Package com.singularsys.extensions.lambda

Class StandardListProcessor

java.lang.Object

com.singularsys.extensions.lambda.StandardListProcessor

All Implemented Interfaces:

ListProcessor, JepComponent, java.io.Serializable

Direct Known Subclasses:

FieldListProcessor

public class StandardListProcessor
extends java.lang.Object
implements ListProcessor

Default implementation of a ListProcessor. Works with the standard Jep List and Ele functions which use Vector<Object> for lists.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected Sort	sortFun

Constructor Summary

Constructors

Constructor	Description
StandardListProcessor()

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 ListProcessor.getList() to the type used by Jep environment.
JepComponent	getLightWeightInstance()	Gets a light-weight instance suitable for using in multiple threads.
java.util.List<java.lang.Object>	getList()	Get an empty list which elements can be added.
void	init(Jep jep)	Initialize the component.

Methods inherited from class java.lang.Object

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

Field Detail

sortFun

protected Sort sortFun

Constructor Detail

StandardListProcessor

public StandardListProcessor()

Method Detail

init

public void init(Jep jep)

Description copied from interface: JepComponent

Initialize the component. This methods is called whenever a component is added to Jep. Hence it allows components to keep track of the other components they may rely on.

Specified by:

init in interface JepComponent

Parameters:

jep - the current Jep instance

getLightWeightInstance

public JepComponent getLightWeightInstance()

Description copied from interface: JepComponent

Gets a light-weight instance suitable for using in multiple threads.

Specified by:

getLightWeightInstance in interface JepComponent

Returns:

either an new instance, null or 'this'.

fromArgs

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

Description copied from interface: ListProcessor

Returns an iterator view of the input arguments.

Specified by:

fromArgs in interface ListProcessor

Parameters:

arg - an input to the function

Returns:

an Iterable view of the argument

Throws:

EvaluationException - on error

getList

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

Description copied from interface: ListProcessor

Get an empty list which elements can be added.

Specified by:

getList in interface ListProcessor

Returns:

an empty list

fromList

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

Description copied from interface: ListProcessor

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

Specified by:

fromList in interface ListProcessor

Parameters:

list - a list

Returns:

a type suitable for use by Jep.

Throws:

EvaluationException - on error

fromCollection

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

Description copied from interface: ListProcessor

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

Specified by:

fromCollection in interface ListProcessor

Parameters:

tree - input collection

Returns:

a type suitable for use by Jep

Throws:

EvaluationException - on error

compareResult

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

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

Specified by:

compareResult in interface ListProcessor

Parameters:

val - input value from Jep environment, expected to be a type which can be converted to an Number.

Returns:

-1, 0 or 1

Throws:

EvaluationException - on error

See Also:

Comparator.compare(Object, Object)