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
* 1.
	 * 
	 * @param request
	 *            http request
	 * @return report page number
	 */
	public static int getPage( HttpServletRequest request )
	{
		int page = getParameterAsInt( request, PARAM_PAGE );
		if ( page > 0 )
			return page;
		String servletPath = request.getServletPath( );
		if ( IBirtConstants.SERVLET_PATH_FRAMESET
				.equalsIgnoreCase( servletPath )
				&& PARAM_FORMAT_HTML.equalsIgnoreCase( getFormat( request ) ) )
		{
			page = 1;
		}
		else
		{
			page = 0;
		}
		return page;
	}
	/**
	 * Get report page range from Http request.
	 * 
	 * @param request
	 *            http request
	 * @return report page range