| /* |
| * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| |
| // Append files to one another without duplicating any lines. |
| |
| import java.io.BufferedReader; |
| import java.io.FileReader; |
| import java.util.HashMap; |
| |
| public class Combine { |
| |
| private static HashMap map = new HashMap(10007); |
| |
| private static void appendFile(String fileName, boolean keep) { |
| try { |
| BufferedReader br = new BufferedReader(new FileReader(fileName)); |
| |
| // Read a line at a time. If the line does not appear in the |
| // hashmap, print it and add it to the hashmap, so that it will |
| // not be repeated. |
| |
| lineLoop: |
| while (true) { |
| String line = br.readLine(); |
| if (line == null) |
| break; |
| if (keep || !map.containsKey(line)) { |
| System.out.println(line); |
| map.put(line,line); |
| } |
| } |
| br.close(); |
| } catch (Exception e) { |
| e.printStackTrace(); |
| System.exit(1); |
| } |
| } |
| |
| |
| public static void main(String[] args) { |
| |
| if (args.length < 2) { |
| System.err.println("Usage: java Combine file1 file2 ..."); |
| System.exit(2); |
| } |
| |
| for (int i = 0; i < args.length; ++i) |
| appendFile(args[i], i == 0); |
| } |
| } |