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
element.cachedDefn = null;
		element.handle = null;
		element.propValues = new HashMap( );
		if ( extendsRef != null )
			element.extendsRef = (ElementRefValue) this.extendsRef.copy( );
		Iterator iter = null;
		if ( !isVirtualElement( ) && userProperties != null )
		{
			element.userProperties = new LinkedHashMap( );
			iter = userProperties.keySet( ).iterator( );
			while ( iter.hasNext( ) )
			{
				Object key = iter.next( );
				UserPropertyDefn uDefn = (UserPropertyDefn) userProperties
						.get( key );
				element.userProperties.put( key, uDefn.copy( ) );
			}
		}
		iter = propValues.keySet( ).iterator( );
		while ( iter.hasNext( ) )
		{
			String key = (String) iter.next( );
			PropertyDefn propDefn = getPropertyDefn( key );
			Object value = propValues.get( key );
			element.propValues
					.put( key, ModelUtil.copyValue( propDefn, value ) );
		}
		return element;
	}
}