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/command/PropertyCommand.java
PropertyDefn memberDefn = (PropertyDefn) iter.next( );
			if ( !ReferencableStructure.LIB_REFERENCE_MEMBER.equals( memberDefn
					.getName( ) ) )
				item.setProperty( memberDefn, memberDefn.validateValue( module,
						item.getLocalProperty( module, memberDefn ) ) );
		}
		if ( item instanceof Structure )
		{
			List errorList = ( (Structure) item ).validate( module, element );
			if ( errorList.size( ) > 0 )
			{
				throw (SemanticException) errorList.get( 0 );
			}
		}
	}
	/**
	 * Adds an item to a property list.
	 * <ul>
	 * <li>If the property is currently unset anywhere up the inheritance
	 * hierarchy, then a new list is created on this element, and the list
	 * contains the only the new item.</li>
	 * <li>If the property is currently set on this element, then the item is
	 * added to the existing list.</li>
	 * <li>If the list is not set on this element, but is set by an ancestor
	 * element, then the list is <strong>copied </strong> onto this element, and
	 * the new element is then appended to the copy.</li>
	 * </ul>
	 * 
	 * @param prop
	 *            the property definition whose type is list