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Jing is a validator for RELAX NG and other schema languages. This project was taken from http://code.google.com/p/jing-trang and mavenized for inclusion in the Wicket Stuff HTML Validator. The code was taken from the 20091111 release.

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package com.thaiopensource.util;

/**
 * Simple generic class to hold a reference to an object.
 */
public class Ref {
  private T obj;

  public Ref() {
  }

  public Ref(T obj) {
    this.obj = obj;
  }

  public T get() {
    return obj;
  }

  public void set(T obj) {
    this.obj = obj;
  }

  public void clear() {
    this.obj = null;
  }
}