RecursiveLoop - 6.3

Talend Data Mapper User Guide

EnrichVersion
6.3
EnrichProdName
Talend Big Data Platform
Talend Data Fabric
Talend Data Management Platform
Talend Data Services Platform
Talend MDM Platform
Talend Real-Time Big Data Platform
task
Design and Development
EnrichPlatform
Talend Studio

Name

RecursiveLoop

Purpose

Loop recursively according to some input map element.

Description

This loop function can be used only in the loop expression tab and specifies that the output map element associated with the loop expression tab is to loop recursively corresponding to the value of the input map element argument expression.

This is used in the case where both the enclosing output map element and the referenced input map element are recursive map elements. For each instance of the element in the input, regardless of the depth of recursion, an instance of the output is created.

If no sort keys are specified, the order of the output is the same order as the input elements.

Property

Input map element ([Map] Element)

An input map element that loops.

Property

Filters (Boolean)

Specify an expression that returns a boolean. This expression is evaluated for each instance of the loop. If this filter expression returns true, the instance is included in the loop. If it returns false, the instance is excluded from the loop.

Property

Sort Keys (Variable) (Either AscendingSortKey or DescendingSortKey functions)

Any number of AscendingSort or DescendingSort functions that specify each sort key.

Property

Contexts (Either NestedContext or EnclosingContext functions)

Specify either the EnclosingContext and/or NestedContext function. EnclosingContext specifies the output map element that encloses this loop. If not specified, the nearest looping ancestor map element is used.

NestedContext allows another loop expression to be specified within this loop expression.