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
Object value = getProperty( module, prop );
		if ( value == null )
			return null;
		return prop.getDisplayValue( module, value );
	}
	/**
	 * Sets an unresolved extends name. The resolved relationships is not
	 * cached; it must be resolved later.
	 * 
	 * @param name
	 *            the name of the new parent element, or null if this element
	 *            does not extend any other element
	 */
	public void setExtendsName( String name )
	{
		setExtendsElement( null );
		name = StringUtil.trimString( name );
		if ( name == null )
			return;
		String namespace = StringUtil.extractNamespace( name );
		name = StringUtil.extractName( name );
		extendsRef = new ElementRefValue( namespace, name );
	}
	/**
	 * Validates this element and its contents.
	 * 
	 * @param module
	 *            the module
	 * @return the list of the errors found in validation, each of which is the
	 *         <code>SemanticException</code> object.