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/PropertySearchStrategy.java
*/
	protected Object getPropertyFromSelf( Module module, DesignElement element,
			ElementPropertyDefn prop )
	{
		
		Object value = element.getLocalProperty( module, prop );
		if ( value != null )
			return value;
		
		StyleElement style = element.getStyle( module );
		if ( style != null )
		{
			value = style.getLocalProperty( module, prop );
			if ( value != null )
				return value;
		}
		return null;
	}
	/**
	 * Returns the property value from this element's parent, or its virtual
	 * parent. The value is only from local properties, or local style of its
	 * ancestor.
	 * 
	 * @param element
	 *            the element to start search parent
	 * @param module
	 *            module
	 * @param prop
	 *            definition of the property to get.
	 * @return property value, or <code>null</code> if no value is set.