Package org.parboiled.common

Class Reference<T>

java.lang.Object
org.parboiled.common.Reference<T>
Type Parameters:
T -
Direct Known Subclasses:
Var
public class Reference<T> extends Object
A simple container holding a reference to another object.

  • Constructor Summary

    Constructors
    Constructor
    Description
    Reference()
    Create a new Reference with a null value.
    Reference(T value)
    Create a new Reference to the given value object.

  • Method Summary

    Modifier and Type
    Method
    Description
    boolean
    clear()
    Sets this references value field to null.
    T
    get()
    Retrieves this references value object.
    T
    getAndClear()
    Retrieves this references value field and clears it.
    T
    getAndSet(T value)
    Replaces this references value with the given one.
    boolean
    isNotSet()
     
    boolean
    isSet()
     
    boolean
    set(T value)
    Sets this references value object to the given instance.
    T
    setAndGet(T value)
    Replaces this references value with the given one.

    Methods inherited from class java.lang.Object

    equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Reference

      public Reference()
      Create a new Reference with a null value.

    • Reference

      public Reference(T value)
      Create a new Reference to the given value object.
      Parameters:
      value - the value object

  • Method Details

    • clear

      public boolean clear()
      Sets this references value field to null.
      Returns:
      true

    • set

      public boolean set(T value)
      Sets this references value object to the given instance.
      Parameters:
      value - the value
      Returns:
      true

    • get

      public T get()
      Retrieves this references value object.
      Returns:
      the target

    • getAndClear

      public T getAndClear()
      Retrieves this references value field and clears it. Equivalent to getAndSet(null).
      Returns:
      the target

    • getAndSet

      public T getAndSet(T value)
      Replaces this references value with the given one.
      Parameters:
      value - the new value
      Returns:
      the previous value

    • setAndGet

      public T setAndGet(T value)
      Replaces this references value with the given one.
      Parameters:
      value - the new value
      Returns:
      the new value

    • isSet

      public boolean isSet()
      Returns:
      true if this Reference holds a non-null value

    • isNotSet

      public boolean isNotSet()
      Returns:
      true if this Reference holds a null value