Bug 138562 Splite extendsexcpetion to seperate sub class
The suggestion is Parent invalid Cycle extends Different type extends Not top level extends
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/elements/OdaDataSource.java
}
	/**
	 * Returns an API handle for this element.
	 * 
	 * @param module
	 *            the report design
	 * @return an API handle for this element
	 */
	public OdaDataSourceHandle handle( Module module )
	{
		if ( handle == null )
		{
			handle = new OdaDataSourceHandle( module, this );
		}
		return (OdaDataSourceHandle) handle;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.extension.IExtendable#getExtDefn()
	 */
	public ExtensionElementDefn getExtDefn( )
	{
		if ( provider != null )
			return provider.getExtDefn( );
		return null;
	}
	/*
	 * (non-Javadoc)
	 *