Java tutorial
/* * Simple Java Dict Client (RFC2229) * * $Id$ * * Copyright Metaparadigm Pte. Ltd. 2004. * Michael Clark <michael@metaparadigm.com> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public (LGPL) * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details: http://www.gnu.org/ * */ package com.metaparadigm.dict; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.io.Serializable; import java.net.Socket; import java.util.ArrayList; import org.apache.commons.lang.CharEncoding; public class DictClient implements Serializable { private final static long serialVersionUID = 1; private final static boolean debug = false; private static String DEFAULT_HOST = "localhost"; private static int DEFAULT_PORT = 2628; private String host; private int port; private transient ArrayList<Strategy> strategies; private transient ArrayList<Database> databases; private transient String ident; private transient Socket sock; private transient PrintWriter out; private transient BufferedReader in; public DictClient() { host = DEFAULT_HOST; port = DEFAULT_PORT; } public DictClient(String host) { this.host = host; port = DEFAULT_PORT; } public DictClient(String host, int port) { this.host = host; this.port = port; } public void setHost(String host) { if (sock != null && !this.host.equals(host)) close(); this.host = host; } public void setPort(int port) { if (sock != null && this.port != port) close(); this.port = port; } private synchronized void connect() throws IOException, DictClientException { System.out.println("DictClient.connect: opening connection to " + host + ":" + port); sock = new Socket(host, port); in = new BufferedReader(new InputStreamReader(sock.getInputStream(), CharEncoding.UTF_8)); out = new PrintWriter(new OutputStreamWriter(sock.getOutputStream(), CharEncoding.UTF_8)); DictCommandResult r = new DictCommandResult(in.readLine()); if (r.code != DictCommandResult.BANNER) { close(); throw new DictClientException(r); } ident = r.msg; System.out.println("DictClient.connect: connected to " + host + ":" + port + " ident=\"" + ident + "\""); } @Override public void finalize() { close(); } private synchronized String status() throws IOException, DictClientException { out.print("STATUS\n"); out.flush(); DictCommandResult r = new DictCommandResult(in.readLine()); if (r.code != DictCommandResult.STATUS) throw new DictClientException(r); if (debug) System.out.println("DictClient.status: " + r.msg); return r.msg; } public synchronized String checkConnection() throws IOException, DictClientException { if (sock == null) { connect(); return status(); } try { return status(); } catch (Exception e) { System.out.println("DictClient.status: Exception " + e); close(); connect(); return status(); } } public synchronized void close() { if (sock == null) return; try { out.print("QUIT\n"); out.flush(); String line = in.readLine(); if (line != null /* EOF */ ) { DictCommandResult r = new DictCommandResult(line); if (r.code != DictCommandResult.CLOSING_CONNECTION) { System.out.println("DictClient.close: Exception: " + r); } } } catch (IOException e) { System.out.println("DictClient.close: IOException while closing: " + e); } finally { try { sock.close(); } catch (IOException e) { } sock = null; in = null; out = null; System.out.println("DictClient.close: connection closed"); } } public synchronized ArrayList getDatabases() throws IOException, DictClientException { if (databases == null) fetchDatabases(); return databases; } private synchronized void fetchDatabases() throws IOException, DictClientException { checkConnection(); out.print("SHOW DATABASES\n"); out.flush(); DictCommandResult r = new DictCommandResult(in.readLine()); if (r.code != DictCommandResult.DATABASES_PRESENT) throw new DictClientException(r); databases = new ArrayList<Database>(); String line; while (true) { line = in.readLine(); if (line.equals(".")) break; String database = line.substring(0, line.indexOf(' ')); String description = line.substring(line.indexOf('"') + 1, line.lastIndexOf('"')); databases.add(new Database(database, description)); } r = new DictCommandResult(in.readLine()); if (r.code != DictCommandResult.OKAY) throw new DictClientException(r); } public synchronized ArrayList getStrategies() throws IOException, DictClientException { if (strategies == null) fetchStrategies(); return strategies; } private synchronized void fetchStrategies() throws IOException, DictClientException { checkConnection(); out.print("SHOW STRATEGIES\n"); out.flush(); DictCommandResult r = new DictCommandResult(in.readLine()); if (r.code != DictCommandResult.STRATEGIES_PRESENT) throw new DictClientException(r); strategies = new ArrayList<Strategy>(); String line; while (true) { line = in.readLine(); if (line.equals(".")) break; String strategy = line.substring(0, line.indexOf(' ')); String description = line.substring(line.indexOf('"') + 1, line.lastIndexOf('"')); strategies.add(new Strategy(strategy, description)); } r = new DictCommandResult(in.readLine()); if (r.code != DictCommandResult.OKAY) throw new DictClientException(r); } public synchronized ArrayList matchWord(String db, String strategy, String word) throws IOException, DictClientException { checkConnection(); if (debug) System.out.println("DictClient.matchWord(\"" + db + "\", \"" + strategy + "\", \"" + word + "\")"); ArrayList<Match> matches = new ArrayList<Match>(); out.print("MATCH " + db + " " + strategy + " \"" + word + "\"\n"); out.flush(); DictCommandResult r = new DictCommandResult(in.readLine()); if (r.code == DictCommandResult.NO_MATCH) return matches; else if (r.code != DictCommandResult.MATCH_NUM_RECIEVED) throw new DictClientException(r); while (true) { String line = in.readLine(); if (line.equals(".")) break; String rDb = line.substring(0, line.indexOf(' ')); String rWord = line.substring(line.indexOf('"') + 1, line.lastIndexOf('"')); matches.add(new Match(rDb, rWord)); } r = new DictCommandResult(in.readLine()); if (r.code != DictCommandResult.OKAY) { throw new DictClientException(r); } return matches; } public synchronized ArrayList defineWord(String db, String word) throws IOException, DictClientException { checkConnection(); if (debug) System.out.println("DictClient.defineWord(\"" + db + "\", \"" + word + "\")"); ArrayList<Definition> definitions = new ArrayList<Definition>(); out.print("DEFINE " + db + " \"" + word + "\"\n"); out.flush(); DictCommandResult r = new DictCommandResult(in.readLine()); if (r.code == DictCommandResult.NO_MATCH) return definitions; else if (r.code != DictCommandResult.DEFINE_NUM_RECIEVED) throw new DictClientException(r); while (true) { r = new DictCommandResult(in.readLine()); if (r.code == DictCommandResult.OKAY) return definitions; int qoff; String line = r.msg; String rWord = line.substring((qoff = line.indexOf('"') + 1), (qoff = line.indexOf('"', qoff + 1))); String rDb = line.substring(qoff + 2, line.indexOf(' ', qoff + 2)); StringBuilder def = new StringBuilder(); while (true) { line = in.readLine(); if (line.equals(".")) break; def.append(line); def.append("\n"); } definitions.add(new Definition(rDb, rWord, def.toString())); } } }