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
}
	/**
	 * Adds an invisible property to the list.
	 * 
	 * @param propName
	 *            the property name
	 * @param propVisibility
	 *            the level that how to show the property in the property sheet.
	 */
	public void addPropertyVisibility( String propName, String propVisibility )
	{
		if ( propVisibilites == null )
			propVisibilites = new HashMap( );
		propVisibilites.put( propName, propVisibility );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.metadata.IElementDefn#isPropertyReadOnly(java.lang.String)
	 */
	public boolean isPropertyReadOnly( String propName )
	{
		IPropertyDefn propDefn = getProperty( propName );
		if ( propDefn == null )
			return true;
		String visibility = getPropertyVisibility( propDefn.getName( ) );
		if ( READONLY_IN_PROPERTY_SHEET.equals( visibility ) )
			return true;
		return false;
	}