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Code sample: add Java version #1945

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Feb 5, 2023
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Code sample: add Java version #1945

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Chapter 17.18, code sample: add Java version
deining Jan 29, 2023
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Merge branch 'main' into code-java-example
remkop Feb 5, 2023
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22 changes: 20 additions & 2 deletions docs/index.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -9261,9 +9261,27 @@ To show that the subcommand is mandatory, use the `synopsisSubcommandLabel` attr

There are some scenarios where picocli can not parse an option with a default value which is the same as a subcommand name. To work around this, you can parse the option yourself using <<Custom Parameter Processing,`IParameterConsumer`>>. A simple implementation is shown below. See https://github.com/remkop/picocli/issues/1428[this issue] for more details.

.Java
[source,java,role="primary"]
----
class ExecParameterConsumer implements IParameterConsumer {
public void consumeParameters(Stack<String> args,
ArgSpec argSpec,
CommandSpec commandSpec) {
if (args.isEmpty()) {
throw new ParameterException(
commandSpec.commandLine(),
"Missing required parameter for option " +
((OptionSpec) argSpec).longestName()
);
}
argSpec.setValue(args.pop());
}
}
----

.Kotlin
[source,kotlin,role="primary"]
[source,kotlin,role="secondary"]
----
class MyParameterConsumer : CommandLine.IParameterConsumer {
override fun consumeParameters(
Expand All @@ -9278,7 +9296,7 @@ class MyParameterConsumer : CommandLine.IParameterConsumer {
(argSpec as CommandLine.Model.OptionSpec).longestName()
)
}
argSpec.setValue(args.pop());
argSpec.setValue(args.pop())
}
}
----
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