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/metadata/ElementDefn.java
if ( slots == null )
			return;
		for ( int i = 0; i < slots.size( ); i++ )
		{
			SlotDefn slot = (SlotDefn) slots.get( i );
			slot.setSlotID( i );
			slot.build( );
		}
	}
	/**
	 * Returns a list of the localized property group names defined by this
	 * element and its parents.
	 * <p>
	 * The UI uses property groups to organize properties within the generic
	 * property sheet.
	 * 
	 * @return The list of group names. If there is no groups defined on the
	 *         element, the list will has no content.
	 */
	public List getGroupNames( )
	{
		
		ArrayList groupNames = new ArrayList( );
		Iterator iter = getProperties( ).iterator( );
		while ( iter.hasNext( ) )
		{
			SystemPropertyDefn prop = (SystemPropertyDefn) iter.next( );
			String groupName = prop.getGroupName( );
			if ( groupName != null && !groupNames.contains( groupName ) )
			{