Bug 210507 Enhance Report engine to support multiple view
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/parser/EngineIRVisitor.java
else
		{
			
			return null;
		}
		return rule;
	}
	/**
	 * Checks if a given style is in report's style list, if not, assign a
	 * unique name to it and then add it to the style list.
	 * 
	 * @param style
	 *            The <code>StyleDeclaration</code> object.
	 * @return the name of the style.
	 */
	private String assignStyleName( StyleDeclaration style )
	{
		if ( style == null || style.isEmpty( ) )
		{
			return null;
		}
		
		Map styles = report.getStyles( );
		Iterator iter = styles.entrySet( ).iterator( );
		while ( iter.hasNext( ) )
		{
			Map.Entry entry = (Map.Entry) iter.next( );
			
			StyleDeclaration cachedStyle = (StyleDeclaration) entry.getValue( );
			if ( cachedStyle.equals( style ) )