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The Microlog MIDP module contains the MIDP specific classes
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/*
* Copyright 2008 The Microlog project @sourceforge.net
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.sf.microlog.midp;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
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.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import net.sf.microlog.core.MicrologConstants;
import net.sf.microproperties.Properties;
import net.sf.microproperties.midp.MidletProperties;
/**
* A MIDlet that is used for viewing a log created with the RecordStoreAppender.
*
* @author Johan Karlsson ([email protected])
* @author Darius Katz
*/
public class RecordStoreLogViewer extends MIDlet implements CommandListener {
private static final int MAX_NAME_LENGTH = 32;
private final Display display;
private final Form logScreen;
private final Form preferenceScreen;
private final TextField nameField;
private final Command loadLogCommand = new LoadLogCommand();
private final Command clearLogCommand = new ClearLogCommand();
private final Command exitCommand = new ExitCommand();
private final Command preferenceCommand = new PreferenceCommand();
private final Command preferenceOkCommand = new PreferenceOkCommand();
private final Command preferenceCancelCommand = new PreferenceCancelCommand();
private final Command switchComparatorCommand = new SwitchComparatorCommand(
(AbstractCommand) loadLogCommand);
RecordStoreLogLoader loader;
/**
* Create a RecordStoreLogViewer.
*/
public RecordStoreLogViewer() {
super();
display = Display.getDisplay(this);
logScreen = new Form("Log content");
logScreen.addCommand(loadLogCommand);
logScreen.addCommand(clearLogCommand);
logScreen.addCommand(preferenceCommand);
logScreen.addCommand(exitCommand);
logScreen.addCommand(switchComparatorCommand);
logScreen.setCommandListener(this);
preferenceScreen = new Form("Preferences");
nameField = new TextField("RecordStore name ", null, MAX_NAME_LENGTH,
TextField.ANY);
preferenceScreen.append(nameField);
preferenceScreen.addCommand(preferenceOkCommand);
preferenceScreen.addCommand(preferenceCancelCommand);
preferenceScreen.addCommand(exitCommand);
preferenceScreen.setCommandListener(this);
}
/**
* Start the MIDlet.
*
* @throws MIDletStateChangeException
* if the MIDlet fails to change the state.
*/
protected void startApp() throws MIDletStateChangeException {
Properties properties = new MidletProperties(this, MicrologConstants.DEFAULT_PROPERTY_FILE);
loader = new RecordStoreLogLoader(properties);
display.setCurrent(logScreen);
}
/**
* Pause the MIDlet.
*/
protected void pauseApp() {
}
/**
* Destroy the MIDlet.
*
* @param unconditional
* If true when this method is called, the MIDlet must cleanup
* and release all resources. If false the MIDlet may throw
* MIDletStateChangeException to indicate it does
* not want to be destroyed at this time.
* @throws MIDletStateChangeException
* if the MIDlet fails to change the state.
*/
protected void destroyApp(boolean unconditional)
throws MIDletStateChangeException {
}
/**
* Implementation of the CommandListener interface.
*
* @param cmd
* the command.
* @param displayable
* the displayable that generated the command action.
*/
public void commandAction(Command cmd, Displayable displayable) {
if (cmd instanceof AbstractCommand) {
AbstractCommand myCmd = (AbstractCommand) cmd;
myCmd.execute();
}
}
/**
* The super class for all the Command objects.
*
* @author Johan Karlsson
*/
protected abstract class AbstractCommand extends Command {
/**
* Create an AbstractCommand.
*
* @param label
* the label to use.
* @param commandType
* the type of Command.
* @param priority
* the priority of the Command.
*/
public AbstractCommand(String label, int commandType, int priority) {
super(label, commandType, priority);
}
/**
* Create an AbstractCommand.
*
* @param shortLabel
* the short label to use.
* @param longLabel
* the long label to use.
* @param commandType
* the type of Command.
* @param priority
* the priority of the Command.
*/
public AbstractCommand(String shortLabel, String longLabel,
int commandType, int priority) {
super(shortLabel, longLabel, commandType, priority);
}
/**
* Execute the command.
*/
public abstract void execute();
}
/**
* A command that loads the log.
*
* @author Johan Karlsson
*/
protected class LoadLogCommand extends AbstractCommand {
/**
* Create a LoadLogCommand object.
*/
public LoadLogCommand() {
super("Load", "Load Log", Command.ITEM, 1);
}
/**
* Execute the command.
*
* @see net.sf.microlog.midp.RecordStoreLogViewer.AbstractCommand#execute()
*/
public void execute() {
logScreen.deleteAll();
String logContent = loader.getLogContent();
logScreen.append(logContent);
}
}
/**
* A command that clears the log.
*
* @author Johan Karlsson
*/
protected class ClearLogCommand extends AbstractCommand {
/**
* Create a ClearLogCommand.
*/
public ClearLogCommand() {
super("Clear", "Clear Log", Command.ITEM, 2);
}
/**
* Execute the command.
*
* @see net.sf.microlog.midp.RecordStoreLogViewer.AbstractCommand#execute()
*/
public void execute() {
logScreen.deleteAll();
loader.clearLog();
}
}
/**
* A command that moves us to the preference screen.
*
* @author Johan Karlsson
*/
protected class PreferenceCommand extends AbstractCommand {
/**
* Create an PreferenceCommand.
*/
public PreferenceCommand() {
super("Preferences", Command.ITEM, 3);
}
/**
* @see net.sf.microlog.midp.RecordStoreLogViewer.AbstractCommand#execute()
*/
public void execute() {
nameField.setString(loader.getRecordStoreName());
display.setCurrent(preferenceScreen);
}
}
/**
* A command that exit the MIDlet.
*
* @author Johan Karlsson
*/
protected class ExitCommand extends AbstractCommand {
/**
* Create an PreferenceCancelCommand.
*/
public ExitCommand() {
super("Exit", Command.EXIT, 1);
}
/**
* @see net.sf.microlog.midp.RecordStoreLogViewer.AbstractCommand#execute()
*/
public void execute() {
notifyDestroyed();
}
}
/**
* Accept the preferences.
*
* @author Johan Karlsson
*/
protected class PreferenceOkCommand extends AbstractCommand {
/**
* Create an PreferenceCancelCommand.
*/
public PreferenceOkCommand() {
super("OK", Command.OK, 1);
}
/**
* @see net.sf.microlog.midp.RecordStoreLogViewer.AbstractCommand#execute()
*/
public void execute() {
String newName = nameField.getString();
if (newName != null && newName.length() > 0) {
loader.setRecordStoreName(newName);
} else {
showInfoAlert("Please enter a name.", null);
}
}
}
/**
* Cancel the preferences.
*
* @author Johan Karlsson
*/
protected class PreferenceCancelCommand extends AbstractCommand {
/**
* Create an PreferenceCancelCommand.
*/
public PreferenceCancelCommand() {
super("Cancel", Command.CANCEL, 1);
}
/**
* @see net.sf.microlog.midp.RecordStoreLogViewer.AbstractCommand#execute()
*/
public void execute() {
display.setCurrent(logScreen);
}
}
/**
* Switch between RecordComparators. The
*
* @author Darius Katz
*/
protected class SwitchComparatorCommand extends AbstractCommand {
private final AbstractCommand performThisCommand;
/**
* Create a SwitchComparatorCommand.
*
* @param command
* The AbstractCommand to perform after switching
* RecordComparator. Ignored if null.
*/
public SwitchComparatorCommand(AbstractCommand command) {
super("Switch sort-order", Command.ITEM, 3);
performThisCommand = command;
}
/**
* @see net.sf.microlog.midp.RecordStoreLogViewer.AbstractCommand#execute()
*/
public void execute() {
loader.switchSortOrder();
if (performThisCommand != null) {
performThisCommand.execute();
}
}
}
/**
* Show an information alert.
*
* @param message
* the message to show.
* @param exception
* an optional exception to append to the message. Could be null.
*/
protected void showInfoAlert(String message, Throwable exception) {
StringBuffer buffer = new StringBuffer(message);
if (exception != null) {
buffer.append("\r\n");
buffer.append(exception);
}
Alert alert = new Alert("Info", buffer.toString(), null, AlertType.INFO);
display.setCurrent(alert, display.getCurrent());
}
}