Statemachine for installation wizard (WIP)

14 files changed, 470 insertions, 40 deletions

diff --git a/EssentialsUpdate/nbproject/pmd.settings b/EssentialsUpdate/nbproject/pmd.settings
new file mode 100644
index 000000000..6a34e356c
--- /dev/null
+++ b/EssentialsUpdate/nbproject/pmd.settings
@@ -0,0 +1 @@
+DoNotUseThreads
diff --git a/EssentialsUpdate/src/com/earth2me/essentials/update/GetFile.java b/EssentialsUpdate/src/com/earth2me/essentials/update/GetFile.java
index 888950f34..8727d2f3b 100644
--- a/EssentialsUpdate/src/com/earth2me/essentials/update/GetFile.java
+++ b/EssentialsUpdate/src/com/earth2me/essentials/update/GetFile.java
@@ -22,7 +22,11 @@ public class GetFile
 
 	public GetFile(final String urlString) throws MalformedURLException, IOException
 	{
-		final URL url = new URL(urlString);
+		this(new URL(urlString));
+	}
+
+	public GetFile(final URL url) throws IOException
+	{
 		this.connection = url.openConnection();
 		this.connection.setConnectTimeout(1000);
 		this.connection.setReadTimeout(5000);
diff --git a/EssentialsUpdate/src/com/earth2me/essentials/update/UpdateProcess.java b/EssentialsUpdate/src/com/earth2me/essentials/update/UpdateProcess.java
index 95898bcb6..80434480f 100644
--- a/EssentialsUpdate/src/com/earth2me/essentials/update/UpdateProcess.java
+++ b/EssentialsUpdate/src/com/earth2me/essentials/update/UpdateProcess.java
@@ -1,5 +1,6 @@
 package com.earth2me.essentials.update;
 
+import com.earth2me.essentials.update.states.StateMachine;
 import java.util.List;
 import org.bukkit.Bukkit;
 import org.bukkit.command.CommandSender;
@@ -18,31 +19,41 @@ public class UpdateProcess extends PlayerListener
 	private transient Player currentPlayer;
 	private final transient Plugin plugin;
 	private final transient UpdateCheck updateCheck;
-	
+	private transient StateMachine stateMachine;
+
 	public UpdateProcess(final Plugin plugin, final UpdateCheck updateCheck)
 	{
 		this.plugin = plugin;
 		this.updateCheck = updateCheck;
 	}
-	
+
 	public void registerEvents()
 	{
 		final PluginManager pluginManager = plugin.getServer().getPluginManager();
 		pluginManager.registerEvent(Type.PLAYER_QUIT, this, Priority.Low, plugin);
 		pluginManager.registerEvent(Type.PLAYER_CHAT, this, Priority.Lowest, plugin);
 	}
-	
+
 	@Override
 	public void onPlayerChat(final PlayerChatEvent event)
 	{
 		if (event.getPlayer() == currentPlayer)
 		{
-			reactOnMessage(event.getMessage());
+			final StateMachine.MachineResult result = stateMachine.reactOnMessage(event.getMessage());
+			if (result == StateMachine.MachineResult.ABORT)
+			{
+				currentPlayer.sendMessage("Installation wizard aborted. You can restart it using /essentialsupdate.");
+				currentPlayer = null;
+			}
+			if (result == StateMachine.MachineResult.DONE)
+			{
+				startWork();
+			}
 			event.setCancelled(true);
 			return;
 		}
 	}
-	
+
 	@Override
 	public void onPlayerJoin(final PlayerJoinEvent event)
 	{
@@ -70,26 +81,26 @@ public class UpdateProcess extends PlayerListener
 			}
 		}
 	}
-	
-	void doAutomaticUpdate()
+
+	public void doAutomaticUpdate()
 	{
-		final UpdatesDownloader downloader = new UpdatesDownloader();
+
 		final VersionInfo info = updateCheck.getNewVersionInfo();
 		final List<String> changelog = info.getChangelog();
 		Bukkit.getLogger().info("Essentials changelog " + updateCheck.getNewVersion().toString());
 		for (String line : changelog)
 		{
-			Bukkit.getLogger().info(" - "+line);
+			Bukkit.getLogger().info(" - " + line);
 		}
-		downloader.start(plugin.getServer().getUpdateFolderFile(), info);
+		final UpdatesDownloader downloader = new UpdatesDownloader(plugin, info);
+		downloader.start();
 	}
-	
-	void doManualUpdate()
+
+	public void doManualUpdate()
 	{
-		
 	}
-	
-	void onCommand(CommandSender sender)
+
+	public void onCommand(final CommandSender sender)
 	{
 		if (sender instanceof Player && sender.hasPermission("essentials.install"))
 		{
@@ -107,7 +118,12 @@ public class UpdateProcess extends PlayerListener
 					sender.sendMessage("Your answers will be saved for a later update.");
 					sender.sendMessage("Please answer the messages with yes or no, if not otherwise stated.");
 					sender.sendMessage("Write bye/exit/quit if you want to exit the wizard at anytime.");
-					
+					stateMachine = new StateMachine(plugin, currentPlayer, updateCheck.getNewVersionInfo());
+					final StateMachine.MachineResult result = stateMachine.askQuestion();
+					if (result == StateMachine.MachineResult.DONE)
+					{
+						startWork();
+					}
 				}
 			}
 			if (!currentPlayer.equals(sender))
@@ -120,9 +136,17 @@ public class UpdateProcess extends PlayerListener
 			sender.sendMessage("Please run the command as op from in game.");
 		}
 	}
-	
-	private void reactOnMessage(String message)
+
+	private void startWork()
 	{
-		throw new UnsupportedOperationException("Not yet implemented");
+		currentPlayer.sendMessage("Installation wizard done. Starting installation.");
+		Bukkit.getScheduler().scheduleSyncDelayedTask(plugin, new Runnable()
+		{
+			@Override
+			public void run()
+			{
+				stateMachine.startWork();
+			}
+		});
 	}
 }
diff --git a/EssentialsUpdate/src/com/earth2me/essentials/update/UpdatesDownloader.java b/EssentialsUpdate/src/com/earth2me/essentials/update/UpdatesDownloader.java
index 28ffdfe3c..717163726 100644
--- a/EssentialsUpdate/src/com/earth2me/essentials/update/UpdatesDownloader.java
+++ b/EssentialsUpdate/src/com/earth2me/essentials/update/UpdatesDownloader.java
@@ -1,19 +1,28 @@
 package com.earth2me.essentials.update;
 
-import java.io.File;
+import org.bukkit.plugin.Plugin;
 
 
-public class UpdatesDownloader
+public class UpdatesDownloader extends WorkListener
 {
+	public UpdatesDownloader(final Plugin plugin, final VersionInfo newVersionInfo)
+	{
+		super(plugin, newVersionInfo);
+	}
+
+	public void start()
+	{
+	}
 
-	UpdatesDownloader()
+	@Override
+	public void onWorkAbort(String message)
 	{
-		
+		throw new UnsupportedOperationException("Not supported yet.");
 	}
 
-	void start(File updateFolderFile, VersionInfo newVersion)
+	@Override
+	public void onWorkDone(String message)
 	{
-		
+		throw new UnsupportedOperationException("Not supported yet.");
 	}
-	
 }
diff --git a/EssentialsUpdate/src/com/earth2me/essentials/update/VersionInfo.java b/EssentialsUpdate/src/com/earth2me/essentials/update/VersionInfo.java
index 9cd1e5edb..c34e40ae5 100644
--- a/EssentialsUpdate/src/com/earth2me/essentials/update/VersionInfo.java
+++ b/EssentialsUpdate/src/com/earth2me/essentials/update/VersionInfo.java
@@ -1,9 +1,10 @@
 package com.earth2me.essentials.update;
 
-import java.util.ArrayList;
 import org.bukkit.configuration.Configuration;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 
 public class VersionInfo
@@ -11,18 +12,18 @@ public class VersionInfo
 	private final transient List<String> changelog;
 	private final transient int minBukkit;
 	private final transient int maxBukkit;
-	private final transient List<ModuleInfo> modules;
+	private final transient Map<String, ModuleInfo> modules;
 
 	public VersionInfo(final Configuration updateConfig, final String path)
 	{
 		changelog = updateConfig.getList(path + ".changelog", Collections.<String>emptyList());
 		minBukkit = updateConfig.getInt(path + ".min-bukkit", 0);
 		maxBukkit = updateConfig.getInt(path + ".max-bukkit", 0);
-		modules = new ArrayList<ModuleInfo>();
+		modules = new HashMap<String, ModuleInfo>();
 		final String modulesPath = path + ".modules";
 		for (String module : updateConfig.getKeys(false))
 		{
-			modules.add(new ModuleInfo(updateConfig, modulesPath + module));
+			modules.put(module, new ModuleInfo(updateConfig, modulesPath + module));
 		}
 	}
 
@@ -41,8 +42,8 @@ public class VersionInfo
 		return maxBukkit;
 	}
 
-	public List<ModuleInfo> getModules()
+	public Map<String, ModuleInfo> getModules()
 	{
-		return Collections.unmodifiableList(modules);
+		return Collections.unmodifiableMap(modules);
 	}
 }
diff --git a/EssentialsUpdate/src/com/earth2me/essentials/update/WorkListener.java b/EssentialsUpdate/src/com/earth2me/essentials/update/WorkListener.java
new file mode 100644
index 000000000..da6bdb978
--- /dev/null
+++ b/EssentialsUpdate/src/com/earth2me/essentials/update/WorkListener.java
@@ -0,0 +1,38 @@
+package com.earth2me.essentials.update;
+
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
+
+
+public abstract class WorkListener
+{
+	public WorkListener(final Plugin plugin, final VersionInfo newVersionInfo)
+	{
+		this.plugin = plugin;
+		this.newVersionInfo = newVersionInfo;
+	}
+	private final transient Plugin plugin;
+	private final transient VersionInfo newVersionInfo;
+
+	public final void onWorkAbort() {
+		onWorkAbort(null);
+	}
+	
+	public abstract void onWorkAbort(String message);
+	
+	public final void onWorkDone() {
+		onWorkDone(null);
+	}
+
+	public abstract void onWorkDone(String message);
+
+	public VersionInfo getNewVersionInfo()
+	{
+		return newVersionInfo;
+	}
+
+	public Plugin getPlugin()
+	{
+		return plugin;
+	}
+}
diff --git a/EssentialsUpdate/src/com/earth2me/essentials/update/states/AbstractState.java b/EssentialsUpdate/src/com/earth2me/essentials/update/states/AbstractState.java
new file mode 100644
index 000000000..b217ebd4b
--- /dev/null
+++ b/EssentialsUpdate/src/com/earth2me/essentials/update/states/AbstractState.java
@@ -0,0 +1,67 @@
+package com.earth2me.essentials.update.states;
+
+import com.earth2me.essentials.update.WorkListener;
+import org.bukkit.entity.Player;
+
+
+public abstract class AbstractState
+{
+	private transient boolean abortion = false;
+
+	public abstract AbstractState getNextState();
+
+	/**
+	 * Check if we already know the answer, so the user does not have to answer the question.
+	 * 
+	 * @return true, if the answer could be guessed.
+	 */
+	public boolean guessAnswer()
+	{
+		return false;
+	}
+
+	/**
+	 * Ask the user the question.
+	 * @param sender 
+	 */
+	public abstract void askQuestion(Player sender);
+
+	/**
+	 * React on the answer and set internal variables
+	 * @param answer
+	 * @return true, if the answer could be recognized as a valid answer
+	 */
+	public abstract boolean reactOnAnswer(String answer);
+
+	public final AbstractState reactOnAnswer(final Player sender, final String answer)
+	{
+		final String trimmedAnswer = answer.trim();
+		if (trimmedAnswer.equalsIgnoreCase("quit")
+			|| trimmedAnswer.equalsIgnoreCase("bye")
+			|| trimmedAnswer.equalsIgnoreCase("abort"))
+		{
+			abortion = true;
+			return null;
+		}
+		final boolean found = reactOnAnswer(trimmedAnswer);
+		if (found)
+		{
+			return getNextState();
+		}
+		else
+		{
+			sender.sendMessage("Answer not recognized.");
+			return this;
+		}
+	}
+
+	/**
+	 * Do something based on the answer, that the user gave.
+	 */
+	public abstract void doWork(WorkListener workListener);
+
+	public boolean isAbortion()
+	{
+		return abortion;
+	}
+}
diff --git a/EssentialsUpdate/src/com/earth2me/essentials/update/states/AbstractYesNoState.java b/EssentialsUpdate/src/com/earth2me/essentials/update/states/AbstractYesNoState.java
new file mode 100644
index 000000000..67701c8db
--- /dev/null
+++ b/EssentialsUpdate/src/com/earth2me/essentials/update/states/AbstractYesNoState.java
@@ -0,0 +1,49 @@
+package com.earth2me.essentials.update.states;
+
+
+public abstract class AbstractYesNoState extends AbstractState
+{
+	private boolean answer = false;
+	private final transient AbstractState yesState;
+	private final transient AbstractState noState;
+
+	public AbstractYesNoState(final AbstractState yesState, final AbstractState noState)
+	{
+		this.yesState = yesState;
+		this.noState = noState;
+	}
+
+	@Override
+	public AbstractState getNextState()
+	{
+		return answer ? yesState : noState;
+	}
+
+	@Override
+	public boolean reactOnAnswer(final String answer)
+	{
+		if (answer.equalsIgnoreCase("yes")
+			|| answer.equalsIgnoreCase("y"))
+		{
+			this.answer = true;
+			return true;
+		}
+		if (answer.equalsIgnoreCase("no")
+			|| answer.equalsIgnoreCase("n"))
+		{
+			this.answer = false;
+			return true;
+		}
+		return false;
+	}
+
+	public boolean getAnswer()
+	{
+		return answer;
+	}
+
+	protected void setAnswer(final boolean answer)
+	{
+		this.answer = answer;
+	}
+}
diff --git a/EssentialsUpdate/src/com/earth2me/essentials/update/states/EssentialsChat.java b/EssentialsUpdate/src/com/earth2me/essentials/update/states/EssentialsChat.java
new file mode 100644
index 000000000..6669161d4
--- /dev/null
+++ b/EssentialsUpdate/src/com/earth2me/essentials/update/states/EssentialsChat.java
@@ -0,0 +1,46 @@
+package com.earth2me.essentials.update.states;
+
+import com.earth2me.essentials.update.WorkListener;
+import com.earth2me.essentials.update.tasks.InstallChat;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
+
+
+public class EssentialsChat extends AbstractYesNoState
+{
+	public EssentialsChat(final AbstractState next)
+	{
+		super(next, next);
+	}
+
+	@Override
+	public boolean guessAnswer()
+	{
+		final Plugin plugin = Bukkit.getPluginManager().getPlugin("EssentialsChat");
+		if (plugin != null)
+		{
+			setAnswer(true);
+			return true;
+		}
+		return false;
+	}
+
+	@Override
+	public void askQuestion(final Player sender)
+	{
+		sender.sendMessage("Do you want to install EssentialsChat? (yes/no)");
+		sender.sendMessage("Short descriptive text about what EssentialsChat does.");
+	}
+
+	@Override
+	public void doWork(final WorkListener listener)
+	{
+		if (getAnswer())
+		{
+			new InstallChat(listener).start();
+			return;
+		}
+		listener.onWorkDone();
+	}
+}
diff --git a/EssentialsUpdate/src/com/earth2me/essentials/update/states/Modules.java b/EssentialsUpdate/src/com/earth2me/essentials/update/states/Modules.java
deleted file mode 100644
index 56d2445c9..000000000
--- a/EssentialsUpdate/src/com/earth2me/essentials/update/states/Modules.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package com.earth2me.essentials.update.states;
-
-
-public class Modules
-{
-	
-}
diff --git a/EssentialsUpdate/src/com/earth2me/essentials/update/states/StateMachine.java b/EssentialsUpdate/src/com/earth2me/essentials/update/states/StateMachine.java
new file mode 100644
index 000000000..b69ee14a9
--- /dev/null
+++ b/EssentialsUpdate/src/com/earth2me/essentials/update/states/StateMachine.java
@@ -0,0 +1,118 @@
+package com.earth2me.essentials.update.states;
+
+import com.earth2me.essentials.update.WorkListener;
+import com.earth2me.essentials.update.VersionInfo;
+import java.util.ArrayList;
+import java.util.List;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
+
+
+public class StateMachine extends WorkListener
+{
+	public enum MachineResult
+	{
+		ABORT, WAIT, DONE
+	}
+	private final transient List<AbstractState> states = new ArrayList<AbstractState>();
+	private transient AbstractState current;
+	private final transient Player player;
+
+	public StateMachine(final Plugin plugin, final Player player, final VersionInfo newVersionInfo)
+	{
+		super(plugin, newVersionInfo);
+		this.player = player;
+		states.clear();
+		final AbstractState state = new EssentialsChat(null);
+		states.add(state);
+		current = state;
+	}
+
+	public MachineResult askQuestion()
+	{
+		while (current.guessAnswer())
+		{
+			current = current.getNextState();
+			if (current == null)
+			{
+				return MachineResult.DONE;
+			}
+		}
+		current.askQuestion(player);
+		return MachineResult.WAIT;
+	}
+
+	public MachineResult reactOnMessage(final String message)
+	{
+		final AbstractState next = current.reactOnAnswer(player, message);
+		if (next == null)
+		{
+			if (current.isAbortion())
+			{
+				return MachineResult.ABORT;
+			}
+			else
+			{
+				return MachineResult.DONE;
+			}
+		}
+		current = next;
+		return askQuestion();
+	}
+	private int position = 0;
+
+	public void startWork()
+	{
+		callStateWork();
+	}
+
+	private void callStateWork()
+	{
+		if (position > states.size())
+		{
+			if (player.isOnline())
+			{
+				player.sendMessage("Installation done.");
+			}
+			return;
+		}
+		final AbstractState state = states.get(position);
+		state.doWork(this);
+	}
+
+	@Override
+	public void onWorkAbort(final String message)
+	{
+		position = 0;
+		Bukkit.getScheduler().scheduleSyncDelayedTask(getPlugin(), new Runnable()
+		{
+			@Override
+			public void run()
+			{
+				if (message != null && !message.isEmpty() && StateMachine.this.player.isOnline())
+				{
+					StateMachine.this.player.sendMessage(message);
+				}
+			}
+		});
+	}
+
+	@Override
+	public void onWorkDone(final String message)
+	{
+		position++;
+		Bukkit.getScheduler().scheduleSyncDelayedTask(getPlugin(), new Runnable()
+		{
+			@Override
+			public void run()
+			{
+				if (message != null && !message.isEmpty() && StateMachine.this.player.isOnline())
+				{
+					StateMachine.this.player.sendMessage(message);
+				}
+				StateMachine.this.callStateWork();
+			}
+		});
+	}
+}
diff --git a/EssentialsUpdate/src/com/earth2me/essentials/update/tasks/InstallChat.java b/EssentialsUpdate/src/com/earth2me/essentials/update/tasks/InstallChat.java
new file mode 100644
index 000000000..44b4e245d
--- /dev/null
+++ b/EssentialsUpdate/src/com/earth2me/essentials/update/tasks/InstallChat.java
@@ -0,0 +1,12 @@
+package com.earth2me.essentials.update.tasks;
+
+import com.earth2me.essentials.update.WorkListener;
+
+
+public class InstallChat extends InstallModule
+{
+	public InstallChat(final WorkListener listener)
+	{
+		super(listener, "EssentialsChat");
+	}
+}
diff --git a/EssentialsUpdate/src/com/earth2me/essentials/update/tasks/InstallModule.java b/EssentialsUpdate/src/com/earth2me/essentials/update/tasks/InstallModule.java
new file mode 100644
index 000000000..b97991a04
--- /dev/null
+++ b/EssentialsUpdate/src/com/earth2me/essentials/update/tasks/InstallModule.java
@@ -0,0 +1,61 @@
+package com.earth2me.essentials.update.tasks;
+
+import com.earth2me.essentials.update.GetFile;
+import com.earth2me.essentials.update.ModuleInfo;
+import com.earth2me.essentials.update.VersionInfo;
+import com.earth2me.essentials.update.WorkListener;
+import java.io.File;
+import java.net.URL;
+import java.util.logging.Level;
+import org.bukkit.Bukkit;
+
+
+public class InstallModule implements Runnable, Task
+{
+	protected final transient WorkListener listener;
+	private final transient String moduleName;
+	private final transient String fileName;
+
+	public InstallModule(final WorkListener listener, final String moduleName)
+	{
+		this(listener, moduleName, moduleName + ".jar");
+	}
+
+	public InstallModule(final WorkListener listener, final String moduleName, final String fileName)
+	{
+		this.listener = listener;
+		this.moduleName = moduleName;
+		this.fileName = fileName;
+	}
+
+	@Override
+	public void start()
+	{
+		Bukkit.getScheduler().scheduleAsyncDelayedTask(listener.getPlugin(), this);
+	}
+
+	@Override
+	public void run()
+	{
+		final VersionInfo info = listener.getNewVersionInfo();
+		final ModuleInfo module = info.getModules().get(moduleName);
+		if (module == null)
+		{
+			listener.onWorkAbort("Module " + moduleName + " not found in VersionInfo.");
+			return;
+		}
+		try
+		{
+			final URL downloadUrl = module.getUrl();
+			final GetFile getFile = new GetFile(downloadUrl);
+			getFile.saveTo(new File(listener.getPlugin().getServer().getUpdateFolderFile(), fileName), module.getHash());
+			listener.onWorkDone("Module " + moduleName + " downloaded.");
+		}
+		catch (Exception ex)
+		{
+			Bukkit.getLogger().log(Level.SEVERE, "Failed to download module " + moduleName + " to " + fileName, ex);
+			listener.onWorkAbort("An error occured, please check your server log.");
+			return;
+		}
+	}
+}
diff --git a/EssentialsUpdate/src/com/earth2me/essentials/update/tasks/Task.java b/EssentialsUpdate/src/com/earth2me/essentials/update/tasks/Task.java
new file mode 100644
index 000000000..3f1d572ed
--- /dev/null
+++ b/EssentialsUpdate/src/com/earth2me/essentials/update/tasks/Task.java
@@ -0,0 +1,7 @@
+package com.earth2me.essentials.update.tasks;
+
+
+public interface Task
+{
+	void start();
+}