public NullProperty() 
{
		super();
}

 public NullProperty(String name) 
{
		super(name);
}

 public Object clone() 
{
		return this;
}

 public boolean getBooleanValue() 
{
		return false;
}

 public double getDoubleValue() 
{
		return 0;
}

 public float getFloatValue() 
{
		return 0;
}

 public int getIntValue() 
{
		return 0;
}

 public long getLongValue() 
{
		return 0;
}

 public Object getObjectValue() 
{
		return null;
}

 public String getStringValue() 
{
		if (tempValue != null) {
			return tempValue.getStringValue();
		}
		return "";
}

 public boolean isRunningVersion() 
{
		return false;
}

 public boolean isTemporary(TestElement owner) 
{
		return true;
}

see JMeterProperty#isTemporary(TestElement)

 public  void mergeIn(JMeterProperty prop) 
{
		tempValue = prop;
}

 public  void recoverRunningVersion(TestElement owner) 
{
		tempValue = null;
}

 public  void setObjectValue(Object v) 
{

}