This version is still in development and is not considered stable yet. For the latest stable version, please use Spring Shell 3.4.0!

Types

This section talks about how particular data type is used as an option value.

String

String is a most simplest type as there’s no conversion involved as what’s coming in from a user is always a string.

String example(@ShellOption(value = "arg1") String arg1) {
	return "Hello " + arg1;
}

While it’s not strictly required to define type as a String it’s always adviced to do so.

CommandRegistration.builder()
	.command("example")
	.withOption()
		.longNames("arg1")
		.type(String.class)
		.required()
		.and()
	.withTarget()
		.function(ctx -> {
			String arg1 = ctx.getOptionValue("arg1");
			return "Hello " + arg1;
		})
		.and()
	.build();

Boolean

Using boolean types is a bit more involved as there are boolean and Boolean where latter can be null. Boolean types are usually used as flags meaning argument value may not be needed.

String example(
	@ShellOption() boolean arg1,
	@ShellOption(defaultValue = "true") boolean arg2,
	@ShellOption(defaultValue = "false") boolean arg3,
	@ShellOption() Boolean arg4,
	@ShellOption(defaultValue = "true") Boolean arg5,
	@ShellOption(defaultValue = "false") Boolean arg6
) {
	return String.format("arg1=%s arg2=%s arg3=%s arg4=%s arg5=%s arg6=%s",
			arg1, arg2, arg3, arg4, arg5, arg6);
}

shell:>example
arg1=false arg2=true arg3=false arg4=false arg5=true arg6=false

shell:>example --arg4
arg1=false arg2=true arg3=false arg4=true arg5=true arg6=false

shell:>example --arg4 false
arg1=false arg2=true arg3=false arg4=false arg5=true arg6=false

CommandRegistration.builder()
	.command("example")
	.withOption()
		.longNames("arg1").type(boolean.class).and()
	.withOption()
		.longNames("arg2").type(boolean.class).defaultValue("true").and()
	.withOption()
		.longNames("arg3").type(boolean.class).defaultValue("false").and()
	.withOption()
		.longNames("arg4").type(Boolean.class).and()
	.withOption()
		.longNames("arg5").type(Boolean.class).defaultValue("true").and()
	.withOption()
		.longNames("arg6").type(Boolean.class).defaultValue("false").and()
	.withTarget()
		.function(ctx -> {
			boolean arg1 = ctx.hasMappedOption("arg1")
					? ctx.getOptionValue("arg1")
					: false;
			boolean arg2 = ctx.getOptionValue("arg2");
			boolean arg3 = ctx.getOptionValue("arg3");
			Boolean arg4 = ctx.getOptionValue("arg4");
			Boolean arg5 = ctx.getOptionValue("arg5");
			Boolean arg6 = ctx.getOptionValue("arg6");
			return String.format("Hello arg1=%s arg2=%s arg3=%s arg4=%s arg5=%s arg6=%s",
					arg1, arg2, arg3, arg4, arg5, arg6);
		})
		.and()
	.build();

shell:>example
arg1=false arg2=true arg3=false arg4=null arg5=true arg6=false

shell:>example --arg4
arg1=false arg2=true arg3=false arg4=true arg5=true arg6=false

shell:>example --arg4 false
arg1=false arg2=true arg3=false arg4=false arg5=true arg6=false

Number

Numbers are converted as is.

String example(@ShellOption(value = "arg1") int arg1) {
	return "Hello " + arg1;
}

CommandRegistration.builder()
	.command("example")
	.withOption()
		.longNames("arg1")
		.type(int.class)
		.required()
		.and()
	.withTarget()
		.function(ctx -> {
			boolean arg1 = ctx.getOptionValue("arg1");
			return "Hello " + arg1;
		})
		.and()
	.build();

Enum

Conversion to enums is possible if given value is exactly matching enum itself. Currently you can convert assuming case insensitivity.

enum OptionTypeEnum {
	ONE,TWO,THREE
}

String example(@ShellOption(value = "arg1") OptionTypeEnum arg1) {
	return "Hello " + arg1;
}

CommandRegistration.builder()
	.command("example")
	.withOption()
		.longNames("arg1")
		.type(OptionTypeEnum.class)
		.required()
		.and()
	.withTarget()
		.function(ctx -> {
			OptionTypeEnum arg1 = ctx.getOptionValue("arg1");
			return "Hello " + arg1;
		})
		.and()
	.build();

Array

Arrays can be used as is with strings and primitive types.

String example(@ShellOption(value = "arg1") String[] arg1) {
	return "Hello " + arg1;
}

CommandRegistration.builder()
	.command("example")
	.withOption()
		.longNames("arg1")
		.type(String[].class)
		.required()
		.and()
	.withTarget()
		.function(ctx -> {
			String[] arg1 = ctx.getOptionValue("arg1");
			return "Hello " + arg1;
		})
		.and()
	.build();