com.evrythng.commons.Ref Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of evrythng-commons Show documentation

Public common EVRYTHNG classes.

There is a newer version: 1.33

/*
 * (c) Copyright 2012 EVRYTHNG Ltd London / Zurich
 * www.evrythng.com
 */
package com.evrythng.commons;

/**
 * Class that holds a value. Useful for passing arguments by reference.
 * 
 * @author Michel Yerly (my)
 **/
public final class Ref {

	private T obj = null;

	/**
	 * Creates an instance that holds the null value.
	 */
	public Ref() {
	}

	/**
	 * Creates an instance that holds the specified value.
	 */
	public Ref(final T obj) {
		this.obj = obj;
	}

	/**
	 * Gets the value held.
	 */
	public final T get() {
		return obj;
	}

	/**
	 * Sets the value to hold.
	 */
	public final void set(final T obj) {
		this.obj = obj;
	}

	/**
	 * Null-safe setter.
	 */
	public static  void set(Ref ref, T obj) {
		if (ref != null) {
			ref.set(obj);
		}
	}
}