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/DesignElement.java
}
		
		if ( prop.getTypeCode( ) == PropertyType.STRUCT_REF_TYPE )
		{
			return resolveStructReference( module, prop );
		}
		if ( prop.getTypeCode( ) == PropertyType.LIST_TYPE
				&& prop.getSubTypeCode( ) == PropertyType.ELEMENT_REF_TYPE )
		{
			return resolveElementReferenceList( module, prop );
		}
		
		return propValues.get( prop.getName( ) );
	}
	/**
	 * Returns the value of an intrinsic property. Derived classes should
	 * override this to handle their own intrinsics. Clients should call the
	 * getProperty( ) or getLocalProperty( ) methods instead of calling this
	 * method directly.
	 * 
	 * @param propName
	 *            name of the intrinsic
	 * @return the value of the requested property
	 */
	protected Object getIntrinsicProperty( String propName )
	{
		if ( NAME_PROP.equals( propName ) )
			return name;
		if ( EXTENDS_PROP.equals( propName ) )
		{