Java tutorial
/** * The contents of this file are subject to the Mozilla Public License * Version 1.1 (the "License"); you may not use this file except in * compliance with the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the * License for the specific language governing rights and limitations under * the License. * * The Original Code is OpenELIS code. * * Copyright (C) The Minnesota Department of Health. All Rights Reserved. */ package us.mn.state.health.lims.common.action; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.beanutils.PropertyUtils; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.action.DynaActionForm; import us.mn.state.health.lims.common.dao.BaseDAO; import us.mn.state.health.lims.common.exception.LIMSRuntimeException; import us.mn.state.health.lims.common.log.LogEvent; import us.mn.state.health.lims.common.util.SystemConfiguration; public abstract class BaseMenuAction extends BaseAction implements IActionConstants { protected static final int PREVIOUS = 1; protected static final int NEXT = 2; protected static final int NONE = -1; protected int getPageSize() { return SystemConfiguration.getInstance().getDefaultPageSize(); } protected ActionForward performAction(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { String forward = FWD_SUCCESS; DynaActionForm dynaForm = (DynaActionForm) form; int action = -1; if (request.getParameter("paging") != null) { action = Integer.parseInt((String) request.getParameter("paging")); } List menuList = null; try { switch (action) { case PREVIOUS: menuList = doPreviousPage(mapping, form, request, response); break; case NEXT: menuList = doNextPage(mapping, form, request, response); break; default: menuList = doNone(mapping, form, request, response); } } catch (Exception e) { LogEvent.logError("BaseMenuAction", "performAction()", e.toString()); forward = FWD_FAIL; } dynaForm.initialize(mapping); PropertyUtils.setProperty(dynaForm, "menuList", menuList); request.setAttribute(DEACTIVATE_DISABLED, getDeactivateDisabled()); request.setAttribute(ADD_DISABLED, getAddDisabled()); request.setAttribute(EDIT_DISABLED, getEditDisabled()); String[] selectedIDs = new String[5]; PropertyUtils.setProperty(dynaForm, "selectedIDs", selectedIDs); return mapping.findForward(forward); } protected List doNextPage(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { int startingRecNo = getCurrentStartingRecNo(request); LogEvent.logDebug("BaseMenuAction", "performAction()", "current start " + startingRecNo); int nextStartingRecNo = startingRecNo + getPageSize(); LogEvent.logDebug("BaseMenuAction", "performAction()", "next start " + nextStartingRecNo); String stringNextStartingRecNo = String.valueOf(nextStartingRecNo); request.setAttribute("startingRecNo", stringNextStartingRecNo); List nextPageList = createMenuList(mapping, form, request, response); request.setAttribute(PREVIOUS_DISABLED, "false"); if (nextPageList.size() > getPageSize()) { request.setAttribute(NEXT_DISABLED, "false"); // chop off last record (this was only to indicate that there are // more records nextPageList = nextPageList.subList(0, getPageSize()); } else { request.setAttribute(NEXT_DISABLED, "true"); } return nextPageList; } protected List doPreviousPage(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { int startingRecNo = getCurrentStartingRecNo(request); int nextStartingRecNo = startingRecNo - getPageSize(); String stringNextStartingRecNo = String.valueOf(nextStartingRecNo); request.setAttribute("startingRecNo", stringNextStartingRecNo); List previousPageList = createMenuList(mapping, form, request, response); request.setAttribute(NEXT_DISABLED, "false"); if (previousPageList.size() > getPageSize()) { request.setAttribute(PREVIOUS_DISABLED, "false"); // chop off last record (this was only to indicate that there are // more records previousPageList = previousPageList.subList(0, getPageSize()); } else { request.setAttribute(PREVIOUS_DISABLED, "true"); } if (nextStartingRecNo <= 1) { request.setAttribute(PREVIOUS_DISABLED, "true"); } return previousPageList; } protected List doNone(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { int startingRecNo = getCurrentStartingRecNo(request); int nextStartingRecNo = startingRecNo; String stringNextStartingRecNo = String.valueOf(nextStartingRecNo); request.setAttribute("startingRecNo", stringNextStartingRecNo); List samePageList = createMenuList(mapping, form, request, response); // this is first page: don't enable previous button if (nextStartingRecNo <= 1) { request.setAttribute(PREVIOUS_DISABLED, "true"); } if (samePageList.size() > getPageSize()) { request.setAttribute(NEXT_DISABLED, "false"); // chop off last record (this was only to indicate that there are // more records samePageList = samePageList.subList(0, getPageSize()); } else { request.setAttribute(NEXT_DISABLED, "true"); } return samePageList; } protected int getCurrentStartingRecNo(HttpServletRequest request) { String stringStartingRecNo = "1"; if (request.getAttribute("startingRecNo") != null) { stringStartingRecNo = (String) request.getAttribute("startingRecNo"); } else if (request.getParameter("startingRecNo") != null) { stringStartingRecNo = (String) request.getParameter("startingRecNo"); } int startingRecNo = Integer.parseInt(stringStartingRecNo); return startingRecNo; } protected abstract List createMenuList(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception; protected abstract String getDeactivateDisabled(); protected String getAddDisabled() { return "false"; } protected String getEditDisabled() { return "false"; } protected void setDisplayPageBounds(HttpServletRequest request, int listSize, int startingRecNo, BaseDAO DAO, Class valueClass) throws LIMSRuntimeException { request.setAttribute(MENU_TOTAL_RECORDS, String.valueOf(DAO.getTotalCount(valueClass.getName(), valueClass))); request.setAttribute(MENU_FROM_RECORD, String.valueOf(startingRecNo)); int numOfRecs = 0; if (listSize != 0) { numOfRecs = Math.min(listSize, getPageSize()); numOfRecs--; } int endingRecNo = startingRecNo + numOfRecs; request.setAttribute(MENU_TO_RECORD, String.valueOf(endingRecNo)); } protected void setDisplayPageBounds(HttpServletRequest request, int listSize, int startingRecNo, int totalRecords) throws LIMSRuntimeException { request.setAttribute(MENU_TOTAL_RECORDS, String.valueOf(totalRecords)); request.setAttribute(MENU_FROM_RECORD, String.valueOf(startingRecNo)); int numOfRecs = 0; if (listSize != 0) { numOfRecs = Math.min(listSize, getPageSize()); numOfRecs--; } int endingRecNo = startingRecNo + numOfRecs; request.setAttribute(MENU_TO_RECORD, String.valueOf(endingRecNo)); } }