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
public Object validatePropertyValue( Module module, String propName,
			Object value ) throws PropertyNameException, PropertyValueException
	{
		
		
		ElementPropertyDefn prop = getPropertyDefn( propName );
		if ( prop == null )
			throw new PropertyNameException( this, propName );
		
		try
		{
			return prop.validateValue( module, value );
		}
		catch ( PropertyValueException e )
		{
			
			e.setElement( this );
			e.setPropertyName( propName );
			throw e;
		}
	}
	/**
	 * Returns the shared style referenced by this element. This method will try
	 * to resolve the style element if the value is un-resolved.
	 * <p>
	 * Part of: Style system.
	 * 
	 * @param module
	 *            module
	 * @return the shared style, or null if this element does not explicitly