Nifi Expression Language: anyDelineatedValue Question

[#1]

Hi All

I just have a quick expression language question. Does the anyDelineatedValue return the whole attribute if the delimiter is not present.

example:

number_list = 1000

${anyDelineatedValue("${number_list}, ","):startsWith("1")}

Would the above statement return True?

[#2 · Accepted solution]

@Richard Scott

Yes it returns True as attribute value.

${anyDelineatedValue("${number_list}, ","):startsWith("1")} //split the numbers_list string with ,(based on delimiter) and check any of the number_list values is starting with 1 (or) not.

As we are having just 1000 so number_list string then the expression language check for is the number_list any value is starting with 1 so the result is True.

Example:-

For ${anyDelineatedValue("${number_list}, ","):startsWith("1")}

Case1:-

number_list 1000,2000,3000 
result True //because our expression language is checking for any of the delineated values and we are having 1000 which is starting with 1 so returns as True.

Case2:-

number_list 2000,2000,3000 
result False //because any of the number list values are not starting with 1 so the result is False.

In Addition

You can evaluate the expression language by using Generate flowfile processor

Configs:-

1. Drag and drop generate flowfile processor
2. Right click and click on Configure
3. In properties tab click on + sign that is highlighted in above screenshot and add new property as

number_list

1000

4.Click on Scheduling Tab and keep Timerdriven with Run schedule as 11111111110 (or) some big number, so the processor trigger 1 flowfile after those many sec that we have given in Run Schedule value.

UpdateAttribute Configs:-

Follow same steps as above and add new property as

ad(your property name)

${anyDelineatedValue("${number_list}",","):startsWith("1")}

After update attribute processor we are going to add ad attribute to the flowfile as result of expression that we mentioned i.e

${anyDelineatedValue("${number_list}",","):startsWith("1")}

Output:-

In above screenshot we are having ad attribute having value as true.

Flow Screenshot:-

Like this way you can test expression language using NiFi.

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