EssentialsUpdate WIP

EssentialsUpdate/src/com/earth2me/essentials/update/UpdateCheck.java

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+package com.earth2me.essentials.update;
+
+import java.io.File;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import org.bukkit.Bukkit;
+import org.bukkit.plugin.Plugin;
+import org.bukkit.plugin.PluginManager;
+
+
+public class UpdateCheck
+{
+	private transient CheckResult result = CheckResult.UNKNOWN;
+	private transient Version currentVersion;
+	private transient Version newVersion = null;
+	private transient int bukkitResult = 0;
+	private transient UpdateFile updateFile;
+	private final static int CHECK_INTERVAL = 20 * 60 * 60 * 6;
+	private final transient Plugin plugin;
+	private transient boolean essentialsInstalled;
+
+	public UpdateCheck(Plugin plugin)
+	{
+		this.plugin = plugin;
+		updateFile = new UpdateFile(plugin);
+		checkForEssentials();
+	}
+
+	private void checkForEssentials()
+	{
+		PluginManager pm = plugin.getServer().getPluginManager();
+		Plugin essentials = pm.getPlugin("Essentials");
+		if (essentials == null)
+		{
+			essentialsInstalled = false;
+			if (new File(plugin.getDataFolder().getParentFile(), "Essentials.jar").exists())
+			{
+				Bukkit.getLogger().severe("Essentials.jar found, but not recognized by Bukkit. Broken download?");
+			}
+		}
+		else
+		{
+			essentialsInstalled = true;
+			currentVersion = new Version(essentials.getDescription().getVersion());
+		}
+	}
+
+	public void scheduleUpdateTask()
+	{
+		plugin.getServer().getScheduler().scheduleAsyncRepeatingTask(plugin, new Runnable()
+		{
+			@Override
+			public void run()
+			{
+				updateFile = new UpdateFile(plugin);
+				checkForUpdates();
+			}
+		}, CHECK_INTERVAL, CHECK_INTERVAL);
+	}
+
+	public boolean isEssentialsInstalled()
+	{
+		return essentialsInstalled;
+	}
+
+	public CheckResult getResult()
+	{
+		return result;
+	}
+
+	int getNewBukkitVersion()
+	{
+		return bukkitResult;
+	}
+
+	VersionInfo getNewVersionInfo()
+	{
+		return updateFile.getVersions().get(newVersion);
+	}
+
+	public enum CheckResult
+	{
+		NEW_ESS, NEW_ESS_BUKKIT, NEW_BUKKIT, OK, UNKNOWN
+	}
+
+	public void checkForUpdates()
+	{
+		if (currentVersion == null)
+		{
+			return;
+		}
+		final Map<Version, VersionInfo> versions = updateFile.getVersions();
+		final int bukkitVersion = getBukkitVersion();
+		Version higher = null;
+		Version found = null;
+		Version lower = null;
+		int bukkitHigher = 0;
+		int bukkitLower = 0;
+		for (Entry<Version, VersionInfo> entry : versions.entrySet())
+		{
+			final int minBukkit = entry.getValue().getMinBukkit();
+			final int maxBukkit = entry.getValue().getMaxBukkit();
+			if (minBukkit == 0 || maxBukkit == 0)
+			{
+				continue;
+			}
+			if (bukkitVersion <= maxBukkit)
+			{
+				if (bukkitVersion < minBukkit)
+				{
+					if (higher == null || higher.compareTo(entry.getKey()) < 0)
+					{
+
+						higher = entry.getKey();
+						bukkitHigher = minBukkit;
+					}
+				}
+				else
+				{
+					if (found == null || found.compareTo(entry.getKey()) < 0)
+					{
+						found = entry.getKey();
+					}
+				}
+			}
+			else
+			{
+				if (lower == null || lower.compareTo(entry.getKey()) < 0)
+				{
+					lower = entry.getKey();
+					bukkitLower = minBukkit;
+				}
+			}
+		}
+		if (found != null)
+		{
+			if (found.compareTo(currentVersion) > 0)
+			{
+				result = CheckResult.NEW_ESS;
+				newVersion = found;
+			}
+			else
+			{
+				result = CheckResult.OK;
+			}
+		}
+		else if (higher != null)
+		{
+			if (higher.compareTo(currentVersion) > 0)
+			{
+				newVersion = higher;
+				result = CheckResult.NEW_ESS_BUKKIT;
+				bukkitResult = bukkitHigher;
+			}
+			else if (higher.compareTo(currentVersion) < 0)
+			{
+				result = CheckResult.UNKNOWN;
+			}
+			else
+			{
+				result = CheckResult.NEW_BUKKIT;
+				bukkitResult = bukkitHigher;
+			}
+		}
+		else if (lower != null)
+		{
+			if (lower.compareTo(currentVersion) > 0)
+			{
+				result = CheckResult.NEW_ESS_BUKKIT;
+				newVersion = lower;
+				bukkitResult = bukkitLower;
+			}
+			else if (lower.compareTo(currentVersion) < 0)
+			{
+				result = CheckResult.UNKNOWN;
+			}
+			else
+			{
+				result = CheckResult.NEW_BUKKIT;
+				bukkitResult = bukkitLower;
+			}
+		}
+
+	}
+
+	private int getBukkitVersion()
+	{
+		final Matcher versionMatch = Pattern.compile("git-Bukkit-([0-9]+).([0-9]+).([0-9]+)-[0-9]+-[0-9a-z]+-b([0-9]+)jnks.*").matcher(plugin.getServer().getVersion());
+		if (versionMatch.matches())
+		{
+			return Integer.parseInt(versionMatch.group(4));
+		}
+		throw new NumberFormatException("Bukkit Version changed!");
+	}
+
+	public Version getNewVersion()
+	{
+		return newVersion;
+	}
+}