Alessandro D'Armiento created NIFI-6500:
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Summary: Add padLeft() and padRight() functions to expression
language
Key: NIFI-6500
URL: https://issues.apache.org/jira/browse/NIFI-6500
Project: Apache NiFi
Issue Type: New Feature
Components: Core Framework
Affects Versions: 1.9.2
Reporter: Alessandro D'Armiento
h2. Current Situation
- [Expression Language string
manipulation|https://nifi.apache.org/docs/nifi-docs/html/expression-language-guide.html#strings]
doesn't have anything to perform string padding
- [Existing
solutions|https://community.hortonworks.com/questions/99856/nifi-padding-string.html]
to achieve left or right padding are unintuitive and could require to
instantiate additional processors
h1. Improvement Proposal
- Support two new expression language methods
-- padLeft() will add characters on the left of the string until a certain size
is reached
--- padLeft(int n) will add a default character at the left of the input string
until it reaches the length n
--- padLeft(int n, char c) will add the c characters at the left of the input
string until it reaches the length n
-- padRight()
--- padRight(int n) will add a default character at the right of the input
string until it reaches the length n
--- padRight(int n, char c) will add the c characters at the right of the input
string until it reaches the length n
-- Default character should be a renderable character such as underscore
-- If the input string is already longer than the padding length, no operation
should be performed
h3. Examples
input = "myString"
${input:padLeft(10, '#')} => "##myString"
${input:padRight(10, '#')} => "myString##"
${input:padLeft(10)} => "__myString"
${input:padRight(10)} => "myString__"
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