Package com.bakdata.kafka

Class EnvironmentArgumentsParser

java.lang.Object

com.bakdata.kafka.EnvironmentArgumentsParser

public class EnvironmentArgumentsParser
extends Object

This class is primarily used to inject environment variables to the passed in command line arguments in KafkaPropertiesFactory.

In general a usage would look like this:

 final String[] environmentArguments = new EnvironmentArgumentsParser(ENV_PREFIX).parseVariables(System.getenv());
 

The class collects all environment variables starting with environmentPrefix and replaces the environmentDelimiter with the commandLineDelimiter. Furthermore, it transforms all words to lowercase and prepends "--" to match the command line argument descriptors.

Example:

var ENV_PREFIX = "APP_"; Transformation: APP_INPUT_TOPIC --> --input-topic

Constructor Summary

Constructors

Constructor	Description
EnvironmentArgumentsParser(String environmentPrefix)	Create a new parser with a default command line delimiter of - and a default environment delimiter of _
EnvironmentArgumentsParser(String environmentPrefix, String commandLineDelimiter, String environmentDelimiter)	Create a new parser

Method Summary

Modifier and Type	Method	Description
List<String>	parseVariables(Map<String,String> environment)	Parse a list of environment variables as command line arguments.

Methods inherited from class java.lang.Object

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

Constructor Details

EnvironmentArgumentsParser

public EnvironmentArgumentsParser(String environmentPrefix)

Create a new parser with a default command line delimiter of - and a default environment delimiter of _

Parameters:

environmentPrefix - prefix to use to detect environment variables representing a command line argument

EnvironmentArgumentsParser

public EnvironmentArgumentsParser(String environmentPrefix,
 String commandLineDelimiter,
 String environmentDelimiter)

Create a new parser

Parameters:

environmentPrefix - prefix to use to detect environment variables representing a command line argument

commandLineDelimiter - delimiter to use to concatenate fragments of a command line argument

environmentDelimiter - delimiter to use to detect fragments of a command line argument in an environment variable

Method Details

parseVariables

public List<String> parseVariables(Map<String,String> environment)

Parse a list of environment variables as command line arguments. All variables starting with the configured prefix are converted by using the configured delimiters.

Parameters:

environment - map of environment variables

Returns:

parsed command line arguments