Module org.refcodes.cli
Package org.refcodes.cli

Class Flag

java.lang.Object
org.refcodes.cli.AbstractOperand<T>
org.refcodes.cli.AbstractOption<Boolean>
org.refcodes.cli.Flag
All Implemented Interfaces:
Cloneable, Comparable<Operand<?>>, ArgsAccessor, Constituent, Operand<Boolean>, Option<Boolean>, Synopsisable, org.refcodes.mixin.AliasAccessor, org.refcodes.mixin.Clonable, org.refcodes.mixin.DescriptionAccessor, org.refcodes.mixin.EnabledAccessor, org.refcodes.mixin.Resetable, org.refcodes.mixin.Schemable<CliSchema>, org.refcodes.mixin.TypeAccessor<Boolean>, org.refcodes.mixin.ValueAccessor<Boolean>
Direct Known Subclasses:
CleanFlag, DaemonFlag, DebugFlag, ForceFlag, HelpFlag, InitFlag, QuietFlag, SysInfoFlag, VerboseFlag
public class Flag extends AbstractOption<Boolean> implements Option<Boolean>, org.refcodes.mixin.EnabledAccessor
The Flag class implements the Option interface for representing either a true or a false state: When a flag is provided to your command line arguments, then it is considered to be true, when it is omitted, then it is considered to be false as of isEnabled().

  • Field Details

    • _description

      protected String _description

  • Constructor Details

    • Flag

      public Flag(Character aShortOption, String aLongOption, String aAlias, String aDescription)
      Instantiates a new Flag with the given arguments.
      Parameters:
      aShortOption - The short option to use.
      aLongOption - The long option to use.
      aAlias - The alias to be used for naming purposes.
      aDescription - The description of the Flag

    • Flag

      public Flag(Character aShortOption, String aLongOption, String aDescription)
      Instantiates a new Flag with the given arguments. In case a long option is provided, the intance's alias will automatically be set with the long option, else the short option is used ass alias.
      Parameters:
      aShortOption - The short option to use.
      aLongOption - The long option to use.
      aDescription - The description of the Flag

    • Flag

      public Flag(String aLongOption, String aAlias, String aDescription)
      Instantiates a new Flag with the given arguments.
      Parameters:
      aLongOption - The long option to use.
      aAlias - The alias to be used for naming purposes.
      aDescription - The description of the Flag

    • Flag

      public Flag(String aLongOption, String aDescription)
      Instantiates a new Flag with the given arguments. In case a long option is provided, the intance's alias will automatically be set with the long option.
      Parameters:
      aLongOption - The long option to use.
      aDescription - The description of the Flag

    • Flag

      public Flag(org.refcodes.struct.Relation<String,Boolean> aProperty)
      Instantiates a new Flag with the alias being the proerty's key and the value being the property's value. Depending on the provided property's key, the key is either used for the short option or the long option.
      Parameters:
      aProperty - The key (=alias) and the value for the operand.

  • Method Details

    • isEnabled

      public boolean isEnabled()
      Returns true if the switch has been set (enabled).
      Specified by:
      isEnabled in interface org.refcodes.mixin.EnabledAccessor
      Returns:
      True in case the Flag has been provided (set), else false.

    • parseArgs

      public List<Operand<Boolean>> parseArgs(String[] aArgs, String[] aOptions, CliContext aCliCtx) throws ArgsSyntaxException
      Parses the provided command line arguments and determines the according values by evaluating this Constituent instance or, in case of being a node in the syntax tree (such as a Condition, traversing the child Constituent instances' Constituent.parseArgs(String[], String[], CliContext) methods. In case of successfully parsing this Constituent and / or the child Constituent instances, the evaluated command line arguments are returned: Depending on the Constituent subclasses representing the evaluated command line arguments, instances of Flag classes, Option classes or Operand classes may be found in the result. In case of parsing failure, an according exception is thrown. ATTENTION: This method does not test for superfluous command line arguments being passed; e.g. command line arguments not being evaluated by any of the Constituent instance being traversed. This method is commonly used by a root Constituent's ArgsParser.evalArgs(String[]) method, which delegates to the Constituent.parseArgs(String[], String[], CliContext) method and after which it determines whether there are superfluous arguments to be taken care of (by throwing an according exception). Business logic therefore should invoke the root node's Constituent.parseArgs(String[], String[], CliContext) method as ignoring superfluous command line arguments will cause unexpected behavior from the point of view of the invoker.
      Specified by:
      parseArgs in interface Constituent
      Overrides:
      parseArgs in class AbstractOption<Boolean>
      Parameters:
      aArgs - The command line arguments to be parsed.
      aOptions - The list of options (short and as well as long) which are reserved and cannot be used as value.
      aCliCtx - the cli context
      Returns:
      The list of evaluated command line arguments being instances of the Operand interfaces or its sub-types.
      Throws:
      ArgsSyntaxException - thrown in case of a command line arguments mismatch regarding provided and expected args.

    • toSyntax

      public String toSyntax(CliContext aCliCtx)
      This method is to be called from inside the Constituent hierarchy; use the method Synopsisable.toSynopsis(SyntaxNotation) in case you invoke syntax retrieval from the root Constituent. Returns the human readable (verbose) syntax of this Constituent instance including, in case of being a node in the syntax tree (such as a Condition, the syntax of the child Constituent instances. ATTENTION: As of different parenthesis settings for some notations regarding the root Constituent and the child Constituents, the method Constituent.toSyntax(CliContext) is called from inside the Constituent hierarchy. In case the syntax is to be retrieved from the root Constituent, then the applicable method to be called is Synopsisable.toSynopsis(SyntaxNotation), as for some notations it will for example not create the most outer braces.
      Specified by:
      toSyntax in interface Constituent
      Overrides:
      toSyntax in class AbstractOption<Boolean>
      Parameters:
      aCliCtx - The CliContext for which the syntax is being generated.
      Returns:
      The human readable (verbose) command line arguments syntax.

    • reset

      public void reset()
      Specified by:
      reset in interface org.refcodes.mixin.Resetable
      Overrides:
      reset in class AbstractOperand<Boolean>

    • toType

      protected Boolean toType(String aArg) throws ParseArgsException
      Double dispatch hook to be implemented by subclasses of the AbstractOperand for converting a command line argument to the required Operand's type. In case conversion failed, then an according exception is to be thrown.
      Specified by:
      toType in class AbstractOperand<Boolean>
      Parameters:
      aArg - The command line argument to be converted to an instance of the given type T.
      Returns:
      An instance of type T from the provided command line argument.
      Throws:
      ParseArgsException - Thrown in case the provided command line arguments do not respect the required syntax or cannot be converted to the required type.

    • getDescription

      public String getDescription()
      Specified by:
      getDescription in interface org.refcodes.mixin.DescriptionAccessor