Package net.ssehub.easy.varModel.model.values

Class NullValue

java.lang.Object
net.ssehub.easy.varModel.model.values.Value
net.ssehub.easy.varModel.model.values.NullValue
public final class NullValue extends Value
Defines the null value. The null value is instance of AnyType.
Author:
Holger Eichelberger

  • Field Details

    • INSTANCE

      public static final Value INSTANCE
      The only instance of the null value.

    • VALUE

      public static final Object VALUE
      The value to be returned by getValue(). null would be an alternative but this may break existing code.

  • Constructor Details

    • NullValue

      private NullValue()
      Creates a null value. Not visible due to singleton constant character.

  • Method Details

    • getValue

      public Object getValue()
      Description copied from class: Value
      Abstract getValue method. The result of this method must comply to the input conventions of ValueFactory and the constructor of the respective implementing class.
      Specified by:
      getValue in class Value
      Returns:
      the Value of the Datatype

    • accept

      public void accept(IValueVisitor visitor)
      Description copied from class: Value
      Abstract accept method.
      Specified by:
      accept in class Value
      Parameters:
      visitor - The visitor

    • setValue

      public void setValue(Object value) throws ValueDoesNotMatchTypeException
      Description copied from class: Value
      Abstract setValue-method.
      Specified by:
      setValue in class Value
      Parameters:
      value - the value to set.
      Throws:
      ValueDoesNotMatchTypeException - if the given value does not match this type

    • isConfigured

      public boolean isConfigured()
      Description copied from class: Value
      Abstract Method to check whether a value is configured.
      Specified by:
      isConfigured in class Value
      Returns:
      true = it is configured / false = it is not

    • clone

      public Value clone()
      Description copied from class: Value
      Clones the this value.
      Overrides:
      clone in class Value
      Returns:
      the clone of the value

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Value

    • equals

      public boolean equals(Object other)
      Overrides:
      equals in class Value

    • toString

      public String toString()
      Overrides:
      toString in class Value

    • equalsPartially

      public boolean equalsPartially(Value value)
      Description copied from class: Value
      Returns whether the provided value is partially equal to this value, i.e., whether the nested elements of value (if they exist) have the same contents as in this value. Other values of this value are not considered. The check is transitive on nested elements. Please consider that this method is not symmetric as opposed to equals. This method is important to cope with default values.
      Specified by:
      equalsPartially in class Value
      Parameters:
      value - the value to be checked for partial equality.
      Returns:
      true if value is partially equal to this, false else