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/ElementDefn.java
if ( !isAbstract( ) )
			checkJavaClass( );
		checkPropertyVisibilities( );
		buildSlots( );
		buildTriggerDefnSet( );
		isBuilt = true;
	}
	/**
	 * Checks the validation of the defined property visibilities. If the
	 * property with the name is not defined, then the visibility is illegal.
	 * 
	 * @throws MetaDataException
	 *             if the property definition is not found
	 */
	private void checkPropertyVisibilities( ) throws MetaDataException
	{
		if ( this.propVisibilites == null )
			return;
		Iterator propNames = this.propVisibilites.keySet( ).iterator( );
		while ( propNames.hasNext( ) )
		{
			String propName = (String) propNames.next( );
			
			if ( getProperty( propName ) == null )
				throw new MetaDataException(
						new String[]{name, propName},
						MetaDataException.DESIGN_EXCEPTION_VISIBILITY_PROPERTY_NOT_FOUND );
		}
	}