Package ml.options

Class ExclusiveConstraint

java.lang.Object
ml.options.ExclusiveConstraint
All Implemented Interfaces:
Constraint, XMLConstraint

public class ExclusiveConstraint extends Object implements XMLConstraint
A constraint combining one or more options such that just one of them can occur. This type of constraint can only be added to an option set as it combines one or more options.

Constraints of this kind are also accounted for in the DefaultHelpPrinter to format the output provided.

  • Constructor Details

    • ExclusiveConstraint

      public ExclusiveConstraint()
      The public no-org constructor. This is a prereq for all constraints since it is used for initialization based on XML data.
  • Method Details

    • init

      public void init(Constrainable constrainable, List<org.jdom.Element> list)
      This method is used to initialize this constraint based on data read from an XML configuration file. The method is invoked internally during setup with the instance of Constrainable to which the constraint applies and a list of JDOM elements, which contain the details about the constraint itself.

      This method initializes the constraint and attaches it to the list of constraints of the Constrainable instance.

      The parameters expected in the XML <param> tags for this constraint are

      Name Value Status
      keys Same as the keys parameter in add(OptionSet, Options.Multiplicity, String[]) Required
      mult Same as the multiplicity parameter in add(OptionSet, Options.Multiplicity, String[]) Optional

      Specified by:
      init in interface XMLConstraint
      Parameters:
      constrainable - The Constrainable instance to which this constraint applies
      list - A list of JDOM elements to be used to initialize the constraint. Specifically, these are tags of the form

      <param name="..." value="..." />

      containing key/value pairs with information.

    • add

      public static void add(OptionSet optionSet, Options.Multiplicity multiplicity, String... keys)
      Add a constraint to the given option set

      Parameters:
      optionSet - The OptionSet to add this constraint to
      multiplicity - The Options.Multiplicity to use for all options tied together by these constraints. A Multiplicity defined previously for any option contained in this constraint is overridden.
      keys - The keys of the options to tie together by this constraint. At least two keys must be given here, and the corresponding options must already be defined in the set.
    • add

      public static void add(OptionSet optionSet, String... keys)
      Add a constraint to the given option set using the default multiplicity defined for this set

      Parameters:
      optionSet - The OptionSet to add this constraint to
      keys - The keys of the options to tie together by this constraint. At least two keys must be given here, and the corresponding options must already be defined in the set.
    • supports

      public boolean supports(Constrainable constrainable)
      Indicates whether a constraint supports a given type of Constrainable

      Specified by:
      supports in interface Constraint
      Parameters:
      constrainable -
      Returns:
      A boolean to indicate whether this Constrainable is supported. This constraint only supports OptionSet constrainables
    • isSatisfied

      public boolean isSatisfied()
      The actual check routine

      Specified by:
      isSatisfied in interface Constraint
      Returns:
      A boolean indicating whether the constraint is satisfied or not
    • toString

      public String toString()
      This is the overloaded Object.toString() method

      Overrides:
      toString in class Object
      Returns:
      A string representing the instance