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

Class AbstractOperand<T>

java.lang.Object
org.refcodes.cli.AbstractOperand<T>
Type Parameters:
T - The generic type of the AbstractOperand's value.
All Implemented Interfaces:
Cloneable, Comparable<Operand<?>>, ArgsAccessor, MatchCountAccessor, Operand<T>, Synopsisable, Term, org.refcodes.exception.ExceptionAccessor<ArgsSyntaxException>, org.refcodes.mixin.AliasAccessor, org.refcodes.mixin.Clonable, org.refcodes.mixin.DescriptionAccessor, org.refcodes.mixin.Resetable, org.refcodes.mixin.Schemable, org.refcodes.mixin.TypeAccessor<T>, org.refcodes.mixin.ValueAccessor<T>
Direct Known Subclasses:
AbstractOption, NoneOperand, Operation, StringOperand
public abstract class AbstractOperand<T> extends Object implements Operand<T>
The AbstractOperand is an abstract implementation of an Operand providing the boiler plate when implementing the Operand interface.

  • Field Details

    • _matchCount

      protected int _matchCount

    • _description

      protected String _description

    • _exception

      protected ArgsSyntaxException _exception

  • Constructor Details

    • AbstractOperand

      public AbstractOperand(Class<T> aType, String aAlias, String aDescription)
      Constructs an Operand with the given arguments.
      Parameters:
      aType - The type of the value returned by the getValue() method.
      aAlias - The Operand's name, used for syntax creation.
      aDescription - The description to be used (without any line breaks).

    • AbstractOperand

      public AbstractOperand(Class<T> aType, String aAlias, String aDescription, Consumer<? extends Operand<T>> aConsumer)
      Constructs an Operand with the given arguments.
      Parameters:
      aType - The type of the value returned by the getValue() method.
      aAlias - The Operand's name, used for syntax creation.
      aDescription - The description to be used (without any line breaks).
      aConsumer - The Consumer being invoked in case this Operand participated in successfully parsing the command line arguments.

    • AbstractOperand

      public AbstractOperand(org.refcodes.struct.Relation<String,T> aProperty, Class<T> aType)
      Constructs an Operand with the given arguments.
      Parameters:
      aProperty - The key (= alias) and the value for the operand.
      aType - The type of the value returned by the getValue() method.

    • AbstractOperand

      public AbstractOperand(org.refcodes.struct.Relation<String,T> aProperty, Class<T> aType, Consumer<? extends Operand<T>> aConsumer)
      Constructs an Operand with the given arguments.
      Parameters:
      aProperty - The key (= alias) and the value for the operand.
      aType - The type of the value returned by the getValue() method.
      aConsumer - The Consumer being invoked in case this Option participated in successfully parsing the command line arguments.

  • Method Details

    • clone

      public Object clone() throws CloneNotSupportedException
      Specified by:
      clone in interface org.refcodes.mixin.Clonable
      Overrides:
      clone in class Object
      Throws:
      CloneNotSupportedException

    • compareTo

      public int compareTo(Operand<?> obj)
      Specified by:
      compareTo in interface Comparable<T>

    • getAlias

      public String getAlias()
      Retrieves the name (alias) of the parameter value which can be the name of the operand (Operand) or the option argument (Option), depending on the sub-type inheriting from this interface. The parameter name is merely used for constructing the command line arguments syntax String via Term.toSyntax(CliContext) and the command line arguments detail description when creating a command line tool's help output. Attention: The alias can also be used as a key when putting an Operand's key/value-pair into a dictionary such as is done by the ApplicationProperties type provided by the refcodes-properties-ext-runime artifact!
      Specified by:
      getAlias in interface org.refcodes.mixin.AliasAccessor
      Specified by:
      getAlias in interface Operand<T>
      Returns:
      The name of the parameter, e.g the name of the operand or the name of the option argument.

    • getType

      public Class<T> getType()
      Specified by:
      getType in interface org.refcodes.mixin.TypeAccessor<T>

    • getValue

      public T getValue()
      Specified by:
      getValue in interface Operand<T>
      Specified by:
      getValue in interface org.refcodes.mixin.ValueAccessor<T>

    • parseArgs

      public Operand<?>[] parseArgs(String[] aArgs, String[] aOptions, CliContext aCliContext) throws ArgsSyntaxException
      Parses the provided command line arguments and determines the according values by evaluating this Term instance or, in case of being a node in the syntax tree (such as a Condition, traversing the child Term instances' Term.parseArgs(String[], String[], CliContext) methods. In case of successfully parsing this Term and / or the child Term instances, the evaluated command line arguments are returned: Depending on the Term 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 Term instance being traversed. This method is commonly used by a root Term's ParseArgs.evalArgs(String[]) method, which delegates to the Term.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 Term.parseArgs(String[], String[], CliContext) method as ignoring superfluous command line arguments will aCause unexpected behavior from the point of view of the invoker.
      Specified by:
      parseArgs in interface Term
      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.
      aCliContext - 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.

    • getMatchCount

      public int getMatchCount()
      Determines the number of args being matched by the Term.parseArgs(String[], CliContext) (and similar) method(s) of the according syntax. This way we can determine which part of the syntax (tree) had most matches.
      Specified by:
      getMatchCount in interface MatchCountAccessor
      Specified by:
      getMatchCount in interface Term
      Returns:
      The number of args matching the according syntax (tree).

    • reset

      public void reset()
      Specified by:
      reset in interface org.refcodes.mixin.Resetable

    • getArgs

      public String[] getArgs()
      Retrieves the (command line) args which represent this Operand after being "parsed" (provided with command line args).
      Specified by:
      getArgs in interface ArgsAccessor
      Specified by:
      getArgs in interface Operand<T>
      Returns:
      The according args from the command line args.

    • toSchema

      public CliSchema toSchema()
      Specified by:
      toSchema in interface org.refcodes.mixin.Schemable
      Specified by:
      toSchema in interface Term

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • toSyntax

      public String toSyntax(CliContext aCliCtx)
      This method is to be called from inside the Term hierarchy; use the method Synopsisable.toSynopsis(SyntaxNotation) in case you invoke syntax retrieval from the root Term. Returns the human readable (verbose) syntax of this Term instance including, in case of being a node in the syntax tree (such as a Condition, the syntax of the child Term instances. ATTENTION: As of different parenthesis settings for some notations regarding the root Term and the child Terms, the method Term.toSyntax(CliContext) is called from inside the Term hierarchy. In case the syntax is to be retrieved from the root Term, 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 Term
      Parameters:
      aCliCtx - The CliContext for which the syntax is being generated.
      Returns:
      The human readable (verbose) command line arguments syntax.

    • approve

      protected void approve()
      In case this Term participated in successful parsing command line arguments, then this Term gets approved by the ArgsParser. An approval my trigger actions such as notifying registered lambda expressions upon approval,

    • setParsedArgs

      protected void setParsedArgs(String[] aArgs)
      Sets the command line argument(s) representing the Operand and its value as parsed by the parseArgs(String[], String[], CliContext) method.
      Parameters:
      aArgs - The command line arguments representing this Operand with its value.

    • setValue

      protected void setValue(T aValue)
      Sets the value for the Operand as parsed by the parseArgs(String[], String[], CliContext) method.
      Parameters:
      aValue - The value to be set for this Operand.

    • toType

      protected abstract T 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.
      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

    • getException

      public ArgsSyntaxException getException()
      Retrieves the ArgsSyntaxException exception in case invoking Term.parseArgs(String[], CliContext) failed. The exception (and the according suppressed ones alongside the causes) does not necessarily have been thrown by the Term.parseArgs(String[], CliContext) method depending on the semantics of the Term handing the exception (the AnyCondition provides any exceptions it caught even though it did not throw them as of its semantics).
      Specified by:
      getException in interface org.refcodes.exception.ExceptionAccessor<ArgsSyntaxException>
      Specified by:
      getException in interface Term
      Returns:
      The ArgsSyntaxException exception occurring while parsing the arguments.

    • toArgsDiff

      protected static String[] toArgsDiff(String[] aArgs, List<? extends Operand<?>> aArgsSubset)
      Creates the difference between the provided set and the provided Lists therein found argument arrays subset (as of Operand.getArgs()).
      Parameters:
      aArgs - The set to be used for the diff operation.
      aArgsSubset - The subset to be used for the diff operation being the lists containing the Operand instances whose command line arguments are to be diffed.
      Returns:
      The difference between the set and the subset.

    • toArgsDiff

      protected static String[] toArgsDiff(String[] aArgs, Operand<?>[] aArgsSubset)
      Creates the difference between the provided set and the provided Lists therein found argument arrays subset (as of Operand.getArgs()).
      Parameters:
      aArgs - The set to be used for the diff operation.
      aArgsSubset - The subset to be used for the diff operation being the lists containing the Operand instances whose command line arguments are to be diffed.
      Returns:
      The difference between the set and the subset.

    • toArgsDiff

      protected static String[] toArgsDiff(String[] aArgs, String[] aArgsSubset)
      Creates the difference between the provided set and the provided subset.
      Parameters:
      aArgs - The set to be used for the diff operation.
      aArgsSubset - The subset to be used for the diff operation.
      Returns:
      The difference between the set and the subset.

    • toParsedArgs

      protected static String[] toParsedArgs(Operand<?>[]... aOperands)
      Takes all Operand instances found in the provided Lists and adds all therein found argument arrays (as of Operand.getArgs()) to the result.
      Parameters:
      aOperands - The lists containing the Operand instances whose command line arguments are to be added to the result.
      Returns:
      All the command line arguments detected in the provided Operands Lists.