Class CacheValue.NullValue<V>

  • Enclosing class:
    CacheValue<V>

    private static final class CacheValue.NullValue<V>
    extends CacheValue<V>
    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private NullValue()  
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      V get()
      Returns the value (which can be null), or null if it was held in a Reference and has been cleared.
      boolean isNull()
      Distinguishes a null value from a Reference value that has been cleared.
      V resetIfCleared​(V value)
      If the value was held via a Reference which has been cleared, then it is replaced with a new Reference to the new value, and the new value is returned.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • NullValue

        private NullValue()
    • Method Detail

      • isNull

        public boolean isNull()
        Description copied from class: CacheValue
        Distinguishes a null value from a Reference value that has been cleared.
        Overrides:
        isNull in class CacheValue<V>
        Returns:
        true if this object represents a null value.
      • get

        public V get()
        Description copied from class: CacheValue
        Returns the value (which can be null), or null if it was held in a Reference and has been cleared.
        Specified by:
        get in class CacheValue<V>
      • resetIfCleared

        public V resetIfCleared​(V value)
        Description copied from class: CacheValue
        If the value was held via a Reference which has been cleared, then it is replaced with a new Reference to the new value, and the new value is returned. The old and new values should be the same or equivalent.

        Otherwise the old value is returned.

        Specified by:
        resetIfCleared in class CacheValue<V>
        Parameters:
        value - Replacement value, for when the current Reference has been cleared.
        Returns:
        The old or new value.