list produced by getList() to the type used by Jep environment.
java.util.List<java.lang.Object>	getList()	Get an empty list which elements can be added.

Methods inherited from interface com.singularsys.jep.JepComponent

getLightWeightInstance, init

Method Detail

fromArgs

java.lang.Iterable<java.lang.Object> fromArgs(java.lang.Object arg)
                                       throws EvaluationException

Returns an iterator view of the input arguments.

Parameters:

arg - an input to the function

Returns:

an Iterable view of the argument

Throws:

EvaluationException - on error

getList

java.util.List<java.lang.Object> getList()

Get an empty list which elements can be added.

Returns:

an empty list

fromList

java.lang.Object fromList(java.util.List<java.lang.Object> list)
                   throws EvaluationException

Convert a list produced by getList() to the type used by Jep environment. Some implementations just return the input.

Parameters:

list - a list

Returns:

a type suitable for use by Jep.

Throws:

EvaluationException - on error

fromCollection

java.lang.Object fromCollection(java.util.Collection<java.lang.Object> tree)
                         throws EvaluationException

Convert a general collection into a type used the the Jep environment.

Parameters:

tree - input collection

Returns:

a type suitable for use by Jep

Throws:

EvaluationException - on error

compareResult

int compareResult(java.lang.Object val)
           throws EvaluationException

Converts results from Jep evaluation to an integer -1, 0 or 1 used in comparison.

Parameters:

val - input value from Jep environment

Returns:

-1, 0 or 1

Throws:

EvaluationException - on error

See Also:

Comparator.compare(Object, Object)