For the latest stable version, please use Spring Shell 3.3.1!

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();