eventloglistui.java

一个基于PlaceLab的室内和室外的智能导航系统

package org.placelab.midp;

import java.util.Date;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Spacer;
import javax.microedition.lcdui.StringItem;
import javax.microedition.rms.RecordEnumeration;
import javax.microedition.rms.RecordStoreException;
import org.placelab.util.StringUtil;

public class EventLogListUI implements UIComponent, CommandListener {
		Form browseForm = null;
		Display display = null;
		UIComponent back = null;
		RecordEnumeration re = null;
		int curRec = 0;
		int showAtMost = 5;
		Command next10Command = null;
		Command backCommand = null;
		//Command uploadCommand = null;
		Command clearCommand = null;
		
		public EventLogListUI(Display display, UIComponent back) {
			this.display=display;
			this.back=back;
		}
		
		public void setContent() throws RecordStoreException {
			if ((re == null) || (!re.hasNextElement())) {
				re = null;
				return;
			}
			int min = curRec;
			int max = min + showAtMost;
			if (max > EventLogger.numRecords()) {
				max = EventLogger.numRecords(); //recordCount;
			}
			browseForm.deleteAll();
			for (int i = min; i < max; i++) {
				if ((re != null) && re.hasNextElement()) {
					try {
						curRec++;
						String s = new String(re.nextRecord());
						String[] sarr = StringUtil.split(s, '|');
						int idx = Integer.parseInt(sarr[1]);
						String stat = null;
						try {
							long l = (new Date().getTime() - Long.parseLong(sarr[0]))/1000;
							long lo = l;
							long sec = l%60;
							l /= 60;
							long mn = l%60;
							l /= 60;
							stat = "-" + l + ":" + mn + ":" + sec;
						} catch (Exception ex) {;}//stat = ex.getClass().getName() + ex.getMessage();}	
						if ((idx < 0) || (idx >= EventLogger.getNumEventTypes() || 
								EventLogger.getEventType(new Integer(idx)) == null)) {
						
							stat = stat + "  Unknown";
						} else {
							stat = stat + "  " + EventLogger.getEventType(new Integer(idx));//[idx];
						}
						String msg = sarr[2];
						browseForm.append(new StringItem(stat, msg + "\n"));
						browseForm.append(new Spacer(0, 4));
					} catch (Exception ex) {
						;
					}
				} else {
				    browseForm.append(new StringItem("","End of records"));
				}
			}
			if(max == 0)  {
			    browseForm.append(new StringItem("","No records"));
			}
	
			setTitle(min, max);
			if ((re == null) || (!re.hasNextElement())) {
				re = null;
				browseForm.removeCommand(next10Command);
			}
		}
		public void setTitle(int min, int max) {
			String numrecs = "unknown";
			numrecs = ""+ EventLogger.numRecords();
			browseForm.setTitle("Event Log (" + (min + 1) + "-" + max + " of "
					+ numrecs + ")");
		}
		public void commandAction(Command c, Displayable s) {
			if (c.getLabel().startsWith("Next")) {
				try {
					setContent();
				} catch (RecordStoreException e) {
					e.printStackTrace();
				}
			}
			if (c.getLabel().startsWith("Back")) {
				back.showUI(this);//display.setCurrent(back);
			}

		}
		
		public void showUI(UIComponent from) {
			if (browseForm == null) {
				browseForm = new Form("Event Log");
				next10Command = new Command("Next " + showAtMost, Command.SCREEN, 1);
				backCommand = new Command("Back", Command.BACK, 1);
				//uploadCommand = new Command("Upload", Command.ITEM, 1);
				clearCommand = new Command("Clear", Command.ITEM,1);
				//browseForm.addCommand(uploadCommand);
			} else {
				browseForm.deleteAll();
				browseForm.removeCommand(next10Command);
				browseForm.removeCommand(backCommand);
			}
			curRec = 0;
			if (EventLogger.numRecords() > showAtMost) {
				browseForm.addCommand(next10Command);
			}
			if (back != null) {
				browseForm.addCommand(backCommand);
			}
			browseForm.setCommandListener(this);
			display.setCurrent(browseForm);
			try {
				re = EventLogger.getRecords(null, null, false);
				if(!re.hasNextElement()) {
				    browseForm.append(new StringItem("","No records"));
				    browseForm.setTitle("Event Log");
				} else {
				    setContent();
				}
			} catch(RecordStoreException rse) {
				browseForm.append(new StringItem("Error", ""+rse));
			}
		}
	}