- java.lang.Object
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- picocli.CommandLine.Model.ArgSpec
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- picocli.CommandLine.Model.PositionalParamSpec
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- Enclosing class:
- CommandLine.Model
public static class CommandLine.Model.PositionalParamSpec extends CommandLine.Model.ArgSpec
ThePositionalParamSpec
class models aspects of a positional parameter of a command, including whether it is required or optional, and attributes for the usage help message describing the positional parameter.Positional parameters have an
index
(or a range of indices). A positional parameter is matched when the parser encounters a command line argument at that index. Named options and their parameters do not change the index counter, so the command line can contain a mixture of positional parameters and named options.Depending on the positional parameter's
arity
, the parser may consume multiple command line arguments starting from the current index. The parser will callsetValue
on thePositionalParamSpec
for each of the parameters encountered. For multi-value positional parameters, thetype
may be an array, aCollection
or aMap
. In this case the parser will get the data structure by callinggetValue
and modify the contents of this data structure. (In the case of arrays, the array is replaced with a new instance with additional elements.)Before calling the setter, picocli converts the positional parameter value from a String to the parameter's type.
- If a positional parameter-specific
converter
is configured, this will be used for type conversion. If the positional parameter's type is aMap
, the map may have different types for its keys and its values, soconverters
should provide two converters: one for the map keys and one for the map values. - Otherwise, the positional parameter's
type
is used to look up a converter in the list of registered converters. For multi-value positional parameters, thetype
may be an array, or aCollection
or aMap
. In that case the elements are converted based on the positional parameter'sauxiliaryTypes
. The auxiliaryType is used to look up the converter(s) to use to convert the individual parameter values. Maps may have different types for its keys and its values, soauxiliaryTypes
should provide two types: one for the map keys and one for the map values.
PositionalParamSpec
objects are used by the picocli command line interpreter and help message generator. Picocli can construct aPositionalParamSpec
automatically from fields and methods with@Parameters
annotations. Alternatively aPositionalParamSpec
can be constructed programmatically.When a
PositionalParamSpec
is created from a@Parameters
-annotated field or method, it is "bound" to that field or method: this field is set (or the method is invoked) when the position is matched andsetValue
is called. Programmatically constructedPositionalParamSpec
instances will remember the value passed to thesetValue
method so it can be retrieved with thegetValue
method. This behaviour can be customized by installing a customCommandLine.Model.IGetter
andCommandLine.Model.ISetter
on thePositionalParamSpec
.- Since:
- 3.0
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
CommandLine.Model.PositionalParamSpec.Builder
Builder responsible for creating validPositionalParamSpec
objects.
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Field Summary
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Fields inherited from class picocli.CommandLine.Model.ArgSpec
annotatedElement, toString, typeInfo, valueIsDefaultValue
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description static CommandLine.Model.PositionalParamSpec.Builder
builder()
static CommandLine.Model.PositionalParamSpec.Builder
builder(CommandLine.Model.IAnnotatedElement source, CommandLine.IFactory factory)
static CommandLine.Model.PositionalParamSpec.Builder
builder(CommandLine.Model.PositionalParamSpec original)
Returns a Builder initialized from the specifiedPositionalSpec
.boolean
equals(Object obj)
protected Collection<String>
getAdditionalDescriptionKeys()
Returns the additional lookup keys for finding description lines in the resource bundle for this positional parameter.int
hashCode()
CommandLine.Range
index()
Returns an index or range specifying which of the command line arguments should be assigned to this positional parameter.boolean
isOption()
Returnstrue
if this argument is a named option,false
otherwise.boolean
isPositional()
Returnstrue
if this argument is a positional parameter,false
otherwise.CommandLine.Model.PositionalParamSpec.Builder
toBuilder()
Returns a new Builder initialized with the attributes from thisPositionalParamSpec
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Methods inherited from class picocli.CommandLine.Model.ArgSpec
arity, auxiliaryTypes, command, completionCandidates, converters, defaultValue, defaultValueString, defaultValueString, description, descriptionKey, echo, equalsImpl, getter, getValue, group, hashCodeImpl, hasInitialValue, hidden, hideParamSyntax, inherited, initialValue, interactive, internalShowDefaultValue, isMultiValue, isValueGettable, mapFallbackValue, messages, messages, originallyRequired, originalStringValues, parameterConsumer, paramLabel, preprocessor, prompt, renderedDescription, required, resetOriginalStringValues, resetStringValues, root, scope, scopeType, setter, setValue, setValue, showDefaultValue, splitRegex, splitRegexSynopsisLabel, stringValues, toString, type, typedValues, typeInfo, userObject
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Method Detail
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builder
public static CommandLine.Model.PositionalParamSpec.Builder builder()
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builder
public static CommandLine.Model.PositionalParamSpec.Builder builder(CommandLine.Model.PositionalParamSpec original)
Returns a Builder initialized from the specifiedPositionalSpec
.- Since:
- 4.0
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builder
public static CommandLine.Model.PositionalParamSpec.Builder builder(CommandLine.Model.IAnnotatedElement source, CommandLine.IFactory factory)
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toBuilder
public CommandLine.Model.PositionalParamSpec.Builder toBuilder()
Returns a new Builder initialized with the attributes from thisPositionalParamSpec
. Callingbuild
immediately will return a copy of thisPositionalParamSpec
.- Returns:
- a builder that can create a copy of this spec
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isOption
public boolean isOption()
Description copied from class:CommandLine.Model.ArgSpec
Returnstrue
if this argument is a named option,false
otherwise.- Specified by:
isOption
in classCommandLine.Model.ArgSpec
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isPositional
public boolean isPositional()
Description copied from class:CommandLine.Model.ArgSpec
Returnstrue
if this argument is a positional parameter,false
otherwise.- Specified by:
isPositional
in classCommandLine.Model.ArgSpec
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getAdditionalDescriptionKeys
protected Collection<String> getAdditionalDescriptionKeys()
Returns the additional lookup keys for finding description lines in the resource bundle for this positional parameter.- Specified by:
getAdditionalDescriptionKeys
in classCommandLine.Model.ArgSpec
- Returns:
- a collection with the following single value:
paramLabel() + "[" + index() + "]"
. - Since:
- 4.0
- See Also:
CommandLine.Model.OptionSpec.getAdditionalDescriptionKeys()
,getAdditionalDescriptionKeys()
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index
public CommandLine.Range index()
Returns an index or range specifying which of the command line arguments should be assigned to this positional parameter.- See Also:
CommandLine.Parameters.index()
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