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/PropertySearchStrategy.java
return null;
		}
		
		
		DesignElement e = element;
		Object value = null;
		while ( e != null )
		{
			
			value = e.getStrategy( ).getPropertyFromElement( module, e, prop );
			if ( value != null )
				return value;
			if ( !e.getStrategy( ).isInheritableProperty( e, prop )
					|| !prop.isStyleProperty( ) || e.isStyle( ) )
				break;
			
			value = e.getStrategy( ).getPropertyRelatedToContainer( module, e,
					prop );
			if ( value != null )
				return value;
			
			
			e = e.getContainer( );
		}
		
		return getSessionDefaultValue( module, prop );
	}
	/**
	 * Gets a property value given its definition. This version does the
	 * property search as defined by the given derived component. That is, it