Bug 150347 Support binary stream as preview image.
See 144843. We need model to save binary strame as report preview image. Currently, preview image is an external image. Maybe need a type to distinguish preview image type.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ReportDesignHandle.java
/**
	 * Sets the script called at the end of the Factory after closing the report
	 * document (if any). This is the last method called in the Factory.
	 * 
	 * @param value
	 *            the script to set.
	 */
	public void setAfterFactory( String value )
	{
		try
		{
			setStringProperty( AFTER_FACTORY_METHOD, value );
		}
		catch ( SemanticException e )
		{
			assert false;
		}
	}
	/**
	 * Sets the script called after starting a presentation time action.
	 * 
	 * @param value
	 *            the script to set.
	 */
	public void setAfterRender( String value )
	{
		try
		{
			setStringProperty( AFTER_RENDER_METHOD, value );
		}