Bug 176681 Issue about creating context-parameter path in read-only path[0601]
Description: Issue about creating context-parameter path in read-only path Build number:2.2.0.v20070308 Steps to reproduce: 1. Deploy birt. 2. Set BIRT_VIEWER_DOCUMENT_FOLDER/BIRT_VIEWER_IMAGE_DIR/.. to a read-only path. 3. Preview report. Expected result: Because the path is read-only, folders should be created in ${java.io.tmpdir} Actual result: No folders are created in ${java.io.tmpdir} and reports cannot be previewed in frameset mode.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
}
	/**
	 * Get result set name.
	 * 
	 * @param request
	 * @return
	 */
	public static String getResultSetName( HttpServletRequest request )
	{
		return getReportParameter( request, PARAM_RESULTSETNAME, null );
	}
	/**
	 * Get solected column name list.
	 * 
	 * @param request
	 * @return
	 */
	public static Collection getSelectedColumns( HttpServletRequest request )
	{
		ArrayList columns = new ArrayList( );
		int columnCount = getParameterAsInt( request,
				PARAM_SELECTEDCOLUMNNUMBER );
		for ( int i = 0; i < columnCount; i++ )
		{
			String paramName = PARAM_SELECTEDCOLUMN + String.valueOf( i );
			String columnName = getParameter( request, paramName );
			columns.add( columnName );
		}
		return columns;
	}