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
continue;
				SystemPropertyDefn prop = (SystemPropertyDefn) style
						.getProperty( propName );
				
				
				
				
				
				
				if ( prop == null )
					throw new MetaDataException(
							new String[]{propName, name},
							MetaDataException.DESIGN_EXCEPTION_STYLE_PROP_NOT_FOUND );
				assert prop.isStyleProperty( );
				
				
				properties.put( prop.getName( ), prop );
			}
		}
	}
	/**
	 * Builds the meta-data for each slotID in this container element.
	 * 
	 * @throws MetaDataException
	 *             if build of any slot failed.
	 */
	protected void buildSlots( ) throws MetaDataException
	{
		if ( slots != null && slots.size( ) == 0 )
			slots = null;