Java tutorial
/** * StaffInformer - Inform players about online staff * * Copyright (C) 2013-2014 matzefratze123 * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * */ package de.matzefratze123.staffinformer.util; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.HashMap; import java.util.Map; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import org.apache.commons.lang.Validate; import org.bukkit.ChatColor; import org.w3c.dom.Document; import org.w3c.dom.NamedNodeMap; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import de.matzefratze123.staffinformer.StaffInformer; public class I18N { private static final String ARGUMENT_TARGET = "%a"; private static final String MESSAGES_FILE = "messages.xml"; private static final String MESSAGES_TAG = "messages"; private static final String MESSAGE_ENTRY = "message"; private static final String ENTRY_ENTRY = "entry"; private static final String ENTRY_NAME = "name"; private static final String ID_ATTRIBUTE = "id"; private static boolean loaded = false; private static Map<String, String> messages; static { if (messages == null) { messages = new HashMap<String, String>(); } File dataFolder = StaffInformer.getInstance().getDataFolder(); dataFolder.mkdir(); File destFile = new File(dataFolder, MESSAGES_FILE); if (!destFile.exists()) { copyLanguageXml(destFile); } if (!loaded) { loaded = true; loadMessages(); } } public static String getMessage(String path, String... args) { String message = messages.get(path); if (message == null) { return null; } for (String arg : args) { message = replaceFirst(message, ARGUMENT_TARGET, arg); } message = ChatColor.translateAlternateColorCodes(StaffInformer.CHAR_COLOR_CHAR, message); return message; } public static void loadMessages() { messages.clear(); InputStream inStream = null; try { File file = new File(StaffInformer.getInstance().getDataFolder(), MESSAGES_FILE); if (file.exists()) { inStream = new FileInputStream(file); } else { inStream = I18N.class.getResourceAsStream('/' + MESSAGES_FILE); } if (inStream == null) { throw new IOException("null"); } DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document xml = builder.parse(inStream); NodeList nodes = xml.getChildNodes(); for (int i = 0; i < nodes.getLength(); i++) { Node node = nodes.item(i); if (node.getNodeName().equalsIgnoreCase(MESSAGES_TAG)) { //Messages entry! readEntry(node, ""); } } } catch (Exception e) { Logger.severe("Failed to load language messages: " + e.getMessage() + ". EXPECT ERRORS!"); e.printStackTrace(); } finally { try { if (inStream != null) { inStream.close(); } } catch (Exception e) { } } } private static void readEntry(Node node, String parentEntry) { NodeList list = node.getChildNodes(); for (int i = 0; i < list.getLength(); i++) { Node childNode = list.item(i); String nodeName = childNode.getNodeName(); if (nodeName.equalsIgnoreCase(MESSAGE_ENTRY)) { NamedNodeMap attributes = childNode.getAttributes(); Node idNode = attributes.getNamedItem(ID_ATTRIBUTE); if (idNode == null) { Logger.warning("Warning: No id for message in " + MESSAGES_FILE + ". Ignoring message..."); continue; } String id = idNode.getNodeValue(); String value = childNode.getTextContent(); messages.put(parentEntry + id, value); } else if (nodeName.equalsIgnoreCase(ENTRY_ENTRY)) { NamedNodeMap attributes = childNode.getAttributes(); Node nameNode = attributes.getNamedItem(ENTRY_NAME); String entryName = nameNode.getNodeValue(); readEntry(childNode, parentEntry + entryName + "."); } } } private static void copyLanguageXml(File destFile) { InputStream inStream = null; OutputStream outStream = null; try { destFile.createNewFile(); inStream = I18N.class.getResourceAsStream('/' + MESSAGES_FILE); outStream = new FileOutputStream(destFile); final byte[] BUFFER = new byte[1024]; int read; while ((read = inStream.read(BUFFER)) > 0) { outStream.write(BUFFER, 0, read); } } catch (IOException e) { Logger.severe("Failed to copy messages file! Using default messages..."); e.printStackTrace(); } finally { try { if (inStream != null) { inStream.close(); } if (outStream != null) { outStream.flush(); outStream.close(); } } catch (Exception e) { } } } /** * Replaces the first given target in the given string with the given replacement.</br> * This version of replaceFirst ignores regexes which is important for replacing arguments. */ private static String replaceFirst(String string, String target, String replacement) { Validate.notNull(string); Validate.notNull(target); Validate.notNull(replacement); if (target.isEmpty()) { return string; } char[] chars = string.toCharArray(); char[] targetChars = target.toCharArray(); int index = 0; int start = -1; for (int i = 0; i < chars.length; i++) { if (chars[i] == targetChars[index]) { if (index == 0) { start = i; } index++; if (index >= targetChars.length) { String firstPart = string.substring(0, start); String secondPart = string.substring(i + 1, chars.length); return firstPart + replacement + secondPart; } } else { index = 0; } } return string; } }