mdkInventory1/ControllerServlet.java
package mdkInventory1;
import java.io.IOException;
import java.util.Vector;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import mdkInventory1.bean.BasicDataHandler;
import mdkInventory1.bean.TableViewDefinition;
import com.sap.ip.me.api.logging.AbstractLogging;
import com.sap.ip.me.api.logging.AppLog;
import com.sap.ip.me.api.logging.Severities;
import com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet;
import com.sap.ip.me.api.services.MEResourceBundle;
public class ControllerServlet extends AbstractMEHttpServlet implements Constants {
public static MEResourceBundle RESOURCE_BUNDLE;
private TableViewDefinition tableViewDefinition;
private BasicDataHandler dataHandler;
private String headLine;
private int start_index;
private int sort_index;
private boolean sort_ascending;
private String buttontext;
private String pageTitle;
private String currentPageFooter;
private String buttontextQuery;
private String filter_string;
private String current_filter_string;
private Vector commandLine = new Vector();
/**
* Must be overwritten - return the name of the application
*/
public String getApplicationName() {
return MI_APPLICATION_NAME;
}
/**
* doIntialize - called when the servlet is activated the first time
*/
public void doInitialize() throws ServletException {
// The Resource bundle is used to define the table headers. The bundle contains the field names
// (the names that come from the server and are defined in the merep.xml file) and as value it
// has the name that is displayed on the screen.
// If a field name is not defined in the bundle it is not displayed on the screen - that means the
// entire column is not displayed. This gives the opportunity to control, which columns should be displayed.
// The add.jsp also only displays fields that are defined in the bundle.
setResourceBundle("mdkInventory1.properties.inventory");
RESOURCE_BUNDLE = getResourceBundle();
setFilterOff();
// Prepare a log output - Level DEBUG - Information about classloader
ClassLoader cl = getClass().getClassLoader();
AbstractLogging aLogger = AppLog.getInstance(MI_APPLICATION_NAME);
aLogger.log(Severities.DEBUG, "MIClientInfo: Create MIClientInfoServlet.doInitialize with Classloader {0}", (cl == null ? "(null)" : cl.toString()));
// Setup Commands for this example. Commands are displayed on the top of the centerpage.
// In this example we use add, delete, filter and list all commands.
setCommands();
}
/**
* doHandleEvent - called any subsequent time when an event on the web client occurs.
*/
public String doHandleEvent(String eventName, HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// Set the name of the JSP that has to be called when this method is finished.
// INITIAL_JSP ist defined in the interface Constants.java and refers to welcome.jsp. This JSP displays a welcome message
// and asks for your name. Welcome.jsp has a submit button which generates the event EVENT_NAME. When this event occurs,
// the tableView.jsp is called and displays system information.
// The welcome.jsp is called by default - if the servlet is called the first time or an unknown event occurs.
// Set default JSP.
String nextJSP = INITIAL_JSP;
pageTitle = "Inventory Management";
currentPageFooter = "menu.jsp";
// Set default text for headline
headLine = WELCOME_MESSAGE;
// First we handle the events that have influence on the data provided by the dataHandler. These events are the
// navigation events and the sort event (by clicking in the product id header line).
// Once we handled the navigation and sortorder event, the variables like start_index, sort_ascending etc is
// set correctly and the getBeansFromContext can immediatly read the correct syncbos.
nextJSP = INITIAL_JSP;
// Sort order event
if (eventName.equals(EVENT_SORTBYPRODUCTID)) {
// Sort by Model has been clicked. The car attributes start with 0. Therefore we decrement I_MAKE by 1.
sort_index = I_PRODUCTID;
if (sort_ascending == true)
sort_ascending = false;
else
sort_ascending = true;
}
// Checking for navigation events
// First Page
if (eventName.equals(EVENT_FIRSTPAGE)) {
start_index = 0;
}
// Last Page
if (eventName.equals(EVENT_LASTPAGE)) {
start_index = ((dataHandler.getRowsInDataset() - 1) / MAX_TABLE_ROWS) * MAX_TABLE_ROWS;
}
if (eventName.equals(EVENT_PAGEUP)) {
if (start_index >= MAX_TABLE_ROWS)
start_index = start_index - MAX_TABLE_ROWS;
}
if (eventName.equals(EVENT_PAGEDOWN)) {
start_index = start_index + MAX_TABLE_ROWS;
}
// The "input" object with type = image in menu.jsp delivers the eventname with .x and .y appended to it
// So we check the beginning of the eventname.
if (eventName.startsWith(EVENT_GOTOPAGE)) {
String inputField = (String) request.getParameter("GOTO_PAGE");
int number = Integer.parseInt(inputField);
setCurrenPage(number);
}
//
// Events in add.jsp
// Add a new entry. Since the iterator has to refreshed as well, we also do this check before
// the getBeansFromContext method.
if (eventName.equals(EVENT_ADDENTRYSUBMIT)) {
// Event occurs when the submit button has been pressed on the ADD ENTRY JSP
addEntry(request);
}
//
// Events in query.jsp
// Set a filter string. Since the iterator has to refreshed as well, we also do this check before
// the getBeansFromContext method.
if (eventName.equals(EVENT_QUERYSUBMIT)) {
// Event occurs when the OK button has been pressed. The Filter string is set for the Query.
nextJSP = setFilter(request);
}
//
// We also check if the eventName is empty. An empty eventName means that the servlet has been called from
// the MI home page - in this case we have to to refresh the syncBo counter, because new data could have been
// synched from the server
// Because it is time consuming to get the number od syncbos we do not refresh the count all the time.
boolean refreshSyncBoCount = false;
if (eventName.trim().length() < 1) refreshSyncBoCount = true;
// Get bean, if there is one, in the session context, otherwise create a new instance.
// For the datahandler we always create a new instance to get the actual data.
getBeansFromContext(request, refreshSyncBoCount);
//
// Events in menu.jsp
if (eventName.equals(EVENT_ADDENTRY)) {
// Event occurs when the ADD button in menu.jsp has been pressed.
// We display add.jsp as next JSP.
pageTitle = "Add inventory item";
currentPageFooter = "add.jsp";
nextJSP = ADD_JSP;
}
if (eventName.equals(EVENT_QUERY)) {
// Event occurs when the FILTER button in menu.jsp has been pressed.
// We display query.jsp.
nextJSP = QUERY_JSP;
}
if (eventName.equals(EVENT_SAVE)) {
// Event occurs when the DELETE button in menu.jsp has been pressed.
nextJSP = saveEntries(request);
}
//
// Events from add.jsp or delete.jsp (Cancel event - is handled the same for both JSP
//
if (eventName.equals(EVENT_ADDENTRYCANCEL)) {
// Event occurs when the cancel button has been pressed on the ADD ENTRY JSP. No action. Show initial screen
nextJSP = INITIAL_JSP;
}
//
// Event in delete.jsp - is the OK button to acknowledge the information text
//
if (eventName.equals(EVENT_DELETEENTRYSUBMIT)) {
nextJSP = INITIAL_JSP;
}
//
// Event in query.jsp
//
if (eventName.equals(EVENT_QUERYCANCEL)) {
// Event occurs when the cancel button has been pressed on the Cancel button. No action. Show initial screen
nextJSP = INITIAL_JSP;
}
// Load bean with values from persistence layer
loadBean();
// Put bean in the session context.
putBeansIntoContext(request);
// Exit with name of JSP.
return nextJSP;
}
/**
* set the current page
* @param number - current page number
*/
private void setCurrenPage(int number) {
start_index = (number - 1) * MAX_TABLE_ROWS;
// If a page is specified that is higher than the maximum pages for the dataset
// we set the last page as current page
int max_index = ((dataHandler.getRowsInDataset() - 1) / MAX_TABLE_ROWS) * MAX_TABLE_ROWS;
if (start_index > max_index)
start_index = max_index;
// Check for negative page value - if so set frist page
if (start_index < 0)
start_index = 0;
}
/**
* @param eventName checks if event comes from table entry
* @return the true if detailpage should be called
*/
private boolean getDetailPage(String eventName) {
boolean detail = false;
// Check if event matches entry in frist column
for (int i = 0; i < dataHandler.getTableRows(); i++) {
if (eventName.equals(dataHandler.getCurrentSubTableContent(i, 0))) {
detail = true;
}
}
return detail;
}
/**
* Method saveEntries - saves the data
* @return String - next JSP to call.
*/
private String saveEntries(HttpServletRequest request) {
String nextJSP = null;
boolean valuesOK = true;
// We loop through all entries and check
// which row has been selected. If we find a selected row we delete the entry.
// We use the request.getParameter(valueOfCheckbox) method to find out which checkbox is clicked. The valueOfCheckbox
// is stored in the first column of the databean.
// If no row is selected we display a hint to select a row first.
for (int i = 0; i < dataHandler.getTableRows(); i++) {
String inputFieldString = (String) request.getParameter(dataHandler.getCurrentSubTableContent(i, 0));
if (inputFieldString != null) {
// Inputfield contains new amount for stock
String synckey = dataHandler.getCurrentSubTableContent(i, 0);
// If there is a synckey, get entry and check if value has been changed
if (synckey.length() > 0) {
String currentAmount = dataHandler.getCurrentSubTableContent(i, I_QUANTITY);
int newAmount = 0;
int oldAmount = 0;
try {
newAmount = Integer.parseInt(inputFieldString);
} catch (NumberFormatException e) {
// Not a integer value - do not save value
valuesOK = false;
}
try {
oldAmount = Integer.parseInt(currentAmount);
} catch (NumberFormatException e) {
// Not a integer value - probably an empty field
oldAmount = 0;
}
if (oldAmount != newAmount && valuesOK == true) {
System.out.println("Save new value");
dataHandler.modifyEntry(synckey, inputFieldString, I_QUANTITY);
}
}
}
}
nextJSP = INITIAL_JSP;
if (valuesOK == false)
nextJSP = SAVEFAIL_JSP;
return nextJSP;
}
/**
* Method addEntry. - Adds an Entry according to user input
* @return String - next JSP to call
*/
private void addEntry(HttpServletRequest request) {
// We take the content of the inputfield in the JSP named according to the tableheadername
// As next JSP we set the INITIAL_JSP again.
String[] newValues = new String[dataHandler.getColumns()];
for (int i = 0; i < dataHandler.getColumns(); i++) {
if (dataHandler.getTableHeaderName(i) != null) {
newValues[i] = (String) request.getParameter(dataHandler.getTableHeaderName(i));
}
// Quantity default value is 0
if (i == I_QUANTITY) {
newValues[i] = "0";
}
}
dataHandler.addEntry(newValues);
return;
}
/**
* Method setFilter - according to user input a filter string will be set up.
* @param request
* @return String - next JSP to call
*/
private String setFilter(HttpServletRequest request) {
filter_string = (String) request.getParameter("PRODUCTID");
if (filter_string.length() == 0) {
setFilterOff();
} else {
// The product id can be filtered. When the filter is activated, only products with a product ID that starts
// with the specified filter are displayed.
setFilterOn(I_PRODUCTID, filter_string);
// we also set the current page to one - so that we see the entries
setCurrenPage(1);
}
return INITIAL_JSP;
}
private void getBeansFromContext(HttpServletRequest request, boolean refreshSyncBoCount) {
// Get table defintion bean from session context. There is a bean, when this servlet has already been called once.
tableViewDefinition = (TableViewDefinition) request.getSession().getAttribute("tableViewDefinition");
// No bean in session context - create a new instance.
if (tableViewDefinition == null)
tableViewDefinition = new TableViewDefinition();
// we create a new dataHandler instance to read all data according to the actual settings
dataHandler = BasicDataHandler.instance(refreshSyncBoCount, start_index, MAX_TABLE_ROWS, sort_index, sort_ascending, filter_string);
}
public void loadBean() {
// Set headerpanel
// The left side displays the MI icon, that canbe clicked to go back to the MI home page
tableViewDefinition.setHeaderPanelEntryLeft("<a href=\"http://127.0.0.1:4444/me\" > <img src=\"mimes/milogo.gif\" alt=\"MI Home\" ></a>");
// The right side displays the text MDK
tableViewDefinition.setHeaderPanelEntryRight("MDK");
// Setup Commands for this example. Commands are displayed on the top of the centerpage.
// In this example we use add, delete, filter and list all commands.
setCommands();
// Set footerpanel
// The left side displays the application name
tableViewDefinition.setFooterPanelEntryLeft(current_filter_string);
// The right side displays the type of the example
tableViewDefinition.setFooterPanelEntryRight(currentPageFooter);
// set commands for application - the commands have been set in the initialize method already
tableViewDefinition.setCommandLine(commandLine);
// set title of the center window
tableViewDefinition.setCenterPageTitle(pageTitle);
// Generate table header
setTableHeader();
// Generate data and set Vector in bean
dataHandler.getDataArray();
// The following variables are necessary for the navigation
dataHandler.setTableRows(MAX_TABLE_ROWS);
dataHandler.setTableColumns(dataHandler.getColumns());
dataHandler.setRowsInDataset(dataHandler.getRowsInDataset());
dataHandler.setCurrentIndex(start_index);
}
private void putBeansIntoContext(HttpServletRequest request) {
// Put table definition bean in session context
if (tableViewDefinition == null) {
request.getSession().removeAttribute("tableViewDefintion");
} else {
request.getSession().setAttribute("tableViewDefinition", tableViewDefinition);
}
// Put data defintion in session context
if (dataHandler == null) {
request.getSession().removeAttribute("dataHandler");
} else {
request.getSession().setAttribute("dataHandler", dataHandler);
}
}
/**
* Method setFilterOff - All Data without Filter are displayed.
*/
private void setFilterOff() {
sort_index = I_PRODUCTID;
// Set sorting variables.
sort_ascending = true;
buttontextQuery = BUTTON_QUERY_TEXT;
current_filter_string = "No Filter";
filter_string = "";
}
private void setFilterOn(int index, String filter_string) {
buttontextQuery = BUTTON_QUERY_RESET_TEXT;
current_filter_string = "Filter: " + filter_string;
sort_index = index;
}
private void setCommands() {
// The command line contain add, delete, set filter and list all
// Add command
// commandLine.clear();
commandLine.removeAllElements();
// commandLine.add("<input type=\"submit\" value=\"Add\" class=\"image\" name=\"_event_" + EVENT_ADDENTRY + "\">");
commandLine.addElement("<input type=\"submit\" value=\"Add\" class=\"image\" name=\"_event_" + EVENT_ADDENTRY + "\">");
// Set Filter command
// commandLine.add("<input type=\"submit\" value=\"" + buttontextQuery + "\" class=\"image\" name=\"_event_" + EVENT_QUERY + "\">");
commandLine.addElement("<input type=\"submit\" value=\"" + buttontextQuery + "\" class=\"image\" name=\"_event_" + EVENT_QUERY + "\">");
// Delete command
// commandLine.add("<input type=\"submit\" value=\"Save\" class=\"image\" name=\"_event_" + EVENT_SAVE + "\">");
commandLine.addElement("<input type=\"submit\" value=\"Save\" class=\"image\" name=\"_event_" + EVENT_SAVE + "\">");
}
// Load array in Bean with Information about the Mobile Engine, i is the index for the entries
private void setTableHeader() {
int headercol = dataHandler.getColumns();
dataHandler.initTableHeader(headercol);
for (int i = 0; i < headercol; i++) {
// dataHandler.setTableHeaderEntry(i, dataHandler.getTableHeaderName(i));
dataHandler.setTableHeaderEntry(dataHandler.getTableHeaderName(i), i);
}
}
}