/**
      * Constructs an instance of a Binding given its 
      * name, class name, object, and whether the name is relative.
      *
      * @param	name	The non-null string name of the object.
      * @param	className	The possibly null class name of the object 
      * 	bound to <tt>name</tt>. If null, the class name of <tt>obj</tt> is
      *		returned by <tt>getClassName()</tt>. If <tt>obj</tt> is also
      *		null, <tt>getClassName()</tt> will return null.
      * @param	obj	The possibly null object bound to name.
      * @param isRelative true if <code>name</code> is a name relative
      *		to the target context (which is named by
      *         the first parameter of the <code>listBindings()</code> method);
      *         false if <code>name</code> is a URL string.
      * @see NameClassPair#isRelative
      * @see NameClassPair#setRelative
      * @see NameClassPair#setClassName
      */
    public Binding(String name, String className, Object obj, boolean isRelative) {
	super(name, className, isRelative);
	this.boundObj = obj;
    }

    /**
      * Retrieves the class name of the object bound to the name of this binding.
      * If the class name has been set explicitly, return it.
      * Otherwise, if this binding contains a non-null object, 
      * that object's class name is used. Otherwise, null is returned.
      * 
      * @return	A possibly null string containing class name of object bound.
      */
    public String getClassName() {
	String cname = super.getClassName();
	if (cname != null) {
	    return cname;
	}
	if (boundObj != null)
	    return boundObj.getClass().getName();
	else
	    return null;
    }

    /**
      * Retrieves the object bound to the name of this binding.
      *
      * @return	The object bound; null if this binding does not contain an object.
      * @see #setObject
      */

    public Object getObject() {
	return boundObj;
    }

    /**
     * Sets the object associated with this binding.
     * @param obj The possibly null object to use.
     * @see #getObject
     */
    public void setObject(Object obj) {
	boundObj = obj;
    }

    /**
      * Generates the string representation of this binding.
      * The string representation consists of the string representation
      * of the name/class pair and the string representation of
      * this binding's object, separated by ':'.
      * The contents of this string is useful
      * for debugging and is not meant to be interpreted programmatically.
      *
      * @return The non-null string representation of this binding.
      */

    public String toString() {
	return super.toString() + ":" + getObject();
    }

    /**
     * Use serialVersionUID from JNDI 1.1.1 for interoperability
     */
    private static final long serialVersionUID = 8839217842691845890L;
};