Bug 188596 Some parameter value cannot be passed to report through URL[0002]
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ScalarParameterBean.java
*/
	private String defaultDisplayText = null;
	/**
	 * If it is cascade parameter.
	 */
	private boolean isCascade = false;
	/**
	 * If default value is in the selection list
	 */
	private boolean defaultValueInList = false;
	/**
	 * If display text is in request
	 */
	private boolean displayTextInReq = false;
	/**
	 * Constructor.
	 * 
	 * @param parameter
	 */
	public ScalarParameterBean( ParameterDefinition parameter )
	{
		this.parameter = parameter;
	}
	/**
	 * Adapt to IScalarParameterDefn's allowNull( ).
	 * 
	 * @deprecated
	 * @return whether parameter value allows null.
	 */
	public boolean allowNull( )