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

Class NoneOperand

  • All Implemented Interfaces:
    Cloneable, Comparable<Operand<?>>, ArgsAccessor, Operand<Boolean>, Syntaxable, SyntaxUsage, org.refcodes.component.Resetable, org.refcodes.mixin.AliasAccessor, org.refcodes.mixin.Clonable, org.refcodes.mixin.DescriptionAccessor, org.refcodes.mixin.EnabledAccessor, org.refcodes.mixin.TypeAccessor<Boolean>, org.refcodes.mixin.ValueAccessor<Boolean>
    public class NoneOperand
extends AbstractOperand<Boolean>
implements Operand<Boolean>, org.refcodes.mixin.EnabledAccessor
    The NoneOperand represents an empty set of arguments, e.g. no command line argument is being passed. Usually only makes sense near the root of a Syntaxable tree (e.g. inside the main XorCondition) to test ALL arguments passed to an application and one invocation may have neither optional (as of AnyCondition) nor mandatory arguments allowed.

    • Method Detail

      • parseArgs

        public List<Operand<Boolean>> parseArgs​(String[] aArgs,
                                        String[] aOptions)
                                 throws UnknownArgsException,
                                        AmbiguousArgsException,
                                        ParseArgsException,
                                        SuperfluousArgsException
        Parses the provided command line arguments and determines the according values by evaluating this Syntaxable instance or, in case of being a node in the syntax tree (such as a ArgsSyntax, traversing the child Syntaxable instances' Syntaxable.parseArgs(String[], String[]) methods. In case of successfully parsing this Syntaxable and / or the child Syntaxable instances, the evaluated command line arguments are returned: Depending on the Syntaxable 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 Syntaxable instance being traversed. This method is commonly used by a root Syntaxable's ArgsParser.evalArgs(String[]) method, which delegates to the Syntaxable.parseArgs(String[], String[]) 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 Syntaxable.parseArgs(String[], String[]) method as ignoring superfluous command line arguments will cause unexpected behavior from the point of view of the invoker.
        Specified by:
        parseArgs in interface Syntaxable
        Overrides:
        parseArgs in class AbstractOperand<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.
        Returns:
        The list of evaluated command line arguments being instances of the Operand interfaces or its sub-types.
        Throws:
        UnknownArgsException - Thrown in case not one command line argument matched regarding the provided args vs. the expected args.
        AmbiguousArgsException - Thrown in case at least one command line argument is ambiguous regarding expected args vs. provided args.
        ParseArgsException - Thrown in case the provided command line arguments do not respect the required syntax or cannot be converted to the required type
        SuperfluousArgsException - in case there were arguments found not being used (superfluous arguments), thrown only in very specific cases (throw with care!).

      • toUsage

        public String toUsage​(SyntaxNotation aSyntaxNotation,
                      String aOptionEscCode,
                      String aResetEscCode)
        Returns the human readable (verbose) syntax of implementing class ATTENTION: As of different parenthesis settings for some notations regarding the root Syntaxable and the child Syntaxables, the method Syntaxable.toSyntax(SyntaxNotation, String, String) is called from inside a Syntaxable hierarchy. In case the syntax is to be retrieved from the root Syntaxable or an encapsulating and different type, then the applicable method to be called is SyntaxUsage.toUsage(SyntaxNotation), as for some notations it will for example not create the most outer braces.
        Specified by:
        toUsage in interface SyntaxUsage
        Parameters:
        aSyntaxNotation - The syntax notation used for generating the command line arguments syntax.
        aOptionEscCode - The escape code to be used when processing an option, e.g. this can be an ANSI Escape-Code to highlight the option parameters (for example "--help", "-q" and so on).
        aResetEscCode - The escape code to close (reset) any Escape-Code being set before.
        Returns:
        The human readable (verbose) command line arguments syntax.

      • isEnabled

        public boolean isEnabled()
        Determines whether none arguments have been passed.
        Specified by:
        isEnabled in interface org.refcodes.mixin.EnabledAccessor
        Returns:
        True in case none arguments have been passed.