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I am using LineJoiner to merger street segments together based on the attribute STREET.Each segment contains STREET,FROM_STREET and TO_STREET and a SEQUENCE.I have ordered them by Sequence before the LineJoiner transformer and now I want to extract the FROM_STREET and TO_STREET for the merged segments.I renamed ROAD{0}.FROM_STREET to FROM_STREET,and that works fine.But how do I tell the List Element Selection to be the last element?It won't take -1 or any non-number or _element_count.Is there another way to do this?Ideally I would like it to be something simple like ROAD{MAX}.TO_STREET.
I'd probably use a ListIndexer here - it pushes all the list items at index 0 or -1 into attributes,with an optional prefix.
Agreed.I'd stick with the above method to get the first one.But BEFORE renaming the 0th element,I'd do the ListIndexer with -1 (which is the last element).If you log or inspect you'll see why -- doing the ListIndexer first will get you the TO_STREET and the FROM_STREET but from the last element of the list.Following that with the Renamer to get you the FROM_STREET of the 0th will overwrite the other value that was there and get you what you want.
Alternatively,FME Functionsmight also be used in an expression setting to the Value column of AttributeCreator,like this.
@Value(ROAD{@Evaluate(@NumElements(ROAD{})-1)}.TO_STREET)
The FMEFunctionCaller can also be used to perform the expression.
You can use the ListElementCounter to retrieve the index number of the last entry in a list.
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