1 /* 2 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.io.BufferedInputStream; 25 import java.io.BufferedOutputStream; 26 import java.io.DataInputStream; 27 import java.io.DataOutputStream; 28 import java.io.IOException; 29 import java.io.StringWriter; 30 import java.net.Socket; 31 import java.nio.charset.StandardCharsets; 32 import java.nio.file.Files; 33 import java.nio.file.Path; 34 import java.nio.file.Paths; 35 import java.util.Collections; 36 37 public class CustomEditor implements AutoCloseable { 38 39 public static final int SOURCE_CODE = 0; 40 public static final int GET_SOURCE_CODE = 1; 41 public static final int REMOVE_CODE = 2; 42 public static final int GET_FILENAME = 3; 43 44 public static final int EXIT_CODE = -1; 45 public static final int ACCEPT_CODE = -2; 46 public static final int CANCEL_CODE = -3; 47 48 private final Socket socket; 49 private final Path path; 50 private final StringWriter writer; 51 private final String source; 52 53 public CustomEditor(int port, String fileName) throws IOException { 54 this.socket = new Socket((String) null, port); 55 this.path = Paths.get(fileName); 56 this.writer = new StringWriter(); 57 this.source = new String(Files.readAllBytes(path), StandardCharsets.UTF_8); 58 } 59 60 public void loop() throws IOException { 61 DataInputStream input = new DataInputStream(new BufferedInputStream(socket.getInputStream())); 62 DataOutputStream output = new DataOutputStream(new BufferedOutputStream(socket.getOutputStream())); 63 64 while (true) { 65 int cmd = input.readInt(); 66 switch (cmd) { 67 case EXIT_CODE: { 68 Files.write(path, Collections.singletonList(writer.toString())); 69 return; 70 } 71 case GET_SOURCE_CODE: { 72 writeString(output, source); 73 break; 74 } 75 case REMOVE_CODE: { 76 // only for external editor 77 Files.delete(path); 78 break; 79 } 80 case GET_FILENAME: { 81 writeString(output, path.toString()); 82 break; 83 } 84 case CANCEL_CODE: { 85 return; 86 } 87 case ACCEPT_CODE: { 88 Files.write(path, Collections.singletonList(writer.toString())); 89 break; 90 } 91 case SOURCE_CODE: { 92 int length = input.readInt(); 93 byte[] bytes = new byte[length]; 94 input.readFully(bytes); 95 writer.write(new String(bytes, StandardCharsets.UTF_8)); 96 break; 97 } 98 } 99 } 100 } 101 102 private void writeString(DataOutputStream output, String s) throws IOException { 103 byte[] bytes = s.getBytes(StandardCharsets.UTF_8); 104 output.writeInt(bytes.length); 105 output.write(bytes); 106 output.flush(); 107 } 108 109 public static void main(String[] args) throws IOException { 110 if (args.length != 2) { 111 System.err.println("Usage: port file"); 112 System.exit(1); 113 } 114 try (CustomEditor editor = new CustomEditor(Integer.parseInt(args[0]), args[1])) { 115 editor.loop(); 116 } 117 } 118 119 @Override 120 public void close() throws IOException { 121 socket.close(); 122 } 123 }