222 lines
6.2 KiB
Java
222 lines
6.2 KiB
Java
/*
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* Minecraft Forge
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* Copyright (c) 2016-2018.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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package net.minecraftforge.common;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.lang.reflect.Type;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Objects;
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import java.util.UUID;
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import javax.annotation.Nullable;
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import com.google.common.base.Charsets;
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import net.minecraftforge.fml.loading.FMLLoader;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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import com.google.common.collect.ImmutableMap;
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import com.google.common.reflect.TypeToken;
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import com.google.gson.Gson;
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import com.google.gson.GsonBuilder;
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import com.google.gson.JsonSyntaxException;
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import org.apache.logging.log4j.Marker;
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import org.apache.logging.log4j.MarkerManager;
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/**
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* Caches player's last known usernames
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* <p>
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* Modders should use {@link #getLastKnownUsername(UUID)} to determine a players
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* last known username.<br>
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* For convenience, {@link #getMap()} is provided to get an immutable copy of
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* the caches underlying map.
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*/
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public final class UsernameCache {
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private static Map<UUID, String> map = new HashMap<>();
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private static final Path saveFile = FMLLoader.getGamePath().resolve("usernamecache.json");
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private static final Gson gson = new GsonBuilder().setPrettyPrinting().create();
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private static final Logger LOGGER = LogManager.getLogger(UsernameCache.class);
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private static final Marker USRCACHE = MarkerManager.getMarker("USERNAMECACHE");
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private UsernameCache() {}
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/**
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* Set a player's current usernamee
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*
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* @param uuid
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* the player's {@link java.util.UUID UUID}
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* @param username
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* the player's username
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*/
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protected static void setUsername(UUID uuid, String username)
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{
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Objects.requireNonNull(uuid);
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Objects.requireNonNull(username);
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if (username.equals(map.get(uuid))) return;
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map.put(uuid, username);
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save();
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}
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/**
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* Remove a player's username from the cache
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*
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* @param uuid
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* the player's {@link java.util.UUID UUID}
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* @return if the cache contained the user
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*/
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protected static boolean removeUsername(UUID uuid)
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{
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Objects.requireNonNull(uuid);
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if (map.remove(uuid) != null)
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{
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save();
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return true;
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}
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return false;
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}
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/**
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* Get the player's last known username
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* <p>
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* <b>May be <code>null</code></b>
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*
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* @param uuid
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* the player's {@link java.util.UUID UUID}
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* @return the player's last known username, or <code>null</code> if the
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* cache doesn't have a record of the last username
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*/
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@Nullable
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public static String getLastKnownUsername(UUID uuid)
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{
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Objects.requireNonNull(uuid);
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return map.get(uuid);
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}
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/**
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* Check if the cache contains the given player's username
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*
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* @param uuid
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* the player's {@link java.util.UUID UUID}
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* @return if the cache contains a username for the given player
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*/
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public static boolean containsUUID(UUID uuid)
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{
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Objects.requireNonNull(uuid);
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return map.containsKey(uuid);
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}
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/**
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* Get an immutable copy of the cache's underlying map
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*
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* @return the map
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*/
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public static Map<UUID, String> getMap()
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{
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return ImmutableMap.copyOf(map);
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}
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/**
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* Save the cache to file
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*/
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protected static void save()
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{
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new SaveThread(gson.toJson(map)).start();
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}
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/**
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* Load the cache from file
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*/
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protected static void load()
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{
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if (!Files.exists(saveFile)) return;
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try (final BufferedReader reader = Files.newBufferedReader(saveFile, Charsets.UTF_8))
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{
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@SuppressWarnings("serial")
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Type type = new TypeToken<Map<UUID, String>>(){}.getType();
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map = gson.fromJson(reader, type);
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}
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catch (JsonSyntaxException | IOException e)
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{
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LOGGER.error(USRCACHE,"Could not parse username cache file as valid json, deleting file {}", saveFile, e);
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try
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{
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Files.delete(saveFile);
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}
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catch (IOException e1)
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{
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LOGGER.error(USRCACHE,"Could not delete file {}", saveFile.toString());
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}
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}
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finally
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{
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// Can sometimes occur when the json file is malformed
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if (map == null)
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{
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map = new HashMap<>();
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}
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}
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}
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/**
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* Used for saving the {@link com.google.gson.Gson#toJson(Object) Gson}
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* representation of the cache to disk
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*/
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private static class SaveThread extends Thread {
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/** The data that will be saved to disk */
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private final String data;
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public SaveThread(String data)
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{
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this.data = data;
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}
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@Override
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public void run()
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{
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try
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{
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// Make sure we don't save when another thread is still saving
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synchronized (saveFile)
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{
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Files.write(saveFile, data.getBytes(StandardCharsets.UTF_8));
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}
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}
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catch (IOException e)
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{
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LOGGER.error(USRCACHE, "Failed to save username cache to file!", e);
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}
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}
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}
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}
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