Bug 149251 Inconsistent Handling of a Non-inheritable ROM Property
For a ROM property defined to be non-inheritable, an empty string property value should be consistently handled as an empty string, not as null. For example, an oda.dataSource extension defines a data source property with canInherit=false. When a oda-data-source handle get saved in a report design, it correctly includes the tag for such property, even when an empty string value is specified. <oda-data-source extensionID="my.oda.plugin" name="my Data Source" id="24"> ... <property name="ApplicationServer"></property> </oda-data-source> However, later when using the DE API to read its property value, a null is returned. Then when the report design is subsequently saved, the property tag is lost. Expects that an empty string value of a non-inhertiable property should be preserved.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
/**
	 * Gets the root node of the design tree. This node must be a instance of
	 * <code>ReportDesign</code> or <code>Library</code>.
	 * 
	 * @return the root node of the design tree
	 */
	public Module getRoot( )
	{
		DesignElement element = this;
		while ( element.getContainer( ) != null )
			element = element.getContainer( );
		if ( element instanceof Module == false )
			return null;
		return (Module) element;
	}
	/**
	 * Implements to broadcast an event to all listeners of this design element.
	 * Implementations of sendEvent( ) call this to do the actual work of
	 * broadcasting.
	 * <p>
	 * Part of: Notification system.
	 * 
	 * @param ev
	 *            the event to send
	 */
	public final void broadcast( NotificationEvent ev )
	{
		if ( this instanceof Module || getContainer( ) != null )
			broadcast( ev, getRoot( ) );
	}