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
/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.metadata.ObjectDefn#buildDefn()
	 */
	protected void buildDefn( ) throws MetaDataException
	{
		
		MetaDataDictionary dd = MetaDataDictionary.getInstance( );
		if ( extendsFrom != null )
		{
			parent = (ElementDefn) dd.getElement( extendsFrom );
			if ( parent == null )
				throw new MetaDataException(
						new String[]{extendsFrom, name},
						MetaDataException.DESIGN_EXCEPTION_ELEMENT_PARENT_NOT_FOUND );
			parent.build( );
			
			
			
			
			if ( parent.hasStyle( ) )
				hasStyle = true;
		}
		
		
		if ( ( parent == null || !parent.hasStyle( ) ) && hasStyle )
		{
			SystemPropertyDefn prop = new SystemPropertyDefn( );
			prop.setName( StyledElement.STYLE_PROP );