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/ReferencableStructure.java
Object value = getLocalProperty( module, propDefn );
		if ( value != null )
			return value;
		
		
		
		if ( libReference != null && module != null )
		{
			ReferencableStructure refStruct = libReference.getTargetStructure( );
			if ( refStruct != null )
			{
				
				
				
				Library lib = module.getLibraryWithNamespace( libReference
						.getLibraryNamespace( ), IModuleNameSpace.DIRECTLY_INCLUDED_LEVEL );
				Module root = lib == null ? module : lib;
				value = refStruct.getProperty( root, propDefn );
				if ( value != null )
					return value;
			}
		}
		if ( value == null )
			return propDefn.getDefault( );
		return value;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.core.Structure#getLocalProperty(org.eclipse.birt.report.model.core.Module,