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/ElementRefPropertyType.java
* Resolves an element reference. Look up the name in the name space of the
	 * target element type. If the target is found, replace the element name
	 * with the cached element.
	 * 
	 * @param module
	 *            the report design
	 * @param defn
	 *            the definition of the element ref property
	 * @param ref
	 *            the element reference
	 */
	public void resolve( Module module, PropertyDefn defn, ElementRefValue ref )
	{
		if ( ref.isResolved( ) )
			return;
		ElementDefn targetDefn = (ElementDefn) defn.getTargetElementType( );
		
		
		
		
		IModuleNameSpace elementResolver = module
				.getModuleNameSpace( targetDefn.getNameSpaceID( ) );
		String name = ReferenceValueUtil.needTheNamespacePrefix( ref, module );
		
		DesignElement target = null;
		target = elementResolver.resolve( name, defn ).getElement( );
		if ( target != null )
			ref.resolve( target );
	}
}